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Sometimes problems with the heart's electrical signals lead to a fast heart rhythm. Too many signals may make the heart beat very fast (tachycardia). Or signals may be sent so rapidly and irregularly that the heart muscle sometimes quivers and doesn't beat at all (fibrillation).

Angiography is a special type of x-ray that allows your coronary arteries to be viewed and recorded on film. Your doctor can see if the blood vessels to your heart are clogged.

A transthoracic echocardiogram (echo) is an imaging test. It helps your doctor assess your heart. Here's how it works.

If you have cardiomyopathy, you have a problem with the muscle tissue that makes up your heart. Cardiomyopathy means "heart muscle disease." Your heart may not be pumping as well as it should.

If you feel safe and comfortable while exercising, you are more likely to stick with your exercise program.

Your surgeon will use monitored anesthesia care (MAC) during your upcoming surgery. This sheet tells you more about this type of anesthesia.

Dry needling is like acupuncture. A healthcare provider puts needles into painful parts of the body and touches, taps, or pricks tissues to ease pain.

Baby acne (neonatal acne) is a skin condition that affects about 2 out of 10 newborns. It occurs when a baby is about 2 to 6 weeks old.

Polyarthritis is a term for arthritis that affects five or more joints at the same time. Learn about the causes, symptoms, and treatments.