Diagnosis and management of idiopathic pulmonary fibrosis: French practical guidelines

Idiopathic pulmonary fibrosis (IPF) is the most frequent chronic idiopathic interstitial pneumonia in adults. The management of rare diseases in France has been organised by a national plan for rare diseases, which endorsed a network of expert centres for rare diseases throughout France. This article is an overview of the executive summary of the French guidelines for the management of IPF, an initiative that emanated from the French National Reference Centre and the Network of Regional Competence Centres for Rare Lung Diseases. This review aims at providing pulmonologists with a document that: 1) combines the current available evidence; 2) reviews practical modalities of diagnosis and management of IPF; and 3) is adapted to everyday medical practice. The French practical guidelines result from the combined efforts of a coordination committee, a writing committee and a multidisciplinary review panel, following recommendations from the Haute Autorite de Sante. All recommendations included in this article received at least 90% agreement by the reviewing panel. Herein, we summarise the main conclusions and practical recommendations of the French guidelines.@ERSpublications Practical guidelines for idiopathic pulmonary fibrosis are now available

# Introduction
Idiopathic pulmonary fibrosis (IPF) is a fibroproliferative, irreversible disease of unknown cause. The evolution of IPF is usually progressive, primarily occurring from 60 years of age and is limited to the lungs. It is the most frequent type of chronic idiopathic interstitial pneumonia in adults.
Once considered an orphan disease because no specific treatment with proven efficacy was available, IPF is a rare disease with an estimated prevalence in the USA of between 14 and 28 cases per 100 000 population [bib_ref] Incidence and prevalence of idiopathic pulmonary fibrosis: review of the literature, Nalysnyk [/bib_ref].
The annual estimated incidence in the USA is between 6.8 and 8.8 cases per 100 000 population [bib_ref] Incidence and prevalence of idiopathic pulmonary fibrosis: review of the literature, Nalysnyk [/bib_ref]. No estimate of the epidemiology of IPF has been published for France.
In France, one national reference centre and nine regional competence centres for rare lung diseases have been endorsed to organise the diagnosis and management of IPF within the general framework of two national plans for rare diseases .
Since the publication of international guidelines for the diagnosis and management of IPF in 2011 [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref] , new data have been published regarding, in particular, the efficacy and tolerance of several new treatments proposed to modify the evolution of the disease or alleviate symptoms. The current aim, coordinated by the reference and competence centres, is to provide pulmonologists with a synopsis of the currently available data and to define as clearly as possible, using terms adapted to real-life daily practice, the modalities of diagnosis and patient-centred management of IPF [bib_ref] Patient-centred management in idiopathic pulmonary fibrosis: similar themes in three communication models, Wuyts [/bib_ref].
The present document is an English version of the executive summary and outlines the main conclusions of the French guidelines for the diagnosis and management of IPF.

## Missions of the committees
This article was written by French IPF specialists as a practical overview of the international recommendations for the diagnosis and management of IPF published in 2011 [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref] , in combination with a critical review of the literature published in this field since 2011, including therapeutic trials. This article was produced by a Coordination committee, a Writing committee and a Reviewing committee.
The committees adopted rules that were applicable to the development of good clinical practice based on the method issued by the Haute Autorite de Sante.

## Coordination committee
The Coordination committee submitted the process and validation protocol to the Societe de Pneumologie de Langue Francaise (SPLF), conducted a systematic review of the literature, prepared a first draft of the document intended for the Writing committee, organised the process and validation protocol and monitored its application, and submitted the recommendations validated by the Writing committee and the Reviewing committee to the SPLF.

## Writing committee
The Writing committee assessed the first version of the document prepared by the Coordination committee. Using a three-point scale (I agree, I hesitate or I do not agree) they identified the points to be reviewed, made suggestions about the form and contents of the document, and validated the document to be submitted to the Reviewing committee.

## Reviewing committee
The Reviewing committee comprised three pulmonologists working in a university hospital (excluding the competence centres), three pulmonologists working in a general hospital, three pulmonologists working in private practice, two radiologists with expertise in interstitial lung disease (ILD), and two pathologists who were specialised in thoracic pathology. The committee assessed all the themes and the corresponding recommendations using a scale ranging from 1 (total disagreement) to 9 (total agreement). The vote was conducted electronically and the results were anonymised before analysis. All recommendations submitted to the scrutiny of the Reviewing committee had been approved first by at least 80% of the Writing committee members. The rating of each statement was based on the synthesis of data published in the literature (which was provided together with the questionnaire) and the experience of the reader in the corresponding field. The members of the Reviewing committee could only answer questions for which they felt competent.

## Guidelines development process
The development of the recommendations comprised the following steps. 1) Critical review of the literature published since 2010 in the field of IPF by the Coordination committee. 2) First version written by the Coordination committee. 3) Review of the first version by the Writing committee. 4) Production of a revised version by the Coordination committee. 5) Review and votes by the Writing committee. 6) Rewriting of issues generating an insufficient consensus level by the Coordination committee. 7) Review and votes by the Reviewing committee. 8) Production of a revised version by the Coordination committee. 9) Review by the SPLF Scientific Council. 10) Production of a revised version by the Coordination committee. 11) Submission of the manuscript.
The SPLF Scientific Council gave advice on the relevance, writing and applicability of the recommendations. In order to be validated, recommendations had to be approved by at least 90% of the Reviewing committee members.
The recommendations were formulated as follows. 1) ''It is recommended'' means that the option described is relevant in the majority of patients (e.g. treatment with established efficacy). 2) ''It is proposed'' means that the option described may be relevant in some patients (e.g. treatment with highly probable efficacy). 3) ''It is possible'' means that the option described may be relevant in some patients but that available data do not allow a stronger recommendation (e.g. treatment with uncertain efficacy). 4) ''It is not recommended'' means that the option described is not relevant in the majority of patients (e.g. treatment shown to be inefficient). 5) ''It is recommended not to'' means that the option described should be avoided (e.g. treatment with harmful effects).
The SPLF Scientific Council approved the methods used to develop these recommendations on January 10, 2013, and approved the written recommendations on June 12, 2013. The recommendations were published in December 2013. Herein, we summarise the main conclusions and practical recommendations of the French guidelines.

## Diagnosis of ipf
IPF is a fibroproliferative disease of unknown cause, associated with the histopathological and/or highresolution computed tomography (HRCT) pattern of usual interstitial pneumonia (UIP) [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref]. The presence of a radiological and/or histological UIP pattern is required to establish the diagnosis of IPF. In patients not subjected to video-assisted surgical lung biopsy (SLB), the diagnosis may be made when an ILD is present (with neither extrapulmonary manifestations nor aetiological context) if HRCT shows a (definite) UIP pattern . In patients subjected to video-assisted SLB, the diagnosis is established in the presence of specific combinations of HRCT and SLB aspects showing a UIP pattern [fig_ref] TABLE 2: Diagnosis of idiopathic pulmonary fibrosis [/fig_ref]. In all cases, exclusion of other known causes of ILD (in particular those linked to the environment, notably occupational exposure, drug toxicity or systemic disease) is required to establish the diagnosis of IPF.
IPF primarily occurs between 60 and 70 years of age, and is slightly more predominant in males [bib_ref] Incidence and mortality of idiopathic pulmonary fibrosis and sarcoidosis in the UK, Gribbin [/bib_ref] [bib_ref] What causes cryptogenic fibrosing alveolitis? A case-control study of environmental exposure to..., Scott [/bib_ref] [bib_ref] Pulmonary fibrosis deaths in the United States, 1979-1991. An analysis of multiple-cause..., Mannino [/bib_ref] [bib_ref] High prevalence of abnormal acid gastro-oesophageal reflux in idiopathic pulmonary fibrosis, Raghu [/bib_ref]. There are no specific clinical signs of IPF, which explains why the diagnosis is often established (too) late. The initial clinical presentation consists of progressive exertional dyspnoea combined with dry cough; bibasilar inspiratory crackles (velcro crackles) are constant and appear early in the disease [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref] [bib_ref] Idiopathic pulmonary fibrosis: impact of oxygen and colchicine, prednisone, or no therapy..., Douglas [/bib_ref] [bib_ref] Predicting survival in idiopathic pulmonary fibrosis: scoring system and survival model, King [/bib_ref] [bib_ref] Velcro crackles: the key for early diagnosis of idiopathic pulmonary fibrosis?, Cottin [/bib_ref] [bib_ref] Fundamentals of lung auscultation, Bohadana [/bib_ref]. Finger clubbing is present in ,50% of cases. Weight loss and alteration of the general status are uncommon. Cyanosis and signs of right ventricular failure only occur in the advanced stages with respiratory insufficiency. The disease progresses towards chronic restrictive respiratory failure and death. Precapillary pulmonary hypertension is often present in advanced stages, in particular if emphysema is associated with IPF.
Question 1: What main causes of diffuse interstitial pneumonia should be clinically investigated in patients considered to potentially have IPF?

## Recommendation
It is recommended that a cause of ILD, including exposure to pharmaceutical agents, an inhaled organic antigen or mineral particles, or connective tissue disease and cancer, be clinically investigated in patients for whom a diagnosis of IPF is considered.

## Comment
The diagnosis of IPF requires the exclusion of other forms of ILD, including interstitial pneumonias either 1) with an identified cause: hypersensitivity pneumonitis due to inhalation of organic antigen(s), toxicity of pharmaceutical agents, pneumoconiosis caused by a mineral agent (silica and asbestos among others), primary or secondary cancer, or traumatic or haemodynamic pulmonary oedema; or 2) with no identified cause but occurring in a specific context of connective tissue disease (especially rheumatoid arthritis, Sjogren's syndrome and systemic sclerosis), sarcoidosis, a well-defined infiltrative lung disease such as lymphangioleiomyomatosis, pulmonary Langerhans' cell granulomatosis or idiopathic chronic eosinophilic pneumonia, or any other well identified ILD.
Question 2: What biological work-up should be performed in patients considered to have IPF?

## Recommendation
It is recommended that biological signs of connective tissue disease be investigated if the diagnosis of IPF is considered.
It is proposed that a biological work-up be performed, including determinations of the following. 1) Differential blood cell count, C-reactive protein, serum creatinine, transaminases, c-glutamyltransferase and alkaline phosphatases. 2) Anti-nuclear antibodies, anti-citrullinated cyclic peptide antibodies and rheumatoid factor. 3) And depending on the clinical picture or if anti-nuclear antibodies, antibodies specific to Sjogren's syndrome (anti-SSA, anti-SSB), systemic sclerosis antibodies (anti-centromeres, antitopoisomerase-1 and anti-U3RNP), anti-synthetase antibodies, anti-thyroid antibodies, creatine phosphokinase and serum protein electrophoresis are detected.

## Comment
DIP is associated with a radiological and/or pathological pattern compatible with UIP [bib_ref] Prognosis of fibrotic interstitial pneumonia: idiopathic versus collagen vascular disease-related subtypes, Park [/bib_ref] , and may be the first clinical manifestation of a connective tissue disease [bib_ref] Interstitial lung disease: are we missing formes frustes of connective tissue disease?, Cottin [/bib_ref]. Therefore, if the diagnosis of IPF is considered it is necessary to systematically look at extrapulmonary signs and biological markers in order to eliminate a connective tissue disease. If signs, symptoms or biological abnormalities suggesting a connective tissue disease occur during the course of the disease, the diagnosis of IPF should be challenged. Biological markers of an inflammatory syndrome or an extrapulmonary disorder should also be measured. Detection of antineutrophil cytoplasmic antibodies has been proposed [bib_ref] ANCA-associated lung fibrosis: analysis of 17 patients, Foulon [/bib_ref]. Precipitin detection is justified in the case of exposure to organic antigens or if hypersensitivity pneumonitis is suspected. The investigation of infectious agents, in particular by bronchoalveolar lavage (BAL), may be justified. Examinations that aim to identify a lymphoproliferative disorder (protein electrophoresis, immuno-electrophoresis, urinary immunofixation or cryoglobulinaemia) are justified if an ILD other than IPF is suspected.

## Comment
In IPF patients, BAL shows hypercellularity with an increased number of neutrophils and, frequently, an accompanying lower increase of the number of eosinophils. An increased number of lymphocytes evoke a diagnosis other than IPF [bib_ref] An official American Thoracic Society clinical practice guideline: the clinical utility of..., Meyer [/bib_ref] , including chronic hypersensitivity pneumonitis [bib_ref] Significance of bronchoalveolar lavage for the diagnosis of idiopathic pulmonary fibrosis, Ohshimo [/bib_ref] , nonspecific interstitial pneumonia (suggesting connective tissue disease) or sarcoidosis. BAL contributes to the diagnosis primarily if the radiological examination does not show a typical UIP pattern, in particular if chronic hypersensitivity pneumonitis is suspected [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref]. A predominance of lymphocytes .30% does not favour IPF [bib_ref] Significance of bronchoalveolar lavage for the diagnosis of idiopathic pulmonary fibrosis, Ohshimo [/bib_ref].
Question 4: When should genetic testing be performed in patients suspected of having IPF?

## Recommendation
If a diagnosis of IPF is suspected, it is recommended that tests are systematically performed during the medical interview to identify the presence of other causes of ILD within the family, and to search for clinical and biological signs suggesting a genetic cause (hepatic, cutaneous, mucosal and haematological abnormalities).
It is proposed that patients presenting with IPF in a familial context be referred to an outpatient clinic specialising in genetics to establish a pedigree and propose genetic molecular analysis primarily targeting, with the currently available of knowledge, the telomerase complex genes and the surfactant protein-C genes.

## Comment
Familial forms of IPF affecting ,5% of patients have been reported [bib_ref] Familial idiopathic pulmonary fibrosis. Evidence of lung inflammation in unaffected family members, Bitterman [/bib_ref] [bib_ref] Adult familial cryptogenic fibrosing alveolitis in the United Kingdom, Marshall [/bib_ref] [bib_ref] Nationwide prevalence of sporadic and familial idiopathic pulmonary fibrosis: evidence of founder..., Hodgson [/bib_ref] [bib_ref] Familial idiopathic pulmonary fibrosis: clinical features and outcome, Lee [/bib_ref]. The probability of a genetic cause seems to be higher in younger individuals (in particular those aged ,50 years).
Most frequently, the mode of genetic transmission of IPF in those familial cases is an autosomal dominant pattern of inheritance with variable penetrance [bib_ref] Adult familial cryptogenic fibrosing alveolitis in the United Kingdom, Marshall [/bib_ref] [bib_ref] Nationwide prevalence of sporadic and familial idiopathic pulmonary fibrosis: evidence of founder..., Hodgson [/bib_ref] [bib_ref] Clinical and pathologic features of familial interstitial pneumonia, Steele [/bib_ref] [bib_ref] Early interstitial lung disease in familial pulmonary fibrosis, Rosas [/bib_ref] [bib_ref] Genetic studies in familial fibrosing alveolitis. Possible linkage with immunoglobulin allotypes (Gm), Musk [/bib_ref]. A congenital form of dyskeratosis, characterised by a mutation of the telomerase complex genes (TERT and TERC), may be suggested by clinical and biological abnormalities, including macrocytosis, refractory anaemia due to erythroblastopenia, cryptogenic hepatic cirrhosis, abnormal cutaneous pigmentation, mucosal abnormalities such as leukoplakia of the tongue margin, or leukotrichia (premature greying of hair) [bib_ref] Telomere biology and telomere diseases: implications for practice and research, Young [/bib_ref]. Recommendation It is recommended that forced vital capacity (FVC) and diffusing capacity of the lung for carbon monoxide (DLCO) should be assessed in patients being tested for IPF. It is proposed that total lung capacity, resting arterial blood gas at room air, 6-min walk test (6MWT) distance and percutaneous oxygen saturation should also be assessed.

## Comment
Pulmonary function tests performed at rest in IPF patients show several abnormalities: 1) pulmonary function restrictive pattern (decreased FVC and total lung capacity); 2) early decrease of DLCO and transfer coefficient of the lung for carbon monoxide; and 3) usually, normal arterial blood gas values at rest or hypocapnia (increased alveolar-arterial oxygen tension difference).
In addition, pulmonary function tests performed at exercise show a reduced exercise capacity, which may be assessed by measuring: exercise hypoxaemia (even if not present at rest); the distance walked during a 6MWT; the decrease of percutaneous oxygen saturation during exercise, notably during the 6MWT; and the decrease of maximal consumption of oxygen uptake and maximal power workload during exercise.

## Comment
HRCT of the chest is mandatory for the diagnosis of IPF. In ,50% of cases, HRCT shows a definite UIP pattern with honeycombing [fig_ref] FIGURE 2: High-resolution computed tomography scan demonstrating a typical example of usual interstitial pneumonia... [/fig_ref] [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref] [bib_ref] Pneumopathies interstitielles diffuses idiopathiques. Classification de Consensus International Multidisciplinaire de l, Cottin [/bib_ref] , which is sufficient for the diagnosis of IPF if the analysis is performed by a team of pulmonologists experienced in the field of IPF in a compatible clinical context. In other cases, the imaging features are not characteristic [fig_ref] FIGURE 3 a: b [/fig_ref] and video-assisted SLB is required to establish the diagnosis. In some cases, HRCT findings may be inconsistent with a UIP pattern . [fig_ref] TABLE 2: Diagnosis of idiopathic pulmonary fibrosis [/fig_ref] indicates the criteria used to define HRCT findings as definite or possible UIP. Honeycombing is required to consider a definite UIP pattern on HRCT. [fig_ref] TABLE 3: Chest high-resolution computed tomography methodsMandatoryNo injection of contrast medium Inspiratory apnoea slices... [/fig_ref] indicates how HRCT should be performed.

## Question 7:
In what patients should SLB be considered to establish the diagnosis of IPF?

## Recommendation
It is recommended that video-assisted SLB be considered in patients for whom the diagnosis of IPF is suspected, if a definite UIP pattern is not present on HRCT. The decision to perform a biopsy is taken during a multidisciplinary team discussion after careful evaluation of the operative risk. The potential risk associated with biopsy must be taken into account, especially due to the age of the patient, the presence of comorbidities, and the severity and progression of interstitial pneumonia.

## Comment
If the imaging findings are not typical of a UIP pattern, a definite diagnosis of IPF requires a histological UIP pattern to be demonstrated on video-assisted SLB (tables 4 and 5) and is based on the combination of radiological and histological findings [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref].
In some cases, HRCT only shows a possible UIP pattern but video-assisted SLB is not performed (because of contraindications or possible risk, or biopsy is not proposed or is declined by the patient). It is then impossible to establish the diagnosis of IPF according to the international recommendation criteria [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref].
Question 8: What is the role of multidisciplinary team discussion in the diagnosis of IPF and how is it conducted?

## Recommendation
During a multidisciplinary discussion involving pulmonologists, radiologists and pathologists experienced in the field of interstitial pneumonias, it is recommended that a definite diagnosis of IPF integrates clinical assessment, computed tomography features and, if available, pathological features .
It is recommended that complex cases be referred to expert centres (reference or competence centres), or to pulmonology departments experienced in ILDs.

## Comment
The diagnosis of IPF results from the combination of clinical, radiological, biological, respiratory function and, if available, pathological features and is established during multidisciplinary discussion. Ideally, the multidisciplinary discussion takes place in an expert or specialised centre, i.e. the reference centre or one of the competence centres for rare lung diseases, or a pulmonology department experienced in ILDs.
Question 9: How should prognosis be assessed in IPF patients?

## Recommendation
It is recommended that prognosis be assessed in IPF patients at the time of diagnosis based on: severity of dyspnoea; results of pulmonary function tests (FVC and DLCO); percutaneous oxygen saturation at the end of the 6MWT; extent of honeycombing on HRCT; signs of pulmonary hypertension at echocardiography; and using a score. Prognosis should also be assessed in IPF patients during follow-up based on: progression of symptoms; FVC and DLCO; fibrosis on HRCT; and, where applicable, on signs of pulmonary hypertension at echocardiography.

## Comment
The following factors have been associated with an increased risk of death in IPF patients [bib_ref] Clinical course and prediction of survival in idiopathic pulmonary fibrosis, Ley [/bib_ref]. 1) Older age and male sex. 2) Early signs and symptoms: including severity of dyspnoea, DLCO ,35-40% predicted, percutaneous oxygen saturation ,88% during a 6MWT at room air, extent of honeycombing on HRCT, including worsening of dyspnoea, .5% (absolute value) or 10% (absolute or relative value) decrease in FVC over 6 months [bib_ref] Forced vital capacity in patients with idiopathic pulmonary fibrosis: test properties and..., Bois [/bib_ref] , .15% (absolute or relative value) decrease in DLCO over 6 months, .50 m decrease in distance walked during the 6MWT [bib_ref] Six-minute-walk test in idiopathic pulmonary fibrosis: test validation and minimal clinically important..., Bois [/bib_ref] , and worsening of fibrosis on HRCT.
[formula] [R] [L] [R] [L] a) b) [/formula]
The survival estimates at 1, 2 and 3 years can be predicted using the GAP (gender, age, physiology) score based on age, sex, FVC and DLCO (www.acponline.org/journals/annals/extras/gap/) [bib_ref] Ascertainment of individual risk of mortality for patients with idiopathic pulmonary fibrosis, Bois [/bib_ref] [bib_ref] A multidimensional index and staging system for idiopathic pulmonary fibrosis, Ley [/bib_ref].

## Treatment of ipf
What medical treatments have been proposed to treat IPF? Prednisone, azathioprine and N-acetylcysteine triple therapy Recommendation It is recommended not to initiate a triple therapy with prednisone, azathioprine and N-acetylcysteine (NAC) in patients definitely diagnosed with IPF.

## Comment
In the randomised, placebo-controlled IFIGENIA(Idiopathic Pulmonary Fibrosis International Group Exploring N-Acetylcysteine I Annual) trial [bib_ref] IFIGENIA: effects of N-acetylcysteine (NAC) on primary end points VC and DL,CO, Demedts [/bib_ref] , an antioxidant dose (1.8 g?day -1 ) of NAC reduced the decrease of FVC and DLCO compared to placebo in a population of IPF patients who were also receiving a combination of prednisone and azathioprine. This trial was not designed to assess the benefits of triple therapy compared to placebo.
[formula] [R] [L] [R] [L] a) b) FIGURE 4 [/formula]
High-resolution computed tomography scans demonstrating patterns not consistent with usual interstitial pneumonia. a) Prominent and diffuse ground-glass attenuation with traction bronchiectasis in a patient with idiopathic nonspecific interstitial pneumonia. b) Ground-glass attenuation with mosaic distribution in a patient with hypersensitivity pneumonitis. The PANTHER (Prednisolone, Azathioprine and NAC: a study that evaluates response in IPF) trial assessed the efficacy of NAC antioxidant treatment in mild-to-moderate IPF [bib_ref] Prednisone, azathioprine, and N-acetylcysteine for pulmonary fibrosis, Raghu [/bib_ref]. The trial initially comprised three arms with similar sample sizes (triple therapy: azathioprine + prednisone + NAC versus NAC versus placebo), the main outcome being decrease in FVC at 60 weeks. The triple therapy arm was prematurely discontinued at 6 months after inclusion of 236 patients because of increased risks of all-cause mortality (p50.01) and unscheduled hospitalisation (p,0.001) compared to placebo.

## Nac monotherapy recommendation
It is possible to prescribe NAC treatment to some patients with a definite diagnosis of IPF, taking into account the benefit/risk ratio and the patient's preferences, if treatment with an approved drug is not indicated after having considered participation in a therapeutic clinical trial.

## Comment
The IFIGENIA trial [bib_ref] IFIGENIA: effects of N-acetylcysteine (NAC) on primary end points VC and DL,CO, Demedts [/bib_ref] did not assess the benefits of NAC monotherapy compared to placebo. Results of the ongoing PANTHER trial [bib_ref] Prednisone, azathioprine, and N-acetylcysteine for pulmonary fibrosis, Raghu [/bib_ref] , which currently comprises the NAC and placebo arms, will be released in 2014. Pending the results of ongoing clinical trials, monotherapy treatment with NAC may be considered on

## Indication
Absence of HRCT features sufficient to diagnose IPF # Setting Surgical centre experienced in the management of interstitial lung diseases and in performing video-assisted surgical lung biopsies Technique Video-assisted surgery whenever possible (excluding transbronchial biopsies) " Sampling In depth, in several lobes + , avoiding the extremity of the lingula and middle lobe HRCT: high-resolution computed tomography. # : theoretical indication, to be balanced during multidisciplinary team discussion with risk associated with biopsy, age and possible comorbid conditions, and to be discussed with the patient; " : to collect samples of an adequate size; + : lesions may differ between the lobes. : can be associated with acute exacerbation of idiopathic pulmonary fibrosis; " : an isolated or occasional granuloma and/or a mild component of organising pneumonia pattern may rarely coexist in lung biopsies with an otherwise UIP pattern; + : this scenario usually represents end-stage fibrotic lung disease where honeycombed segments have been sampled but where a UIP pattern might be present in other areas. Such areas are usually represented by overt honeycombing on high-resolution computed tomography (HRCT) and can be avoided by pre-operative targeting of biopsy sites away from these areas using HRCT. Reproduced from [bib_ref] An Official ATS/ERS/JRS/ALAT statement: idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and..., Raghu [/bib_ref] with permission from the publisher. an individual basis. NAC has not been approved for the treatment of IPF and may not be reimbursed by health insurance systems.

## Corticosteroid therapy recommendation
It is recommended not to use corticosteroid therapy (with or without immunomodulator therapy) in patients with a definite diagnosis of IPF, except in the context of acute exacerbation of the disease.

## Comment
No survival benefit has been demonstrated in patients treated with corticosteroids in controlled trials [bib_ref] Idiopathic pulmonary fibrosis: impact of oxygen and colchicine, prednisone, or no therapy..., Douglas [/bib_ref] [bib_ref] Hospital-based historical cohort study of 234 histologically proven Japanese patients with IPF, Nagai [/bib_ref]. Corticosteroid monotherapy is associated with substantial long-term morbidity [bib_ref] Idiopathic pulmonary fibrosis: predicting response to therapy and survival, Gay [/bib_ref]. Due to methodological biases [bib_ref] Diffuse interstitial pneumonitis. Clinicopathologic correlations in 20 patients treated with prednisone/azathioprine, Winterbauer [/bib_ref] [bib_ref] Azathioprine combined with prednisone in the treatment of idiopathic pulmonary fibrosis: a..., Raghu [/bib_ref] [bib_ref] Randomised controlled trial comparing prednisolone alone with cyclophosphamide and low dose prednisolone..., Johnson [/bib_ref] or conflicting results [bib_ref] Combined corticosteroid and cyclophosphamide therapy does not alter survival in idiopathic pulmonary..., Collard [/bib_ref] [bib_ref] Survival in idiopathic pulmonary fibrosis-cytotoxic agents compared to corticosteroids, Pereira [/bib_ref] of studies assessing the efficacy of combination corticosteroid and immunomodulator therapy (e.g. azathioprine or cyclophosphamide) on patient's survival, this combination cannot be recommended in the treatment of IPF. Oral corticosteroid therapy up to 10 mg of prednisone per day is sometimes proposed to alleviate incapacitating cough [bib_ref] A study of the cough reflex in idiopathic pulmonary fibrosis, Hope-Gill [/bib_ref]. High-dose corticosteroid therapy is proposed to treat patients with acute exacerbation of IPF.

## Anticoagulation therapy recommendation
It is recommended not to prescribe oral anti-vitamin K anticoagulant agents to treat IPF. While specific data are lacking, oral anti-vitamin K agents are not contraindicated in patients with IPF if this treatment is indicated for other reasons (especially for cardiovascular indications).

## Comment
A Japanese trial conducted in patients with IPF compared corticosteroid monotherapy to combination corticosteroid and anticoagulant therapy (long-term warfarin treatment; unfractionated or low-molecular weight heparin in hospitalised patients) [bib_ref] Anticoagulant therapy for idiopathic pulmonary fibrosis, Kubo [/bib_ref]. Results suggested a survival benefit associated with the combination therapy but the study had major methodological flaws. A more recent and methodologically sound trial comparing warfarin to placebo was prematurely discontinued because of increased mortality (p50.005) and increased prevalence of adverse events in the warfarin group, without survival benefit [bib_ref] A placebo-controlled randomized trial of warfarin in idiopathic pulmonary fibrosis, Noth [/bib_ref].

## Colchicine, cyclosporine a, interferon-c-1b and etanercept recommendation
It is not recommended to prescribe treatment with colchicine, cyclosporine A, interferon-c-1b or etanercept in patients definitely diagnosed with IPF.

## Comment
Several prospective clinical trials comparing colchicine to various therapeutic regimens did not demonstrate any clinical efficacy of colchicine in IPF [bib_ref] Colchicine, cyclophosphamide and prednisone in the treatment of mildmoderate idiopathic pulmonary fibrosis:..., Fiorucci [/bib_ref] [bib_ref] Long-term clinical effects of interferon gamma-1b and colchicine in idiopathic pulmonary fibrosis, Antoniou [/bib_ref] [bib_ref] Colchicine versus prednisone in the treatment of idiopathic pulmonary fibrosis. A randomized..., Douglas [/bib_ref]. A retrospective study conducted in 487 patients with IPF showed no effect of colchicine on survival [bib_ref] Idiopathic pulmonary fibrosis: impact of oxygen and colchicine, prednisone, or no therapy..., Douglas [/bib_ref].
In two studies conducted in small groups of patients with IPF, who had received lung transplantation and whose immunosuppressive treatment included cyclosporine, the disease progressed in the nontransplanted lung [bib_ref] Progression of fibrosis in usual interstitial pneumonia: serial evaluation of the native..., Grgic [/bib_ref] [bib_ref] Progression of idiopathic pulmonary fibrosis in native lungs after single lung transplantation, Wahidi [/bib_ref].
In two randomised controlled trials, interferon-c-1b had no effect on disease progression [bib_ref] A placebo-controlled trial of interferon-c-1b in patients with idiopathic pulmonary fibrosis, Raghu [/bib_ref] and overall survival [bib_ref] Effect of interferon-c-1b on survival in patients with idiopathic pulmonary fibrosis (INSPIRE):..., King [/bib_ref].
In a randomised controlled trial of etanercept conducted in patients with IPF, no difference was found regarding the primary end-point (change in FVC at 48 weeks) [bib_ref] Treatment of idiopathic pulmonary fibrosis with etanercept: an exploratory, placebo-controlled trial, Raghu [/bib_ref].

## Endothelin-1 receptor antagonists recommendation
It is not recommended to prescribe treatment with bosentan or macitentan in patients definitely diagnosed with IPF. It is recommended not to prescribe treatment with ambrisentan in patients definitely diagnosed with IPF.

## Comment
In a phase II randomised controlled trial of bosentan, an antagonist of endothelin-1 receptors A and B (ET A and ET B , respectively), there was no improvement in the primary end-point (modified 6MWT) [bib_ref] BUILD-1: a randomized placebo-controlled trial of bosentan in idiopathic pulmonary fibrosis, King [/bib_ref]. BUILD (Bosentan Use in Interstitial Lung Disease)-3, conducted in patients with IPF confirmed by lung biopsy [bib_ref] BUILD-3: a randomized, controlled trial of bosentan in idiopathic pulmonary fibrosis, King [/bib_ref] , did not show any improvement in the primary end-point (time to IPF worsening or death), or in quality of life and dyspnoea in the bosentan group. The primary end-point (change in FVC) was also not reached in the MUSIC (Macitentan Use in an Idiopathic Pulmonary Fibrosis Clinical) trial that evaluated macitentan [bib_ref] Efficacy and safety of macitentan in idiopathic pulmonary fibrosis: results of a..., Raghu [/bib_ref] , another antagonist of ET A and ET B . In ARTEMIS-IPF [bib_ref] ARTEMIS-IPF: a placebo-controlled trial of ambrisentan in idiopathic pulmonary fibrosis, Raghu [/bib_ref] , ambrisentan, an ET A antagonist, had detrimental effects on the primary end-point (time to death or worsening of pulmonary function) and was associated with an increased rate of hospitalisations for respiratory complications. Ambrisentan is currently contraindicated in IPF, including IPF with severe pulmonary hypertension.

## Etanercept recommendation
It is not recommended to prescribe treatment with etanercept in patients definitely diagnosed with IPF.

## Pirfenidone recommendation
It is currently recommended to treat patients definitely diagnosed with mild-to-moderate IPF (defined as FVC o50% pred and DLCO o35% pred) with pirfenidone. This treatment should be initiated and supervised by a physician experienced in the diagnosis and management of IPF, and requires regular monitoring of clinical tolerance and liver enzymes. The patient must not smoke during pirfenidone treatment and patients should be warned against UV exposure.

## Comment
A pooled analysis of two phase III studies (006/Capacity 1 and 004/Capacity 2) conducted in patients with mild-to-moderate IPF showed a significant reduction in FVC decline at week 72 in patients treated with pirfenidone [bib_ref] Pirfenidone in patients with idiopathic pulmonary fibrosis (CAPACITY): two randomised trials, Noble [/bib_ref]. Disease progression (defined as a o10% decrease in FVC absolute value, a o15% decrease in DLCO, or death) and decline in 6MWT performance were also reduced. In a phase III study conducted in Japan [bib_ref] Pirfenidone in idiopathic pulmonary fibrosis, Taniguchi [/bib_ref] , pirfenidone (1800 mg?day -1 ) significantly reduced FVC decline compared to placebo. Another phase III trial is ongoing in the USA (www.clinicaltrials.gov; identifier NCT01366209).
Pirfenidone was granted European marketing authorisation in 2011, and was marketed in France in 2012 for the treatment of patients with a clinically and radiologically confirmed diagnosis of mild-to-moderate IPF (FVC o50% pred and DLCO o35% pred). Pirfenidone should be initiated and supervised by specialist physicians experienced in the diagnosis and management of IPF.
Pirfenidone should not be administered to patients treated with fluvoxamine and patients with severe hepatic or renal impairment. The most commonly reported adverse reactions with pirfenidone were nausea, rash, fatigue, diarrhoea, dyspepsia, photosensitivity reaction and weight loss [bib_ref] Pirfenidone in patients with idiopathic pulmonary fibrosis (CAPACITY): two randomised trials, Noble [/bib_ref]. Pirfenidone may also induce elevations in liver enzymes. Liver function tests should be performed prior to the initiation of treatment with pirfenidone, and subsequently at monthly intervals for the first 6 months and every 3 months thereafter.
Smoking has the potential to increase the activity of enzymes involved in pirfenidone metabolism and should be discontinued prior to and during treatment with pirfenidone. Concomitant use of omeprazole may theoretically result in changes in pirfenidone pharmacokinetics and should be avoided.

## Should ipf patients be vaccinated against influenza and pneumococcal infections? recommendation
It is recommended that annual influenza vaccination and anti-pneumococcal vaccination be performed in patients definitely diagnosed with IPF.

## Comment
Although no specific studies of these vaccinations have been conducted in the context of IPF, it is very likely that, like other patients suffering from chronic respiratory diseases, IPF patients are exposed to a high risk if they develop a pneumococcal infection or influenza. Anti-pneumococcal vaccinations may be performed using the polysaccharide pneumococcal vaccine.

## Should ipf patients receive supplemental oxygen therapy? recommendation
It is recommended to use long-term oxygen therapy in patients definitely diagnosed with IPF and with severe hypoxaemia at rest (severe chronic respiratory failure).

## Comment
Indirect evidence of benefits of oxygen therapy has been suggested by studies conducted in patients with other lung diseases and hypoxaemia. Two randomised controlled trials have reported a survival benefit in patients with chronic obstructive lung disease receiving long-term oxygen therapy. Supplemental oxygen therapy is usually indicated in severe chronic respiratory failure (arterial oxygen tension (PaO 2 ) f55 mmHg (7.3 kPa)), i.e. arterial oxygen saturation f88% measured at rest in stable conditions on two separate occasions or PaO 2 55-60 mmHg (7.3-8.0 kPa) if at least one of the following criterion is present: haematocrit .55%, signs of pulmonary hypertension and documented right heart failure. Long-term oxygen therapy is commonly used in patients with PaO 2 f55-60 mmHg (7.3-8.0 kPa) measured at rest in stable conditions on two separate occasions.

## Should ipf patients receive respiratory rehabilitation? recommendation
It is proposed that a respiratory rehabilitation programme should be initiated in patients definitely diagnosed with IPF in whom limitation of exercise capacity results in significant impairment.

## Comment
Several studies have reported improvement in walking distance, symptoms or quality of life in IPF patients following a respiratory rehabilitation programme [bib_ref] Short term improvement in exercise capacity and symptoms following exercise training in..., Holland [/bib_ref] [bib_ref] Effects of pulmonary rehabilitation in patients with idiopathic pulmonary fibrosis, Nishiyama [/bib_ref]. Respiratory rehabilitation programmes may include exercise training, smoking cessation, psychosocial assistance and supportive care. Rehabilitation may not be feasible in patients with advanced disease.

## What is the indication for lung transplantation in ipf patients? recommendation
It is recommended to consider lung transplantation in all patients definitely diagnosed with IPF aged ,65 years if the disease is severe or worsening. It is recommended that the patient is given information about lung transplantation early in the course of the disease. Early assessment of the patient in a lung transplantation centre is advised.

## Comment
Lung transplantation improves survival in patients with advanced stage IPF [bib_ref] Lung transplantation for idiopathic pulmonary fibrosis, Mason [/bib_ref] [bib_ref] Lung transplantation in pulmonary fibrosis: challenging early outcomes counterbalanced by surprisingly good..., Keating [/bib_ref] [bib_ref] Survival benefit of lung transplantation for patients with idiopathic pulmonary fibrosis, Thabut [/bib_ref]. International recommendations specify that transplantation should be considered in patients aged ,65 years if DLCO is ,39% pred and FVC has decreased by o10% over 6 months of follow-up [bib_ref] International guidelines for the selection of lung transplant candidates: 2006 update -a..., Orens [/bib_ref]. The (physiological) age limit of ,65 years is relative and depends on local practice; comorbid conditions should be taken into account.
What are the diagnostic criteria of acute exacerbation of IPF? Recommendation It is recommended to diagnose acute exacerbation of IPF in the case of recent worsening of dyspnoea (,30 days) associated with additional lung opacities on imaging, after other possible causes of respiratory function worsening have been ruled out (i.e. infection, pulmonary embolism and left heart failure).

## Comment
Acute exacerbation of IPF is characterised by acute (,30 days) worsening of dyspnoea with no identified cause (e.g. infection, pulmonary embolism, left heart failure or cardiac arrhythmia) in a patient definitely diagnosed with IPF. HRCT shows new opacities in addition to pre-existing abnormalities, in particular ground-glass opacities. Worsening of hypoxaemia is common (o10 mmHg decrease of PaO 2 ). Videoassisted SLB is usually considered too hazardous and is not performed in this context.

## Which treatments can be suggested to patients with acute exacerbation of ipf? recommendation
It is proposed to use high-dose corticosteroids to treat acute exacerbations of IPF. It is possible to use intravenous cyclophosphamide to treat acute exacerbations of IPF. There are insufficient data regarding the use of low-molecular weight heparin to treat acute exacerbations of IPF.

## Comment
Although no controlled trials have assessed their efficacy in this indication, high-dose corticosteroids are commonly prescribed to treat exacerbations of IPF [bib_ref] Idiopathic pulmonary fibrosis: increased survival with ''gastroesophageal reflux therapy'': fact or fallacy?, Raghu [/bib_ref]. Some observations have suggested that immunosuppressive agents might be beneficial. Cyclosporine A has also been used, but without convincing results. A benefit of intravenous cyclophosphamide has been suggested previously [bib_ref] Exacerbations of idiopathic pulmonary fibrosis treated with corticosteroids and cyclophosphamide pulses, Morawiec [/bib_ref].
Low-molecular weight heparins have not demonstrated any benefits in acute exacerbations of IPF, but this treatment is sometimes used. As a trial comparing warfarin to placebo was prematurely discontinued because of increased mortality and increased prevalence of adverse events in the warfarin group, without apparent survival benefit [bib_ref] A placebo-controlled randomized trial of warfarin in idiopathic pulmonary fibrosis, Noth [/bib_ref] , long-term oral anticoagulant therapy is not recommended in IPF (see previous section). Wide-spectrum antibiotics may be used when infection has not been definitely ruled out. Anticoagulant therapy may be prescribed in the case of acute worsening of symptoms or if thromboembolic venous disease is suspected.
What is the role of invasive and noninvasive ventilation in the management of IPF? Recommendation It is not recommended to use invasive ventilation in patients definitely diagnosed with IPF and acute or chronic respiratory failure. It is possible to use invasive or noninvasive ventilation in a minority of patients with IPF and acute respiratory failure; in particular, if criteria for emergency lung transplantation are met, if exacerbation is the first manifestation of IPF, or in case of acute infection or reversible cause.

## Comment
Given the high mortality associated with mechanical ventilation in IPF [bib_ref] Outcome of patients with idiopathic pulmonary fibrosis admitted to the ICU for..., Blivet [/bib_ref] [bib_ref] Acute exacerbation of idiopathic pulmonary fibrosis: frequency and clinical features, Kim [/bib_ref] [bib_ref] Outcome of patients with idiopathic pulmonary fibrosis admitted to the intensive care..., Saydain [/bib_ref] [bib_ref] Lung and chest wall mechanics in ventilated patients with end stage idiopathic..., Nava [/bib_ref] [bib_ref] Prognosis of patients with advanced idiopathic pulmonary fibrosis requiring mechanical ventilation for..., Stern [/bib_ref] [bib_ref] Outcome of patients admitted to the intensive care unit for acute exacerbation..., Al-Hameed [/bib_ref] [bib_ref] Outcome of mechanical ventilation for acute respiratory failure in patients with pulmonary..., Fumeaux [/bib_ref] [bib_ref] Mechanical ventilation in patients with end-stage idiopathic pulmonary fibrosis, Mollica [/bib_ref] [bib_ref] Outcomes of patients admitted to the intensive care unit with idiopathic pulmonary..., Rangappa [/bib_ref] , this therapy should only be used after discussion with the patients and their caregivers (ideally, during a previous visit) regarding goals of care, in particular reduction of unnecessary suffering. Intensive care is justified as a bridge to lung transplantation or if a reversible cause of worsening has been identified [bib_ref] Fibrose pulmonaire: dans quels cas et sur quels criteres envisager une admission..., Mullier [/bib_ref].
Data on noninvasive ventilation in IPF are scarce. A retrospective study in which some patients with acute exacerbation of IPF were included suggests that, in this context, noninvasive ventilation may be preferred to invasive ventilation without increasing mortality [bib_ref] Noninvasive ventilation in acute exacerbation of idiopathic pulmonary fibrosis, Yokoyama [/bib_ref].

## Should ipf patients be investigated for pulmonary hypertension, if so how? recommendation
It is proposed that echocardiography be performed during the IPF diagnostic procedure and then annually to detect pulmonary hypertension in patients with IPF. It is proposed that right heart catheterisation be performed to diagnose pulmonary hypertension in patients definitely diagnosed with IPF: 1) prior to lung transplantation; 2) in cases of clinical deterioration, limitation of exercise capacity, decrease of DLCO (especially if DLCO is ,40% pred) and/or hypoxaemia disproportionate with regard to the restrictive ventilatory defect (in particular if emphysema is present); 3) if an accurate evaluation of prognosis is deemed essential; 4) if severe precapillary pulmonary hypertension is suspected at echocardiography (tricuspid regurgitation flow .3.5 m?s -1 ) and to discuss possible off-label treatment of pulmonary hypertension; and 5) if left ventricular disease with preserved systolic function is suspected.

## Comment
Precapillary pulmonary hypertension (mean pulmonary artery pressure (Ppa) o25 mmHg and pulmonary artery wedge pressure f15 mmHg) is present in ,10% of patients with IPF at the time of diagnosis, and 30-45% during evaluation prior to lung transplantation [bib_ref] Pulmonary hypertension in patients with idiopathic pulmonary fibrosis, Nathan [/bib_ref]. Severe pulmonary hypertension (mean Ppa o35-40 mmHg) [bib_ref] Pulmonary hypertension in chronic lung diseases, Seeger [/bib_ref] is present in 2-9% of patients with IPF [bib_ref] Pulmonary hypertension in patients with pulmonary fibrosis awaiting lung transplant, Shorr [/bib_ref] [bib_ref] Prevalence and outcomes of pulmonary arterial hypertension in advanced idiopathic pulmonary fibrosis, Lettieri [/bib_ref]. Precapillary pulmonary hypertension is associated with increased mortality [bib_ref] Prevalence and outcomes of pulmonary arterial hypertension in advanced idiopathic pulmonary fibrosis, Lettieri [/bib_ref] , dyspnoea and hypoxaemia, decreased exercise capacity and DLCO, and risk of acute exacerbation [bib_ref] Acute exacerbations and pulmonary hypertension in advanced idiopathic pulmonary fibrosis, Judge [/bib_ref]. Doppler echocardiography is the first-line noninvasive examination but its positive and negative predictive values for the diagnosis of pulmonary hypertension are low [bib_ref] Echocardiographic assessment of pulmonary hypertension in patients with advanced lung disease, Arcasoy [/bib_ref]. Whether right heart catheterisation is indicated in an IPF patient should be decided in expert centres [bib_ref] Pulmonary hypertension in patients with idiopathic pulmonary fibrosis, Nathan [/bib_ref].

## How should pulmonary hypertension be managed if present in a patient with ipf? recommendation
It is recommended that patients with IPF and pulmonary hypertension are investigated for resting hypoxaemia, thromboembolic venous disease and left heart failure, and that patients receive appropriate treatment if needed. Lung transplantation should also be considered.
In patients with IPF and moderate precapillary pulmonary hypertension (mean Ppa f35-40 mmHg at rest), it is not recommended to prescribe any specific treatment for pulmonary hypertension.
In patients with IPF and severe precapillary pulmonary hypertension (mean Ppa o35-40 mmHg at rest), it is possible to prescribe a specific treatment for pulmonary hypertension, preferably with sildenafil in a specialised centre, if pulmonary hypertension is held responsible for worsening of symptoms.
In patients with IPF and severe precapillary pulmonary hypertension (mean Ppa o35-40 mmHg at rest), it is recommended not to prescribe ambrisentan. Comment Causes of pulmonary hypertension other than IPF should always be explored. Lung or heart-lung transplantation should be considered depending on age and comorbid conditions. No treatment specific for pulmonary hypertension is recommended or approved in patients with IPF [bib_ref] Pulmonary hypertension in chronic lung diseases, Seeger [/bib_ref].
In two uncontrolled prospective studies of sildenafil conducted in some patients with IPF and pulmonary hypertension, walk distance and pulmonary haemodynamics improved after 8-12 weeks of treatment [bib_ref] A potential role for sildenafil in the management of pulmonary hypertension in..., Madden [/bib_ref] [bib_ref] Sildenafil improves walk distance in idiopathic pulmonary fibrosis, Collard [/bib_ref]. In the randomised controlled STEP-IPF (Sildenafil Trial of Exercise Performance in IPF) trial, comparing sildenafil therapy and placebo over 12 weeks, no significant improvement of the 6MWT (primary end-point) was observed [bib_ref] A controlled trial of sildenafil in advanced idiopathic pulmonary fibrosis, Zisman [/bib_ref] , but sildenafil significantly improved arterial oxygenation, DLCO, dyspnoea and quality of life, and could be useful in patients with right ventricular dysfunction at echocardiography [bib_ref] Sildenafil preserves exercise capacity in IPF patients with right ventricular dysfunction, Han [/bib_ref].
A randomised controlled trial, ARTEMIS-IPF (www.clinicaltrials.gov; identifier NCT00768300) [bib_ref] ARTEMIS-IPF: a placebo-controlled trial of ambrisentan in idiopathic pulmonary fibrosis, Raghu [/bib_ref] , showed a detrimental effect of ambrisentan, an ET A antagonist, on the primary end-point (time to death or worsening of respiratory function) and an increased number of hospitalisations for respiratory complications. This led to premature discontinuation of another trial of ambrisentan in IPF, ARTEMIS-PH (www.clinicaltrials.gov; identifier NCT00879229). Therefore, ambrisentan is contraindicated in IPF
patients. An open label study of riociguat in patients with ILD suggested an increase in cardiac output, with unclear clinical benefit [bib_ref] Riociguat for interstitial lung disease and pulmonary hypertension: a pilot trial, Hoeper [/bib_ref].
Should IPF patients be investigated for gastro-oesophageal reflux, if so how? How should gastrooesophageal reflux be managed in IPF patients? Recommendation It is proposed that a history or symptoms of gastro-oesophageal reflux be investigated during the medical interview of all patients definitely diagnosed with IPF. If gastro-oesophageal reflux is suspected, it is proposed to perform the appropriate tests and to comply with applicable recommendations for gastrooesophageal reflux management.

## Comment
Gastro-oesophageal reflux is common in patients with IPF [bib_ref] Prevalence of hiatal hernia by blinded multidetector CT in patients with idiopathic..., Noth [/bib_ref] and is asymptomatic in 50% of cases [bib_ref] High prevalence of abnormal acid gastro-oesophageal reflux in idiopathic pulmonary fibrosis, Raghu [/bib_ref] [bib_ref] Increased prevalence of gastroesophageal reflux in patients with idiopathic pulmonary fibrosis, Tobin [/bib_ref] [bib_ref] Gastroesophageal reflux in patients with idiopathic pulmonary fibrosis referred for lung transplantation, Sweet [/bib_ref] [bib_ref] Progression of idiopathic pulmonary fibrosis: lessons from asymmetrical disease, Tcherakian [/bib_ref]. Retrospective studies have reported stabilisation of pulmonary function and oxygen requirements in association with medical or surgical treatment of gastro-oesophageal reflux [bib_ref] Laparoscopic fundoplication in patients with end-stage lung disease awaiting transplantation, Linden [/bib_ref]. A survival benefit in IPF patients treated with proton-pump inhibitors or H2 receptor antagonists has been reported previously [bib_ref] Gastroesophageal reflux therapy is associated with longer survival in patients with idiopathic..., Lee [/bib_ref]. The methodological weaknesses of this study, but also the interest of this research area, have been underlined [bib_ref] Idiopathic pulmonary fibrosis: increased survival with ''gastroesophageal reflux therapy'': fact or fallacy?, Raghu [/bib_ref] [bib_ref] Silent gastro-oesophageal reflux and microaspiration in IPF: mounting evidence for antireflux therapy?, Raghu [/bib_ref].
Available data are insufficient to recommend a particular management of gastro-oesophageal reflux in patients with IPF. The role of surgical treatment and the management of non-acid reflux remain unknown. Pirfenidone-omeprazole combination therapy should be avoided.
Should patients with IPF be investigated for emphysema, if so how? How should emphysema be managed in patients with IPF? Recommendation It is recommended to search for emphysema on the chest HRCT performed for the diagnosis of IPF to avoid underestimation of the severity of the disease if lung volumes are preserved. It is proposed that management of emphysema, if present, should be similar to that of emphysema in other settings, including smoking cessation, and inhaled bronchodilators should be used if airflow obstruction is present. No data are available to support specific drug therapy in the setting of combined pulmonary fibrosis and emphysema.

## Comment
Compared with IPF patients without emphysema, patients with combined pulmonary fibrosis and emphysema have preserved lung respiratory volumes, decreased carbon monoxide transfer and higher oxygen requirement. Disease evolution might be worse in patients with this syndrome compared to those with IPF alone [bib_ref] Combined pulmonary fibrosis and emphysema: a distinct under recognised entity, Cottin [/bib_ref] [bib_ref] Idiopathic pulmonary fibrosis and emphysema: decreased survival associated with severe pulmonary arterial..., Mejia [/bib_ref] , but there are no reliable data showing that emphysema impacts survival. Diagnosis of combined pulmonary fibrosis and emphysema is important so as not to spuriously attribute the preservation of pulmonary volumes to a milder severity of disease. Pulmonary hypertension is particularly frequent and is the main predictor of mortality in patients with the syndrome [bib_ref] Pulmonary hypertension in patients with combined pulmonary fibrosis and emphysema syndrome, Cottin [/bib_ref]. Long-term oxygen therapy might be indicated. Monitoring of FVC and DLCO does not allow an accurate assessment of prognosis [bib_ref] Pulmonary function measures predict mortality differently in IPF versus combined pulmonary fibrosis..., Schmidt [/bib_ref] [bib_ref] Coexistent emphysema delays the decrease of vital capacity in idiopathic pulmonary fibrosis, Akagi [/bib_ref].
No data are available to support recommendation of either specific management of emphysema in IPF patients, or specific management of fibrosis in patients presenting with combined pulmonary fibrosis and emphysema. Possible treatment (pirfenidone and NAC in monotherapy) must be assessed individually, taking into account side-effects, the absence of data on the potential benefit of this treatment in this indication, and the difficulty of evaluating disease evolution (little change in FVC).
Should IPF patients be explored for obstructive sleep apnoea syndrome, if so how? Recommendation It is recommended that ventilatory polygraphy be performed in patients definitely diagnosed with IPF if clinical signs suggest obstructive sleep apnoea syndrome.

## Comment
Several studies have shown a high rate of obstructive sleep apnoea syndrome in patients with IPF [bib_ref] A survey of nocturnal hypoxaemia and health related quality of life in..., Clark [/bib_ref] [bib_ref] Interstisyel akciger hastalarinda polisomnografi ile uyku ozelliklerinin degerlendirilmesi [Assessment of sleep with..., Aydogdu [/bib_ref] [bib_ref] Sleep-related breathing disorders in patients with idiopathic pulmonary fibrosis, Mermigkis [/bib_ref] , up to 88% in a series of 50 patients [bib_ref] Obstructive sleep apnea is common in idiopathic pulmonary fibrosis, Lancaster [/bib_ref]. Compared to polysomnography, medical interview has a much lower sensitivity to establish the diagnosis. Obesity is not always present. The clinical importance of detecting obstructive sleep apnoea syndrome is not demonstrated in IPF, especially if the syndrome is asymptomatic.
How should obstructive sleep apnoea syndrome be managed in patients with IPF? Recommendation No specific data on the management of sleep apnoea in patients with IPF are available. It is proposed that when present in a patient definitely diagnosed with IPF, obstructive sleep apnoea syndrome should be managed with the usual recommendations applicable in patients without IPF.

## Comment
Available data are insufficient to recommend a specific management of obstructive sleep apnoea syndrome in patients with IPF.
How should symptoms be managed in patients with IPF? Recommendation It is possible to prescribe a transient, low-dose oral corticosteroid therapy in patients with IPF presenting with incapacitating dry cough not alleviated by codeine. Efficacy and tolerance of this therapy should be monitored.
It is possible to prescribe ambulatory supplemental oxygen therapy in patients definitely diagnosed with IPF presenting with major dyspnoea at exercise and oxygen desaturation at exercise (percutaneous oxygen saturation ,88% during daily life activities or standardised exercise, such as the 6MWT).
It is possible to prescribe low-dose morphine derivatives in patients with IPF presenting with major dyspnoea, in the absence of hypercapnia, while monitoring the efficacy and tolerance of this treatment.

## Comment
Limited data suggest that oral corticosteroid therapy and thalidomide may alleviate chronic cough associated with IPF. High-dose corticosteroids or thalidomide are poorly tolerated and inadvisable. Lowdose morphine derivatives may be used in cases of major dyspnoea but side-effects of this treatment should be closely monitored [bib_ref] Low dose diamorphine reduces breathlessness without causing a fall in oxygen saturation..., Allen [/bib_ref]. Low-dose morphine derivatives (f30 mg oral morphine equivalents a day) are not associated with increased mortality in patients with chronic obstructive pulmonary disease and starting long-term oxygen therapy [bib_ref] Safety of benzodiazepines and opioids in very severe respiratory disease: national prospective..., Ekstrom [/bib_ref]. No similar data are available in patients with IPF.
A small study has suggested that exercise capacity might be improved in patients with IPF and hypoxaemia at rest who were treated with oxygen therapy [bib_ref] Increased exercise capacity in hypoxemic patients after long-term oxygen therapy, Morrison [/bib_ref]. Two retrospective studies have shown that ambulatory oxygen therapy may significantly improve 6MWT performance and dyspnoea in patients with IPF [bib_ref] Ambulatory oxygen in interstitial lung disease, Visca [/bib_ref] [bib_ref] Ambulatory oxygen in idiopathic pulmonary fibrosis: of what benefit?, Frank [/bib_ref]. In those two studies, oxygen flow was increased stepwise until percutaneous oxygen saturation was o88% in one study and 90% in the other.
What examinations should be performed and at what frequency during follow-up of an IPF patient? Recommendation It is recommended that patients definitely diagnosed with IPF should have a clinical visit and undergo pulmonary function tests, including the measurement of FVC, every 3-6 months. It is proposed that chest computed tomography be performed: if acute exacerbation of IPF is suspected; if unexplained clinical changes occur; if lung cancer is suspected; and prior to lung transplantation.

## Comment
If no other cause can be identified, the following changes suggest worsening of IPF [bib_ref] Clinical course and prediction of survival in idiopathic pulmonary fibrosis, Ley [/bib_ref] [bib_ref] Relative versus absolute change in forced vital capacity in idiopathic pulmonary fibrosis, Richeldi [/bib_ref] : 1) progressive increase of the level of dyspnoea; 2) progressive decrease of FVC (especially by o10% of the relative or absolute value); 3) progressive decrease of DLCO (especially by o15% of the relative or absolute value); 4) worsening of signs of pulmonary fibrosis on computed tomography; 5) acute exacerbation of the disease.
Visits may be repeated every 3-6 months [fig_ref] TABLE 6: Main examinations that are useful for idiopathic pulmonary fibrosis [/fig_ref]. Visits to a specialised centre (reference centre, competence centre or hospital department experienced in ILDs) must take place at least annually or more frequently if deterioration occurs. 3 monthly visits may take place in the vicinity of the patient's home, alternating with visits to a specialised centre, preferably in the context of a formal or informal care network involving the treating general practitioner and the treating pulmonologist. Is the risk of lung cancer increased during follow-up in a patient with IPF? Recommendation The risk of lung cancer is increased in patients with IPF. It is proposed that the physician in charge of follow-up be made aware of the frequent occurrence of lung cancer in patients definitely diagnosed with IPF. It is recommended that smokers are urged to quit smoking and are informed about smoking cessation assistance. In patients definitely diagnosed with IPF and lung cancer, it is recommended that IPF is taken into account for treatment decisions.

## Comment
Compared with the risk of lung cancer in the general population, the relative risk of lung cancer in patients with IPF is increased by approximately seven-fold [bib_ref] Lung cancer and cryptogenic fibrosing alveolitis. A population-based cohort study, Hubbard [/bib_ref]. Lung cancer prevalence in the IPF population is between 4.4% and 9.8% [bib_ref] Lung cancer and cryptogenic fibrosing alveolitis. A population-based cohort study, Hubbard [/bib_ref] [bib_ref] Cryptogenic fibrosing alveolitis: clinical features and their influence on survival, Turner-Warwick [/bib_ref] [bib_ref] Cryptogenic fibrosing alveolitis and lung cancer: the BTS study, Harris [/bib_ref] , and a retrospective study reported a 55% 10-year risk of developing lung cancer [bib_ref] Cumulative incidence of and predictive factors for lung cancer in IPF, Ozawa [/bib_ref]. Neither specific screening nor specific management of lung cancer in IPF patients can be recommended.
Lung cancer management is made more difficult by IPF and by the risk of acute respiratory failure and/or acute exacerbation associated with treatments of cancer (surgical resection, radiation therapy and chemotherapy) [bib_ref] Idiopathic pulmonary fibrosis: phenotypes and comorbidities, Fell [/bib_ref].

## Should patients with ipf be investigated for other comorbid conditions? recommendation
It is proposed that comorbid conditions (cardiovascular disease, thromboembolic venous disease, diabetes and depression) be evaluated in patients definitely diagnosed with IPF, in order to inform the physician who is in charge of follow-up.

## Comment
Comorbid conditions, in particular those linked to smoking including cardiovascular disease, thromboembolic venous disease, diabetes and depression, are frequently present in patients with IPF [bib_ref] Idiopathic pulmonary fibrosis: phenotypes and comorbidities, Fell [/bib_ref]. Available data are insufficient to recommend systematic screening of such comorbid conditions, but informing the physician in charge of follow-up (general practitioner or pulmonologist responsible for the organisation of care) of the presence of a comorbid condition is important.

# Conclusion
Since the ATS/ERS/JRS/ALAT guidelines on the diagnosis and management of IPF were published in 2011, new data from major clinical studies has prompted IPF experts from several European countries to release updated recommendations in the form of national consensus statements or opinions [bib_ref] Evidence-based treatment strategies in idiopathic pulmonary fibrosis, Behr [/bib_ref] [bib_ref] Review of IPF diagnosis and management recommendations in Europe, Xaubet [/bib_ref].
The need to incorporate recent evidence into recommendations for the diagnosis and management of IPF was the basis of the present document. Our main objective was to provide French pulmonologists with an updated, practical, decision-making tool that could be used in the daily clinical care of patients with suspected or definitely diagnosed IPF.
This document complied with the specific national method and validation processes defined by the Haute Autorite de Sante as good clinical practice for the development of guidelines. The organisation of the three committees with specific missions ensured the involvement of prominent pulmonologists, radiologists and pathologists experienced in the diagnosis and/or management of IPF.
In France, the network of the reference centre and the competence centres for rare lung diseases is responsible for organising the care of patients with rare diseases, including IPF, in collaboration with local pulmonologists, general physicians and other specialists involved in diagnosis and management. These expert centres are geographically spread across all regions of France. The reference centre and the competence centres for rare lung diseases coordinated the entire process of preparation of the present guidelines, in order to standardise and optimise care, but the present recommendations accurately reflect the collective thinking of all the experts involved.
Another feature of the present document is that it gives clinicians guidance even when the compelling evidence for (or against) an examination or treatment is lacking. Formulations such as ''It is proposed to'' or ''It is possible to'' accompanied by a summary of the literature justifying these formulations should help the reader to exert informed clinical judgment and decide whether the related diagnostic or therapeutic intervention is appropriate in a given clinical situation.
The main differences between our recommendations and the 2011 guidelines originate from recently emerged evidence. 1) Triple therapy with a prednisone, azathioprine and NAC should not be initiated in patients with IPF as it has been shown to increase mortality. 2) Corticosteroid therapy is associated with substantial morbidity and, in combination with immunomodulator therapy, might increase mortality. Corticosteroid therapy is no longer an option for the treatment of IPF, except to alleviate incapacitating cough or to treat acute exacerbation of IPF. 3) Ambrisentan is now contraindicated in the treatment in IPF. 4) To date, pirfenidone is the only pharmacological treatment with demonstrated benefits in IPF patients, and the only treatment that has been approved and granted marketing authorisation for this indication.
We are confident that the present recommendations will help clinicians caring for IPF patients to base their practice on currently available evidence before the much needed updated international guidelines are released.
[fig] FIGURE 2: High-resolution computed tomography scan demonstrating a typical example of usual interstitial pneumonia pattern with honeycombing change and traction bronchiectasis, as well as subpleural and basal reticulation. No features are seen suggesting an alternative diagnosis. [/fig]
[fig] FIGURE 3 a: b) Representative examples of the lung biopsies. High-resolution computed tomography scans demonstrating possible usual interstitial pneumonia pattern with subpleural and basal reticulation, and traction bronchiectasis. No features are seen suggesting an alternative diagnosis. Video-assisted surgical lung biopsy demonstrated definite usual interstitial pneumonia pattern. IDIOPATHIC PULMONARY FIBROSIS | V. COTTIN ET AL. DOI: 10.1183/09059180.00001814 and precapillary pulmonary hypertension. 3) Signs and symptoms occurring during the clinical course: [/fig]
[table] TABLE 2: Diagnosis of idiopathic pulmonary fibrosis (IPF) [/table]
[table] TABLE 3: Chest high-resolution computed tomography methodsMandatoryNo injection of contrast medium Inspiratory apnoea slices Axial contiguous or non-reconstructed slices separated by f2 cm Slice thickness f2 mm Reconstruction field focused on lungs Image acquisition complying with European irradiation norms Archiving of image acquisition of millimetric slices on CD/DVD for further reading OptionalFrontal reconstruction in minimal intensity projection, 5-8 mm thick # Images in the prone position, if opacities linked to gravito-dependance hamper the analysis when in the supine position Expiration slices to exclude lobular air trapping " Coronal and sagittal reconstructions if volumetric acquisitions are available # : to differentiate bronchiolectasis from honeycombing; " : more frequent in patients with hypersensitivity pneumonitis. IDIOPATHIC PULMONARY FIBROSIS | V. COTTIN ET AL. DOI: 10.1183/09059180.00001814 [/table]
[table] TABLE 4: Indications and techniques of lung biopsy in patients with suspected idiopathic pulmonary fibrosis (IPF) [/table]
[table] TABLE 5: Histopathological criteria for usual interstitial pneumonia (UIP) pattern [/table]
[table] TABLE 6: Main examinations that are useful for idiopathic pulmonary fibrosis (IPF) diagnosis and management Transaminases, c-glutamyltransferase and alkaline phosphatases Occasional Video-assisted surgical lung biopsy (see text) Differential cell count of BAL (see text) TLC and arterial blood gas in room air at rest 6MWT with measurement of percutaneous oxygen saturation Depending on context Genetic testing (see text) Anti-neutrophil cytoplasmic antibodies Anti-SSA and anti-SSB antibodies Anti-centromere and anti-topoisomerase antibodies Anti-Mi-2, anti-U3RNP and anti-ARNt synthetase antibodies Creatine phosphokinase Anti-thyroid antibodies Precipitines (depending on disease presentation) Microbiology of BAL Electrophoresis of serum proteins, immuno-electrophoresis of serum proteins, urine immunofixation and cryoglobulinaemia Exploration for gastro-oesophageal reflux Exploration for sleep apnoea syndrome HRCT: high-resolution computed tomography; FVC: forced vital capacity; DLCO: diffusing capacity of the lung for carbon monoxide; BAL: bronchoalveolar lavage; TLC: total lung capacity; 6MWT: 6-min walk test. IDIOPATHIC PULMONARY FIBROSIS | V. COTTIN ET AL. DOI: 10.1183/09059180.00001814 [/table]