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Severe labetalol overdose in an 8-month-old infant

Adalbjörn Thorsteinsson1, Astridur Johannesdottir, Herbert Eiríksson

  • 1Department of Anesthesiology and Intensive Care Medicine, Landspitali University Hospital, Reykjavik, Iceland. adalbjn@landspitali.is

Paediatric Anaesthesia
|March 4, 2008
PubMed

Insights

A severe labetalol overdose in an infant treated for aortic coarctation had minimal effects. This case highlights potential pharmacokinetic and pharmacodynamic factors influencing overdose outcomes in pediatric patients.

Area of Science:

  • Cardiology
  • Pharmacology
  • Pediatric Medicine

Background:

  • Postoperative hypertension is a common complication following surgical repair of coarctation of the aorta.
  • Labetalol, an alpha and beta-adrenergic blocker, is frequently used to manage such hypertension.
  • Accurate dosing is critical, especially in pediatric patients.

Observation:

  • An eight-month-old infant received a massive intravenous overdose of labetalol (17.2 mg/kg) after coarctation of the aorta repair.
  • Despite the extreme dose, the infant exhibited surprisingly limited adverse clinical effects.
  • The infant survived the medication error without significant sequelae.

Findings:

  • The unexpected tolerance to a large labetalol overdose suggests potential differences in pediatric pharmacokinetics or pharmacodynamics.
  • Investigating the metabolic pathways and receptor sensitivity in infants may explain the limited toxicity.
  • This case challenges typical overdose expectations for labetalol.

Implications:

  • Understanding the factors contributing to this tolerance could inform safer dosing strategies for labetalol in infants.
  • Further research into pediatric drug metabolism and response is warranted.
  • This case provides valuable insights into managing medication errors in pediatric cardiovascular surgery.

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