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

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:

• 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.