Decreased milk drinking causing flecainide toxicity in an older child
Ben Thompson1, Jasveer Mangat, Chris Barton
1Institute of Child Health, University of Liverpool/Alder Hey Children's Hospital, Liverpool, Merseyside, UK.
BMJ Case Reports
|June 26, 2012
Summary
Reduced milk intake in a child led to increased flecainide levels and toxicity. This highlights the importance of dietary interactions for antiarrhythmic drug efficacy and safety in pediatric patients.
Area of Science:
- Pharmacology
- Cardiology
- Pediatrics
Background:
- Flecainide is a Class IC antiarrhythmic drug used for pediatric tachyarrhythmias.
- It functions by blocking cardiac sodium channels, slowing electrical conduction.
- Indications include supraventricular and ventricular tachycardias, and atrial fibrillation.
Observation:
- Paradoxical proarrhythmia is a known risk with flecainide in children.
- Evidence suggests milk may reduce flecainide absorption in infants.
- A case involved an older child with persistently subtherapeutic flecainide levels.
Findings:
- The child's flecainide levels normalized after reducing milk consumption.
- Following this dietary change, the child experienced severe flecainide toxicity.
- Increased flecainide levels correlated with the reduction in milk intake.
Implications:
- Dietary factors, specifically milk consumption, can significantly impact flecainide bioavailability in children.
- Close monitoring of flecainide levels and potential drug-food interactions is crucial for pediatric patients.
- This case underscores the need for individualized treatment approaches considering dietary habits in pediatric antiarrhythmic therapy.
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