Cardiomyopathy

Dilated cardiomyopathy is the most common form of cardiomyopathy. The heart muscle is enlarged and stretched (dilated), causing the heart to become weak and pump inefficiently. Other problems that may occur with dilated cardiomyopathy include the following:

• Irregular heart rhythms. 
• Risk of blood clots. 
• Congestive heart failure.

Various infections (including viral) which lead to an inflammation of the heart muscle (myocarditis) can cause this type of cardiomyopathy.

Contact with toxins or very powerful therapeutic drugs, such as certain types of chemotherapy given to fight cancer, have been known to cause dilated cardiomyopathy. Heredity can also be a factor. Twenty percent of people with dilated cardiomyopathy have a parent or sibling with the disease. In many cases, a specific cause for this type of the disease is never identified.

Because the heart muscle is weak and unable to pump enough blood to meet the body's demands, the body tries to preserve blood flow to essential organs such as the brain and kidneys by reducing blood flow to other areas of the body, such as the skin and muscles.

The following are the most common symptoms of dilated cardiomyopathy. However, each child may experience symptoms differently. Symptoms may include: 

• Pale or ashen skin color. 
• Cool, sweaty skin. 
• Rapid heart rate. 
• Rapid breathing rate. 
• Shortness of breath. 
• Fatigue. 
• Irritability. 
• Chest pain. 
• Poor appetite. 
• Slow growth.

Specific treatment for dilated cardiomyopathy will be determined by your child's physician based on: 

• Your child's age, overall health, and medical history. 
• Extent of the disease. 
• Your child's tolerance for specific medications, procedures, or therapies. 
• Expectations for the course of the disease. 
• Your opinion or preference.

Your child's physician may recommend medications to accomplish the following: 

• Help the heart beat more effectively.
• Decrease the workload of the heart. 
• Decrease the oxygen requirements of the heart. 
• Prevent clots from forming.
• Decrease inflammation of the heart.
• Regulate irregular heartbeats.

In some cases, dilated cardiomyopathy due to viral causes improves. In other cases, the condition worsens and transplantation of the heart may be considered. Consult your child's physician for more information regarding the specific outlook for your child.

Hypertrophic cardiomyopathy is also known as hypertrophic obstructive cardiomyopathy, HOCM; asymmetric septal hypertrophy, ASH; or idiopathic hypertrophic subaortic stenosis, IHSS. In this type of cardiomyopathy, the muscle mass of the left ventricle of the heart is larger than normal, or the wall between the two ventricles (septum) becomes enlarged. These abnormalities obstruct the blood flow from the left ventricle.

The thickened muscle or septal wall can also affect one of the leaflets of the mitral valve, which separates the left atrium and the left ventricle. The valve leaflet becomes leaky, allowing blood to move backwards from the left ventricle into the left atrium, instead of forward to the body.

Hypertrophic cardiomyopathy is often hereditary. One-half of children with the disease have a parent or sibling with varying degrees of left ventricular muscle or ventricular wall enlargement, although relatives may or may not have symptoms.

Children with hypertrophic cardiomyopathy may have symptoms that increase with exertion or symptoms may be unpredictable.

The following are the most common symptoms of hypertrophic cardiomyopathy. However, each child may experience symptoms differently. Symptoms may include:

• Shortness of breath on exertion.
• Dizziness.
• Fainting.
• Chest pain.
• Abnormal heart rhythms.

Specific treatment for hypertrophic cardiomyopathy will be determined by your child's physician based on:

• Your child's age, overall health, and medical history.
• Extent of the disease.
• Your child's tolerance for specific medications, procedures, or therapies.
• Expectations for the course of the disease.
• Your opinion or preference.

Your child's physician may recommend medications to accomplish the following:

• Decrease the workload of the heart.
• Decrease the oxygen requirements of the heart.
• Regulate irregular heartbeats.

Surgical treatment may include:

• Removal of part of the enlarged muscle.
• Artificial pacemaker.
• Heart transplantation.