Introduction
Obesity, obese
OBESITY, OBESE
Obesity prevalence is rising worldwide, leading to an increasing number of obese patients needing surgical interventions [Various preoxygenation methods have been suggested to lengthen the SNHAP in the obese population. To increase the FRC and the oxygen reserve, several authors suggested optimizing the operating table position during preoxygenation [This study was thus designed to compare the effects of reverse Trendelenburg position associated with non-invasive positive pressure ventilation compared to the traditional preoxygenation in ramp position associated with spontaneous breathing on SNHAP in morbidly obese patients. We hypothesized that the former would improve oxygenation parameters in morbidly obese patients undergoing general anesthesia.