Benign persistent T-wave inversion mimicking ischemia after left bundle-branch block--cardiac memory.

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Deep T-wave inversions in precordial leads are often indicative of cardiac ischemia.
• However, certain conditions can mimic ischemic patterns, necessitating careful differential diagnosis.

Observation:

• This report details a case of significant T-wave inversions following the resolution of a rate-related left bundle-branch block.
• The observed T-wave inversions were deep, symmetrical, and present in the precordial leads.

Findings:

• The T-wave inversions were attributed to a phenomenon known as cardiac memory.
• Cardiac memory occurs when the heart exhibits transient T-wave changes after a period of aberrant conduction, such as bundle-branch block or ventricular pacing.

Implications:

• This case underscores that T-wave inversions, even when profound, may not always signify active myocardial ischemia.
• Understanding cardiac memory is crucial for accurate electrocardiographic interpretation and avoiding unnecessary interventions for non-ischemic findings.