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Ann Thorac Surg 1999;67:711-715
© 1999 The Society of Thoracic Surgeons
a Department of Anesthesiology, Mayo Clinic, Rochester, Minnesota, USA
b Department of Surgery, Mayo Clinic, Rochester, Minnesota, USA
c Department of Biostatistics, Mayo Clinic, Rochester, Minnesota, USA
Accepted for publication September 3, 1998.
Address reprint requests to Dr Stensrud, Department of Anesthesiology, Mayo Clinic, Rochester, MN 55905
e-mail: stensrud.paul{at}mayo.edu
Background. We hypothesized that normothermic cardiopulmonary bypass (CPB) would be associated with decreased blood loss and allogeneic transfusion requirements relative to hypothermic CPB.
Methods. After obtaining institutional review board approval and informed patient consent, we conducted a prospective, randomized study of 79 patients undergoing CPB for a primary cardiac operation at normothermic (37°C) (n = 44) or hypothermic temperature (25°C) (n = 35). Blood loss and transfusion requirements in the operating room and for the first 24 hours in the intensive care unit were determined. A paired t test and rank sum tests were used. A p value of less than 0.05 was considered significant.
Results. The normothermic and hypothermic CPB groups did not differ in demographic variables, CPB or cross-clamp duration, heparin sodium or protamine sulfate dose, prothrombin time, or thromboelastogram results. There were no differences between the two CPB groups in blood loss or transfusion requirements.
Conclusions. We found that when there was no difference in duration of CPB, normothermic and hypothermic CPB groups demonstrated similar blood loss and transfusion requirements even though other studies have shown hypothermia induces platelet dysfunction and alters the activity of the coagulation cascade.
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