Cardiomyopathy With Frequent Ventricular Premature Depolarization – Predicting Irreversible Ventricular Dysfunction

Area of Science:

• Cardiology
• Electrophysiology
• Cardiomyopathy Research

Background:

• High burden of ventricular premature depolarization (VPD) is linked to left ventricular (LV) dysfunction.
• LV dysfunction typically resolves post-ablation, but some patients experience persistent dysfunction.
• Identifying predictors of irreversible LV cardiomyopathy (CMP) is crucial for patient outcomes.

Purpose of the Study:

• To identify factors predicting irreversible left ventricular (LV) cardiomyopathy (CMP) in patients with frequent ventricular premature depolarization (VPD).
• To evaluate the role of left ventricular end-diastolic dimension (LVEDD) in predicting persistent LV dysfunction after successful VPD suppression.

Main Methods:

• Retrospective analysis of 57 patients with frequent VPD (>10%/day) undergoing successful radiofrequency (RF) ablation.
• Patients were categorized based on LV function normalization post-ablation using transthoracic echocardiography (TTE).
• Comparison of clinical, electrocardiographic, and TTE parameters, focusing on LV dimensions (LVEDD, LVESD).

Main Results:

• Significant differences in pre-ablation LVEDD and LV end-systolic dimension between groups with reversible and irreversible LV dysfunction.
• Pre-suppression LVEDD ≤66 mm was observed in all patients with reversible CMP.
• LVEDD >66 mm demonstrated high specificity (100%) and positive predictive value (100%) for irreversible CMP.

Conclusions:

• Left ventricular end-diastolic dimension (LVEDD) is a significant predictor of irreversible left ventricular cardiomyopathy (LV CMP) in patients with frequent ventricular premature depolarization (VPD).
• An LVEDD >66 mm effectively predicts irreversible CMP with high specificity after successful VPD suppression.