Sudden cardiac arrest in patients with preserved left ventricular systolic function: a clinical dilemma

Area of Science:

• Cardiology
• Electrophysiology
• Public Health

Background:

• Sudden cardiac arrest (SCA) in patients with preserved systolic function is a significant public health concern.
• Current guidelines for defibrillator implantation often overlook this patient group, who represent the majority of SCA cases.
• Identifying individuals at high risk for SCA is crucial for effective prevention strategies.

Purpose of the Study:

• To review current understanding of SCA in patients with preserved left ventricular systolic function.
• To explore the feasibility of risk stratification in this population.
• To propose a framework for predicting SCA risk.

Main Methods:

• Review of existing clinical risk scores for identifying high-risk individuals.
• Analysis of emerging data on T-wave alternans as a predictive index for SCA.
• Integration of various indices for a comprehensive risk assessment framework.

Main Results:

• Most individuals experiencing SCA have underlying structural heart disease, even if undiagnosed.
• T-wave alternans shows promise, alone or combined with other factors, in predicting SCA.
• Risk stratification for SCA in preserved systolic function patients is becoming increasingly feasible.

Conclusions:

• A significant gap exists in managing SCA risk for patients with preserved systolic function.
• T-wave alternans and clinical risk scores offer potential tools for improved risk stratification.
• Developing a robust framework is essential for guiding preventative strategies and defibrillator implantation decisions.