Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Prospective , Multicenter , Randomized, Controlled, Parallel-group , Open-label Trial Evaluating Benefits of High Flow Nasal Cannula (HFNC) Oxygen for Preoxygenation During Intubation in Non Severely Hypoxemic Patients
Brief Summary: The aim of this study is to determine whether High Flow nasal cannula (HFNC) oxygen is more efficient than the standard High Flow face mask (HFFM) for preoxygenation before orotracheal intubation after crash induction in non severely hypoxemic patients


Options:
A: Main inclusion Criteria:

* acute hypoxemic respiratory failure requiring endotracheal intubation

Main exclusion Criteria:

* coma
* NIV contraindication
B: Inclusion Criteria:

* Signed informed consent.
* Undergoing surgery with general anaesthesia.
* Adult, \>18 years old.
* American Society of Anesthesiology classification I-II.

Exclusion Criteria:

* Coagulation disorders or a tendency of nose bleeding
* An episode/exacerbation of congestive heart failure (CHF) that requires a change in medication, diet or hospitalization from any cause in the last 6 months
* Severe aortic stenosis or mitral stenosis;
* Cardiac surgery involving thoracotomy (e.g., coronary artery bypass graft (CABG), valve replacement surgery) in the last 6 months;
* Acute myocardial infarction in the last 6 months;
* Acute arrhythmia (including both tachycardia and bradycardia) with hemodynamic instability;
* Diagnosed COPD or current other acute or chronic lung disease requiring supplemental chronic or intermittent oxygen therapy);
* Increased intracranial pressure;
* ASA \>II;
* Mouth, nose, or throat infection;
* Fever, defined as core body temperature \> 37.5°C;
* Pregnancy, breastfeeding or positive pregnancy test;
* Emergency procedure.
* Patient with known or suspected difficult airway
C: Inclusion Criteria:

* Adults older than 18 years regardless of the gender
* Requiring orotracheal intubation in intensive care unit
* "No severely hypoxemic respiratory failure" defined as Oxygen Pression (Pa02)/FI02 \> 200 mmHg measured in the 4 hours before inclusion

Exclusion Criteria:

* Not the first Intubation during this stay in intensive care unit
* Contraindication to oro-tracheal intubation
* Intubation without anaesthesic rapid sequence induction
* Intubation during cardiac arrest
* Real emergency (as asphyxia) with immediate intubation needed (without time enough for randomization)
* Nasopharyngeal obstacle with contraindication to use Optiflow device
* Patients with a documented Cormack IV exposition before inclusion
* Protected adult
* Pregnancy or breastfeeding
* Lack of consent
* Patient already enrolled in another study that could interfere with the primary objective of this study
D: Inclusion Criteria:

* Adults older than 18 years regardless of the gender
* Acute hypoxemic respiratory failure defined as :

Respiratory rate \> 30/mn AND Hypoxemia with SpO2 \<90% with oxygen supply \> FiO2 0,5 AND PaO2/FiO2 \<300 mmHg

Exclusion Criteria:

* Contraindication to oro-tracheal intubation
* Intubation without anesthetic delivery
* Intubation during cardiac arrest
* Asphyxia with immediate intubation needed
* Nasopharyngeal obstacle with contraindication to use Optiflow device
* Patients with a documented Cormack IV exposition before inclusion
* Protected adult
* Pregnancy
* Lack of consent
* Patient already enrolled in an other randomized study.

Answer: C