To compare preoxygenation for induction of general anaesthesia with High Flow Nasal Cannula vs preoxygenation with face mask in patients undergoing bariatric surgery. The hypothesis is that preoxygenation with High Flow Nasal Cannula prolongs normoxia time during induction of anaeshesia and is superior to conventional preoxygenation with face mask. Primary endpoint will be the time during which spO2 \> 92 %. Secondary endpoint will be paCO2.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
100
Preoxygenation for 5 minutes via High Flow Nasal Cannula. After induction of anaesthesia apnoeic oxygenation with HFNC
Preoxygenation for 5 minutes via face mask. After induction of anaesthesia apnoeic oxygenation with tight fitting face mask
Normoxia time SpO2 > 92%
Time in which the SpO2 remains \> 92% while patient is apnoeic
Time frame: 10 Minutes after induction
paCO2
Increase in arterial CO2 during Apnoea
Time frame: 10 Minutes after induction
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