Getting de Pointes Across: Isoproterenol for Refractory Methadone-Associated Torsades de Pointes in Alcohol Withdrawal

TL;DR

A young woman on high-dose methadone developed a dangerous heart rhythm disorder that was successfully treated with isoproterenol after other treatments failed.

Contribution

This case highlights isoproterenol as a potential treatment for torsades de pointes resistant to standard therapies in methadone users.

Findings

The patient's torsades de pointes did not respond to magnesium or lidocaine but resolved with isoproterenol.

The case underscores the need for careful risk assessment in methadone-treated patients.

Isoproterenol may be a viable option for refractory torsades de pointes in methadone-associated cases.

Abstract

Methadone is known to prolong the QTc interval and may precipitate torsades de pointes (TdP), particularly at higher doses and in the presence of additional risk factors. Standard management involves discontinuation of the offending agent, correction of electrolyte imbalances, and administration of intravenous magnesium; however, some patients may continue to experience recurrent TdP. We present a case of a young female on high-dose methadone, who developed TdP in the context of acute alcohol withdrawal and clonidine-associated bradycardia. Her arrhythmia persisted despite treatment with magnesium and lidocaine but resolved following initiation of an isoproterenol infusion. This case emphasizes the importance of systematic risk assessment in patients receiving methadone and supports the use of isoproterenol as a viable therapeutic option when TdP is refractory to first-line interventions.

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