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Risk stratification for sudden death: do we need anything more than ejection fraction?

Alfred E Buxton1

  • 1Brown Medical School, USA. Alfred_Buxton@Brown.edu

Cardiac Electrophysiology Review
|April 9, 2004
PubMed
Summary

Left ventricular ejection fraction (LVEF) is linked to mortality risk in heart disease patients. However, LVEF lacks sensitivity and specificity, making it unreliable for identifying patients at high risk and potentially leading to ineffective treatments.

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Area of Science:

  • Cardiology
  • Clinical Medicine
  • Prognostic Biomarkers

Background:

  • Left ventricular ejection fraction (LVEF) is recognized for its prognostic significance in various heart conditions.
  • A continuous inverse relationship exists between LVEF and mortality risk across diverse cardiac patient populations.
  • Despite statistical association, LVEF is one of many factors influencing patient mortality.

Purpose of the Study:

  • To evaluate the clinical utility of LVEF by assessing the sensitivity and specificity of its commonly used cut-points.
  • To determine the reliability of LVEF in identifying patients with chronic coronary artery disease at risk of mortality.
  • To analyze the cost-effectiveness of LVEF-guided interventions, such as implantable defibrillators.

Main Methods:

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  • Analysis of LVEF data in patients with chronic coronary artery disease.
  • Assessment of sensitivity and specificity of established LVEF cut-off values for mortality risk prediction.
  • Evaluation of the predictive accuracy of LVEF for mode of death.

    • Main Results:

    • LVEF demonstrates a lack of sensitivity in identifying patients at mortality risk.
    • The specificity of LVEF cut-points is questionable, particularly in chronic coronary artery disease.
    • A significant number of sudden cardiac deaths occur in patients with LVEF values above commonly used thresholds.

    Conclusions:

    • Reliance on LVEF alone for risk stratification in heart disease is clinically limited due to poor sensitivity and specificity.
    • LVEF is not a specific predictor of the mode of death, complicating treatment decisions.
    • LVEF-based selection for expensive technologies like implantable defibrillators may not be cost-effective.