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Dissociation between improvement in left ventricular performance and functional class in patients with chronic heart

Pierre V Ennezat1, Caroline A Ennezat, Pugazhendhi Vijayaraman

  • 1Department of Medicine, Division of Cardiology, Albert Einstein College of Medicine, Bronx, New York 10461, USA, and Cardiology Hospital, Lille, France.

Journal of Cardiovascular Pharmacology
|August 24, 2005
PubMed

Insights

Improvements in left ventricular ejection fraction (LVEF) from beta-blockade or bypass surgery do not consistently improve functional capacity in heart failure patients. LVEF changes and functional class improvements were unrelated in this study.

Area of Science:

  • Cardiology
  • Heart Failure Research
  • Clinical Interventions

Background:

  • Resting left ventricular ejection fraction (LVEF) and functional capacity are key metrics in chronic heart failure (CHF).
  • Current CHF treatments (digitalis, diuretics, ACE inhibitors) do not show a correlation between LVEF and functional capacity.
  • The impact of significant LVEF improvement, potentially achieved through beta-blockade or coronary artery bypass graft (CABG) surgery, on functional class is not well-established.

Purpose of the Study:

  • To investigate whether substantial improvements in LVEF following long-term beta-blockade or CABG surgery lead to consistent improvements in functional class in CHF patients.
  • To determine the relationship between changes in LVEF and changes in functional class after these interventions.

Main Methods:

  • A prospective study involving 87 patients undergoing beta-blockade and 51 patients undergoing CABG surgery.
  • Doppler echocardiograms were used to assess LVEF at baseline and 12 months.
  • Functional class was assessed at baseline and 12 months for both intervention groups.

Main Results:

  • Beta-blockade showed variable effects on LVEF, with 52% experiencing significant improvement, but only 32% showed improved functional class; 68% remained unchanged or worsened.
  • CABG surgery also yielded variable LVEF changes, with 55% improving significantly, yet only 20% improved functional class; 80% remained unchanged or worsened.
  • No consistent relationship was found between LVEF changes and functional class improvements in either the beta-blockade or CABG surgery groups.

Conclusions:

  • Both beta-blockade and CABG surgery can improve LVEF in a majority of chronic heart failure patients.
  • Significant improvements in LVEF after these interventions do not consistently translate to enhanced functional capacity or improved functional class.
  • The dissociation between LVEF improvement and functional class highlights the complexity of managing heart failure and suggests other factors influence patient outcomes.

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