Enlarged Heart: Causes, Symptoms, and Treatment Options

In early stages, an enlarged heart usually doesn’t cause noticeable symptoms. But as the condition progresses and the heart struggles to pump blood effectively, signs of heart failure may appear. These can include chest pain, shortness of breath during activity, rapid or irregular heartbeat, swelling in the legs or abdomen, and general fatigue. Some people may also experience fainting or dizziness, especially if the heart’s rhythm becomes erratic.

Several conditions can lead to cardiomegaly. The most common are high blood pressure, coronary artery disease (CAD), and past heart attacks. Valve problems and inherited heart disorders also contribute. Other causes include heart muscle disease (cardiomyopathy), thyroid imbalances, pulmonary hypertension, and chronic illnesses like kidney disease or diabetes. Lifestyle factors—such as long-term alcohol use or certain infections—can also play a role.

Doctors diagnose patients with either dilated cardiomyopathy or hypertrophic cardiomyopathy. The former is the most common type and involves the thinning or stretching of one or both of the heart's ventricles. Hypertrophic cardiomyopathy, when the left ventricle thickens and enlarges, is often inherited and may be present at birth.

Chest x-rays and electrocardiograms are common in diagnosing an enlarged heart. A chest x-ray allows doctors to evaluate the cardio-thoracic ratio to determine if the heart is too large. Recording the organ's electrical activity via electrocardiogram testing detects problems with rhythm and determines whether damage to heart muscles has occurred from "silent" heart attacks. Echocardiograms monitor sound waves produced by a beating heart and assess the condition of the four chambers. In some cases, doctors may also want to do a cardiac catheterization to obtain a sample of the heart's tissues to look for signs of infection, inflammation, or abnormal cells. This information may help determine the cause of an enlarged heart.

Many medications can treat an enlarged heart, including diuretics to lower water and sodium levels and relieve pressure, anticoagulants to minimize the risk of blood clots, blood pressure medications, and antiarrhythmics to regulate heartbeat. Physicians may prescribe one or more of these, depending on the related complications.

Pacemakers and implantable cardioverter defibrillators (ICDs) coordinate contractions between the right and left ventricles. Patients with serious arrhythmias may need one of these devices to maintain a normal heartbeat. In advanced cases of cardiomegaly, surgical procedures such as heart valve or coronary bypass surgery can prevent heart failure. When an enlarged heart does not respond to less-invasive treatments, a heart transplant is a final option.

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While an enlarged heart is nearly always treatable, complications may arise if the individual does not take medications as prescribed or has not made lifestyle changes essential for supporting heart health. Heart failure is the most serious complication, followed by blood clots and sudden death. Cardiomegaly facilitates the formation of blood clots in the heart's lining. If just one clot becomes dislodged and enters the bloodstream, it could travel to a vital organ and cause a stroke or heart attack. Heart murmurs may occur if the heart's valves do not close properly; the noise is the sound of blood flowing back into the heart.

The following factors can raise one's risk of cardiomegaly: high blood pressure, family history of cardiomyopathy, coronary artery disease, congenital heart disease, heart valve disease, history of heart attack, viral infection of the heart, alcohol abuse, recurring heart infections, and vitamin deficiencies.

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Although infections and heredity are uncontrollable, other factors that raise one's risk of cardiomegaly can be mitigated and the risk reduced. Everyone can benefit from these preventative measures, though they are most important for people already at high risk. Try to limit salt intake, eat healthy foods, and exercise regularly. Get enough sleep every night to minimize stress, and take prescribed medications as instructed. People with hypertension should regularly monitor their blood pressure. Cardiomegaly affects people of all ages,although it's more common in older men and women.

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Most people with an enlarged heart who take their medications and make necessary lifestyle changes lead normal lives. Cardiomegaly typically stabilizes and may even improve following diagnosis and treatment. People with enlarged hearts should report any unusual or worsening symptoms to their doctor as soon as they develop.

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