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Canadian Journal of Anesthesia, Vol 29, 525-532, Copyright © 1982 by Canadian Anesthesiologists' Society

Haemodynamic and Plasma Vasopressin Responses with High-Dose Fentanyl Anaesthesia During Aorto-Coronary Bypass Operations

L. A. CRONE M.D.1, N. WILSON Ph.D.2, J. NGSEE M.Sc.2, K. W. TURNBULL M.D., F.R.C.P.(C)1, and K. LEIGHTON M.B., F.R.C.P.(C)3

1 Department of Anaesthesia, Vancouver General Hospital, Vancouver, B.C.
2 Department of Physiology, University of British Columbia, Vancouver, B.C.
3 Department of Anaesthesia, Health Sciences Centre Hospital, University of British Columbia, Vancouver, B.C.

Reprints: L.A. Crone, M.D., Department of Anaesthesia, University Hospital, Saskatoon, Saskatchewan S7N 0X0.

Twelve male patients were given high dose fentanyl (75-100 µg·kg-1) anaesthesia with oxygen during elective aorto-coronary bypass operations, and their haemodynamic and vasopressin responses were determined during induction, sternotomy, cardiopulmonary bypass, post-bypass and recovery periods. For comparison, a group of 12 male patients were anaesthetized with morphine, halothane 0.5 per cent, nitrous oxide and oxygen, and were similarly studied.

Significant alterations in haemodynamics included increased mean arterial pressure after sternotomy in the fentanyl group, increased heart rate in both groups, increased systemic vascular resistance after sternotomy only in the halothane group, and decreased left ventricular stroke work index in both groups following induction, bypass, and during the recovery periods.

Plasma vasopressin levels increased significantly in both groups during the bypass period, but returned to baseline levels following bypass. Serum sodium and osmolality did not change significantly, and urinary sodium and potassium excretion rose with the progress of the operation in both groups. A positive correlation was found between mean arterial pressure and vasopressin only in the halothane group. Systemic vascular resistance was correlated to vasopressin levels in both groups.

Vasopressin response in both groups was similar, with significant but relatively low increases in levels during cardiopulmonary bypass. Fentanyl-oxygen anaesthesia did not provide haemodynamic stability in eight of 12 patients.

Key Words: ANAESTHETICS, intravenous, fentanyl • HORMONES, vasopressin, antidiuretic hormone • SURGERY, aortocoronary bypass






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Copyright © 1982 by the Canadian Anesthesiologists' Society.