ABSTRACT
Hemodynamic variables in 8 verapamil pretreated patients(the verapamil pretreated group) were compared with those in 10 patients without pretreatment(the control group) during nitroglycerin(NTG) induced hypotension under halothane-N2O anesthesis. The results were as follows: 1) In the control group, there were statistically significant decreases in mean arterial pressure (MAP)(25%), pulmonary arterial pressure(PAP)(32%), pulmonary capillary wedge pressure(PCWP)(30%), central venous pressure(CVP)(33%), but the heart rate(HR), cardiac output(CO), cardiac index(CI) and stroke volume index(SVI) remained unchanged. After discontinuance of NTG, all parameters returned to baseline levels. 2) Verapamil alone produced a small decrease in MAP(6%) and CVP(9%), but other hemodynamic values did not change. 3) In the verapamil pretreated group, there were significant decreases in MAP(23%), PAP(30%), PCWP(27%), CVP(20%), SVR(24%) and PVR(31%), but HR, CO, CI, and SVI remained unchanged. 4) These results indicated that verapamil did not significantly affect the hemodynamic response to NTG under halothane-N2O Anesthesis.