# IL-6 Expression and the Confidence Interval-Based Estimation of Relevance (CIBER) Help Identify Persistent Inflammation and Cognitive Parameters of Executive Dysfunction in the Withdrawal Phase of Male Polydrug Abusers

## TL;DR

This study finds that elevated IL-6 levels and poor cognitive flexibility are linked to executive dysfunction in male polydrug abusers during withdrawal.

## Contribution

The study introduces the use of the CIBER model to identify cognitive flexibility as a sensitive indicator of executive dysfunction in SUD patients.

## Key findings

- The Wisconsin Card Sorting Test showed the largest cognitive differences between SUD patients and controls.
- Elevated IL-6 levels and executive dysfunction persist in SUD patients during withdrawal.
- Cognitive flexibility is the most sensitive parameter of executive dysfunction in SUD patients.

## Abstract

Background/Objectives: Individuals diagnosed with substance use disorders (SUD) exhibit notable deficits in executive function (EFs). Notably, the pro-inflammatory cytokine interleukin-6 (IL-6) has been associated with cognitive impairments in individuals with substance use disorders. The specific neuropsychological parameters most affected by executive dysfunction remain poorly understood. Methods: In this study, sixteen patients diagnosed with SUD in the withdrawal phase were compared to twenty age-matched control subjects to ascertain which aspects of EFs were most adversely impacted. Plasma levels of IL-6 were quantified using enzyme-linked immunosorbent assay (ELISA). Data were analyzed using the Confidence Interval-Based Estimation of Relevance (CIBER) model to determine the most sensitive executive performance indicators. Results: Findings from the CIBER analysis revealed that the Wisconsin Card Sorting Test yielded the most pronounced cognitive discrepancies between males with and without SUD diagnoses. Elevated levels of IL-6 and associated executive dysfunction were observed to persist in males with SUD throughout the withdrawal phase. Conclusions: Notably, cognitive flexibility emerged as the most sensitive parameter indicative of executive dysfunction, suggesting its potential utility in tailoring clinical interventions for SUD patients during this critical recovery period.