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Ann Thorac Surg 1990;50:387-391
© 1990 The Society of Thoracic Surgeons
a Institute for Experimental Medical Research and Surgical Department, Ullevaal Hospital, University of Oslo, Oslo, Norway
b Institute of Immunology and Rheumatology, The National Hospital, University of Oslo, Oslo, Norway
Accepted for publication March 26, 1990.
* Address reprint requests to Dr Videm, Institute for Experimental Medical Research, University of Oslo, Ullevaal Hospital, N-0407 Oslo 4 Norway.
Thirty-three patients admitted for coronary bypass grafting were randomized to cardiopulmonary bypass with a bubble oxygenator (Cobe or Polystan) or a membrane oxygenator (SciMed). Plasma concentrations of C3 activation products and the terminal complement complex were measured using enzyme immunoassays. Both variables increased almost linearly after onset of cardiopulmonary bypass, with maximal concentrations at clossure of the sternum. From a baseline of 7.5 to 12.0 arbitrary units (AU)/mL (medians), the concentrations of C3 activation products increased by 117.5 AU/mL (Cobe), 120.5 AU/mL (Polystan), and 213.3 AU/mL (SciMed). The increase in the membrane group was significantly higher than in the two bubble oxygenator groups (p < 0.01). From a baseline of 0.9 to 1.3 AU/mL, the concentrations of terminal complement complex increased by 5.4 AU/mL (Cobe), 6.6 AU/mL (Polystan), and 7.7 AU/mL (SciMed) (differences not significant). The higher C3 activation caused by the membrane oxygenator may be explained by differences in flow profile and surface area in contact with blood. The study cannot confirm the general assumption that membrane oxygenators lead to lower complement activation than do bubble oxygenators.
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