This physiological study aims to compare Bilevel Positive Airway Pressure and continuons positive airway pressure in infants with severe bronchiolitis presenting with apnea

This study is a cross over randomized study which aims to compare the effect of 2 modes of noninvasive ventilation on the occurence of central apnea, as measured by electrical activity of the diaphragm

Inclusion Criteria:

• Children born at gestational age > 36 weeks gestation
• Ventilated in Non Invasive Ventilation (NIV) for acute bronchiolitis (clinical criteria of the American Academy of Pediatrics)
• Having presented at least 1 apnea objectified by the parents or by a health care professional, as previously described (1), with one or more of the following characteristics: 1/Associated with bradycardia < 80 / min, 2/Associated with desaturation < 85% or 3/Duration more than 10 seconds
• Informed consent signed by at least one of the two parents + oral agreement from the second parent before the intervention of the study (2nd signature to be collected as soon as possible)

Exclusion Criteria:

• With chronic respiratory insufficiency requiring home ventilation (NIV or under long-term oxygen therapy, initiated at least 14 days before the start of the study)
• Ventilated in NIV for more than 48 hours before inclusion
• Hemodynamically significant cardiac disease, primary ENT or pulmonary pathology (malformative or genetic) or neuromuscular pathology
• Presenting a contraindication of a gastric tube (trauma or recent surgery concerning the cervical, pharyngeal or esophageal regions, severe coagulation disorders)
• Patient not affiliated to health care insurance