Antihypertensive prescribing patterns and hypertension control in females of childbearing age.

Purpose The use of angiotensin-converting enzyme (ACE) inhibitors or angiotensin receptor blockers (ARBs) to treat hypertension (HTN) during pregnancy presents well-established risks to a developing fetus. A cross-sectional study was conducted to evaluate the current state of antihypertensive prescribing and contraceptive use in females of childbearing age within a large safety-net health system. Methods The retrospective cross-sectional study of females aged 18-49 years with a documented diagnosis of HTN. The proportion of patients prescribed an ACE inhibitor or ARB and using a documented form of contraception was calculated. Documented forms of contraception included oral contraceptives, intrauterine devices, injections, implants, and surgical intervention. Results A total of 4,187 patients were identified from the HTN registry; after application of exclusion criteria 3,045 patients were included in the study population. The mean age was 39 years (range, 18-49 years). The most frequently prescribed classes of antihypertensive medications were ACE inhibitors and ARBs (one or the other was used by 1,146 patients [37.6%]), followed by thiazide diuretics (n = 710, 23.3%) and calcium channel blockers (n = 599, 19.7%). Of the 1,146 patients prescribed an ACE inhibitor or ARB, 553 (48%) were using a documented form of contraception. Conclusion Rates of ACE inhibitor or ARB prescribing to females of childbearing age were high despite the teratogenic risks, and fewer than half of patients had documented protection from pregnancy. Provider and patient education and potential creation of best practice alerts in the electronic medical record regarding the risks of using ACE inhibitors and ARBs in females of childbearing age are warranted.