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Related Experiment Video

Updated: Jun 20, 2026

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
11:50

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

Published on: July 9, 2010

Augmentation index, left ventricular contractility, and wave reflection.

James E Sharman1, Justin E Davies, Carly Jenkins

  • 1Department of Medicine, University of Queensland, Brisbane, Australia. James.Sharman@menzies.utas.edu.au

Hypertension (Dallas, Tex. : 1979)
|September 2, 2009
PubMed
Summary
This summary is machine-generated.

Augmentation index (AIx) is linked to heart rate and ejection duration, not left ventricular contractility. This study found AIx changes reflect chronotropic effects, challenging wave reflection theories.

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Published on: July 12, 2022

Area of Science:

  • Cardiovascular Physiology
  • Arterial Hemodynamics
  • Echocardiography

Background:

  • Augmentation index (AIx) is a mortality correlate influenced by left ventricular contractility and wave reflections.
  • Previous studies have not assessed AIx in relation to left ventricular contractility changes.
  • The prevailing wave reflection theory for AIx has been recently questioned.

Purpose of the Study:

  • To investigate arterial waveform changes in response to dobutamine-induced increases in left ventricular contractility and altered wave reflection.
  • To assess the relationship between AIx and left ventricular contractility (peak longitudinal systolic strain rate [SR]).
  • To evaluate the role of chronotropic and inotropic effects on AIx.

Main Methods:

  • Simultaneous radial tonometry for AIx and tissue Doppler echocardiography for SR in 50 patients.
  • Measurements were taken at rest and peak dobutamine stress.
  • Analysis included correlations between AIx, ejection duration, heart rate, and SR.

Main Results:

  • Dobutamine increased heart rate and SR, while decreasing AIx.
  • AIx showed significant associations with ejection duration and heart rate, but not with SR.
  • Heart rate-corrected SR was not associated with AIx, indicating no inotropic effect.
  • Ejection duration was the strongest independent correlate of AIx, explaining 78% of variance.

Conclusions:

  • AIx is primarily determined by chronotropic effects (heart rate) and ejection duration, not left ventricular inotropic function.
  • The findings challenge the current belief that AIx is significantly influenced by wave reflection timing.
  • Arterial waveform changes are more closely related to heart rate and ejection duration than to contractility changes.