Abstract
We studied ADP-induced platelet aggregation, associated thromboxane B2 (TXB2) formation, urinary excretion of the prostacyclin metabolite 2,3-dinor-6-keto prostaglandin F1 alpha (2,3-dinor-6-keto PGF1 alpha) and formation of malondialdehyde in 10 healthy volunteers after ingestion of a small dose of ethanol (0.25 g per kg of body weight) and calcium carbimide (50 mg). Platelet aggregation in platelet-rich plasma (PRP) was suppressed (p less than 0.05) by ethanol, but no change occurred in platelet TXB2 formation. Ingestion of calcium carbimide caused significant elevations in blood acetaldehyde (p less than 0.001) and ethanol (p less than 0.05) levels, but acetaldehyde did not influence platelet aggregability or the aggregation-associated TXB2 formation. However, calcium carbimide per se significantly (p less than 0.05) elevated TXB2 formation. No effects were found on plasma malondialdehyde levels and urinary excretion of 2,3-dinor-6-keto PGF1 alpha. These observations indicate that a small dose of ethanol attenuates platelet aggregation without any significant effect on aggregation-associated TXB2 formation. By contrast, ingestion of calcium carbimide per se may enhance TXB2 formation.
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