Peripartum Cardiomyopathy

Overview

Peripartum cardiomyopathy is a rare form of heart muscle disease that develops in the final month of pregnancy or within the first five months after delivery. The heart may enlarge and its pumping function can decline. It can occur in women with no prior history of heart disease.

Although uncommon, peripartum cardiomyopathy is a serious cardiac condition directly linked to pregnancy and childbirth. Its symptoms can be mistaken for normal pregnancy-related discomforts, which can delay diagnosis. For this reason, breathlessness, extreme fatigue, or leg swelling that develops in late pregnancy or after delivery should always be medically evaluated rather than attributed to the demands of new motherhood.

The outlook for many women with peripartum cardiomyopathy is encouraging. With appropriate treatment, heart function returns to near-normal levels within six to twelve months in a meaningful proportion of cases. Early diagnosis and consistent treatment are the most important factors in achieving this recovery.

Symptoms

The symptoms of peripartum cardiomyopathy can overlap with the expected discomforts of late pregnancy and the postpartum period, making them easy to overlook. However, when symptoms are more severe than expected or arise in a concerning pattern, they should be evaluated promptly.

• Shortness of breath. This is one of the most common symptoms. It may initially appear only during exertion, such as climbing stairs or walking. Over time, breathlessness can occur at rest or when lying flat. Waking from sleep unable to breathe comfortably, or needing to prop up with pillows, may be a sign that warrants attention.
• Extreme fatigue and weakness. Some degree of tiredness is expected after delivery, but a level of exhaustion that does not improve with rest and feels far beyond what is typical may be a warning sign.
• Swelling in the legs and ankles. Swelling is common in late pregnancy, but swelling that appears more pronounced than expected or develops rapidly after delivery may warrant evaluation.
• Palpitations or irregular heartbeat. The heart may feel as though it is racing, fluttering, or beating out of rhythm.
• Cough. A dry cough that worsens when lying flat may indicate fluid accumulating in the lungs.
• Dizziness or lightheadedness. A feeling of unsteadiness or dizziness may occasionally occur.
• Abdominal discomfort. A feeling of fullness or bloating in the abdominal area may be noticed.

When to Seek Medical Care

In the final month of pregnancy or within five months after delivery, seek medical evaluation without delay if any of the following are noticed.

• Shortness of breath that does not improve with rest and is worsening over time
• Difficulty breathing when lying flat
• Pronounced or rapidly worsening swelling in the legs or ankles
• Palpitations or a sensation of irregular heartbeat
• A level of fatigue that seems far beyond what is expected after childbirth

Call emergency services immediately if any of the following occur.

• Sudden and severe shortness of breath
• Sudden, severe chest pain
• Fainting or nearly fainting
• A very rapid or markedly irregular heartbeat

Causes

The precise cause of peripartum cardiomyopathy has not yet been fully established. It is likely that multiple factors work together in women who develop the condition.

• Hormonal changes. Elevated prolactin levels during late pregnancy and breastfeeding are thought to play an important role. Certain breakdown products of prolactin may be toxic to the heart muscle. This mechanism is one of the most studied in peripartum cardiomyopathy and forms the basis for one specific treatment approach.
• Immune system changes. The immune system undergoes significant adjustments during pregnancy to accommodate the developing baby. In some women, these changes may trigger an abnormal immune response directed against the heart muscle.
• Genetic predisposition. Some women may carry genetic characteristics that make their heart muscle more vulnerable to the demands of pregnancy. A family history of peripartum cardiomyopathy may increase the risk.
• Nutritional deficiencies. Deficiencies in certain micronutrients, including selenium, are thought to contribute in some cases.
• Vascular changes. The significant increase in blood volume during pregnancy and the shifts in vascular regulation that accompany it place increased demands on the heart. In susceptible women, these changes may adversely affect the heart muscle.

Risk Factors

Peripartum cardiomyopathy can affect any pregnant woman, but certain factors may increase the likelihood.

• Advanced maternal age. Women over 30 years of age may face a somewhat higher risk.
• Multiple pregnancy. Carrying twins or more places a greater demand on the heart and may raise the risk.
• High blood pressure and preeclampsia. Pregnancy-related hypertension and preeclampsia have been associated with an increased risk of peripartum cardiomyopathy.
• Family history of peripartum cardiomyopathy. Having a first-degree relative with the condition may increase the risk.
• A prior episode of peripartum cardiomyopathy. Women who have had peripartum cardiomyopathy in a previous pregnancy face a meaningful risk of recurrence in future pregnancies.
• African ancestry. Some studies have found that women of African descent may be affected more frequently and may experience a more severe course.
• Nutritional deficiencies. Particularly in regions with limited access to varied nutrition, micronutrient deficiencies may contribute to risk.

Diagnosis

A diagnosis of peripartum cardiomyopathy requires that the condition develops in the final month of pregnancy or within five months of delivery, that heart pumping function is reduced, and that no other cause can be identified. Because symptoms can resemble the normal experiences of late pregnancy and new motherhood, cardiac symptoms arising during this window should always be investigated rather than dismissed.

• Medical history and physical examination. The doctor asks in detail about when symptoms began, how quickly they have progressed, and what stage of pregnancy or the postpartum period the woman is in. Any prior history of peripartum cardiomyopathy and family history are specifically noted. On examination, the doctor listens to the heart and lungs, assesses neck vein distension, and checks for leg swelling.
• Echocardiogram (heart ultrasound). This is the most important diagnostic test. It shows whether the left ventricle has enlarged, how the walls are moving, and what the ejection fraction is — that is, the percentage of blood pumped out with each beat. In peripartum cardiomyopathy, the left ventricle may be enlarged and the ejection fraction may have fallen below 40 percent. Valve function and the space around the heart are also assessed. Echocardiography is repeated regularly to monitor the response to treatment and track recovery.
• Electrocardiogram (ECG). Records the heart's electrical activity. Various changes may be seen in peripartum cardiomyopathy, including sinus tachycardia, voltage changes associated with left ventricular stress, and rhythm disturbances. The findings are not specific to the condition but support the overall clinical picture.
• Blood tests. BNP and NT-proBNP reflect the degree of pressure on the heart and are used to assess the presence and severity of heart failure. Troponin elevation may indicate active heart muscle injury. A full blood count, kidney and liver function, and thyroid hormones are also checked.
• Cardiac MRI. Provides a detailed assessment of heart muscle structure and function. Late gadolinium enhancement can identify areas of fibrosis within the heart muscle. This information helps assess the extent of damage and can guide long-term prognosis. In breastfeeding mothers, the use of gadolinium contrast should be discussed with the doctor.
• Chest X-ray. Can show cardiac enlargement and fluid accumulation in the lungs, providing additional supportive information.

Treatment

Treatment of peripartum cardiomyopathy aims to support heart function, promote recovery, and prevent serious complications. Both the mother's safety and the safety of the baby are considered when selecting treatments. Whether the mother is breastfeeding directly influences which medications can be used.

Medications

• Beta-blockers. These reduce the heart's oxygen demand by slowing the heart rate and moderating its force of contraction. Beta-blockers considered safe during pregnancy and breastfeeding are preferred. Metoprolol is one of the options frequently used during this period.
• ACE inhibitors and ARBs. These widen blood vessels, reduce the workload on the heart, and slow adverse remodeling of the heart muscle. However, because they can harm the developing baby, they are not used during pregnancy. Their use after delivery, including during breastfeeding, should be discussed with the doctor regarding safety.
• ARNI. This newer class of medication provides stronger heart protection than ACE inhibitors or ARBs alone and may be considered in appropriate patients after breastfeeding has ended.
• Diuretics. These remove excess fluid from the body and relieve breathlessness and leg swelling. They can generally be used safely after delivery. During breastfeeding, careful dose adjustment is needed.
• Aldosterone antagonists and SGLT2 inhibitors. These may be added to the treatment plan in appropriate patients after breastfeeding has ended.
• Blood thinners. When the heart is significantly enlarged and pumping poorly, the risk of clot formation inside the heart chambers increases. Blood-thinning medication may be recommended, particularly when the ejection fraction is very low. Heparin or warfarin may be used after delivery depending on the clinical situation.
• Bromocriptine. This medication suppresses the production of prolactin and represents a treatment approach specific to peripartum cardiomyopathy. It is based on the hypothesis that prolactin and its breakdown products can be toxic to the heart muscle. Some clinical studies suggest that bromocriptine may support recovery of heart function. An important consideration, however, is that bromocriptine stops breastfeeding. This must be discussed carefully with the patient, weighing the potential cardiac benefit against the impact on infant feeding. The decision should be individualized.

Managing Rhythm Disturbances

• Antiarrhythmic medications. If atrial fibrillation or ventricular rhythm disturbances develop, medication may be initiated. Drugs considered safe during the breastfeeding period are preferred.
• Implantable cardioverter-defibrillator (ICD). In patients with a significantly reduced ejection fraction and a high risk of life-threatening arrhythmias, ICD implantation may be considered. However, because heart function frequently recovers in peripartum cardiomyopathy, this decision is typically deferred until a sufficient period of treatment has passed and the degree of recovery can be assessed.

Advanced Treatments

• Mechanical circulatory support and heart transplantation. In the rare cases where very severe heart failure develops despite all medical treatment, temporary mechanical circulatory support devices may be used. If heart function does not recover, heart transplantation may ultimately be considered.

Complications

When peripartum cardiomyopathy is identified early and treated appropriately, most women follow a favorable course. In some cases, however, serious complications can develop.

• Persistent heart failure. While a significant proportion of women experience meaningful recovery of heart function within six to twelve months, some do not recover fully and may develop chronic heart failure requiring long-term management.
• Blood clots and stroke. An enlarged and poorly pumping heart carries an increased risk of clot formation. Clots that travel to the brain can cause a stroke.
• Rhythm disturbances. Atrial fibrillation and ventricular arrhythmias can develop, worsening symptoms and adding to cardiovascular risk.
• Sudden cardiac arrest. In severe untreated cases, life-threatening rhythm disturbances can lead to sudden cardiac arrest.
• Recurrence in future pregnancies. Women who have had peripartum cardiomyopathy face a meaningful risk of recurrence with subsequent pregnancies. This risk varies depending on whether heart function has fully recovered. Even women whose heart function has normalized should be counseled carefully before planning a future pregnancy.

Lifestyle

A diagnosis of peripartum cardiomyopathy arrives at one of the most demanding times in a woman's life. Managing a serious heart condition while caring for a newborn places an enormous physical and emotional burden on the mother and her family. The right information and support make a genuine difference.

Breastfeeding

The decision about breastfeeding in peripartum cardiomyopathy requires an individualized discussion. Bromocriptine treatment stops breastfeeding. Some cardiac medications require careful consideration during the breastfeeding period. Your doctor can advise you about which medications are compatible with breastfeeding and which are not. The decision about whether to breastfeed should be made together with your care team, taking both your health and your wishes into account.

Rest and Daily Activity

Adequate rest is important during recovery. Avoiding excessive physical demands and gradually increasing daily activities as heart function improves is the recommended approach. The type and intensity of physical activity that is appropriate should be guided by your doctor. Strenuous exercise may need to be avoided while the heart is still recovering.

Salt and Fluid Intake

Reducing daily salt intake can help relieve breathlessness and swelling by reducing fluid retention. Ask your doctor for a specific daily salt target. In some patients, total fluid intake may also need to be monitored.

Daily Weight Monitoring

Weighing yourself at the same time each morning and recording the result is a practical way to detect fluid accumulation early. A notable weight gain over a short period may signal that fluid is building up. Contact your doctor if this happens and ask at what point a weight change should prompt you to seek care.

Medications

Even when heart function begins to improve, medications are typically continued for a period of time. Do not stop any medication without medical guidance. Discuss with your doctor which medications are safe to continue while breastfeeding. Report any side effects promptly.

Planning a Future Pregnancy

For women who have had peripartum cardiomyopathy, the decision to become pregnant again carries important considerations. The risk of recurrence is real, even when heart function appears to have fully recovered. If heart function remains impaired, a future pregnancy can pose serious risks to both mother and baby. Before planning another pregnancy, a thorough discussion with your cardiologist is essential. Close cardiac monitoring throughout any subsequent pregnancy and in the postpartum period should be planned in advance.

Emotional Support

Receiving a serious cardiac diagnosis during the postpartum period, when so much attention and energy is directed toward a new baby, can be an overwhelming experience for the mother and her family. Anxiety, fear, and low mood are common during this time. Sharing these feelings with your doctor and with people you trust is important. Do not hesitate to seek professional psychological support. The involvement and understanding of a partner and family members can make an enormous difference during recovery.

Regular Follow-up

Peripartum cardiomyopathy requires ongoing monitoring even after heart function appears to have recovered. Echocardiography and blood tests are used to track the course of recovery and to guide any changes in treatment. Do not miss follow-up appointments. Contact your doctor or seek emergency care if any of the following develop.

• Shortness of breath that returns or worsens
• Difficulty breathing when lying flat
• Swelling in the legs or ankles that is new or increasing
• Palpitations or a sensation of irregular heartbeat
• Dizziness or fainting
• A notable weight gain over a short period

Preparing for Your Appointment

Coming prepared to an appointment for peripartum cardiomyopathy helps your doctor make a more accurate assessment and choose the most appropriate treatment for you.

What You Can Do

• Write down when symptoms began and how they have progressed.
• Describe your pregnancy, including the delivery and any complications such as high blood pressure or preeclampsia.
• Mention if you have had peripartum cardiomyopathy before or if there is a family history of the condition.
• Specify whether you are breastfeeding.
• List all medications, supplements, and herbal products you are currently taking.
• Bring any home weight readings you have recorded.
• Write your questions down before the appointment.

Questions You May Wish to Ask Your Doctor

• What is my heart function now and is recovery expected?
• Which medications will I need and are they safe while breastfeeding?
• Is bromocriptine an appropriate treatment for me?
• Can I continue breastfeeding?
• When can I return to daily activities and work?
• I want to become pregnant again — when and how should I plan this?
• Which symptoms should prompt me to seek emergency care?
• How often do I need follow-up appointments?

Questions Your Doctor May Ask You

• When did symptoms begin?
• Does breathlessness worsen when you lie flat?
• Did you have any heart problems before this pregnancy?
• Have you had peripartum cardiomyopathy before?
• Is there a family history of similar heart problems?
• What medications are you currently taking?
• Are you breastfeeding?
• Did you experience high blood pressure or preeclampsia during pregnancy?