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TEE (Transesophageal Echocardiography)
A Doppler echocardiographic transducer is inserted in the esophagus to visualize the lungs, heart and great vessels.

Thrombus, pl. (Thrombi)
A clot in the cardiovascular systems formed during life from constituents of blood; it may be occlusive or attached to the vessel or heart wall without obstructing the lumen (mural thrombus).

Trendelenburg Position
Position in which the patient's head is low and the body and legs are on an elevated and inclined plane.

Tricuspid Valve
The valve between the right atrium and the right ventricle.

An instrument for withdrawing fluid from a cavity. It consists of a metal tube (cannula) into which fits an obturator with a sharp three-cornered tip, which is withdrawn after the instrument has been pushed into the cavity. The name trocar is usually applied to the obturator alone, the entire instrument being designated trocar and cannula.

Unstable Angina
Angina or chest pain that occurs at rest, new onset of pain with exertion, or pain that has accelerated (more frequent, longer in duration, or lower in threshold).

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