ABSTRACT
Objective To compare the changes in cardiac output (CO) and other hemodynamic parameters in patients undergoing gynecological laparoscopic surgery in head-down lithotomy position and Trendelenburg position. Methods Sixty patients were divided into head-down lithotomy group and Trendelenburg group. CO was recorded as baseline by a noninvasive cardiac output monitor NICOM? system after the placement of patients. These measurements were also acquired when the patients were placed in the 30° head-down tilt(T0)following pneumoperitoneum establishment.Stroke volume(SV), heart rate(HR)and CO were monitored at 1-minute intervals thereafter for a total of 10 minutes(T1-T10),and mean arterial pressure(MAP)and total peripheral resistance(TPR)were monitored every 5 minutes. Results The reduction of CO in head-down lithotomy group was greater than that in Trendelenburg group(T0:-31％±19％ vs.-9％±34％;T1:-32％±18％ vs.-16％±38％;T2:-33％± 19％vs.-16％±26％;T3:-32％±22％vs.-16％±28％;T4:-31％±18％vs.-12％±38％;T5:-30％± 17％vs.-14％±37％;T6:-31％±17％ vs.-14％±33％,all P<0.05)during the first 6 minutes. MAP at baseline in head-down lithotomy group was significantly higher than that in Trendelenburg group[(97±11) mmHg vs.(85±6)mmHg,P<0.05].MAP decreased in head-down lithotomy group at T0(-8％±16％) and increased in Trendelenburg group at T5 and T10(T5:9％±15％,T10:12％±18％). Conclusion CO reduction was greater in patients in head-down lithotomy position than that in Trendelenburg position group during the first 10 minutes after adjusting the position following pneumoperitoneum establishment.