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Seminars in Cardiothoracic and Vascular Anesthesia, Vol. 10, No. 2, 132-142 (2006)
DOI: 10.1177/1089253206288997

Aprotinin and the Protease-Activated Receptor 1 Thrombin Receptor: Antithrombosis, Inflammation, and Stroke Reduction

J. R. S. Day, MRCS

British Heart Foundation Cardiac Surgery Unit, Imperial College, London, United Kingdom, j.day{at}imperial.ac.uk

R. C. Landis, PhD

Edmund Cohen Laboratory for Vascular Research, Chronic Disease Research Centre, UWI, Bridgetown, Barbados

K. M. Taylor, MD

British Heart Foundation Cardiac Surgery Unit, Imperial College, London, United Kingdom

Cardiopulmonary bypass, although remaining an indispensable asset in cardiac surgery, especially in more complex and repeat operations, is associated with significant thrombin generation in the bypass circuit, leading to the activation of platelets, the coagulation system, an inflammatory response, and perioperative stroke. Recent clinical studies and meta-analyses of clinical trials in coronary artery bypass grafting surgery have confirmed that aprotinin not only reduces transfusion requirements in cardiac surgery but also confers significant protection against platelet dysfunction, activation of the systemic inflammatory response, and perioperative stroke when administered at the full (or "Hammersmith") dose. This article reviews research from several independent groups to propose a novel mechanism through which the antithrombotic, anti-inflammatory, and neuroprotective mechanism might be mediated, via protection of the high-affinity thrombin receptor protease-activated receptor 1 (PAR1).

Key Words: cardiopulmonary bypass • thrombin • antithrombosis • inflammation • stroke • PAR1


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[Abstract] [PDF]