[Calcium and pregnancy induced hypertension].

In this paper the relationship between calcium and pregnancy induced hypertension (PIH) was prospectively studied. 150 normal pregnant women were divided into 3 groups: group A with supplement of calcium element 1g/day, group B 2g/day and group C with no calcium supplement. 8%, 4% and 18% of each group had developed PIH respectively. It seems that supplement of 2 gram calcium per day gave the best result. Furthermore the study was expanded: 200 cases with supplement of calcium element 2 g/day from 20-28th week of pregnancy, another 200 pregnant women without calcium supplement. The occurrence of PIH was 7.5% and 16.5% respectively. There was no adverse effect with 2 g calcium supplement. The metabolism of calcium in normal pregnancy and PIH was discussed. Supplement of calcium during pregnancy may benefit by reduction of PIH incidence.