Left ventricular loading modifications induced by pneumoperitoneum: a time course echocardiographic study.
UNLABELLED: The intraperitoneal insufflation of carbon dioxide during laparoscopic procedures is associated with an increase in mean arterial pressure and systemic vascular resistance. To evaluate the time course of the circulatory changes related to intraabdominal pressure variation, we used transesophageal echocardiography in 10 patients anesthetized for laparoscopic cholecystectomy. Left ventricular dimensions, fractional area shortening (FAS), and left ventricular afterload assessed by the left ventricular end-systolic wall stress (LVESWS) were measured from echocardiographic data before insufflation, during pneumoperitoneum, and during exsufflation. Three minutes after the onset of pneumoperitoneum, we observed a 25.7% +/- 10.5% (mean +/- SD) increase in mean arterial pressure, a 49.1% +/- 14.4% increase in LVESWS, and a 17.0% +/- 16.2% decrease in FAS. All measured variables returned to preinsufflation values after 30 min of pneumoperitoneum and thereafter were no longer significantly affected by postural changes (10 degrees head-up position) or pneumoperitoneum exsufflation. We conclude that the circulatory changes associated with pneumoperitoneum are transient and are probably mediated by factors other than intraabdominal pressure variations. IMPLICATIONS: Insufflation of gas into the abdominal cavity results in hemodynamic changes during laparoscopic procedures. We found that echocardiographic and blood pressure effects associated with gas insufflation were transient, indicating mediation by factors besides intraabdominal pressure.