Echocardiography During Pregnancy: When and Why Your Doctor Orders an Echo Test

Pregnancy is one of the most beautiful — and physically demanding — journeys a woman's body goes through. While most conversations around prenatal care focus on blood tests, ultrasounds, and nutrition, heart health deserves equal attention. For some expectant mothers, the doctor may recommend an echo test during pregnancy to get a closer look at how the heart is coping with the changes pregnancy brings.

If you've been asked to get an echocardiogram and aren't sure why, this article is for you. We'll walk you through what an echo is, how pregnancy affects the heart, who needs this test, and what to expect — in simple, straightforward language.

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How Pregnancy Changes Your Heart

From the very first trimester, your heart starts working harder. This is not a warning sign — it is normal physiology. Here is what happens:

• Blood volume increases by about 40–50% during pregnancy to supply the placenta and growing baby.
• Heart rate rises by 10–20 beats per minute compared to pre-pregnancy.
• Cardiac output (the amount of blood the heart pumps per minute) goes up significantly.
• Blood pressure may dip in the second trimester and then gradually rise again.

For a healthy heart, these changes are well-tolerated. But for a woman with an existing or undetected heart condition, this extra load can cause symptoms — or sometimes, reveal a problem that was quietly present all along.

This is precisely why cardiologists sometimes order an echo test during pregnancy: not to frighten, but to understand and protect.

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What Is an Echocardiogram?

An echocardiogram (often called an "echo") is a non-invasive imaging test that uses sound waves (ultrasound) to create moving pictures of your heart. It shows:

• The size and shape of the heart chambers
• How well the heart muscle is pumping (ejection fraction)
• The valves — whether they are opening and closing properly
• Blood flow patterns inside the heart
• Any fluid around the heart (pericardial effusion)

The test is comfortable, does not involve radiation, and is completely safe for both mother and baby. A small probe called a transducer is placed on the chest with a little gel, and images appear on a screen in real time. Most echoes take about 30–45 minutes.

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When Is an Echo Test Ordered During Pregnancy?

Not every pregnant woman needs an echocardiogram. Your obstetrician or cardiologist will recommend one based on specific signs, symptoms, or history. Common reasons include:

1. Known Heart Disease Before Pregnancy

Women who have a history of congenital heart disease (heart defects present from birth), rheumatic heart disease (a common concern in India, including in Gujarat), or previous heart surgery need close monitoring throughout pregnancy. An echo helps track how the heart is handling the added workload.

2. Heart Murmur Detected During Antenatal Check-Up

A doctor may hear an unusual sound (murmur) through a stethoscope. While many murmurs in pregnancy are "innocent" and related to increased blood flow, some can point to valve problems. An echo quickly clarifies this.

3. Symptoms That Need Investigation

Symptoms such as shortness of breath, palpitations, chest discomfort, persistent fatigue, or swelling of the legs can sometimes be pregnancy-related — but they can also signal a cardiac issue. An echo helps rule in or rule out a heart cause.

4. High-Risk Pregnancy Conditions

Conditions like preeclampsia (high blood pressure in pregnancy) and gestational hypertension can strain the heart. An echo helps the cardiology team understand the extent of any cardiac involvement and guide management.

5. Peripartum Cardiomyopathy (PPCM)

This is a specific type of heart failure that can develop in the last month of pregnancy or within five months after delivery. It is uncommon but important to diagnose early. An echo is the key diagnostic tool. A woman experiencing new breathlessness and leg swelling near her due date, for example, would typically be evaluated with an echo.

6. Arrhythmias (Irregular Heartbeat)

Some women experience new or worsening arrhythmias during pregnancy. An echo helps check if there is any structural reason behind the irregular rhythm.

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Fetal Echocardiography: A Different but Related Test

You may also hear the term fetal echocardiography. This is a separate test — different from the mother's echo — that examines the baby's heart while still in the womb. It is typically done between 18 and 24 weeks of pregnancy.

A fetal echo may be recommended when:

• A parent has a congenital heart defect
• A routine pregnancy ultrasound shows a potential abnormality in the baby's heart
• The mother has diabetes, lupus, or certain infections during pregnancy
• The mother has taken certain medications that may affect fetal heart development

This test is equally safe and non-invasive, performed through the mother's abdomen using standard ultrasound technology.

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What Happens During the Echo Test?

Knowing what to expect can ease any anxiety. Here is a simple step-by-step overview:

1. You lie down on a comfortable examination table, usually on your left side (a position that is also easier on the heart during pregnancy).
2. Gel is applied to your chest — it may feel slightly cool.
3. The transducer probe is gently moved across your chest in different positions.
4. You may be asked to breathe in, breathe out, or hold your breath briefly for better image capture.
5. The cardiologist or technician reviews the images — sometimes in real time.
6. The entire process is radiation-free and carries no known risk to the pregnancy.

After the test, a report is generated and shared with your treating doctor, who will explain the findings and next steps if needed.

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Managing Heart Conditions During Pregnancy

If the echo does reveal a concern, it is important to remember: a cardiac condition during pregnancy is manageable with the right care team. Modern cardiology and obstetrics work closely together — a field called cardio-obstetrics — to ensure both mother and baby remain safe.

Management may include:

• Regular monitoring with repeat echoes at intervals
• Medication adjustments (some heart medications are safe in pregnancy; others need to be switched)
• Lifestyle guidance — rest, salt moderation, staying hydrated, gentle activity
• Planned delivery settings at a centre equipped for cardiac monitoring during labour

In Rajkot and across Gujarat, more women are now aware of the importance of cardiac screening in pregnancy — a positive trend that leads to earlier intervention and better outcomes for families.

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Key Takeaways

• Pregnancy significantly increases the workload on the heart — making cardiac evaluation important for women with any existing or suspected heart condition.
• An echocardiogram (echo) is safe, non-invasive, and radiation-free — no risk to mother or baby.
• Common reasons for an echo during pregnancy include heart murmur, known heart disease, preeclampsia, palpitations, breathlessness, and peripartum cardiomyopathy.
• Fetal echocardiography is a separate test that looks at the baby's heart, usually between 18–24 weeks.
• Early diagnosis through an echo allows for timely, effective management — protecting both mother and child.
• If your doctor recommends an echo, treat it as a step toward confidence and care, not cause for worry.

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Frequently Asked Questions

Is an echo test safe during pregnancy?

Yes. Echocardiography uses sound waves, not radiation. It has been used safely in pregnant women for decades and poses no known risk to the mother or the developing baby.

Will every pregnant woman need an echocardiogram?

No. An echo is recommended only when there is a specific clinical reason — such as symptoms, a murmur, a known heart condition, or a high-risk pregnancy. Your doctor will guide you based on your individual health profile.

How is a fetal echo different from a regular pregnancy ultrasound?

A standard pregnancy ultrasound gives an overview of the baby's development. A fetal echocardiogram is a detailed, focused examination of the baby's heart structure and function, performed by a specialist and taking more time than a routine scan.

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If you have any concerns about your heart health during pregnancy, consider speaking with a qualified cardiologist who can evaluate your individual situation. For personalised cardiac care in Rajkot, you are welcome to book a consultation with Dr. Nikhila Pachani, Consultant Interventional Cardiologist.