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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

Comparative value of single-beat load-independent contractility indices in dilated cardiomyopathy and mitral

Zoran B Popović1, Milan Vuković, Neil Greenberg

  • 1Cardiovascular Imaging Center, The Cleveland Clinic Foundation, Ohio 44195, USA.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|July 2, 2003
PubMed

Insights

Single-beat contractility indices decrease in dilated cardiomyopathy but behave differently in mitral regurgitation (MR). This study compared various indices to understand their responses in these conditions.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Accurate assessment of left ventricular contractility is crucial for diagnosing and managing heart conditions.
  • Single-beat indices offer a non-invasive method for estimating contractility, but their reliability in specific pathologies like mitral regurgitation (MR) requires further investigation.

Purpose of the Study:

  • To compare the performance of various single-beat indices for estimating left ventricular contractility.
  • To evaluate how these indices behave in patients with dilated cardiomyopathy and mitral regurgitation (MR).

Main Methods:

  • Echocardiography and carotid tonometry were used to record hemodynamic data in control subjects, patients with dilated cardiomyopathy, and patients with MR.
  • Numerical simulations were employed to generate data under varying conditions of contractility, compliance, and MR.
  • Several single-beat contractility indices were calculated, including normalized systolic elastance, bilinearly approximated elastance, preload-recruitable stroke work, and preload-adjusted maximal power.

Main Results:

  • Both normalized systolic elastance and bilinearly approximated elastance were significantly reduced in patients with dilated cardiomyopathy and MR.
  • Preload-recruitable stroke work and preload-adjusted maximal power decreased only in patients with dilated cardiomyopathy.
  • Simulations demonstrated that differing behaviors of these indices are attributable to changes in MR or ventricular compliance.

Conclusions:

  • Single-beat indices generally decrease in dilated cardiomyopathy.
  • The behavior of single-beat indices differs significantly in the presence of mitral regurgitation (MR) compared to dilated cardiomyopathy.
  • These findings highlight the importance of considering the specific cardiac condition when interpreting single-beat contractility estimates.
Abstract

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