Non-Invasive Ventilation in Amyotrophic Lateral Sclerosis

Study Overview
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Brief Summary
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Non-invasive mechanical ventilation (NIV) has been increasingly used as a treatment of chronic hypercapnic respiratory failure. Its use in patients affected by chronic obstructive pulmonary disorders is still controversial, while most of the studies performed in restrictive thoracic disorders (RTD), and in particular in neuromuscular patients, suggested alleviation of the symptoms of chronic hypoventilation in the short term, and in two small studies survival was prolonged. In the terminal phase of the disease, when the respiratory muscles became weaker it is very likely that the operators need to frequently adjust the level of inspiratory pressure in an attempt to guarantee an adequate tidal volume, so that alveolar hypoventilation may be avoided. Theoretically the use of a volume assisted ventilation may overpass this problem of frequent variations of the settings, since the provision of a fixed tidal volume may always guarantee and adequate alveolar ventilation. The primary aims of this multicenter randomized study are to evaluate the clinical efficacy, the patients' tolerance and quality of life and the frequency of changing settings in a group of patients with SLS and initial chronic respiratory failure undergoing long-term NIV with Pressure Support Ventilation or Volume Assisted Ventilation.

Detailed Description
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Background Non-invasive mechanical ventilation (NIV) has been increasingly used as a treatment of chronic hypercapnic respiratory failure. Its use in patients affected by chronic obstructive pulmonary disorders is still controversial, while most of the studies performed in restrictive thoracic disorders (RTD), and in particular in neuromuscular patients, suggested alleviation of the symptoms of chronic hypoventilation in the short term, and in two small studies survival was prolonged. As a matter of fact a recent Cochrane review stated that long-term mechanical ventilation should be offered as a therapeutic option to patients with chronic respiratory failure due to neuromuscular diseases. Recurrent episodes of nocturnal desaturation especially during REM sleep may deeply influence the prognosis of patients affect by these disorders (i.e. ALS), and they are often associated with hypercapnia, so that the correction of nocturnal hypoventilation seems to be the major goal to achieve with the ventilatory treatment. A very recent randomized controlled trial show that in ALS without severe bulbar dysfunction, NIV improves survival with maintenance of, and improvement in, quality of life, including sleep quality. The survival benefit from NIV in this group is much greater than that from currently available neuroprotective therapy, like riluzole. Most of the studies performed in RTD disorders were performed using a pressure assisted mode (i.e Pressure Support Ventilation), because of the supposed better tolerance of the patients and easy of settings for the operators, even though this has never been scientifically proven. In the terminal phase of the disease, when the respiratory muscles became weaker it is very likely that the operators need to frequently adjust the level of inspiratory pressure in an attempt to guarantee an adequate tidal volume, so that alveolar hypoventilation may be avoided. Theoretically the use of a volume assisted ventilation may overpass this problem of frequent variations of the settings, since the provision of a fixed tidal volume may always guarantee and adequate alveolar ventilation. The primary aims of this multicenter randomized study are to evaluate the clinical efficacy, the patients' tolerance and quality of life and the frequency of changing settings in a group of patients with SLS and initial chronic respiratory failure undergoing long-term NIV with Pressure Support Ventilation or Volume Assisted Ventilation. Aim of the Project The primary aims of the project are to evaluate the clinical efficacy, the patients' tolerance and quality of life and the frequency of changing settings in a group of patients with SLS and initial chronic respiratory failure undergoing long-term NIV with Pressure Support Ventilation or Volume Assisted Ventilation. • Enrollment criteria: Patients with the diagnosis of ALS and one of the following signs: 1) Vital Capacity < 50% predicted 2) a Maximal Inspiratory Pressure (MIP) < 60% predicted 3) polygraphic signs of nocturnal hypoventilation with daytime symptoms. - The patients will be randomized to receive NIV with one of the following modes: 1) Pressure Support Ventilation with the inspiratory pressure set according to the patient's tolerance in order to achieve an expired tidal volume > 6 ml/Kg and <8ml/Kg. The back-up rate will be set at 10 breaths/min. 2) Volume assist ventilation with a back-up rate of 10 breaths/min and a tidal volume set to achieve an expired tidal volume > 6 ml/Kg and <8ml/Kg

Official Title
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Role of Non-invasive Ventilation in Amyotrophic Lateral Sclerosis: Volume Versus Pressure Mode

Conditions
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Amyotrophic Lateral Sclerosis, Chronic Respiratory Failure

Intervention / Treatment
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* Device: Non invasive ventilation delivered with one of the ventilator specifically designed for NIV and given to the patient by the home care providers
* Device: Non invasive ventilation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with the diagnosis of ALS and one of the following signs: Vital Capacity < 50% predicted A Maximal Inspiratory Pressure (MIP) < 60% predicted Polygraphic signs of nocturnal hypoventilation with daytime symptoms. Exclusion Criteria: Life expectancy>12 months Any comorbidity Acute Respiratory Failure

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1<br>Volume assist non-invasive ventilation | Device: Non invasive ventilation delivered with one of the ventilator specifically designed for NIV and given to the patient by the home care providers<br>* A very recent randomized controlled trial show that in ALS without severe bulbar dysfunction, NIV improves survival with maintenance of, and improvement in, quality of life, including sleep quality. The survival benefit from NIV in this group is much greater than that from currently available neuroprotective therapy, like riluzole.<br>* Other names: Synchrony (Respironics);Device: Non invasive ventilation<br>* A very recent randomized controlled trial show that in ALS without severe bulbar dysfunction, NIV improves survival with maintenance of, and improvement in, quality of life, including sleep quality. The survival benefit from NIV in this group is much greater than that from currently available neuroprotective therapy, like riluzole.<br>* Other names: Synchrony (Respironics);|
| Active Comparator: 2<br>Pressure Assist mode | Device: Non invasive ventilation delivered with one of the ventilator specifically designed for NIV and given to the patient by the home care providers<br>* A very recent randomized controlled trial show that in ALS without severe bulbar dysfunction, NIV improves survival with maintenance of, and improvement in, quality of life, including sleep quality. The survival benefit from NIV in this group is much greater than that from currently available neuroprotective therapy, like riluzole.<br>* Other names: Synchrony (Respironics);Device: Non invasive ventilation<br>* A very recent randomized controlled trial show that in ALS without severe bulbar dysfunction, NIV improves survival with maintenance of, and improvement in, quality of life, including sleep quality. The survival benefit from NIV in this group is much greater than that from currently available neuroprotective therapy, like riluzole.<br>* Other names: Synchrony (Respironics);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| quality of life |  | 1 year | 
| tolerance to NIV |  | 1 year | 
| number of hours of NIV per day |  | 1 year | 
| frequency of hospital admission |  | 1 year | 
| frequency of changing the ventilator settings by the operator. |  | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| survival |  | 1 year | 
| diurnal and nocturnal gas exchange |  | 1 year | 
| Pulmonary Function Tests (PFTs). |  | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Amyotrophic Lateral Sclerosis, Non-invasive ventilation, Chronic Respiratory Failure