Please select the eligibility criteria that correspond to the clinical trial below.
Title: Physiologic Effects of High Flow Nasal Therapy in Patients With Acute Hypoxemic Respiratory Failure
Brief Summary: The aim of the study is to assess, in patients with acute hypoxemic respiratory failure, the short term physiologic effects of the high flow oxygen nasal therapy (Optiflow), in term of inspiratory muscle effort, gas exchange, comfort and dyspnea


Options:
A: Inclusion Criteria:

* Acute respiratory insufficiency, defined as the PaO2/FIO2 ratio of 300 mm Hg or less after breathing oxygen
* The presence of lung infiltrates on a posteroanterior chest radiograph

Exclusion Criteria:

* Face or cranial trauma or surgery
* Patients younger than 18 years
* History of COPD
* Acute respiratory acidosis (defined as a pH \<7.30 and a PaCO2 \>50 mm Hg)
* Hemodynamic instability with arterial pressure \< 90mmHg
* Respiratory instability with PaO2/FiO2\<100mmHg
* ventricular arrhythmias
* Excess respiratory secretions.
* Upper gastrointestinal bleeding
* Recent gastric or oesophageal surgery
* Tracheostomy or other airways disorders
* Pneumothorax
* Contraindication of gastric probe insertion
* Impossibility to insert the oesophageal probe
B: Inclusion Criteria:

* Mechanical ventilation \> 24h
* Successful spontaneous breathing trial conducted for a period of 30-120 min.
* PaO2/FiO2 ≤ 300 at the end of the spontaneous breathing trial preceding extubation

Exclusion Criteria:

* age\<18 years
* pregnancy
* tracheostomy
* need of NIV post-extubation (prophylactic NIV)
C: Inclusion Criteria:

* Presence of chronic obstructive pulmonary disease (COPD) and acute hypercapnic respiratory failure;
* 7.25 \< pH \< 7.35;
* Arterial Partial pressure of carbon dioxide (PaCO2) equal or greater than 55 mmHg;
* Age \> 18 years/old

Exclusion Criteria:

* Invasive mechanical ventilation in the last 60 days
* Use of any form of noninvasive ventilation or high flow oxygen through nasal cannula (HFNT) prior to study enrollment after the onset of acute hypercapnic respiratory failure (AHRF);
* Noninvasive home care ventilation;
* Unstable clinical condition (need for vasopressors for \>24 h, acute coronary syndrome or life-threatening arrhythmias);
* Refusal of treatment;
* Agitation (RASS \>= +2) or non-cooperation (Kelly Matthay \>=5);
* Failure of more than two organs;
* Cardiac arrest;
* Respiratory arrest requiring tracheal intubation;
* Recent trauma or burns of the neck and face;
* Pregnancy;
* Refusal of consent;
* Inclusion in other research protocols.
D: Inclusion Criteria:

* Age over 18 years.
* Admission to ICU for ARF. ARF was defined with the need of oxygen over 6l/min to maintain SpO2 over 95% or symptom of respiratory distress (intercostal recession or tachypnea \>30/min or dyspnea at rest).
* Immunosuppression. Immunosuppressed conditions were solid tumor, hematological malignancy, steroid treatment or other immunosuppressive treatment, or HIV infection.

Exclusion Criteria:

* Hypercapnia (above 47 mmHg)
* Chronic respiratory failure
* Previous mechanical ventilation in the days before admission
* Need of immediate NIV or intubation
* Refusal
* Pregnancy

Answer: A