[Functional late potential analysis in the 24-hour electrocardiogram]

Area of Science:

• Cardiology
• Electrophysiology
• Medical Diagnostics

Context:

• Post-myocardial infarction patients are at risk for ventricular arrhythmias.
• Current risk stratification methods may not fully capture dynamic changes.
• The utility of repeated late potential analysis over 24 hours is not well-established.

Purpose:

• To investigate if repeated late potential analysis within 24 hours can detect functional changes.
• To determine if this repeated analysis is superior to a single analysis for identifying ventricular arrhythmias.
• To assess the variability of late potential appearance throughout the day and its association with ventricular arrhythmias.

Summary:

• Late potential analysis was performed on 120 post-infarction patients using 24-hour Holter ECGs, divided into 24 hourly segments.
• Late potentials were detected more frequently with repeated analysis, especially in patients with ventricular fibrillation (VF) or ventricular tachycardia (VT).
• Transitory late potentials were observed in VT patients during heart rate acceleration and reduced heart rate variability.

Impact:

• Repeated late potential analysis from Holter recordings aids in recognizing functional changes.
• This approach can enhance noninvasive risk stratification, particularly for post-infarction patients at risk of ventricular fibrillation.
• Improved identification of high-risk patients may lead to better clinical outcomes.