Abstract: The cardiac output(CO)is one of the most direct indicators to reflect cardiac function, and it is great significance to monitor accurately CO and related homodynamic parameters for guiding clinical treatment. Ultrasonic cardiac output monitors(USCOM)with non-invasive, rapid and accurate, is relatively a new technology monitoring CO and has just been put into clinical trial recently. The superiority of this technology has yet to be further tested and improved in clinical scenarios.
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