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Ann Thorac Surg 1995;59:137-143
© 1995 The Society of Thoracic Surgeons

Normothermia Versus Hypothermia During Cardiopulmonary Bypass: A Randomized, Controlled Trial

Martin Tönz, MD, Tomislav Mihaljevic, MD, Ludwig K. von Segesser, MD, Edith R. Schmid, MD, Helen I. Joller-Jemelka, MD, Patrick Pei, PhD, Marko I. Turina, MD

Clinic for Cardiovascular Surgery, Institute of Anaesthesiology, Institute of Clinical Immunology, and Institute for Clinical Chemistry, University Hospital, Zurich, Switzerland

Accepted for publication July 22, 1994.

To evaluate the influence of perfusion temperature on systemic effects of cardiopulmonary bypass (CPB), 30 patients undergoing elective coronary artery bypass grafting were randomly assigned to either normothermic (warm, n = 14, 36°C) or hypothermic (cold, n = 16, 28°C) CPB. Serial hemodynamic measurements and blood samples were obtained before, during and after the CPB procedure. During CPB, there were no differences between both groups in the need for vasopressors (norepinephrine, phenylephrine), urinary output, or fluid balance. In the early postoperative period, normothermic CPB patients had significantly lower systemic vascular resistance and higher cardiac index measurements (mean ± standard error: systemic vascular resistance, 880 ± 27 versus 1,060 ± 57 dyne • s • cm-5, p = 0.025; cardiac index, 3.6 ± 0.1 versus 2.9 ± 0.1 L • min-1 • m-2, p = 0.01) without differences in the administration of vasoactive drugs. Blood loss was significantly higher in patients after hypothermic CPB (median [range] body surface area: 370 [180–560] versus 490 [280–2,120] mL/m2, p = 0.0006), with a greater need for transfusion of erythrocytes and fresh frozen plasma. Plasma levels of tumor necrosis factor and soluble tumor necrosis factor receptors increased during and after CPB, independent of perfusion temperature. This study suggests a significant influence of CPB temperature and respective perfusion management on postoperative hemodynamics and blood loss. Normothermic CPB is not associated with additional systemic adverse effects.




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