Transfusion
The transfer of blood or blood products from one person (the donor) into the bloodstream of another person (the recipient). In most situations, transfusion is done as a lifesaving maneuver to replace blood cells or blood products lost through severe bleeding. Transfusion of one’s own blood (autologous transfusion) is the safest method, but it requires advanced planning, and not all patients are eligible. Directed donor blood allows the patient to receive blood from known donors. Volunteer donor blood is usually most readily available and, when properly tested, has a low incidence of adverse events.
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- Transfusion medicine
The practice of blood transfusion and blood conservation, complementary activities that ensure the best balance between safety and convenience during emergency care or surgery.
- Transgenic
Having genetic material (DNA) from another species. This term can be applied to an organism that has genes from another organism. It is understood that the foreign genes are in the transgenic animal’s germ-cell DNA and so can be transmitted from one generation to the next.
- Transient global amnesia
Attacks must be witnessed and information must be available from a capable observer. Clear-cut anterograde amnesia must be present during the attack. Clouding of consciousness and loss of personal identity must be absent and cognitive impairment must be limited to amnesia. There must be no accompanying focal neurological symptoms or signs, and epileptic features must […]
- Transient ischemic attack (TIA, Mini-Stroke)
A neurological event with the signs and symptoms of a stroke, but which go away within a short period of time. Also called a mini-stroke, a TIA is due to a temporary lack of adequate blood and oxygen (ischemia) to the brain. This is often caused by the narrowing (or, less often, ulceration) of the […]
- Transillumination
The passing of a strong beam of light through a part of the body for medical inspection. A method of examination by the passage of light through tissues or a body cavity. A common use of transillumination is in infancy. The infant’s skull should normally not transilluminate (let a beam of light pass through it). […]