Laparoscopic cholecystectomies with low pressure of pneumoperitoneum in high risk senile patients;

Objectives To study the impact of CO2 pneumoperitoneum of different pressure on the pulmonary functions,and to evaluate the appropriate range of pressure of the CO2 pneumoperitoneum during laparoscopic procedure.

Effects of pneumoperitoneal pressure on liver function after operation in patients undergoing laparoscopic operation;