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Left ventricular systolic time intervals. A comparison between the conventional carotid pulse curve method and the doppler ultrasound method.

From amplitude registration of the doppler ultrasound signal, timing of cardiac valve opening and closure may be achieved and used for the registration of the time intervals of the cardiac cycle. In 42 normal subjects and unselected patients with heart disease a comparison was made of the simultaneously derived left ventricular systolic time intervals (LVSTI) from the conventional noninvasive method of electrocardiogram, phonocardiogram and carotid pulse curve tracing and from an alternative more direct noninvasive method by use of the amplitude tracing of the doppler ultrasound signal. There was a strong correlation between the two methods for each of the different periods of the LVSTI. Differences between the pulse transmission times of curve upstroke and incisura, and possible limitations of both methods are discussed.