A new paradigm for physiologic ventricular pacing

Area of Science:

• Cardiology
• Electrophysiology
• Biomedical Engineering

Background:

• Conventional right ventricular apex (RVA) pacing is linked to ventricular desynchronization, negatively impacting cardiac function.
• This desynchronization increases long-term cardiac morbidity and mortality, even in patients with initially normal heart function.
• Pathophysiological research confirms that RVA pacing leads to abnormal contractions, reduced pump efficiency, and cardiac remodeling.

Purpose of the Study:

• To introduce a new paradigm for individualized ventricular pacing to achieve more physiologic cardiac activation.
• To guide optimization of pacing strategies based on patient-specific conditions like atrioventricular block (AVB) and conduction abnormalities.
• To emphasize the importance of tailored pacing to minimize risks associated with ventricular pacing.

Main Methods:

• Review of clinical trial evidence and pathophysiological research on the effects of ventricular pacing.
• Analysis of outcomes associated with conventional RVA pacing versus alternative pacing sites and modes.
• Development of a patient-tailored pacing strategy framework.

Main Results:

• Ventricular desynchronization from RVA pacing poses a significant risk for heart failure and adverse cardiac events.
• Atrial-based pacing is preferred in patients without AVB or intraventricular conduction abnormalities.
• Alternative pacing strategies (single-site RV, LV, or biventricular pacing) may offer advantages over RVA pacing in patients with AVB.

Conclusions:

• Individualized ventricular pacing strategies are crucial for optimizing cardiac function and reducing long-term risks.
• Pacing optimization efforts should be intensified in patients with anticipated long pacing durations, compromised cardiac function, or significant mechanical dyssynchrony.
• Regular monitoring of cardiac pump function and mechanical synchrony is recommended for all patients with ventricular pacing.