Bupropion-associated QRS prolongation unresponsive to sodium bicarbonate therapy

Area of Science:

• Cardiology
• Clinical Toxicology
• Pharmacology

Background:

• Bupropion is an antidepressant medication with stimulant properties.
• Overdoses of bupropion can lead to serious toxic effects, including seizures and cardiac abnormalities.
• The mechanism underlying bupropion's cardiotoxicity is not fully understood but may involve sodium channel blockade.

Observation:

• A case of bupropion overdose presenting with significant QRS prolongation is described.
• The QRS prolongation represented a delay in ventricular depolarization, indicating impaired cardiac conduction.
• Standard overdose management with intravenous sodium bicarbonate bolus therapy was administered.

Findings:

• The bupropion-associated QRS prolongation did not respond to intravenous sodium bicarbonate.
• This lack of response contrasts with the typical management of QRS prolongation caused by other sodium channel blockers, such as tricyclic antidepressants.
• The findings suggest a potentially different or more complex mechanism of cardiotoxicity in bupropion overdose.

Implications:

• Bupropion overdose may require alternative or adjunctive treatment strategies beyond standard sodium bicarbonate therapy.
• Further research is needed to elucidate the specific mechanisms of bupropion-induced cardiac conduction delays.
• Clinicians should be aware of the potential for refractory QRS prolongation in bupropion overdose cases.