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.
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non hypoxemic apnea time
Timeframe: up to 5 minutes after stopping oxygenation