Adverse pregnancy outcomes and later cardiovascular disease

CVD prevention—American Heart Association recommendations

The American Heart Association¹² recommends lifestyle interventions to reduce the risk of CVD, including:

• Eat a high-quality diet that includes vegetables, fruit, whole grains, beans, legumes, nuts, plant-based protein, lean animal protein, and fish.
• Limit intake of sugary drinks and foods, fatty or processed meats, full-fat dairy products, eggs, highly processed foods, and tropical oils.
• Exercise at least 150 minutes weekly at a moderate activity level, including muscle-strengthening activity.
• Reduce prolonged intervals of sitting.
• Live a tobacco- and nicotine-free life.
• Strive to maintain a normal body mass index.
• Consider using an activity tracker to monitor activity level.
• After 40 years of age calculate CVD risk using a validated calculator such as the American Cardiology Association risk calculator.¹³ This calculator uses age, gender, and lipid and blood pressure measurements to calculate the 10-year risk of atherosclerotic CVD, including coronary death, myocardial infarction, and stroke.

Medications to reduce CVD risk

Historically, ObGyns have not routinely prescribed medications to treat hypertension, dyslipidemia, or to prevent diabetes. The recent increase in the valuation of return ambulatory visits and a reduction in the valuation assigned to procedural care may provide ObGyn practices the additional resources needed to manage some chronic diseases. Physician assistants and nurse practitioners may help ObGyn practices to manage hypertension, dyslipidemia, and prediabetes.

Prior to initiating a medicine, counseling about healthy living, including smoking cessation, exercise, heart-healthy diet, and achieving an optimal body mass index is warranted.

For treatment of stage II hypertension, defined as blood pressure (BP) measurements with systolic BP ≥140 mm Hg and diastolic BP ≥90 mm Hg, therapeutic lifestyle interventions include: optimizing weight, following the DASH diet, restricting dietary sodium, physical activity, and reducing alcohol consumption. Medication treatment for essential hypertension is guided by the magnitude of BP reduction needed to achieve normotension. For women with hypertension needing antihypertensive medication and planning another pregnancy in the near future, labetalol or extended-release nifedipine may be first-line medications. For women who have completed their families or who have no immediate plans for pregnancy, an angiotensin-converting enzyme inhibitor, angiotensin receptor blocker, calcium channel blocker, or thiazide diuretic are commonly prescribed.¹⁴

For the treatment of elevated low-density lipoprotein (LDL) cholesterol in women who have not had a cardiovascular event, statin therapy is often warranted when both the LDL cholesterol is >100 mg/dL and the woman has a calculated 10-year risk of >10% for a cardiovascular event using the American Heart Association or American College of Cardiology calculator. Most women who meet these criteria will be older than age 40 years and many will be under the care of an internal medicine or family medicine specialist, limiting the role of the ObGyn.^15-17

For prevention of diabetes in women with a history of GDM, both weight loss and metformin (1,750 mg daily) have been shown in clinical trials to reduce the risk of developing T2DM.¹⁸ Among 350 women with a history of GDM who were followed for 10 years, metformin 850 mg twice daily reduced the risk of developing T2DM by 40% compared with placebo.¹⁹ In the same study, lifestyle changes without metformin, including loss of 7% of body weight plus 150 minutes of exercise weekly was associated with a 35% reduction in the risk of developing T2DM.¹⁹ Metformin is one of the least expensive prescription medications and is cost-effective for the prevention of T2DM.¹⁸

Low-dose aspirin treatment for the prevention of CVD in women who have not had a cardiovascular event must balance a modest reduction in cardiovascular events with a small increased risk of bleeding events. The US Preventive Services Task Force (USPSTF) recommends low-dose aspirin for a limited group of women, those aged 50 to 59 years of age with a 10-year risk of a cardiovascular event >10% who are willing to take aspirin for 10 years. The USPSTF concluded that there is insufficient evidence to recommend low-dose aspirin prevention of CVD in women aged <50 years.²⁰

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