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J Thorac Cardiovasc Surg 1996;111:637-641
© 1996 Mosby, Inc.

CARDIOPULMONARY BYPASS, MYOCARDIAL MANAGEMENT, AND SUPPORT TECHNIQUES

THE BENEFITS OF ACTIVE REWARMING AFTER CARDIAC OPERATIONS: A RANDOMIZED PROSPECTIVE TRIAL

Received for publication Dec. 23, 1994 Accepted for publication May 31, 1995. Address for reprints: V. Pathi, MD, Department of Cardiac Surgery, Western Infirmary Glasgow, Dumbarton Rd., G11 6NT Glasgow, Scotland.

Abstract

We conducted a prospective, randomized trial of three methods of rewarming patients after hypothermic cardiopulmonary bypass. Patients underwent either coronary artery bypass grafting or first-time valve replacement and were cooled to 32º C during bypass. No significant differences existed among the groups as regards operative or preoperative parameters including hemodynamics and blood use. The patients actively warmed with a convective (Bair Hugger system, 3 hours) or a conductive blanket (electric overblanket, 4 hours) reached normothermia more quickly than those warmed with the space blanket (7 hours). This was reflected in significantly earlier extubation in the former two groups: Bair Hugger system 10.8 ± 0.6 hours, electric blanket 11.3 ± 1.0 hours, and space blanket 14.8 ± 0.8 hours. Patients warmed with the space blanket required a higher dosage of morphine over the first 12 hours than those warmed with the electric blanket (10.4 vs 6.5 mg; p = 0.004), which may account for some of the differences between these two groups. No differences could be demonstrated between the two active blankets. On economic grounds we therefore recommend the reusable electric blanket for routine use. (J THORACCARDIOVASCSURG1996;111:637-41)

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