Racial differences in ristocetin-induced platelet aggregation

British Journal of Haematology
G R BuchananE N Levy

Abstract

Several investigators have reported defective ristocetin-induced platelet aggregation (RIPA) in individuals whose red blood cells contain sickle haemoglobin, but the race of control subjects in these studies was not stated. Therefore, maximal amplitude of RIPA was examined in 75 normal whites and blacks, of 16 of whom had sickle trait defined by haemoglobin electrophoresis and sickle prep. Final ristocetin concentrations in platelet rich plasma were 1.1, 1.2 and 1.5 mg/ml. Mean aggregation at 1.1 mg/ml was significantly less in blacks (mean 31%) than in whites (mean 72%) (P less than 0.001). 60% of blacks but only 11% of whites had less than 50% RIPA at 1.1 mg/ml. RIPA was entirely absent in 19% of blacks. Differences in RIPA between black and white subjects were also present at ristocetin concentrations of 1.2 and 1.5 mg/ml but were less striking. RIPA in 25 children with homozygous sickle cell anaemia was similar to that in the normal AA and AS blacks. Differences in RIPA could not be explained by age, sex, presence of sickle haemoglobin, or medications. Addition of normal plasma or platelets did not correct reduced RIPA in seven blacks, and their plasma inhibited normal RIPA responses. Reduced platelet aggregation to low con...Continue Reading

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Citations

Aug 22, 2009·Journal of Thrombosis and Haemostasis : JTH·V H FloodR R Montgomery
Nov 3, 2010·Haemophilia : the Official Journal of the World Federation of Hemophilia·C H MillerR Kulkarni
Jan 26, 2013·Experimental Hematology & Oncology·Lawrence S AmesseJames A French
Oct 3, 2003·Journal of Thrombosis and Haemostasis : JTH·C H MillerB Evatt
Nov 1, 1987·American Journal of Physical Anthropology·A P Polednak
Jul 23, 2003·Journal of Thrombosis and Haemostasis : JTH·C S PhilippP Saidi

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