Benign vs. malignant inferolateral early repolarization: Focus on the T wave.

Area of Science:

• Cardiology
• Electrophysiology
• Medical Diagnostics

Background:

• Inferolateral early repolarization (ER) is common and linked to idiopathic ventricular fibrillation (VF).
• Differentiating malignant from benign ER is crucial for risk stratification.

Purpose of the Study:

• To investigate T-wave parameters for distinguishing malignant ER from benign ER.
• To identify ECG markers associated with increased risk of VF in ER patients.

Main Methods:

• Compared ECGs of patients with ER and VF (n=92) to asymptomatic ER controls (n=247).
• Assessed J-wave amplitude, QTc interval, T-wave/R-wave (T/R) ratio, and low-amplitude T waves.
• Utilized logistic regression to identify predictors of malignant ER.

Main Results:

• The VF group exhibited longer QTc intervals, higher J-wave amplitudes, and a higher prevalence of low-amplitude T waves compared to controls.
• A lower T/R ratio was significantly associated with malignant ER.
• Logistic regression identified QTc interval, J-wave amplitude, T/R ratio, low-amplitude T waves, and inferior lead J waves as predictors of malignant ER.

Conclusions:

• Malignant ER is characterized by a higher prevalence of low-amplitude T waves, lower T/R ratio, and longer QTc interval.
• Combining these T-wave parameters with J-wave characteristics can improve the identification of malignant ER.
• These findings aid in risk stratification for patients with early repolarization.