Dilated cardiomyopathy is a condition in which the heart becomes weakened and enlarged. As a result, the heart cannot pump enough blood to the rest of the body.
There are many types of cardiomyopathy. Dilated cardiomyopathy is the most common form.
Some experts use the term "dilated cardiomyopathy" for cases where the primary problem is with the muscle itself. This definition does not include weakness or enlargement that was caused by a heart attack or a heart valve problem.
The most common causes of dilated cardiomyopathy are:
- Heart disease caused by a narrowing of the arteries
- Poorly controlled high blood pressure
There are many other causes of dilated cardiomyopathy, including:
- Alcohol or cocaine abuse
- Medicines that can be toxic to the heart, such as drugs used to treat cancer
- Abnormal heart rhythms in which the heart beats very fast for a long period of time
- Autoimmune illnesses
- Conditions that run in families
- Infections that involve the heart muscle
- Heart valves that are either too narrow or too leaky
- Exposure to heavy metals such as lead, arsenic, or mercury
This condition can affect anyone at any age. However, it is most common in adult men.
Symptoms of heart failure are most common. They most often develop slowly over time. However, sometimes symptoms start very suddenly and are severe.
Common symptoms are:
Exams and Tests
During the exam, the health care provider may find:
- The heart is enlarged
- Lung crackles (a sign of fluid buildup), heart murmur, or other abnormal sounds
- The liver is possibly enlarged
- Neck veins may be bulging
A number of laboratory tests may be done to determine the cause:
- Antinuclear antibody (ANA), erythrocyte sedimentation rate (ESR), and other tests to diagnose autoimmune illnesses
- Antibody test to identify infections such as Lyme disease and HIV
- Iron tests of the blood
- Serum TSH and T4 test to identify thyroid problems
- Tests for amyloidosis
Heart enlargement or other problems with the structure and function of the heart (such as weak squeezing) may show up on these tests:
- Echocardiogram (ultrasound of the heart)
- Cardiac stress tests
- Chest x-ray
- Coronary angiogram to look at blood flow to the heart
- CT scan of the heart
- MRI of the heart
- Nuclear heart scan (MUGA, RNV)
Heart biopsy, in which a small piece of heart muscle is removed, may be needed depending on the cause. However, this is rarely done.
Things you can do at home to take care of your condition include:
- Know your body, and watch for symptoms that your heart failure is getting worse.
- Watch for changes in your symptoms, heart rate, pulse, blood pressure, and weight.
- Limit how much you drink and how much salt (sodium) you get in your diet.
Most people who have heart failure need to take medicines. Some medicines treat your symptoms. Others may help prevent your heart failure from becoming worse, or may prevent other heart problems.
Procedures and surgeries you may need include:
- A pacemaker to help treat slow heart rates or help your heartbeat stay in sync
- A defibrillator that recognizes life-threatening heart rhythms and sends an electrical pulse to stop them
- Heart bypass (CABG) surgery or angioplasty to improve blood flow to the damaged or weakened heart muscle
- Valve replacement or repair
For advanced cardiomyopathy:
- A heart transplant may be recommended if standard treatments have not worked and heart failure symptoms are very severe.
- Placement of a left ventricular assist device or artificial heart may be considered.
Chronic heart failure becomes worse over time. Many people who have heart failure will die from the condition. Thinking about the type of care you may want at the end of life and discussing these issues with loved ones and your health care provider is important.
Heart failure is most often a chronic illness, which may get worse over time. Some people develop severe heart failure, in which medicines, other treatments, and surgery no longer help. Many people are at risk for deadly heart rhythms, and may need medicines or a defibrillator.
When to Contact a Medical Professional
Call your health care provider if you have symptoms of cardiomyopathy.
Get emergency medical help right away if you have chest pain, palpitations or fainting.
Cardiomyopathy - dilated
Hare JM. The dilated, restrictive, and infiltrative cardiomyopathies. In: Bonow RO, Mann DL, Zipes DP, Libby P, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 9th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 68.
Update Date 5/13/2014
Updated by: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.