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Arrhythmias after astemizole overdose
1Department of Pediatrics, Children's Hospital of Michigan, Detroit, MI 48201, USA.
Pediatric Emergency Care
|April 1, 1996
Summary
Astemizole poisoning can cause dangerous heart rhythms like asystole and ventricular fibrillation. Early electrocardiogram monitoring is crucial for identifying patients at risk of these life-threatening arrhythmias.
Area of Science:
- Cardiology
- Clinical Toxicology
- Pharmacology
Background:
- Astemizole is a second-generation H1 receptor antagonist used for allergic conditions.
- Previous reports suggest a link between astemizole overdose and cardiac arrhythmias.
- Understanding the cardiac toxicity profile of astemizole is critical for patient management.
Observation:
- Two cases of astemizole poisoning are presented.
- Case 1: A patient experienced asystole progressing to ventricular fibrillation 11 hours post-ingestion, successfully treated with defibrillation.
- Case 2: A patient presented with an isolated finding of a prolonged corrected QT (QTc) interval.
Findings:
- Astemizole poisoning can precipitate severe ventricular arrhythmias, including asystole and ventricular fibrillation.
- A prolonged QTc interval may serve as an indicator of astemizole-induced cardiotoxicity.
- The onset of arrhythmias can be delayed, occurring several hours after ingestion.
Implications:
- Electrocardiogram (ECG) monitoring is essential in cases of astemizole poisoning to detect conduction abnormalities.
- Identifying patients with prolonged QTc intervals can help predict the risk of life-threatening cardiac events.
- Prompt recognition and monitoring can guide timely intervention and improve outcomes in astemizole-poisoned patients.