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Related Experiment Videos

Transcutaneous aortovelography. A quantitative evaluation.

R F Sequeira, L H Light, G Cross

    British Heart Journal
    |May 1, 1976
    PubMed
    Summary
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    The haemotachograph, a non-invasive tool for transcutaneous aortovelography, accurately measures aortic arch blood velocity. While absolute flow values were imprecise, it shows promise for monitoring cardiac output changes.

    Area of Science:

    • Cardiovascular Physiology
    • Medical Instrumentation
    • Diagnostic Ultrasound

    Background:

    • Accurate measurement of blood flow in the aortic arch is crucial for assessing cardiac function.
    • Non-invasive methods are desirable to reduce risks associated with traditional invasive techniques.
    • The haemotachograph utilizes ultrasonic Doppler-shift principles for blood velocity assessment.

    Purpose of the Study:

    • To evaluate the accuracy of the haemotachograph, using transcutaneous aortovelography, in measuring blood velocity in the aortic arch.
    • To compare the haemotachograph's measurements with standard invasive cardiac catheterization techniques.
    • To assess the utility of transcutaneous aortovelography for monitoring changes in cardiac output over time.

    Main Methods:

    • The haemotachograph was used to measure blood velocity in the aortic arch in 20 patients.

    Related Experiment Videos

  • Transcutaneous aortovelography measurements were compared against stroke volume determined by invasive methods.
  • Peak velocity measurements were also compared with data from a catheter tip electromagnetic velocity probe.

    • Main Results:

    • A good proportional agreement was found between transcutaneous aortovelography and invasive stroke volume measurements.
    • The accuracy of absolute flow values calculated using transcutaneous aortovelography and dimensional data was poor.
    • Peak velocity measurements from transcutaneous aortovelography showed good agreement with invasive electromagnetic probe data.

    Conclusions:

    • Transcutaneous aortovelography is a valuable non-invasive technique for determining phasic blood flow velocity in the aortic arch.
    • This method can be effectively used to track changes in cardiac output over time.
    • While precise absolute flow quantification remains a challenge, the haemotachograph offers a promising non-invasive approach for hemodynamic monitoring.