Pregnancy in Alström Syndrome: Cardiac and Metabolic Risks

Pregnancy in women with Alström Syndrome is uncommon but possible. The cardiac, metabolic, and obstetric considerations are significant and warrant careful preconception planning with a multidisciplinary team. This article covers what's known about pregnancy in Alström, the specific risks, and how care typically unfolds when a woman with Alström is pregnant or considering pregnancy.

Several factors limit pregnancy in women with Alström:

• Hypogonadism is common, often with delayed or arrested puberty
• Polycystic ovary syndrome and irregular menstrual cycles are common
• Type 2 diabetes can complicate fertility
• Cardiomyopathy can complicate the cardiovascular demands of pregnancy

Despite these factors, women with Alström have had successful pregnancies and deliveries.¹ Outcomes are best with thorough planning and a multidisciplinary care team.

The single most important step is meeting with your medical team before pregnancy. Discussions should include:

Cardiac assessment

• Current heart function — echocardiogram, EKG, possibly cardiopulmonary exercise testing
• Medications — some heart medications (ACE inhibitors, ARBs, sacubitril/valsartan) are unsafe in pregnancy and need to be changed before conception
• Risk stratification — pregnancy puts substantial strain on the heart, and some cardiac conditions warrant counseling about pregnancy risk
• Plan for monitoring during pregnancy

Metabolic optimization

• Diabetes control — pre-pregnancy HbA1c ideally <6.5–7%, with stable insulin or other medications
• Weight optimization where feasible
• Lipid management
• Thyroid function

Genetic counseling

• Recurrence risk for the baby (covered in our genetic counseling article)
• Carrier testing for the partner — if the partner is a non-carrier, all children will be carriers; if the partner is also a carrier, recurrence risk is 25%
• Prenatal testing options

Other organ assessment

• Kidney function
• Liver function
• Sleep apnea status (CPAP optimization)
• Vision and hearing baseline

Mental health and family support

• Discussion of the demands of pregnancy and parenthood with Alström
• Identifying family or community support
• Mental health screening and access to support

Several common Alström medications need adjustment:

Cardiac medications to change

• ACE inhibitors and ARBs are teratogenic — contraindicated during pregnancy. Replaced with beta-blockers (often labetalol) and other pregnancy-safe agents.
• Sacubitril/valsartan — contraindicated during pregnancy
• Some statins — typically discontinued during pregnancy

Diabetes medications

• Metformin — generally considered acceptable during pregnancy
• Insulin — the safest choice for diabetes management in pregnancy
• GLP-1 agonists, SGLT2 inhibitors — typically discontinued during pregnancy
• Sulfonylureas — alternative choices used selectively

Other considerations

• Spironolactone — typically avoided in pregnancy
• Thyroid medications — generally continued; doses often need adjustment

A specialist team helps with these transitions ideally before conception.

For women with Alström, pregnancy is high-risk and warrants:

Frequent multidisciplinary visits

• High-risk obstetrics (maternal-fetal medicine)
• Cardiology — typically monthly echocardiograms during pregnancy
• Endocrinology — diabetes is harder to control during pregnancy
• Other specialists as relevant (nephrology, hepatology)

Cardiac monitoring during pregnancy

The volume changes of pregnancy, the increased cardiac output, and the hemodynamic stress of labor can decompensate cardiac function. Monitoring includes:

• Symptom assessment at every visit
• Monthly or more frequent echocardiograms
• BNP testing
• Plan for delivery setting

Diabetes management

Insulin requirements often increase substantially during pregnancy due to placental hormones. Tight glucose control protects the baby and the mother.

Delivery planning

Decisions about timing and mode of delivery (vaginal vs cesarean) depend on cardiac status, obstetric factors, and team consensus. Delivery should be at a center with cardiac and high-risk obstetric expertise.

The postpartum period brings significant cardiovascular changes as fluid shifts back from the placenta. This is a high-risk window for cardiac decompensation, particularly in the first weeks. Planning includes:

• Close cardiac monitoring postpartum
• Resumption of heart medications (some that were held during pregnancy can restart)
• Breastfeeding considerations — some medications are compatible, others not
• Mental health support — postpartum depression risk is elevated in any high-risk pregnancy

Men with Alström often have hypogonadism that affects fertility. Some men with Alström have fathered children, sometimes with assisted reproductive technology. Genetic counseling pre-conception is recommended; the children of a man with Alström are obligate carriers (assuming the partner is not also a carrier).

For couples who decide pregnancy isn't right for them, adoption and surrogacy are paths some have taken. Each has its own legal, financial, and emotional landscape. Patient organizations and rare-disease networks sometimes have peer connections among families who've taken these paths.

• Hypogonadism and Puberty in Alström Syndrome
• Type 2 Diabetes in Alström Syndrome
• Adolescent and Adult Heart Disease in Alström Syndrome
• Family Planning Options When You're an Alström Carrier
• Genetic Counseling for Alström Syndrome Families

April 30, 2026.