Platelet survival and the development of coronary artery disease in the young adult: effects of cigarette smoking, strong family history and medical therapy.

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Abstract
Cigarette smoking or a strong family history of coronary disease was present in 46 of 50 symptomatic patients with coronary artery disease who were younger than 50 years of age. We recorded a shortened platelet survival half-life (less than 92 hours) with 51Cr in 60% of these patients, in 56% of apparently normal persons of the same age who smoked or had a strong family history of coronary disease, and in only 14% of normal persons who did not smoke and had no family history (p less than 0.01). Lengthening of the shortened platelet survival toward normal occurred in coronary patients given dipyridamole plus aspirin and in apparently normal smokers who discontinued smoking (p less than 0.01). The study suggests a possible relationship among cigarette smoking, strong family history of coronary disease and platelet activation in the process of coronary atherogenesis in the young adult.

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