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Hormonal contraception linked to blood clots

(no author information available yet)
(1) The precise cardiovascular risk of oral contraceptives is poorly known because of a lack of reliable clinical studies and the numerous potential biases in epidemiological studies. (2) The absolute risk of coronary events is very low in women under 35 who are non smokers, have no history of coronary heart disease and have normal blood pressure. In women over 35, smoking over 10 cigarettes a day and arterial hypertension substantially increase the risk of coronary heart disease. (3) The absolute risk of stroke is low in young women who are not hypertensive and do not smoke...
August 1998: Prescrire International
E M Gordon, O D Ratnoff, P K Jones
Spontaneous shortening of the Thrombotest time and an increase in factor VII activity after cold storage of plasma in plastic vials have been described in the plasma of women using OCAs. The phenomenon if CPA is dependent on the presence of HF (factor XII) and is associated with increased plasma kallikrein activity and the disappearance of C1-INH activity. In the present study, spontaneous CPA and shortening of the prothrombin time were observed in 66% of women using OCAs. The prothrombin time was inversely related to factor VII activity and HF coagulant titer, whereas factor VII activity was strongly associated with the titer of HF...
March 1982: Journal of Laboratory and Clinical Medicine
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