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Loperamide-induced cardiotoxicity: a case overlooked?

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Loperamide overdose can cause dangerous heart rhythms, like Torsades de Pointes, and seizures. Prompt diagnosis and supportive care are crucial for recovery from this severe drug toxicity.

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Area of Science:

  • Cardiology
  • Toxicology
  • Emergency Medicine

Background:

  • Loperamide, an over-the-counter medication, is increasingly misused for its opioid-like effects.
  • Overdose can lead to severe cardiovascular and neurological complications.

Observation:

  • A young male presented with seizures and recurrent polymorphic ventricular tachycardia (PMVT)/Torsades de Pointes (TdP).
  • Extensive initial testing was unrevealing.
  • Detailed history revealed chronic, high-dose loperamide consumption (over 100 tablets/day for 1 year).

Findings:

  • The patient exhibited a prolonged QT interval on ECG, consistent with acquired Long QT Syndrome (LQTS).
  • Loperamide-induced cardiotoxicity was suspected as the cause of arrhythmias and seizures.
  • Supportive care, including mechanical ventilation and pacing, led to complete recovery.

Implications:

  • This case highlights the potential for severe cardiotoxicity and seizures from loperamide overdose.
  • Emphasizes the need for increased awareness of loperamide's dangers and the safety of OTC medications.
  • Underscores the importance of a systematic diagnostic approach in critical care settings.