Digit-symbol performance in methadone-treated ex-heroin addicts

Area of Science:

• Neuroscience
• Psychology
• Pharmacology

Background:

• Methadone maintenance therapy (MMT) is a common treatment for opioid use disorder.
• Cognitive functions, particularly attention, may be affected by MMT.
• Understanding attention in MMT patients is crucial for treatment adherence and outcomes.

Purpose of the Study:

• To evaluate attention function in patients receiving high-dose methadone maintenance.
• To compare attention levels between working and nonworking patients on methadone maintenance.
• To investigate the relationship between methadone treatment duration and attention.

Main Methods:

• The Digit-Symbol Substitution Task (DSST) from the WAIS was administered.
• Participants included working (MW) and nonworking (MNW) patients on high-dose methadone maintenance.
• Two comparison groups were included for baseline data.

Main Results:

• The nonworking methadone group (MNW) exhibited significantly lower mean DSST scores compared to other groups.
• Despite lower scores, the MNW group's performance remained within the normal range.
• A positive correlation was found between DSST scores and the length of methadone treatment (11 months to 8 years).

Conclusions:

• Attention function, as measured by DSST, is generally preserved in patients on high-dose methadone maintenance.
• Nonworking status may be associated with a mild deficit in attention within this population.
• There is no evidence of cognitive deterioration in attention with increasing duration of methadone treatment.