Hung-Chi Wu

Change in Quality of Life and Its Predictors in Heroin Users Receiving Methadone Maintenance Treatment in Taiwan: An 18-Month Follow-Up Study

Background: A good quality of life (QOL) is associated with successful treatment in patients with opioid dependence. Therefore, it is of clinical benefit to examine what factors can predict a change in QOL among heroin users in the course of a methadone maintenance treatment (MMT) program. Objectives: This longitudinal study aimed to examine the patterns and predictors of change in QOL among heroin users during the period of an 18-month MMT program. Methods: A total of 368 intravenous heroin users receiving MMT in southern Taiwan between 2007 and 2008 were interviewed using the Taiwan version of the Brief Version of the World Health Organization Quality of Life Instrument (WHOQOL-BREF) at baseline and after 3, 6, 9, 12, 15, and 18 months of treatment. Demographic and substance-use characteristics, severity of heroin use, HIV serostatus, criminal record, and family function data were collected during baseline interviews. Data on methadone dosage at each follow-up point and the duration of retention in the MMT program were also collected. Results: Improvement in QOL was rapid during the first 3 months after initiation of MMT and slowed beyond the 3-month point. A higher dosage of methadone predicted a better QOL. In addition, longer retention in the program may be associated with a better QOL. Conclusions: The results supported the hypothesis that, regarding QOL, heroin users can benefit rapidly and continuously from a MMT. A higher dose of methadone and longer treatment may predict improvement in QOL. Scientific significance: Efforts are needed to amend the modifiable factors related to poor QOL for heroin users in MMT programs.

Gender Differences in Heroin Users Receiving Methadone Maintenance Therapy in Taiwan

This study examined gender differences in heroin users who first received MMT. Compared with men, female heroin users were younger and more likely to be unemployed, to have family members using illicit substances, to initiate heroin use at a younger age, to begin MMT earlier after starting heroin use, to have methamphetamine use, to initiate methamphetamine use at a younger age, and to report a child-raising burden and a prior history of traumatic experiences. Men were more likely to have use of betel quid, and to initiate alcohol, nicotine and betel quid use at a younger age than women.

Predictors for Dropping-Out From Methadone Maintenance Therapy Programs Among Heroin Users in Southern Taiwan

This study examined the methadone maintenance therapy (MMT) retention rates of heroin users in Taiwan and the predictors for dropout in the 18-month period after starting MMT. We consecutively recruited 368 intravenous heroin users receiving MMT in 2007–2008 and applied Cox proportional hazards regression analysis to determine the predictive effect of pre- and in-treatment variables on early discontinuation of MMT. The retention rate at 18 months was 32.3%. High heroin expenses, more severe harm caused by heroin use, perceived lower family support, and lower methadone dosage at 3 months after starting MMT increased the risk of dropout in the follow-up period.

Predictors of the severity of depressive symptoms among intravenous heroin users receiving methadone maintenance treatment in Taiwan: an 18-month follow-up study.

This 18-month follow-up study examined the predictors of the severity of depressive symptoms among intravenous heroin users receiving methadone maintenance treatment (MMT) in Taiwan. The severity of depressive symptoms in 368 intravenous heroin users receiving MMT in southern Taiwan was assessed using the Center for Epidemiological Studies Depression scale at baseline and at 3, 6, 9, 12, 15, and 18 months of treatment. Demographic and substance-using characteristics, severity of heroin use, HIV serostatus, criminal record, and family function were collected during baseline interviews. Data on methadone dosage at each follow-up interview and the duration of retention in the MMT program were also collected. A generalized estimating equation was used to determine independent predictors of depressive symptoms during the 18-month period of MMT. Female gender, lack of fixed employment, severe heroin use, concurrent methamphetamine use, low family function at baseline, heroin use during the MMT, low methadone dosage, and short duration of participation in MMT predicted more severe depressive symptoms during the 18-month MMT. This study found that sociodemographic and substance-using characteristics at baseline predicted the severity of depressive symptoms among heroin users receiving MMT. Methadone dosage and MMT duration were also predictive of depression severity. The predictors found in this study can be used to identify heroin users who are at risk for depressive symptoms in the MMT program.

Comparison of outcomes after 3-month methadone maintenance treatment between heroin users with and without HIV infection: a 3-month follow-up study

BackgroundThe aim of this study was to compare the changes in primary (heroin use-related) and secondary (depressive symptoms and quality of life, QOL) outcome indicators of 3-month methadone maintenance treatment (MMT) between heroin users with and without HIV infection.MethodsA total of 242 intravenous heroin-dependent individuals (30 with and 212 without HIV infection) receiving MMT were recruited. Primary (severity of heroin dependence, harm caused by heroin use and current heroin use) and secondary (depressive symptoms and QOL) outcome indicators were determined before and after receiving 3-month MMT. Changes in primary and secondary outcome indicators between the two groups were compared using mixed-model analysis.ResultsHeroin users both with and without HIV infection showed significant improvement in three primary outcome indicators after 3-month MMT, and there was no difference in the changes of these primary outcome indicators between the two groups. However, improvements in depressive symptoms and the physical domain of QOL among HIV-infected heroin users were poorer than in those without HIV infection.ConclusionsThe results of this study indicated that heroin users with HIV infection did improve in the primary but not the secondary outcomes after 3-month MMT.

Can Heroin-Dependent Individuals Benefit from a Methadone Maintenance Treatment Program before They Drop Out against Medical Advice? A 12-Month Follow-Up Study

Aim: Little is known about whether heroin-dependent individuals receiving methadone maintenance treatment (MMT) who were discharged involuntarily and against medical advice (DAMA) get benefits before they left. The aims of this 12-month follow-up study were to examine whether the effects of MMT on depressive symptoms, heroin dependence and quality of life (QOL) are different among the non-DAMA group, the DAMA group, and the involuntarily discharged group, as well as the time effect of receiving MMT on changes in these three outcome indicators. Method: A total of 266 individuals receiving MMT were divided into the non-DAMA group, the DAMA group, and the involuntarily discharged group. Participants were interviewed at baseline and at 3, 6, 9, and 12 months of treatment for levels of depressive symptoms, heroin dependence and QOL. Results: The levels of depressive symptoms, heroin dependence and QOL in all three groups improved after receiving MMT for 3 months and the improvement was maintained during the MMT period. There were no significant differences in the three outcome indicators among the three groups. Conclusion: The results support the concept that heroin-dependent individuals benefit from MMT, even if they do not want to stay in the program or drop out involuntarily.

Explicit and implicit heroin-related cognitions and heroin use among patients receiving methadone maintenance treatment

BACKGROUND Craving is an important issue in substance use disorder. To achieve a better understanding of the cognitive processing systems of craving, the cognitive processes of craving have been considered as two distinct processes. One system, based on rule-based inferences and named explicit cognition, is more conscious and effortful. The other system, based on prior learned association and named implicit cognition, is unconscious and effortless. How explicit and implicit cognitions are associated with heroin use in patients with methadone maintenance treatment (MMT) is not clear. This study aimed to explore the relationship between explicit and implicit cognition and heroin use in patients undergoing MMT. METHOD This study recruited one-hundred forty intravenous heroin users. The participants were invited to provide social-demographic data, the severity of substance dependence and explicit cognition with regard to heroin. Then, participants completed a computerized test to assess implicit cognition with regards to heroin. RESULTS This study found that explicit and implicit heroin-related cognitions were associated with the frequency of heroin use. There was an interaction effect between implicit and explicit cognition on the frequency of heroin use. This study also found that higher explicit heroin-related cognition was a risk factor for continuing heroin use. CONCLUSION Both explicit and implicit cognitions were associated with the frequency of heroin use in patients undergoing MMT, but only explicit cognition was associated with whether patients could stop using heroin during MMT. Therefore, the status of heroin use in patients undergoing MMT may be related to different cognitive processes.

Gender and Age Effects on the Trajectory of Depression in Opioid Users during Methadone Maintenance Treatment

Introduction Both heroin use and depression are significant health problems. Methadone maintenance treatment (MMT) can be of great benefit to heroin users. However, changes in the level of depression in heroin users during MMT are not clear. Gender and age are also important factors in the development of depression, and whether gender and age moderate changes in depression in heroin users during MMT warrants further study. This study aimed to explore: (1) the trajectory of depression in opioid users during MMT and (2) the moderating effects of gender and age on the trajectory of depression in opioid users receiving MMT. Method A total of 294 intravenous heroin users were recruited into this 9-month observational study. The level of depression was measured at the intake interview and at follow-up interviews every 3 months. A latent growth model was used to analyze the trajectory of the level of depression among the participants. Results Depression improved rapidly during the first 3 months of MMT and slowly after the first 3 months in both the female and male heroin users. There was no gender difference in the level of depression at each follow-up point. The level of depression in the female heroin users decreased faster than that in the male heroin users. In addition, the level of depression in the younger heroin users decreased faster than that in the older subjects. Conclusion Depression in female and younger heroin users improved more rapidly than in male and older subjects, respectively.

Altered gray matter volume and disrupted functional connectivity of dorsolateral prefrontal cortex in men with heroin dependence: DLPFC in heroin use disorder

Chronic heroin use can cause various neuropathological characteristics that may compromise brain function. The present study evaluated the alteration of gray matter volume (GMV) and its resting‐state functional connectivity (rsFC) over the dorsolateral prefrontal cortex (DLPFC) among male heroin users.

Factors affecting the dose of methadone among patients receiving methadone maintenance therapy in Taiwan: Sleep Disturbance and Methadone

BACKGROUND Methadone maintenance treatment (MMT) has been shown to be an effective therapeutic strategy for opioid users. This study aimed to investigate the predictive effect of clinically predominant sleep disturbance (CPSD) on the dose of methadone among opiate users receiving MMT during a follow-up period of 6 years in Taiwan. METHODS This retrospective study included 1,290 individuals with opioid dependence who visited our MMT clinic for the first time. Generalized estimating equations were used to analyze the effect of CPSD on the daily dose of methadone by controlling for the effects of demographic and MMT characteristics. RESULTS A total of 469 (36.4%) participants were comorbid with CPSD. After controlling for the effects of demographic and MMT characteristics, the participants comorbid with CPSD had a higher dose of daily methadone than those without CPSD (estimate: 7.03, p < .001). Furthermore, younger age (estimate: -1.22, p < .001), older age at initial MMT (estimate: .44, p < .001), lower educational level (estimate: -.90, p = .003) and lower attendance rates (estimate: -.14, p = .033) are significantly related to higher doses of daily methadone. CONCLUSIONS AND SCIENTIFIC SIGNIFICANCE Our study provided a naturalistic observation of the cohort for long period, along with a large sample size which could reflect clinical practice in the real world. We reported that a higher daily dose of methadone was significantly associated with CPSD after controlling for the effects of other factors. CPSD should be routinely surveyed among heroin users receiving MMT. (Am J Addict 2018;27:225-230).