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Related Experiment Videos

Aprotinin in perspective

S Westaby1

  • 1Department of Cardiac Surgery, Oxford Heart Centre, John Radcliffe Hospital, England.

The Annals of Thoracic Surgery
|April 1, 1993
PubMed
Summary

Aprotinin protects platelet function during cardiopulmonary bypass, significantly reducing blood loss. This protease inhibitor prevents contact activation, preserving platelet receptors and improving hemostasis.

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Area of Science:

  • Pharmacology
  • Biochemistry
  • Cardiovascular Surgery

Background:

  • Aprotinin, a serine protease inhibitor from bovine lung, was initially used to inhibit complement activation during cardiopulmonary bypass.
  • Unexpectedly, aprotinin significantly reduced blood loss and transfusion requirements in patients undergoing cardiac surgery.
  • Further research indicated that aprotinin improves hemostasis by protecting platelet adhesive receptors (Gp Ib) during cardiopulmonary bypass.

Purpose of the Study:

  • To investigate the mechanism by which aprotinin reduces blood loss during cardiopulmonary bypass.
  • To elucidate aprotinin's role in preventing contact system activation and preserving platelet function.
  • To compare the efficacy of low-dose versus high-dose aprotinin therapy in maintaining hemostasis.

Main Methods:

  • Investigated the effects of aprotinin on plasma contact system activation during cardiopulmonary bypass.
  • Assessed the impact of aprotinin on platelet adhesive receptors (Gp Ib) and thrombin formation.
  • Compared hemostatic effects of low-dose (pump prime) versus continuous high-dose aprotinin infusion.

Main Results:

  • Aprotinin blocks contact activation of the kallikrein system and, with heparin, prevents thrombin formation by inhibiting the intrinsic clotting cascade.
  • Aprotinin preserves platelet Gp Ib receptors, mitigating impairment of platelet adhesive function caused by thrombin.
  • Low-dose aprotinin (2 x 10(6) KIU) demonstrated equivalent blood loss reduction and Gp Ib receptor preservation as continuous high-dose infusion (6 x 10(6) KIU).

Conclusions:

  • Aprotinin effectively prevents contact activation and preserves platelet function during cardiopulmonary bypass, leading to reduced blood loss.
  • The hemostatic benefits are achieved early in cardiopulmonary bypass, with low-dose therapy being as effective as high-dose infusion.
  • Aprotinin's interaction with heparin prolongs clotting times, necessitating careful heparin dosage adjustments. Potential effects on endothelial cell anticoagulant function warrant consideration during specific surgical conditions.

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