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(Circulation. 1995;92:2276-2283.)
© 1995 American Heart Association, Inc.

Articles

Neutrophil Sequestration and Pulmonary Dysfunction in a Canine Model of Open Heart Surgery With Cardiopulmonary Bypass

Evidence for a CD18-Dependent Mechanism

William J. Dreyer, MD; Lloyd H. Michael, PhD; Ellen E. Millman, MS; Kurt L. Berens, BA; Robert S. Geske, BA

From the Lillie Frank Abercrombie Section of Cardiology (W.J.D.), the Speros P. Martel Section of Leukocyte Biology and Inflammation Research (W.J.D., E.E.M., K.L.B.), the Department of Pediatrics, Section of Cardiovascular Sciences (W.J.D., L.H.M.), the Department of Medicine and the Center for Comparative Medicine (R.S.G.), Baylor College of Medicine, Houston, Tex.

Correspondence to William J. Dreyer, MD, Pediatric Cardiology, Texas Children's Hospital, 6621 Fannin, Houston, TX 77030.

Background Previous studies documented an inflammatory reaction to cardiopulmonary bypass with neutrophil (PMN) sequestration in the lungs, contributing to microvascular injury and postoperative pulmonary dysfunction. This study explored the hypothesis that the ß₂ integrin CD18, a leukocyte adhesion molecule, mediates this response.

Methods and Results Fifteen adult, mixed-breed dogs underwent 90 minutes of cardiopulmonary bypass with 3 hours of subsequent recovery. Seven additional dogs were treated before cardiopulmonary bypass with a 1-mg/kg IV bolus of R15.7 IgG, a monoclonal antibody to CD18. Both groups were compared with 5 sham bypass control dogs. Bypassed dogs demonstrated an increased number of PMNs sequestered in the lungs 3 hours after bypass compared with sham bypass control dogs (1466±75 versus 516±43 PMN/mm² alveolar surface area, mean±SEM, P<.001). Also, when PMNs from bypass dogs were compared with those from sham dogs, they produced more H₂O₂ (305±45 versus 144±48 amol H₂O₂ per phagocyte per 20 minutes, P<.05). Bypass dogs had significantly decreased arterial oxygenation 3 hours after the procedure compared with shams (457±20 versus 246±49 mm Hg, P<.05), and they had a significantly increased lung wet-to-dry weight ratio (5.38±0.14 versus 4.54±0.15, P=.003), demonstrating a significant increase in lung water. R15.7 markedly attenuated pulmonary PMN accumulation in bypass dogs (412±73 PMN/mm², P<.001) and significantly inhibited PMN production of H₂O₂ (146±18 amol H₂O₂ per phagocyte per 20 minutes, P<.05) Bypass dogs pretreated with R15.7 also had improved oxygenation (445±28 mm Hg, P<.05) and tended to have less lung water accumulation after bypass (4.99±0.20).

Conclusions Pulmonary dysfunction after cardiopulmonary bypass is caused, at least in part, by a neutrophil-mediated, CD18-dependent mechanism.

Key Words: leukocytes • lung • cardiopulmonary bypass • antibodies

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