Glossary of Terms

This glossary of terms has been compiled for your reference. Select the first letter of the word you’re searching for to begin.

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An abnormally fast heartbeat (more than 100 beats per minute).


The breaking up of a blood clot.


The formation or presence of a blood clot (thrombus) inside a blood vessel or chamber of the heart.


A blood clot that forms inside a blood vessel or chamber of the heart.

Total Anomalous Pulmonary Venous (P-V) Connection

A congenital heart defect. The pulmonary veins that bring oxygen-rich (red) blood from the lungs back to the heart aren’t connected to the left atrium. Instead, the pulmonary veins drain through abnormal connections to the right atrium. The blood passing through the aorta to the body doesn’t have enough oxygen, which causes the child to look blue (cyanotic).

Trans Fats

A type of fat that results from adding hydrogen to vegetable oils used in commercial baked goods and for cooking in most restaurants and fast-food chains.

Transient Ischemic Attack (TIA)

A temporary strokelike event that lasts for only a short time and is caused by a temporarily blocked blood vessel leading to or within the brain. Also called a “little stroke” or “mini-stroke,” it’s an extremely important stroke indicator.

Tricuspid Atresia

A congenital heart defect in which there’s no tricuspid valve. That means no blood can flow from the right atrium to the right ventricle. This results in a blue discoloration of the skin (cyanosis).

Tricuspid Valve

The heart valve between the right atrium and the right ventricle. It has three flaps (cusps).


The most common type of fat in the body. The body gets triglyceride directly from some foods (fatty acids) and makes it in the liver from other energy sources (carbohydrates, alcohol and some cholesterol).


Proteins found in heart muscle. Blood tests for troponins can detect heart muscle injury.