Abstract
An ultrasonic Doppler transducer suitable for intra-esophageal use in humans has been constructed, tested, and its function as a flow monitoring device assessed on a series of 15 unselected anaesthetized human subjects undergoing surgery. Doppler flow signals from the descending thoracic aorta have been obtained in all cases. Once correctly positioned, the probe can give continuous qualitative monitoring of pulsatile aortic blood flow velocity for extended periods. It is possible to observe flow waves in the descending thoracic aorta from the aortic arch distally for about 20 cm and observe the change from disturbed to laminar flow patterns over this length.
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