An abnormally rapid heart rhythm that originates from a ventricle, one of the lower chambers of the heart. Although the beat is regular, ventricular tachycardia is life-threatening because it can lead to a dreaded condition, ventricular fibrillation.
In ventricular fibrillation, the ventricles beat rapidly in a chaotic, purposeless fashion. The heart cannot pump blood effectively to the body. If untreated, ventricular fibrillation can be fatal within minutes, or even seconds. An estimated 250,000 Americans die in this way each year.
Ventricular tachycardia is most commonly associated with heart attacks or scarring of the heart muscle from a previous heart attack.
Having to do with touch. For example, tactile signs of disease are signs that are perceptible by touch, such as roughness of the skin.
- Tactile device
A mechanical instrument that makes use of touch to help individuals who have certain disabilities, such as deaf-blindness, to communicate.
In medicine, taenia is a genus (group) of large tapeworms some of which are parasitic in humans. In anatomy, taenia refers to a band or a structural line and applies to several bands and lines of nervous matter in the brain. In Latin, taenia means a ribbon or tape. Taenia is also spelled tenia.
- Taenia asiatica
A species of tapeworm found in Taiwan, Korea, Indonesia, Vietnam, and China, where rural people eat uncooked home-produced pork-containing organs.
- Taenia saginata
The beef tapeworm. The most common of the big tapeworms that parasitizes people, contracted from infected raw or rare beef. Can grow to be 12-25 feet (3.6-7.5 m) long in the human intestine. Also known as the African tapeworm.