[Importance of the determination of mean blood pressure values in the 2d trimester of pregnancy for the early detection of pregnancy toxemias].

In 240 pregnant women the blood pressure mean value in the second trimester of pregnancy was determined after the method of Page and Christianson; in 40% the value was 11.3 kPa or higher, and 90% of all later manifest hypertensions in pregnancy came from this group. In 17% of pregnant women the blood pressure mean value exceeded 12 kPa and this group contained 63.2% of all later manifest hypertensions in pregnancy--among them 6 out of a total of 7 severe or very severe cases of hypertension.