Sudden Arrhythmic Death at the Higher End of the Heart Failure Spectrum

Area of Science:

• Cardiology
• Electrophysiology
• Heart Failure Research

Background:

• Sudden cardiac death (SCD) poses a significant risk to heart failure (HF) patients.
• Sudden arrhythmic death (SAD) is a primary cause of mortality in HF patients with reduced ejection fraction, managed with implantable cardioverter-defibrillators.
• Etiology and prevention of SCD in HF patients with near-normal/normal left ventricular ejection fraction (LVEF) remain less understood.

Purpose of the Study:

• To review the epidemiology of SCD in HF patients with preserved LVEF.
• To summarize the underlying mechanisms of SAD in this population.
• To propose a diagnostic and prevention strategy for SAD in HF with near-normal/normal LVEF.

Main Methods:

• Literature review of epidemiological data on SCD in HF.
• Synthesis of proposed mechanisms for SAD in HF with preserved LVEF.
• Development of a stepwise clinical approach for SAD prevention.

Main Results:

• The majority of out-of-hospital SCD cases occur in patients with unknown or normal/near-normal LVEF.
• Specific mechanisms contributing to SAD in this cohort require further elucidation.
• A structured diagnostic and therapeutic pathway is proposed for risk stratification and intervention.

Conclusions:

• HF patients with near-normal/normal LVEF are also at risk for SCD.
• Understanding the specific causes and implementing targeted prevention strategies are crucial.
• Further research is needed to refine diagnostic tools and therapeutic options for this patient group.