[Effects of low dose colforsin daropate hydrochloride in patients undergoing off-pump coronary artery bypass grafting].

Background: We evaluated retrospectively the effectiveness of low dose colforsin daropate hydrochloride (CDH) in 12 patients undergoing off-pump coronary artery bypass grafting (CABG).

Methods: Low dose CDH was administered intravenously at a rate of 0.05-0.1 microg x kg(-1) x min(-1) from sternotomy to the end of coronary artery anastomosis. Hemodynamic measurements were made before infusion of CDH, and before, during, and after coronary artery anastomosis.

Results: Heart rate was significantly higher before, during and after the anastomosis compared with the value before the infusion of CDH. Heart rate was also significantly higher after the anastomosis compared with the value before the anastomosis. Systolic blood pressure, mean pulmonary pressure, right atrial pressure and pulmonary artery wedge pressure showed no significant changes after the start of infusion of CDH. Cardiac output was significantly higher before, during and after the anastomosis compared with the value before the infusion of CDH. Systemic vascular resistance was significantly lower before and during anastomosis compared with the value before the infusion of CDH.

Conclusions: Infusion of low dose CDH prevents the elevations of mean pulmonary artery pressure, right atrial pressure and pulmonary artery wedge pressure without reducing systolic bood pressure during coronary artery anastomosis. Cardiac output was significantly increased, and SVR as well as PVR were significantly decreased after the infusion of CDH. In patients undergoing off-pump CABG, we recommend infusion of low dose colforsin daropate hydrochloride from sternotomy to the end of coronary artery anastomosis.