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Related Experiment Videos

Novel method to estimate ventricular contractility using intraventricular pulse wave velocity.

T Shishido1, M Sugimachi, O Kawaguchi

  • 1Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Suita, Osaka 565-8565, Japan.

The American Journal of Physiology
|December 22, 1999
PubMed
Summary

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We developed a novel method to measure ventricular contractility using intraventricular pulse wave velocity (PWV). This technique accurately estimates left ventricular elastance without needing volume or load measurements.

Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Cardiac Mechanics

Background:

  • Assessing ventricular contractility is crucial for diagnosing cardiac conditions.
  • Current methods often require invasive procedures or complex load manipulation.
  • A non-invasive, load-independent method for contractility assessment is highly desirable.

Purpose of the Study:

  • To introduce and validate a novel technique for estimating ventricular contractility.
  • To determine if intraventricular pulse wave velocity (PWV) can serve as a reliable indicator of left ventricular contractility.
  • To assess the sensitivity of this method to preload variations.

Main Methods:

  • Developed a technique measuring intraventricular pulse wave velocity (PWV) in isolated canine hearts.

Related Experiment Videos

  • Injected volume pulses at late diastole and systole, measuring transit time from base to apex.
  • Calculated PWV and correlated it with established measures of ventricular contractility, such as end-systolic elastance.

    • Main Results:

    • Intraventricular PWV significantly increased from diastole (2.3 m/s) to systole (11.7 m/s).
    • The square of systolic PWV showed a strong linear correlation with left ventricular end-systolic elastance (r=0.939) and end-systolic Young's modulus (r=0.901).
    • PWV measurements were found to be insensitive to preload changes.

    Conclusions:

    • Intraventricular PWV at late systole is a reliable indicator of left ventricular end-systolic elastance.
    • This novel PWV-based technique offers a promising, load-independent method for assessing ventricular contractility.
    • The technique's simplicity and lack of need for volume measurement or load manipulation make it an attractive clinical tool.