The optimal gestational age to deliver patients with chronic hypertension on antihypertensive therapy.

Objective: To identify the optimal gestational age of planned delivery in pregnancies complicated by chronic hypertension requiring antihypertensive medications that minimizes the risk of adverse perinatal events and maternal morbidity.

Methods: Retrospective cohort study of singleton pregnancies after 37 weeks of gestation complicated by chronic hypertension on antihypertensive medication, delivered at 7 hospitals within an academic health system in New York from 12/1/2015 to 9/3/2020. Two comparisons were made (1) planned deliveries at 37-37weeks versus expectant management, (2) planned deliveries at 38-38weeks versus expectant management.