Definition
Cardiomyopathy is a weakening of the heart muscle or a change in heart muscle structure. It is often associated with inadequate heart pumping or other heart function problems.
Overview, Causes, & Risk Factors
Common types of cardiomyopathy include:
- Dilated cardiomyopathy is a condition in which the heart becomes weakened and enlarged. It cannot pump blood efficiently. Many different medical problems can cause this type of cardiomyopathy.
- Restrictive cardiomyopathy refers to a group of disorders in which the heart chambers are unable to properly fill with blood because of stiffness in the heart.
- Hypertrophic cardiomyopathy (HCM) is a condition in which the heart muscle becomes thick. This thickening makes it harder for blood to leave the heart, forcing the heart to work harder to pump blood. This type of cardiomyopathy is passed down through families.
Common causes of cardiomyopathy are:
- Alcoholism and cocaine use
- Chemotherapy drugs
- Pregnancy
- Genetic defects
- Amyloidosis
- End-stage kidney disease
- Infections due to viruses, HIV, Lyme disease, Chagas disease
- Long-term, severe high blood pressure
- Nutritional deficiencies (such as selenium, thiamine, calcium)
- Systemic lupus erythematosus
Please see the linked articles for details on a specific type of cardiomyopathy:
- Dilated cardiomyopathy
- Hypertrophic cardiomyopathy
- Restrictive cardiomyopathy
- Ischemic cardiomyopathy
- Peripartum cardiomyopathy (occurs during or in the first 5 months after pregnancy)
Pictures & Images
Heart, section through the middle
The interior of the heart is composed of valves, chambers, and associated vessels.
Heart, front view
The external structures of the heart include the ventricles, atria, arteries and veins. Arteries carry blood away from the heart while veins carry blood into the heart. The vessels colored blue indicate the transport of blood with relatively low content of oxygen and high content of carbon dioxide. The vessels colored red indicate the transport of blood with relatively high content of oxygen and low content of carbon dioxide.
Review Date : 6/7/2008
Reviewed By : David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Linda Vorvick, MD, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
