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Reduced mortality in patients with extended duration of methadone maintenance treatment: a five-year retrospective nationwide study

Published online by Cambridge University Press:  20 May 2021

Chieh-Liang Huang
Affiliation:
Ph.D. Program for Aging, College of Medicine, China Medical University, Taichung, Taiwan School of Medicine, China Medical University, Taichung, Taiwan Tsaotun Psychiatric Center, Ministry of Health and Welfare, Nan-Tou County, Taiwan
I-Ju Tsai
Affiliation:
Center for Drug Abuse and Addiction, China Medical University Hospital, China Medical University, Taichung, Taiwan Management Office for Health Data, China Medical University Hospital, China Medical University, Taichung, Taiwan
Wen-Chi Lin
Affiliation:
Center for Drug Abuse and Addiction, China Medical University Hospital, China Medical University, Taichung, Taiwan
Cheng-Li Lin
Affiliation:
Management Office for Health Data, China Medical University Hospital, China Medical University, Taichung, Taiwan
Ing-Kang Ho
Affiliation:
Ph.D. Program for Aging, College of Medicine, China Medical University, Taichung, Taiwan School of Medicine, China Medical University, Taichung, Taiwan Center for Drug Abuse and Addiction, China Medical University Hospital, China Medical University, Taichung, Taiwan Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
Ruey-Yun Wang
Affiliation:
Department of Public Health, China Medical University, Taichung, Taiwan
Cynthia Wei-Sheng Lee*
Affiliation:
Center for Drug Abuse and Addiction, China Medical University Hospital, China Medical University, Taichung, Taiwan Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
*
Author for correspondence: Cynthia Wei-Sheng Lee, E-mail: T22529@mail.cmuh.org.tw; cindywslee@gmail.com

Abstract

Background

The retention of patients under methadone maintenance treatment (MMT) is an indication for the effectiveness of the therapy. We aimed to explore the relation between mortality and the cumulative MMT duration.

Methods

A retrospective cohort analysis was performed using Taiwan Illicit Drug Issue Database (TIDID) and National Health Insurance Research Database (NHIRD) during 2012–2016. We included 9149 and 11 112 MMT patients as the short and long groups according to the length of their cumulative MMT duration, 1–364 and ⩾365 days, respectively. The risk of mortality was calculated by Cox proportional hazards regression model with time-dependent exposure to MMT, and the survival probability was plotted with the Kaplan-Meier curve.

Results

The mortality rates were 2.51 and 1.51 per 100 person-years in the short and long cumulative MMT duration groups, respectively. After adjusting for on or off MMT, age, sex, marital status, education level, maximum methadone dose, and comorbidities (human immunodeficiency virus, depression, hepatitis C virus, hepatitis B virus, alcoholic liver disease, and cardiovascular disease), the long group had a lower risk of death (hazard ratio = 0.67; 95% confidence interval 0.60–0.75) than the short group. Increased risk was observed in patients with advanced age, being male, unmarried, infected by HIV, HCV, and HBV, and diagnosed with depression, ALD, and CVD. Causes of death were frequently related to drug and injury.

Conclusions

Longer cumulative MMT duration is associated with lower all-cause and drug-related mortality rate.

Type
Original Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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Footnotes

Previous presentation: Cynthia Wei-Sheng Lee, Ruey-Yun Wang, Wen-Chi Lin, I-Ju Tsai, Ing-Kang Ho, Chieh-Liang Huang (2019). Association of Mortality and Duration of Methadone Maintenance Treatment: a Retrospective Nationwide Study in Taiwan. In: 2019 Annual Conference of Taiwanese Society of Addiction; 27 October 2019; Taoyuan Psychiatric Center, Taoyuan, Taiwan. Abstract nr P12.

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