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Two hearts and one defibrillator.

Peter Ott1, Julia H Indik

  • 1Sarver Heart Center, University of Arizona Health Sciences Center, Tucson, Arizona 85724, USA. ottp@u.arizona.edu

Journal of Cardiovascular Electrophysiology
|October 16, 2004
PubMed
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A patient with a transplanted heart experienced dangerous ventricular fibrillation during defibrillator testing. To prevent this, defibrillator shocks must be timed to the donor heart's R wave for patient safety.

Area of Science:

  • Cardiology
  • Cardiac Electrophysiology
  • Transplant Surgery

Background:

  • Heterotopic heart transplantation involves implanting a donor heart alongside the recipient's native heart.
  • Implantable cardioverter-defibrillators (ICDs) are used to treat life-threatening cardiac arrhythmias.
  • ICDs require periodic generator changes to maintain function.

Observation:

  • During an ICD generator change, defibrillation testing was performed on a patient with a heterotopic heart transplant.
  • Ventricular fibrillation, a critical arrhythmia, was unexpectedly induced in the donor heart during testing.
  • The native heart's electrical activity did not prevent the complication in the donor heart.

Findings:

  • Defibrillation testing in patients with heterotopic heart transplants can pose unique risks.

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  • The electrical activity of the donor heart is critical during defibrillation testing.
  • Synchronization of ICD shocks to the donor heart's R wave is essential to prevent induced ventricular fibrillation.

    • Implications:

    • Clinicians must consider the specific electrical properties of the donor heart in heterotopic transplant recipients when programming ICDs.
    • Defibrillation protocols need to be adapted for patients with heterotopic heart transplants to ensure safety.
    • This case highlights the importance of tailored defibrillator management in complex cardiac scenarios.