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echocardiography (ek″o-kahr″de-og´rә-fe) recording of the position and motion of the heart walls or internal structures of the heart and neighboring tissue by the echo obtained from beams of ultrasonic waves directed through the chest wall. It uses ultrasound to delineate anatomical structures by recording on a graph the echoes that they make. It is particularly useful in demonstrating, without danger to the patient, valvular and other structural deformities of the heart. Doppler echocardiography
an echocardiographic technique that records the flow of red blood cells through the cardiovascular system by means of Doppler
ultrasonography. M-mode echocardiography
a technique in which a narrow stationary ultrasound beam is aimed through the heart and reflects back from each fluid-filled
interface. The time the echo takes to return indicates the distance of the interface from the transducer. The M-mode scan
thus provides a one-dimensional view that shows the motion of the heart valves and chamber walls over a period of time. transesophageal echocardiography(TEE)
the introduction of a transducer attached to a fiberoptic endoscope into the esophagus to provide two-dimensional cardiographic
images or Doppler information. It is especially helpful in detecting enlargement of the cardiac chambers, septal defects,
and pericardial effusion, and in assessing valvular function.
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