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A less aggressive therapeutic option for electrical storm.

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  • 1Division of Cardiology, San Martino University Hospital, Genoa, Italy.

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Electrical storm (ES), a dangerous heart rhythm, may stem from nerve regrowth after heart attack. Temporary pacing effectively controlled ES in two patients, suggesting a new treatment approach.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Surgery

Background:

  • Electrical storm (ES) is characterized by frequent ventricular fibrillation (VF) episodes requiring cardioversion.
  • Emerging research implicates Purkinje fiber network and sympathetic nerve regeneration in initiating malignant arrhythmias.
  • Acute myocardial infarction (MI) survivors are at risk for developing life-threatening ventricular arrhythmias.

Observation:

  • Two patients developed recurrent polymorphic ventricular tachycardia and VF post-MI and revascularization, triggered by premature ventricular contractions (PVCs).
  • Episodes were drug-refractory, necessitating intervention.
  • Temporary atrial overdrive pacing completely suppressed VF in both patients.

Findings:

  • Ventricular arrhythmia recurrence showed an inverse relationship with atrial pacing rate.
  • At a lower pacing rate of 60 bpm, neither PVCs nor VF recurred at one-month follow-up.
  • ES in these patients was likely linked to post-ischemic nerve sprouting and degeneration.

Implications:

  • High atrial pacing rates may suppress early afterdepolarizations and PVCs, thereby preventing ES.
  • Temporary overdrive pacing could be a viable alternative to radiofrequency ablation for managing early-phase ES post-MI.
  • This suggests a novel therapeutic strategy targeting nerve regeneration in managing electrical storm.