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The effect of protamine sulfate on platelet function.

B Lindblad¹, T W Wakefield, W M Whitehouse

¹Department of Surgery, University of Michigan Medical School, Ann Arbor.

Scandinavian Journal of Thoracic and Cardiovascular Surgery

|January 1, 1988

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Protamine sulfate, used to reverse heparin, can cause adverse effects. This study found protamine inhibits thrombin-induced platelet aggregation, suggesting platelets play a role in protamine

Area of Science:

Cardiovascular Pharmacology
Hematology
Pharmacology

Background:

Protamine sulfate is crucial for neutralizing heparin's anticoagulant effects.
Adverse reactions to protamine sulfate include hypotension, pulmonary hypertension, thrombocytopenia, and leukopenia.
The precise mechanism of protamine's adverse effects requires further investigation.

Purpose of the Study:

To investigate the mechanism of protamine sulfate's adverse effects.
To evaluate the interaction between protamine sulfate and platelets.
To determine the role of platelets in protamine-induced hemodynamic changes.

Main Methods:

Preparation of platelet-rich plasma (PRP) from canine and human blood samples.
Assessment of platelet aggregation induced by adenosine diphosphate and thrombin.

Related Experiment Videos

Induction of thrombocytopenia in splenectomized dogs followed by protamine administration.

Monitoring of systemic and pulmonary arterial pressures.

Main Results:

Protamine sulfate inhibited thrombin-induced platelet aggregation in both canine and human PRP (p < 0.05).
Adenosine diphosphate-induced platelet aggregation remained unchanged.
Protamine administration in thrombocytopenic dogs caused systemic hypotension but not pulmonary hypertension.
Leukopenia preceded the development of further thrombocytopenia.

Conclusions:

Protamine-platelet interactions inhibit thrombin-induced platelet aggregation.
Platelets may contribute to pulmonary pressure changes during protamine reversal.
Protamine-induced systemic hypotension is not mediated by platelets.