An enlarged heart can often be managed, and in some cases partially reversed, with the right combination of medications, lifestyle changes, and medical procedures. The specific approach depends on what’s causing the enlargement and how severely your heart’s pumping ability has been affected. A normal heart pumps out 50% to 70% of its blood with each beat (a measurement called ejection fraction), and treatment aims to protect or improve that number.
Why the Heart Enlarges
An enlarged heart isn’t a disease on its own. It’s the heart’s response to something else putting it under strain. Understanding the underlying cause shapes every treatment decision that follows.
There are two main patterns. In dilated cardiomyopathy, the heart’s walls stretch thin and weak, so the entire heart balloons outward to hold more blood per beat, compensating for its reduced pumping strength. About 1 in 6 people with this form carry a known genetic variant, but it typically takes a trigger to set things off: a viral infection, heavy alcohol use, chemotherapy, unmanaged high blood pressure, pregnancy, or autoimmune conditions.
In hypertrophic cardiomyopathy, the wall of the heart’s main pumping chamber grows abnormally thick. The heart can never fully relax between beats, and segments keep thickening from overuse. This form has a stronger genetic component, with roughly half or more of cases tied to an inherited gene variant. It can sometimes obstruct blood flow leaving the heart, which creates a different set of risks.
Other common causes include long-standing high blood pressure (which forces the heart to work harder year after year), damaged heart valves, and coronary artery disease. Treating the root cause is always the first priority.
Medications That Improve Heart Function
For most people with an enlarged heart, medication is the cornerstone of treatment. Several drug classes work together to reduce the heart’s workload and, over time, allow it to recover some of its size and strength.
Blood pressure medications are central. Beta-blockers slow the heart rate and lower blood pressure, giving the heart more time to fill and pump efficiently. ACE inhibitors and ARBs relax blood vessels so the heart doesn’t have to push as hard. Diuretics (water pills) reduce fluid buildup by helping the body shed excess sodium and water, which lowers blood pressure and eases the strain of fluid overload. Blood thinners may be added to prevent clots, and anti-arrhythmic drugs can help control irregular heart rhythms that often accompany enlargement.
A newer class of medications, SGLT2 inhibitors (originally developed for diabetes), has become an important addition. Two large clinical trials found that these drugs significantly reduced hospitalizations for heart failure and cardiovascular death, even in patients whose ejection fraction was only mildly reduced. They work through several mechanisms at once: a mild diuretic effect, improved metabolism in the heart muscle and blood vessels, and measurable improvements in cardiac structure and function. They currently carry a strong recommendation in treatment guidelines.
Can an Enlarged Heart Shrink Back?
Yes, in many cases. Research published in the American Heart Association’s journal Circulation: Heart Failure found that patients with dilated cardiomyopathy who stayed on guideline-directed medications for at least 12 months showed significant structural improvement. Their heart chambers shrank in volume, ejection fraction increased by more than 10 percentage points, and imaging revealed that the heart muscle tissue itself was recovering, with reductions in both the muscle cells and the surrounding tissue matrix.
This process, called reverse remodeling, doesn’t happen for everyone, and the degree of recovery varies. But the findings reinforce that sticking with prescribed medications matters even after symptoms improve. Stopping treatment can allow the heart to re-enlarge. Patients who experienced reverse remodeling also had lower blood pressure, slower resting heart rates, and improved symptom scores during follow-up.
Devices and Surgical Options
When medications alone aren’t enough, implantable devices can help. A small defibrillator placed under the skin (an ICD) monitors for dangerous heart rhythms and delivers a corrective shock if needed. For hearts that pump out of sync, a specialized pacemaker called a cardiac resynchronization therapy device coordinates the timing of the heart’s contractions so it pumps more effectively.
If the heart weakens severely, a mechanical pump called a left ventricular assist device (LVAD) can be surgically placed inside the chest to help the heart move blood. An LVAD requires open-heart surgery and carries serious risks, but it can be lifesaving for people with severe heart failure. Some patients receive one as a bridge while waiting for a heart transplant. Others live with the device long-term when transplant isn’t an option.
Heart transplant remains the last resort for end-stage cases that don’t respond to other treatments. Valve repair or replacement surgery may also be necessary when a faulty valve is the underlying cause of the enlargement.
Sodium and Fluid Limits
Dietary changes play a bigger role than many people expect. The Heart Failure Society of America recommends limiting sodium to 2,000 to 3,000 milligrams per day for people with heart failure, and below 2,000 milligrams for moderate to severe cases. For context, a single fast-food meal can easily contain 1,500 milligrams or more.
Fluid restriction also helps. Guidelines suggest capping total fluid intake at about 50 ounces per day (roughly six glasses), including water, coffee, soup, and even high-water fruits. Excess fluid increases blood volume, which forces the heart to work harder and can worsen swelling in the legs and lungs. Tracking both sodium and fluid daily, especially during the first few months of treatment, gives medications the best chance to work.
Exercise With an Enlarged Heart
Physical activity is recommended for most people with heart failure, but the approach is deliberately gradual. Walking is the go-to starting point. Begin with five to ten minutes at a moderate pace, meaning your breathing picks up slightly but you can still hold a conversation. Add one or two minutes each day as you tolerate it, working toward a goal of 30 to 45 minutes on most days, with rest breaks as needed.
Warm up for three minutes by walking slowly, and cool down the same way at the end. Try to exercise at the same time each day so variables like meals, medications, and energy levels stay consistent. Shorter bursts of activity spread throughout the day count too, especially early on. Avoid lying down immediately after exercise, as this can reduce your body’s ability to adapt to physical effort over time.
Some shortness of breath and a faster heart rate during exercise are normal. What isn’t normal: excessive breathlessness, a rapid heart rate that doesn’t settle within 15 minutes of rest, dizziness, chest discomfort, or sudden weakness. These are signals to stop, rest, and contact your doctor. Depending on the type and severity of your cardiomyopathy, certain high-intensity activities or competitive sports may need to be avoided entirely.
Monitoring Your Progress
Ejection fraction is the number your care team will track most closely. A mildly abnormal reading falls between 41% and 51% for men (41% to 53% for women). Moderately abnormal is 30% to 40%, and anything below 30% is considered severely reduced. These ranges help guide decisions about whether to adjust medications, add devices, or consider surgical options.
Regular imaging, usually echocardiograms, lets your doctor see whether the heart is shrinking back toward normal size or continuing to enlarge. Blood tests that measure markers of heart strain also help track whether treatment is working. Because reverse remodeling can take 12 months or longer to become apparent on imaging, patience with the process matters. The combination of consistent medication use, sodium and fluid management, and gradual physical activity gives the heart the best environment to recover.