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Ann Thorac Surg 1982;34:204-206
© 1982 The Society of Thoracic Surgeons

Articles

Platelet Aggregation during and after Cardiopulmonary Bypass: Effect of Two Different Cardiotomy Filters

J. Anthony Ware, M.D., Michael A. Scott, B.S., Janet K. Horak, M.T., R. Thomas Solis, M.D.*

From the Pulmonary Disease Sections of St. Luke's Episcopal and The Methodist Hospitals, The Texas Heart Institute, and the Department of Internal Medicine, Baylor College of Medicine, Houston, TX

Accepted for publication September 4, 1981.

* Address reprint requests to Dr. Solis, Pulmonary Research Laboratory, St. Luke's Episcopal Hospital, 6720 Bertner Ave, Houston, TX 77030

Patients undergoing cardiopulmonary bypass with a membrane oxygenator were studied to determine the effects of two cardiotomy filters on platelet number and function. A Dacron wool filter removed significantly more microemboli than a 40 µ x 40 µ pore-mesh filter. Postoperatively, there were fewer platelets and a lower total volume of platelets in patients who had a Dacron wool filter in the extracorporeal circuit. However, the volume of adenosine diphosphate-induced aggregates was nearly identical in the two patient groups (p > 0.1). The study documents an increased number of circulating platelets after pore-mesh filtration, and suggests that the microaggregates reinfused during pore-mesh filtration represent aggregated platelets that dissociate and subsequently circulate in the patient but do not function.




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