Table 1. Caval Vein Pressures and Related Variables of Patients Undergoing Intraperitoneal or Left or Right Retroperitoneal^{*}CO^{2}Insufflation

Data are mean ± SD from 20 anesthetized patients undergoing either intraperitoneal (n = 8) or left (n = 6) or right (n = 6) retroperitoneal (prone position) CO^{2}insufflation. *P* values in parenthesis derive from one-way** (insufflation pressure) and two-way (insufflation pressure × group) analysis of variance for repeated measurements within and across groups, respectively, as appropriate.

**P* < 0.05 *versus* group baseline.

†*P* < 0.05 for comparison between groups at same insufflation pressure.

‡*P* < 0.05 *versus* group desufflation.

§*P* < 0.05 *versus* corresponding left retroperitoneal value.

∥*P* < 0.05 *versus* preceding group value.

#*P* < 0.05 *versus* 10 mmHg insufflation pressure.

ANOVA = analysis of variance.