Conservative treatment of mild and moderate hypertension in pregnancy.

In a prospective study regarding conservative treatment of mild to moderate hypertension in pregnancy 5244 women were evaluated at delivery. Two hundred and fifty-eight (4.9%) were registered as hypertensive during pregnancy with a blood pressure (BP) greater than or equal to 140/90 mmHg. One hundred and ninety-six of these continued their pregnancy without medication and 96/196 were defined as preeclamptic (PE), 45/196 as chronic hypertensive (CH), and 55/196 as having gestational hypertension (GH). In 62/258 women antihypertensive treatment was initiated in the mean 6.5 (+/- 8.7) days after onset of hypertension, due to a BP greater than or equal to 150/100 mmHg. There was a later onset of hypertension in the untreated group, and BP at delivery differed in the untreated groups (p less than 0.001) with the lowest BP in women with mild GH. There was no difference in cesarean section rate in the mild hypertensive group as compared to the normal population. Birth weight and length of pregnancy were significantly lower in the untreated mild hypertensive group as compared to normal pregnant women (p less than 0.05). But in the subgroup with mild GH pregnancy length and birth weight did not differ from normal pregnancy. The conclusion from our study is that women with mild hypertension in pregnancy might refrain from antihypertensive therapy if they are closely observed during pregnancy and delivery, especially if there has been no hypertension before pregnancy and no proteinuria develops.