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Electrical storms and their prognostic implications.

Zahid Aslam Awan1, Mahmood ul Hassan, Kamran Bangash

  • 1Department of Cardiology, Postgraduate Medical Institute, Hayatabad Medical Complex, Peshawar, Pakistan. zahidccf@hotmail.com

Journal of Ayub Medical College, Abbottabad : JAMC
|October 9, 2010
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Electrical storms, frequent shocks from automatic implantable cardioverter-defibrillators (AICDs), are common in patients with coronary artery disease. Ischemia, electrolyte imbalances, and renal failure are key triggers, indicating a poor prognosis.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Sudden cardiac death prevention remains a challenge for electrophysiologists.
  • Automatic implantable cardioverter-defibrillators (AICDs) are crucial for managing fatal ventricular arrhythmias.
  • Frequent AICD shocks define an electrical storm, necessitating investigation into its causes and prevention.

Purpose of the Study:

  • To analyze the frequency of electrical storms in AICD recipients.
  • To identify precipitating factors contributing to electrical storms.
  • To explore strategies for preventing electrical storms.

Main Methods:

  • Retrospective analysis of 110 electrical storm episodes (668 shocks) in 25 AICD recipients.
  • Inclusion of ECG, echocardiography, and laboratory tests (electrolytes, urea, creatinine).
  • Minimum 24-hour hospitalization for all analyzed patients.

Main Results:

  • During a 3-year period, 50% of patients experienced more than two shocks within 24 hours.
  • Common predisposing factors included active ischemia, electrolyte imbalances, and renal failure.
  • Electrical storms were observed in patients with coronary artery disease and impaired left ventricular function.

Conclusions:

  • Electrical storms are frequent in patients with coronary artery disease and compromised left ventricular function.
  • Ischemia, electrolyte imbalances, and renal failure are significant predisposing factors.
  • Electrical storms serve as predictors of a poor prognosis in AICD recipients.