A randomised, clinical study of the effect of low-dose dopamine on central and renal haemodynamics in infrarenal aortic surgery.

OBJECTIVE

To determine whether dopamine prevents deterioration of central haemodynamics and renal function in aortoiliac surgery.

DESIGN

Prospective, randomised and placebo-controlled.

SETTING

University hospital.

MATERIALS

Thirty patients for elective vascular surgery with implantation of an aortobifemoral or an aortobiiliac graft due to aortoiliac arteriosclerosis had infusion of dopamine 3 micrograms/kg/min or placebo during the operation and 24 h postoperatively. Thoracic epidural analgesia and general anaesthesia were used.

CHIEF OUTCOME MEASURES

Central haemodynamic measurements were registered. The effective renal plasma flow (ERPF), the glomerular filtration rate (GFR), angiotensin II, aldosterone, arginine vasopressin (AVP), atrial natriuretic peptide (ANP), endothelin and excretion of water and electrolytes were measured preoperatively, 1 h postoperatively and 24 h postoperatively.

MAIN RESULTS

During the operation the dopamine group had higher cardiac index and heart rate together with lower pulmonary artery wedge blood pressure. ERPF and GFR did not differ between the groups. In the dopamine group ERPF was increased in all patients at the first postoperative clearance. The fractional excretion of sodium, the per- and postoperative diuresis and AVP were increased in the dopamine group as compared to the placebo group. Postoperatively, ANP in the placebo group was raised as compared to the preoperative level.

CONCLUSIONS

Peroperatively, dopamine counteracted depression of left ventricular function. The increased ERPF at the first postoperative clearance in the dopamine group indicates either improved peroperative haemodynamics or a synergistic effect between dopamine and epidural sympathetic blockade. Dopamine also improved diuresis and natriuresis.