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In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
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Relation of ventricular-vascular coupling to exercise capacity in ischemic cardiomyopathy: a cardiac multi-modality

Raymond C Wong1, Carlos A Dumont, Bethany A Austin

  • 1Department of Cardiovascular Medicine/F15, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, 44195, USA, rwongcc@gmail.com.

The International Journal of Cardiovascular Imaging
|October 14, 2009
PubMed

Insights

Ventricular-vascular coupling (VVC) noninvasively measured at rest predicts exercise capacity in advanced heart failure patients. Higher VVC correlates with better exercise tolerance and may guide future therapeutic interventions.

Area of Science:

  • Cardiology
  • Physiology
  • Biomedical Engineering

Background:

  • Advanced heart failure, including ischemic CMP, significantly impairs exercise capacity.
  • Traditional determinants of exercise capacity may not fully capture the complex interplay between the heart and vasculature.
  • Ventricular-vascular coupling (VVC) offers a novel perspective on cardiovascular function.

Purpose of the Study:

  • To investigate the relationship between noninvasive VVC measurements and exercise tolerance in patients with ischemic CMP.
  • To compare the predictive value of VVC against traditional exercise capacity determinants.
  • To explore VVC as a potential therapeutic target in heart failure.

Main Methods:

  • 43 patients with ischemic CMP underwent cardiopulmonary exercise testing, echocardiography, and cardiac magnetic resonance (CMR).
  • VVC was calculated as the ratio of ventricular systolic elastance (Ees) to arterial elastance (Ea).
  • Statistical analyses included correlation and stepwise multivariate analysis.

Main Results:

  • VVC significantly correlated with heart rate, peak exercise systolic blood pressure, maximum oxygen consumption (MVO(2)), and peak O(2) pulse.
  • Higher VVC was associated with improved left and right ventricular ejection fractions (LVEF, RVEF) but inversely related to mitral E wave velocity.
  • VVC emerged as the sole independent predictor of peak O(2) pulse in multivariate analysis.

Conclusions:

  • Resting VVC is a clinically significant parameter for predicting exercise capacity in advanced heart failure.
  • VVC may serve as an additional target for therapeutic interventions aimed at improving outcomes in these patients.
  • Noninvasive VVC assessment provides valuable insights beyond traditional measures of cardiac function and exercise performance.

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