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J Thorac Cardiovasc Surg 1994;107:248-256
© 1994 Mosby, Inc.

CARDIOPULMONARY BYPASS, MYOCARDIAL MANAGEMENT, AND SUPPORT TECHNIQUES

Allopurinol pretreatment improves postoperative recovery and reduces lipid peroxidation in patients undergoing coronary artery bypass grafting

J. G. Coghlan, MB, MRCPIa, W. D. Flitter, PhDb, S. M. Clutton, BScb, R. Panda, MB, MS, MCha, R. Daly, MDa, G. Wright, MB, LRCP, FFAa, C. D. Ilsley, MB, MRCP, FRACPa, T. F. Slater, PhD, FIBiol, FRCSb{dagger}


Middlesex and Uxbridge, England

Sponsored by the British Heart Foundation.

Received for publication Dec. 2, 1992. Accepted for publication May 4, 1993. Address for reprints: J. G. Coghlan, MB, MRCP, Department of Cardiology, Harefield Hospital, Harefield, Middlesex UB9 6JY, England.

Abstract

In this prospective, randomized, double-blind, placebo-controlled study, the clinical, biochemical, and hemodynamic effects of xanthine oxidase inhibition in patients undergoing coronary artery bypass grafting were assessed. Allopurinol pretreatment significantly reduced the use of inotropic support after the operation (5 of 25 patients versus 13 of 25 patients, p < 0.01) and increased the rate of peripheral warming (11.4 ± 0.85 hours versus 14.4 ± 1 hours, p < 0.02). Twenty patients (9 in the allopurinol group and 11 in the placebo group) underwent invasive hemodynamic monitoring and intraoperative coronary sinus cannulation. The cardiac indexes of both groups were similar before the operation and for the first postoperative hour; thereafter, the cardiac index increased significantly in only the active treatment group (F = 3.33 and df = 5,90, p < 0.004). Products of lipid peroxidation (thiobarbituric acid reactive substances) increased significantly in only the placebo group, with increases being evident both in the systemic circulation (9.5 ± 3.2 nmol/gm albumin, p < 0.007, and 24 ± 5 nmol/gm albumin, p < 0.001, at 30 seconds and 2 minutes of reperfusion, respectively) and the coronary sinus (19.4 ± 5.8 nmol/gm albumin, p < 0.004, and 28 ± 4 nmol/gm albumin, p < 0.001, at 2 and 5 minutes of reperfusion, respectively. No significant difference was evident between the groups with respect to cardiac enzyme or vitamin E release. It is proposed that xanthine oxidase inhibition exerts its beneficial effects by reducing the level of free radical activity associated with reperfusion during coronary artery bypass grafting. (J THORAC CARDIOVASC SURG 1994;107:248-56)




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