Neurocognitive Functions in Patients with Comorbid Hepatitis C and Opioid Dependence: A Comparative Study

Area of Science:

• Neuroscience
• Infectious Diseases
• Psychiatry

Background:

• Hepatitis C virus (HCV) infection frequently co-occurs with opioid dependence (OD).
• Understanding the neurocognitive impact of HCV in OD is crucial for effective treatment.

Purpose of the Study:

• To compare neurocognitive functions between opioid-dependent individuals with and without HCV.
• To assess the specific cognitive deficits associated with HCV infection in the context of opioid dependence.

Main Methods:

• Recruited 40 adult subjects per group: HCV(+) OD, HCV(-) OD, and healthy controls (HC).
• Administered a battery of neurocognitive tests including SPM, IGT, and N-back tests after one week of opioid abstinence.
• Adjusted for age and education; effect size calculated using Cohen's D.

Main Results:

• HCV(+) individuals showed significantly poorer performance on the Standard Progressive Matrices (SPM) compared to HCV(-) individuals.
• Both HCV(+) and HCV(-) groups performed worse than controls on the Iowa Gambling Task (IGT) and visual N-back tests (NBT), with HCV(+) exhibiting larger effect sizes.
• HCV(+) individuals also had higher error scores on verbal NBT compared to controls.

Conclusions:

• Chronic HCV infection leads to poorer general intellectual ability and reasoning in opioid-dependent individuals.
• HCV exacerbates cognitive dysfunction in decision-making and visual working memory among opioid-dependent individuals.