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Racial differences in ristocetin-induced platelet aggregation

G R Buchanan, C A Holtkamp, E N Levy

British Journal of Haematology

|November 1, 1981

Summary

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Reduced ristocetin-induced platelet aggregation (RIPA) is common in Black individuals and not linked to sickle cell trait. This difference in platelet function appears to be caused by a plasma inhibitor.

Area of Science:

Hematology
Clinical Pathology
Platelet Physiology

Background:

Previous studies noted defective ristocetin-induced platelet aggregation (RIPA) in sickle cell trait carriers.
The racial demographics of control groups in prior RIPA research were often unstated.
Investigating racial differences in RIPA is crucial for understanding platelet function variations.

Purpose of the Study:

To examine maximal amplitude of RIPA across different racial groups (White and Black individuals).
To determine if sickle haemoglobin presence influences RIPA.
To identify potential factors contributing to observed differences in RIPA.

Main Methods:

Maximal amplitude of RIPA was measured in 75 normal White and Black subjects.
Subjects included individuals with and without sickle trait, confirmed by electrophoresis.

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RIPA was assessed at three final ristocetin concentrations: 1.1, 1.2, and 1.5 mg/ml.

Main Results:

Significantly lower mean RIPA in Black subjects (31%) compared to White subjects (72%) at 1.1 mg/ml ristocetin (P < 0.001).
60% of Black individuals exhibited <50% RIPA versus 11% of White individuals at 1.1 mg/ml.
Reduced RIPA in Black individuals was not explained by age, sex, sickle haemoglobin, or medications; plasma from these individuals inhibited normal RIPA.

Conclusions:

Reduced RIPA at low ristocetin concentrations is a common finding in Black individuals.
This phenomenon is independent of sickle haemoglobin presence.
A plasma inhibitor affecting RIPA appears to be responsible for the observed racial differences.