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Ineffective ICD therapy due to excessive alcohol and exercise
Georgios I Papaioannou1, Jeffrey Kluger
1Division of Cardiology, Hartford Hospital, Connecticut 06102-5037, USA.
Pacing and Clinical Electrophysiology : PACE
|August 8, 2002
Summary
Excessive alcohol intake may lower defibrillation thresholds in patients with implantable cardioverter-defibrillators (ICDs), potentially leading to ineffective shocks for ventricular tachycardia. This case highlights a critical interaction between alcohol and ICD therapy.
Area of Science:
- Cardiology
- Electrophysiology
- Toxicology
Background:
- Implantable cardioverter-defibrillators (ICDs) are crucial for managing life-threatening ventricular arrhythmias.
- Defibrillation threshold (DFT) testing is essential to ensure ICD efficacy.
- The impact of alcohol consumption on DFTs in ICD patients remains incompletely understood.
Observation:
- A patient with dilated cardiomyopathy and an ICD experienced multiple unsuccessful shocks for ventricular tachycardia following excessive alcohol intake and exercise.
- Pre-event DFT testing showed low energy requirements for tachycardia termination.
- Post-event DFT testing confirmed persistently low energy requirements.
Findings:
- Excessive alcohol consumption appears to lower the energy required for ventricular tachycardia termination in this ICD patient.
- This finding supports previous animal studies suggesting a dose-dependent relationship between ethanol and defibrillation energy.
- Contradicts some human studies indicating no effect of modest alcohol intake on DFTs.
Implications:
- Excessive alcohol intake could precipitate life-threatening arrhythmias or lead to ICD failure in susceptible patients.
- Clinicians should counsel ICD patients about the potential risks associated with excessive alcohol consumption.
- Further research is warranted to elucidate the complex interaction between alcohol, cardiac electrophysiology, and ICD performance.