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In page Cardiovascular technologist:

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Technicians who use ultrasound to examine the heart chambers, valves, and vessels are referred to as cardiac sonographers.[1] They use ultrasound instrumentation to create images called echocardiograms. An echocardiogram may be performed while the patient is either resting or physically active. Technicians may administer medication to physically active patients to assess their heart function. Cardiac sonographers also may assist transesophageal echocardiography, which involves placing a tube in the patient's esophagus to obtain ultrasound images.[citation needed]