Elizabeth Evans1, Libo Li1, Jeong Min2, David Huang1, Darren Urada1, Lei Liu3, Yih-Ing Hser1, Bohdan Nosyk2,4. 1. UCLA Integrated Substance Abuse Programs, Los Angeles, CA, USA. 2. British Columbia Centre for Excellence in HIV/AIDS, Vancouver, BC, Canada. 3. Northwestern University Feinberg School of Medicine, Chicago, IL, USA. 4. Simon Fraser University, Faculty of Health Sciences, Barnaby, BC, Canada.
Abstract
AIMS: To estimate mortality rates among treated opioid-dependent individuals by cause and in relation to the general population, and to estimate the instantaneous effects of opioid detoxification and maintenance treatment (MMT) on the hazard of all-cause and cause-specific mortality. DESIGN: Population-based treatment cohort study. SETTING: Linked mortality data on all individuals first enrolled in publicly funded pharmacological treatment for opioid dependence in California, USA from 2006 to 2010. PARTICIPANTS: A total of 32 322 individuals, among whom there were 1031 deaths (3.2%) over a median follow-up of 2.6 years (interquartile range = 1.4-3.7). MEASUREMENTS: The primary outcome was mortality, indicated by time to death, crude mortality rates (CMR) and standardized mortality ratios (SMR). FINDINGS: Individuals being treated for opioid dependence had a more than fourfold increase of mortality risk compared with the general population [SMR = 4.5, 95% confidence interval (CI) = 4.2, 4.8]. Mortality risk was higher (1) when individuals were out-of-treatment (SMR = 6.1, 95% CI = 5.7, 6.5) than in-treatment (SMR = 1.8, 95% CI = 1.6, 2.1) and (2) during detoxification (SMR = 2.4, 95% CI = 1.5, 3.8) than during MMT (SMR = 1.8, 95% CI = 1.5, 2.1), especially in the 2 weeks post-treatment entry (SMR = 5.5, 95% CI = 2.7, 9.8 versus SMR = 2.5, 95% CI = 1.7, 4.9). Detoxification and MMT both independently reduced the instantaneous hazard of all-cause and drug-related mortality. MMT preceded by detoxification was associated with lower all-cause and other cause-specific mortality than MMT alone. CONCLUSIONS: In people with opiate dependence, detoxification and methadone maintenance treatment both independently reduce the instantaneous hazard of all-cause and drug-related mortality.
AIMS: To estimate mortality rates among treated opioid-dependent individuals by cause and in relation to the general population, and to estimate the instantaneous effects of opioid detoxification and maintenance treatment (MMT) on the hazard of all-cause and cause-specific mortality. DESIGN: Population-based treatment cohort study. SETTING: Linked mortality data on all individuals first enrolled in publicly funded pharmacological treatment for opioid dependence in California, USA from 2006 to 2010. PARTICIPANTS: A total of 32 322 individuals, among whom there were 1031 deaths (3.2%) over a median follow-up of 2.6 years (interquartile range = 1.4-3.7). MEASUREMENTS: The primary outcome was mortality, indicated by time to death, crude mortality rates (CMR) and standardized mortality ratios (SMR). FINDINGS: Individuals being treated for opioid dependence had a more than fourfold increase of mortality risk compared with the general population [SMR = 4.5, 95% confidence interval (CI) = 4.2, 4.8]. Mortality risk was higher (1) when individuals were out-of-treatment (SMR = 6.1, 95% CI = 5.7, 6.5) than in-treatment (SMR = 1.8, 95% CI = 1.6, 2.1) and (2) during detoxification (SMR = 2.4, 95% CI = 1.5, 3.8) than during MMT (SMR = 1.8, 95% CI = 1.5, 2.1), especially in the 2 weeks post-treatment entry (SMR = 5.5, 95% CI = 2.7, 9.8 versus SMR = 2.5, 95% CI = 1.7, 4.9). Detoxification and MMT both independently reduced the instantaneous hazard of all-cause and drug-related mortality. MMT preceded by detoxification was associated with lower all-cause and other cause-specific mortality than MMT alone. CONCLUSIONS: In people with opiate dependence, detoxification and methadone maintenance treatment both independently reduce the instantaneous hazard of all-cause and drug-related mortality.
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