Circulating Platelet Aggregates in Normal Pregnancy and Rpeeclampsia
Circulating platelet aggregates have been observed in various thromboembolic states. It is known that severe preeclamsia is associated with features of intravascular coagulation. To evaluate the role of platelets in this disorder we have determined circulating platelet aggregates in 10 patients with severe preeclampsia, in 30 patients in the third trimester of uncomplicated pregnancies and in 35 healthy nonpregnant volunteers. Platelet aggregate ratio /P.A.R./ was measured by a modification of a method described by Wu and Hoak, The mean P.A.R. of severe preeclamptic patients /0.732 ± 0,063 SEM/ was significantly lower than that of the uncomplicated pregnant women /0,860 ± 0,052 SEM/ and of the nonpregnant volunteers /0.880 ± 0,061 SEM/.The results indicate that severe preeclamptic patients have increased levels of circulating platelet aggregates and platelet activation is a feature of preeclampsia.