Hypertension Clinical Trial
Official title:
A Pragmatic Multicenter Randomized Clinical Trial (RCT) of Antihypertensive Therapy for Mild Chronic Hypertension During Pregnancy: Chronic Hypertension and Pregnancy (CHAP) Project
The purpose of this study is to evaluate whether a blood pressure treatment strategy during pregnancy to achieve targets that are recommended for non-pregnant reproductive-age adults (<140/90 mmHg) compared ACOG- recommended standard during pregnancy (no treatment unless BP is severe) is effective and safe.
During pregnancy, chronic hypertension (CHTN) is the most common major medical disorder encountered, occurring in 2-6%. The substantial negative effect of CHTN on pregnancy includes a consistent 3- to 5-fold increase in superimposed preeclampsia and adverse perinatal outcomes (fetal or neonatal death, preterm birth -PTB, poor fetal growth and placental abruption) and possibly a 5- to10-fold increase in maternal cardiovascular and other complications (death, cerebrovascular accident, pulmonary edema and acute renal failure). Mild CHTN (BP <160/110) contributes to a large proportion of these adverse outcomes. While antihypertensive treatment of CHTN is standard for the general population, it is uncertain whether treatment during pregnancy reduces maternal or fetal complications, and there are concerns that decreased arterial pressure may reduce fetal blood flow and cause poor fetal growth or small-for-gestational-age (SGA) infants. Some authorities, including the American College of Obstetricians and Gynecologists (ACOG) and American Society of Hypertension (ASH) recommend withholding antihypertensive therapy for mild CHTN, particularly if BP is <160/105-110 mmHg. The recommendation to withhold antihypertensive treatment in pregnancy conflicts with the broader public health goal to reduce BP in those with CHTN and there is no evidence that discontinuing therapy during the brief period of pregnancy affects maternal outcomes (other than reducing the severe hypertension). For over a decade, authorities have consistently called for well-designed and powered trials to delineate the benefits and risks of pharmacologic therapy for CHTN during pregnancy. Therefore, our multicenter consortium proposes the Chronic Hypertension and Pregnancy (CHAP) Project, a large pragmatic randomized trial with a primary aim to evaluate the benefits and harms of pharmacologic treatment of mild CHTN in pregnancy. ;
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