Abstract:
OBJECTIVES:To prospectively evaluate QTc changes among methadone maintenance treatment (MMT) patients. METHODS:All 512 opiate addicts newly admitted to 2 MMT clinics had been prospectively studied for 4.5 years. Ninety-one patients were excluded because they were admitted from other MMTs, and 26 were excluded because their first electrocardiogram was performed following 28 days in MMT; therefore, 421 were studied. QTc values were again performed either after (A) a steady methadone dose for at least 3 months and negative urine tests for opiates, cocaine, amphetamines, cannabis, benzodiazepine; or after (B) same as for (A) but with positive urine tests for cannabis and/or benzodiazepine. RESULTS:Mean QTc intervals were not related to benzodiazepine or cocaine use on admission. QTc interval was significantly prolonged from the baseline to steady methadone dose (424.5 ± 23.2 ms and 438.6 ± 26.6 ms, respectively) but not affected by methadone dose (<100 or ≥100 mg/d) or by the time to achieve a steady methadone dose (between 3 months and >2 years). QTc prolongation was greater among patients whose urine tested positive for benzodiazepine on a steady dose (P = 0.003). No additional prolongation was observed in 49 patients who achieved a steady methadone dose less than 1 year in MMT and had additional follow-up. Two patients who were benzodiazepine abusers died for undefined reasons. CONCLUSIONS:There is significant QTc prolongation during early MMT with no apparent clinical significance. A combination of benzodiazepine and methadone should be monitored.
journal_name
J Addict Medjournal_title
Journal of addiction medicineauthors
Peles E,Linzy S,Kreek MJ,Adelson Mdoi
10.1097/ADM.0b013e3182a8a4f2subject
Has Abstractpub_date
2013-11-01 00:00:00pages
428-34issue
6eissn
1932-0620issn
1935-3227journal_volume
7pub_type
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