Using Positive Pressure Ventilation for Preoxygenation During Panendoscopy.

Non Invasive Ventilation (NIV) Versus Spontaneous Breathing for Preoxygenation During Ear, Nose, and Throat (ENT) Panendoscopy. A Controlled, Prospective, Randomized Study.

the aim of the study is to determine if Spontaneous Ventilation with Positive Pressure Ventilation (PPV) preoxygenation allows a longer non hypoxemic apnea time during panendoscopy compared to spontaneous breathing preoxygenation.

the hypothesis is PPV extends the residual functional capacity of lung so it provides more oxygen during apnea.

Inclusion Criteria:

• patient going for scheduled panendoscopy under general anesthesia

Exclusion Criteria:

• BMI upper to 35 kg/m2
• pregnancy
• requirement of jet ventilation
• tracheostomy
• acute respiratory failure: pneumonia, pulmonary embolism
• health insurance careless