CARDIOVASCULAR CHANGES DURING LAPAROSCOPIC CHOLECYSTECTOMY

Although the technique of laproscopic cholecystectomy has increasing appeal, physiologic data to support the safety of this, procedure are lacking. We studied the cardiovascular changes in 16 patients undergoing laparoscopic cholecystectomy, using impedance cardiography as a noninvasive means of continuous monitoring of cardiac output. Serial measurements of mean arterial pressure (MAP), heart rate (HR), intraperitoneal pressure and expired carbon dioxide tension (PE(CO2)) were also recorded. Results revealed a decrease of 30 percent (p<0.001) in cardiac index and 5 percent (p=0.089) in HR, along with increases of 15 percent (p<0.001) in MAP and of 79 percent (p<0.001) in the calculated total peripheral resistance index. This elevation in afterload could lead to both an increase in myocardial oxygen consumption and to the potential risk of myocardial ischemia and possibly infarction or congestive heart failure, or both, in patients who are susceptible. The data suggest that patients with a history of cardiac disease should have preoperative cardiac evaluation and be closely monitored during laparoscopic cholecystectomy, as in any other extensive operation.