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Pericardial effusion increases defibrillation energy requirement

R K Thakur1, J J Souza, P J Troup

  • 1Division of Cardiology, Medical College of Wisconsin, Milwaukee.

Pacing and Clinical Electrophysiology : PACE
|June 1, 1993
PubMed
Summary

Pericardial effusion significantly increases the energy needed for successful defibrillation (E80) in dogs, impacting implantable defibrillator performance. This fluid buildup may explain early device failures.

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Area of Science:

  • Cardiovascular Physiology
  • Electrophysiology

Background:

  • Pericardial effusion, fluid around the heart, can alter electrical conductivity.
  • Increased defibrillation energy requirements are a potential complication.

Purpose of the Study:

  • To investigate the impact of pericardial effusion on defibrillation energy requirements using monophasic and biphasic waveforms.
  • To determine if pericardial effusion affects transthoracic impedance and defibrillation efficacy.

Main Methods:

  • Seven dogs underwent induced pericardial effusion via saline instillation.
  • Monophasic and biphasic electrical shocks were delivered at varying voltages.
  • Defibrillation efficacy curves and impedance were measured before and after effusion induction.

Main Results:

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  • Pericardial effusion significantly decreased impedance (P < 0.01).
  • Energy for 80% successful defibrillation (E80) increased for both monophasic (16.0 to 18.5 J) and biphasic (10.6 to 13.0 J) shocks (P < 0.016).
  • Impedance and E80 returned to baseline after effusion removal.

Conclusions:

  • Pericardial effusion increases defibrillation energy requirements.
  • This finding may explain early failures in patients with implantable cardioverter-defibrillators.
  • Managing pericardial effusion could be crucial for defibrillator efficacy.