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Related Experiment Videos

Cardiac memory-persistent T wave changes after ventricular pacing.

James C Kolb1

  • 1Department of Emergency Medicine, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505, USA.

The Journal of Emergency Medicine
|October 3, 2002
PubMed
Summary
This summary is machine-generated.

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Cardiac memory causes T wave inversions mimicking ischemia on EKGs, often after pacemaker use. Recognizing this benign condition can prevent unnecessary cardiac work-ups.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Cardiac memory is a poorly understood phenomenon where T wave inversions on an electrocardiogram (EKG) resemble signs of myocardial ischemia.
  • These EKG changes can persist even after normal heart rhythm returns, particularly following cardiac pacing.

Observation:

  • Persistent deep T wave inversions are noted in leads that previously showed normal T waves before pacing.
  • This phenomenon is commonly associated with artificial pacemakers but can also occur with other conditions causing abnormal ventricular depolarization, like intermittent left bundle branch block.

Findings:

  • The T wave inversions characteristic of cardiac memory can be mistaken for ischemic changes.
  • While ischemia must be prioritized, cardiac memory represents a benign entity.

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Implications:

  • Awareness of cardiac memory can help clinicians avoid unnecessary diagnostic procedures and hospital admissions for patients.
  • Definitive diagnosis can be challenging in the Emergency Department, especially in patients with pacemakers and co-existing coronary artery disease, often requiring retrospective confirmation after ruling out ischemia.