This is an abbreviated version of the complete article.*
||Cardiomyopathy is a term for chronic disorders of the heart that reduce its ability to pump blood.
||The weakened heart compensates for reduced output of blood by dilating, or enlarging, to hold more blood.
||Dilated cardiomyopathy is a common cause of congestive heart failure.
Cardiomyopathy is a chronic disorder that occurs when the heart weakens and can no longer pump sufficient amounts of blood. Although there are several types of cardiomyopathy, the most common form is dilated cardiomyopathy, in which the heart enlarges to compensate for its inability to pump blood effectively.
By dilating, or enlarging, the heart holds and pumps a higher volume of blood. In addition, the enlarged heart might temporarily increase the force of each heartbeat or elevate the heart rate (number of heartbeats per minute) to continue pumping an increased amount of blood.
WHAT ARE THE SYMPTOMS?
Because the body compensates for dilated cardiomyopathy, the disease may have no symptoms initially. As the condition worsens, the heart may perform normally when a person is resting, but may cause symptoms during periods of exercise or psychological stress.
Dilated cardiomyopathy is a common cause of congestive heart failure, the symptoms of which are often the first indication that a person has cardiomyopathy. Symptoms of congestive heart failure include:
CAUSES AND RISK FACTORS
- Dyspnea (shortness of breath);
- Orthopnea (shortness of breath while lying down);
- Edema (swelling of feet, ankles, legs, or abdomen);
- Palpitations (awareness of one's own heartbeat);
- Lung congestion; and
Although most cases of dilated cardiomyopathy result from unknown causes, known causes include:
- Myocarditis (inflammation of the heart's walls);
- Ischemia (lack of oxygen in the heart);
- A previous heart attack;
- Severe coronary artery disease;
- Heart valve disease;
- Chronic alcohol abuse;
- Chemotherapy drugs;
- High blood pressure;
- Arrhythmias (disturbances of the heart's rhythm or rate); and
- Autoimmune illnesses (such as lupus or rheumatoid arthritis).
A physician diagnoses dilated cardiomyopathy after a physical examination. He or she may check for shortness of breath during exercise and weakness. The physician may also hear rales, or wet crackles, through a stethoscope, indicating fluid in the lungs.
To confirm the diagnosis, the physician may order tests, including:
- Blood tests;
- Chest x ray;
- Electrocardiography (ECG); and
- Cardiac catheterization and angiography.
A physician may recommend that the patient first make lifestyle changes, including:
The physician may also prescribe medications to control the symptoms of heart failure that can accompany dilated cardiomyopathy, including:
- Rest adequately;
- Control weight;
- Stop smoking;
- Consume alcohol moderately;
- Exercise moderately; and
- Limit sodium in the diet.
Patients with persistent, severe dilated cardiomyopathy despite medical therapy are candidates for placement of an implantable cardiac defibrillator (ICD) to prevent sudden cardiac death.
- Angiotensin converting enzyme (ACE) inhibitors;
- Calcium channel blockers;
- Nitrates; and
Patients with severe congestive heart failure that is associated with dilated cardiomyopathy may require a heart transplant.
Medical Review Date: November 5, 2007
*If you would like to read this article in its entirety, please call our office and ask to meet with one of our specialists to receive a Prescription Pad form.
*If you already have a Prescription Pad form, please login and follow the instructions listed on the form. If you experience any issues during the registration process, please call member services at 1-800-603-1420 for assistance.
Copyright © 2013 NorthPoint Domain, Inc. All rights reserved.
This material cannot be reproduced in digital or printed form without the express consent of NorthPoint Domain, Inc. Unauthorized copying or distribution of NorthPoint Domain's Content is an infringement of the copyright holder's rights.