Comment in:

Ann Intern Med. 2003 Aug 19;139(4):W64.

Ann Intern Med. 2003 Aug 19;139(4):W64.

Ann Intern Med. 2003 Jul 15;139(2):E156.

Summary for patients in:

Ann Intern Med. 2002 Sep 17;137(6):I42.

Torsade de pointes associated with very-high-dose methadone.

Denver Health Medical Center, and The University of Colorado Health Sciences Center, Bannock Street, Mailcode 0960, Denver, CO 80204-4507, USA.

BACKGROUND: Methadone is an effective treatment for opioid dependency and chronic pain. A methadone derivative, levacetylmethadol, was withdrawn from the European market after being associated with torsade de pointes. To date, no association between methadone and this arrhythmia has been described. OBJECTIVE: To evaluate a series of methadone-treated patients experiencing torsade de pointes. DESIGN: Retrospective case series. SETTING: Methadone maintenance treatment programs in the United States and a pain management center in Canada. PATIENTS: 17 methadone-treated patients who developed torsade de pointes. MEASUREMENTS: Chart review for concomitant arrhythmia risk factors and quantification of corrected QT interval (QTc). RESULTS: The mean daily methadone dose was 397 +/- 283 mg, and the mean QTc interval was 615 +/- 77 msec. Fourteen patients had a predisposing risk factor for arrhythmia. A cardiac defibrillator or pacemaker was placed in 14 patients; all 17 patients survived. CONCLUSIONS: This series raises concern that very-high-dose methadone may be associated with torsade de pointes. Given the likely expansion of methadone treatment into primary care, further investigation of these findings is warranted.

PMID: 12230351 [PubMed - indexed for MEDLINE]