Ni L, et al. - Experts tested the presumption that different types of surgical frame and the patient's body mass index (BMI) can affect pulmonary compliance, intra-abdominal pressure (IAP), and oxygenation. An increase in the oxygenation index and a decrease in IAP was resulted by turning patients from the supine to the prone position during anesthesia. Authors noted a dependence of both of these factors upon the type of surgical frame used and the patient's BMI. The particular significance of the reduction in IAP was seen when a Jackson surgical table was used for overweight patients.