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Related Experiment Videos

Systolic time intervals by echocardiography.

M A Stefadouros, A C Witham

    Circulation
    |January 1, 1975
    PubMed
    Summary

    A novel echocardiogram method accurately measures systolic time intervals when traditional phonocardiograms fail. This noninvasive technique offers a reliable alternative for crucial cardiac assessments.

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    Area of Science:

    • Cardiology
    • Medical Imaging
    • Biomedical Engineering

    Background:

    • Phonocardiograms and carotid pulses can present technical recording challenges.
    • Accurate determination of systolic time intervals is clinically significant.
    • Existing methods for measuring systolic time intervals are sometimes unreliable.

    Purpose of the Study:

    • To evaluate the efficacy of aortic valve echocardiography for determining systolic time intervals.
    • To establish an alternative noninvasive method for systolic time interval measurement.
    • To compare echocardiography-derived intervals with conventional methods.

    Main Methods:

    • Utilized high-speed strip chart recording of the aortic valve echocardiogram in 52 patients.
    • Calculated ejection time (aortic valve opening to closing).
    • Determined pre-ejection period (Q wave to aortic valve closing) and pre-ejection period/ejection time ratio.

    Main Results:

    • Satisfactory echocardiogram recordings were obtained in 36 patients.
    • High correlation (r > 0.97) was observed between echocardiography and conventional methods.
    • Differences in measured intervals were statistically insignificant, with ejection time differing by a maximum of 16 msec.

    Conclusions:

    • Aortic valve echocardiography is a viable noninvasive alternative for systolic time interval determination.
    • This method is particularly useful when conventional techniques are hindered by technical difficulties.
    • Echocardiography provides accurate and reliable systolic time interval data.

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