Latent Impulsivity Subtypes in Substance Use Disorders and Interactions with Internalizing and Externalizing...

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Substance use disorders (SUDs) frequently co-occur with other psychiatric conditions (CODs).
• Impulsivity is a key transdiagnostic trait in SUDs, but its subtypes and their clinical relevance remain underexplored.
• Understanding the interplay between impulsivity, SUDs, and CODs is vital for effective treatment.

Purpose of the Study:

• To investigate the clinical significance of latent impulsivity subtypes in individuals with SUDs and CODs.
• To assess how different impulsivity profiles influence the association between SUDs and CODs.
• To examine the heterogeneity of substance use severity across these subgroups.

Main Methods:

• Latent class analysis (LCA) was used to identify distinct impulsivity subtypes.
• A sample of 568 individuals undergoing residential treatment for SUDs was evaluated.
• Structured interviews and clinimetric measures assessed SUDs, CODs, impulsivity, and substance use severity.

Main Results:

• A four-class model of impulsivity emerged: overall high impulsivity (OHI), overall low impulsivity, high cognitive-low motor impulsivity, and moderate cognitive-low motor impulsivity (MC-LMI).
• OHI and MC-LMI classes included most individuals with CODs and exhibited greater substance use severity.
• The interaction between impulsivity subtypes and internalizing/externalizing CODs significantly modified substance use severity in complex ways.

Conclusions:

• Identifying specific impulsivity subtypes is essential for understanding clinical heterogeneity in SUDs with CODs.
• Neither trait-based impulsivity subtypes nor CODs alone adequately predict clinical outcomes.
• Analyzing the interactions between psychiatric disorders and behavioral traits is critical for a comprehensive understanding of SUDs.