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  • Cardiac output units that determine the blood flow from the heart, measuring the changes in the frequency of sound waves reflected by red blood cells (Doppler effect) moving in the ascending aorta. These units consist of a probe that includes piezoelectric crystals that transmit the ultrasonic wave and receive the reflected wave (echo) and an electronic unit that processes the data and displays the values of cardiac output and other hemodynamic parameters such as stroke volume.
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