Effects of amrinone on cardiac index, venous oxygen saturation and venous admixture in patients recovering from cardiac surgery.
The hemodynamic and oxygen transport effects of low-dose (0.75 mg/kg loading dose + 10 micrograms/kg/min infusion, n = 12) and high-dose (2.25 mg/kg loading dose + 20 micrograms/kg/min infusion, n = 12) amrinone were evaluated in extubated patients 24 h after CABG. At both doses, amrinone significantly (p less than 0.05) increased HR, but decreased mean arterial, mean pulmonary artery, central venous and pulmonary artery occlusion pressures. High-dose amrinone significantly decreased systemic vascular resistance. Arterial oxygen saturation decreased significantly following both low- (97.8 +/- 0.4 to 95.6 +/- 0.9 percent) and high- (98.8 +/- 3.4 to 93.9 +/- 1.2 percent) dose amrinone. Pulmonary shunt increased significantly following low-dose amrinone and markedly increased Qs/Qt after high-dose amrinone. Although amrinone significantly increased cardiac index in a dose-dependent fashion (low:3.0 +/- 0.2 to 3.3 +/- 0.3 L/min/m2; high:2.7 +/- 0.2 to 3.4 +/- 0.2 L/min/m2), mixed venous oxygen saturation did not change. Thus, mixed venous oxygen saturation may not predict the hemodynamic response to amrinone infusion in postoperative surgical patients.
Prielipp
R C
RC
Department of Anesthesia, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27103.
Butterworth
J F
JF
Zaloga
G P
GP
Robertie
P G
PG
Royster
R L
RL
D000676:Amrinone / Q000008:administration & dosage / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D002302:Cardiac Output / Q000187:drug effects*; D001026:Coronary Artery Bypass; D004305:Dose-Response Relationship, Drug; D005260:Female; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood*; D011184:Postoperative Period
D000676:Amrinone; D010100:Oxygen; D002118:Calcium