Restrictive cardiomyopathy is the least common form and occurs when the heart muscle of the ventricles, or myocardium, is excessively rigid, impairing the filling of the ventricles with blood between heartbeats. Tiredness, shortness of breath and swollen feet and hands typically occur.
Arrhythmogenic right ventricular cardiomyopathy
In another form of cardiomyopathy, the heart muscle is replaced by fibrous scar and fatty tissue. This may occur after a heart attack, where muscle is damaged – the right ventricle tends to be most affected. The right side of the heart may first thicken and later dilate – become thinner. It may lead to disordered electrical activity, and in some cases problems with the heart’s pumping action.
What is cardiomyopathy?
Cardiomyopathy is a disease that changes the structure of the muscle tissue in the heart, or makes it weaker, so it’s less able to pump blood efficiently.
Symptoms may appear suddenly with loss of consciousness, or there may be warning signs such as pain in the chest (angina), unexplained breathlessness or a rapid heartbeat (palpitations or arrhythmia).
Cardiomyopathy may be either:
- Primary – no specific cause can be identified
- Secondary – causes can be identified, such as hypertension (high blood pressure), heart valve disease, artery diseases or congenital heart defects, as well as disease affecting organs other than the heart. Alcohol and drug use (both street drugs and medical drugs) can also cause cardiomyopathies
There are three main types of cardiomyopathy or disease of the heart muscle: