Before going off to sleep patients are given oxygen to saturate blood with oxygen to extend time before a decrease in the level of oxygen in the blood occurs. During this period, obese patients have a faster decrease in the level of oxygen in their blood. This study uses a device called "high-flow nasal cannula" (HFNC), which delivers humidified high-flow oxygen through 2 small plastic tubes placed just inside nostrils. In the intensive care unit settings this device has been used extensively and has become a standard practice. Purpose of this study is to determine whether these high-flow nasal cannula increase the time safely when going to sleep during elective surgery.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
40
High flow nasal oxygen (60 l) under GA
Standard oxygen (10-15 l) under GA
Toronto Western Hospital
Toronto, Ontario, Canada
Measurement of safe apnea time
Safe apnea time, defined by time to desaturation (SpO2 \> 95%) or apnea maximum up to 6 minutes
Time frame: Maximum up to 6 minutes
Highest EtCO2
Highest EtCO2 on commencing ventilation
Time frame: Every minute up to 5 minutes on commencing ventilation
Lowest SpO2
Lowest SpO2 during intubation procedure
Time frame: Every minute up to 5 minutes after intubation
Time to regain baseline SpO2
Time to regain baseline SpO2 after intubation
Time frame: Up to 5 minutes after intubation
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