Derivation of systolic time intervals from doppler measurement of temporal arterial blood flow

The carotid pulse method of recording systolic time intervals is limited by significant motion-induced artifact, making it unsuitable for studying patients during exercise. As an approach to overcoming this limitation, a new method utilizing the blood velocity profile of the superficial temporal artery measured by Doppler ultrasound has been developed. When compared with the values obtained from the conventional carotid pulse method, Doppler-derived left ventricular election time and preejection period showed excellent correlation (r = 0.99 for both) and the Doppler-derived measurements showed little intra- or interobserver variability. Studies performed during treadmill exercise showed that in 8 of 10 subjects, suitable tracings could be recorded through stage 3 of the Bruce protocol, confirming the enhanced stability of the technique compared with the carotid pulse method.