Modeling associations between posttraumatic stress symptoms and substance use

Area of Science:

• Psychiatry
• Psychology
• Neuroscience

Background:

• Comorbid substance use disorders (SUD) and posttraumatic stress disorder (PTSD) are linked to worse treatment outcomes.
• The self-medication hypothesis suggests SUD and PTSD symptoms influence each other.
• Detailed longitudinal research on SUD and PTSD symptom interplay is lacking.

Purpose of the Study:

• To examine the week-by-week associations between PTSD and substance dependence (SD) symptoms.
• To investigate the temporal relationship between PTSD symptom fluctuations and substance use/dependence.

Main Methods:

• Pilot study involving 35 outpatients in SUD treatment.
• Utilized the Longitudinal Follow-Up Evaluation and Time Line Follow-Back Interview.
• Retrospective weekly assessment of PTSD and SD symptoms, and substance use over 6 months.

Main Results:

• Weekly PTSD symptom fluctuations were concurrently associated with alcohol and cocaine dependence symptoms.
• PTSD symptom fluctuations predicted opiate dependence symptoms in the subsequent week.
• Findings support the self-medication model and highlight the utility of detailed process analysis.

Conclusions:

• PTSD symptom fluctuations are associated with substance dependence problems, not merely substance use.
• The self-medication hypothesis is supported by the observed symptom interplay.
• Longitudinal assessment provides valuable insights into comorbidity dynamics.