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Related Experiment Videos

Applied recording force and noninvasive arterial pulses

M D Driscoll1, J M Arnold, M H Sherebrin

  • 1Department of Medicine, University of Western Ontario, London.

Clinical and Investigative Medicine. Medecine Clinique Et Experimentale
|October 1, 1995
PubMed
Summary

External transducer forces affect arterial pulse measurements. Lower forces minimally alter pulse shape, but higher forces can distort radial artery pulse contours, impacting noninvasive cardiovascular assessments.

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Noninvasive Measurement Techniques

Background:

  • Arterial pressure pulse analysis is crucial for noninvasive cardiovascular assessment.
  • The impact of external transducer forces on pulse waveform accuracy is not well-established.
  • Understanding these forces is vital for reliable pulse measurements.

Purpose of the Study:

  • To investigate how varying compressive forces on an external transducer affect arterial pulse contour and amplitude.
  • To determine the threshold of applied force that causes significant pulse distortion.
  • To differentiate the effects of force on brachial versus radial artery pulse recordings.

Main Methods:

  • Ten healthy young males were studied in a supine position.

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  • Arterial pulses were recorded from the brachial and radial arteries under increasing transducer forces (0.45-4.29 N).
  • Pulse contours were analyzed using Fourier analysis, with harmonic powers normalized to the fundamental frequency.

    • Main Results:

    • Brachial artery pulse amplitude decreased with increasing force (p=0.013).
    • Radial artery pulse amplitude peaked at approximately 1.79 N before decreasing.
    • No significant contour distortion was observed up to 2.18 N (brachial) and 2.59 N (radial); distortion began beyond 2.99 N in the radial artery.

    Conclusions:

    • Applied transducer force significantly alters arterial pulse amplitude, particularly in the radial artery.
    • Pulse contour integrity is maintained within a lower range of applied forces.
    • Careful consideration of transducer force is necessary for accurate noninvasive arterial pulse waveform analysis.