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Related Experiment Videos

A microcomputer-based, R-wave triggered system for hemodynamic measurements in the forearm.

P C Chang1, R Verlinde, T Bruning

  • 1Department of Nephrology, University Hospital, Leiden, The Netherlands.

Computers in Biology and Medicine
|January 1, 1988
PubMed
Summary

This study introduces a new R-wave triggered microcomputer system for precise limb blood flow measurement. The system offers semi-continuous, on-line data acquisition, improving accuracy over manual methods.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Instrumentation

Background:

  • Accurate measurement of limb blood flow is crucial for diagnosing and monitoring vascular conditions.
  • Traditional methods like hand-operated plethysmography can be imprecise and introduce bias.
  • There is a need for automated, precise systems for real-time circulatory assessments.

Purpose of the Study:

  • To describe a novel R-wave triggered microcomputer-based system for on-line, semi-continuous limb blood flow measurement.
  • To evaluate the system's capability for simultaneous measurement of heart rate and blood pressure.
  • To assess the system's performance in measuring maximal flow after ischemia.

Main Methods:

  • Development of a microcomputer system (8088/80286 processor) utilizing R-wave triggering.

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  • Implementation of on-line, semi-continuous measurement of blood flow in one or two limbs.
  • Integration of simultaneous heart rate and intra-arterial blood pressure monitoring.
  • Validation against hand-operated plethysmography.

    • Main Results:

    • The system enables measurements with a minimal interval of approximately 4 seconds.
    • Accurate measurement of maximal flow post-ischemia is achievable.
    • The automated system demonstrated improved measurement precision compared to manual plethysmography.
    • Minimized perturbations to limb circulation and elimination of manual analysis bias were observed.

    Conclusions:

    • The described R-wave triggered microcomputer system provides a precise and reliable method for limb blood flow assessment.
    • The system facilitates accurate, real-time monitoring of cardiovascular parameters, including post-ischemic flow.
    • This technology offers significant advantages over traditional manual techniques in clinical and research settings.