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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
NONE
Enrollment
50
Positive Pressure Ventilation with a 4 cmH2O inhale pressure, a positive end-expiratory pressure of 4 cm H2O, a trigger 2, an inspiratory slope of 0, an inhaled oxygen fraction of 100% administered at a 10 L / min flow.
Spontaneously breathing preoxygenation with adapted face mask, to restrict leakage, at 10L/min oxygen, with inhaled fraction of 100% and a 2 L balloon volume.
CHU Amiens
Amiens, France
non hypoxemic apnea time
time the oxygen saturation is going down to 90% during apnea
Time frame: up to 5 minutes after stopping oxygenation
surgical laryngoscopy frequency
number of stopped surgical laryngoscopy because of a low oxygen saturation under 90% with necessity to ventilate the patients during apnea
Time frame: up to 15 minutes after stopping oxygenation
preoxygenation time
time to reach expired oxygen fraction to 90%
Time frame: up to 10 min after the start of oxygenation
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