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ECG changes following cardioversion and defibrillation.

Florim Cuculi1, Richard Kobza, Paul Erne

  • 1Department of Cardiology, Kantonsspital Luzern, Luzern, Switzerland.

Swiss Medical Weekly
|November 9, 2007
PubMed
Summary
This summary is machine-generated.

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External defibrillation and cardioversion can cause temporary QRS voltage loss in patients, particularly those with coronary artery disease. This reversible phenomenon may be linked to tissue edema or myocardial stunning.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Changes in QRS amplitude after defibrillation/cardioversion are undocumented in humans.
  • Electrical cardioversion and defibrillation are common procedures for tachyarrhythmias.

Purpose of the Study:

  • To investigate and report the phenomenon of QRS voltage amplitude changes following external defibrillation or cardioversion.
  • To compare these changes in patients with and without coronary artery disease (CAD).

Main Methods:

  • Prospective analysis of patients undergoing external cardioversion/defibrillation.
  • Categorization into groups based on CAD/acute coronary syndrome (ACS) status and internal cardioverter defibrillator (ICD) use.
  • Serial ECG recordings to measure QRS amplitude sums (Sigma) and compare with baseline values.

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Main Results:

  • Significant QRS amplitude reduction observed, particularly in patients with CAD/ACS (-35% precordial, -16% peripheral R amplitude).
  • Reversible voltage loss noted, with changes appearing after 23 hours and resolving by 62 hours.
  • Most pronounced attenuation in patients with ACS, CAD, and those requiring chest compressions.

Conclusions:

  • A reversible loss of QRS voltage following external defibrillation/cardioversion is reported.
  • Potential causes include tissue edema from electrical/traumatic injury or myocardial stunning.
  • Further research with larger cohorts is needed to elucidate the exact pathophysiological mechanism.