Investigating PTSD, mental disorders, and suicide through self-comparison: a self-controlled case series study over...

Area of Science:

• Psychiatry
• Epidemiology
• Mental Health Research

Background:

• Posttraumatic stress disorder (PTSD) significantly affects mental health and society.
• Understanding the temporal dynamics between PTSD and comorbid conditions is crucial but limited.
• Existing research lacks detailed analysis of longitudinal relationships and risk periods.

Purpose of the Study:

• To explore the longitudinal relationships between PTSD and comorbid mental disorders.
• To investigate the temporal links between PTSD, suicide deaths, and all-cause mortality.
• To identify specific risk periods and temporal sequences in the development of comorbid conditions.

Main Methods:

• A self-controlled case series design was employed using the Taiwan National Health Insurance Research Database.
• Adults with incident PTSD diagnosis from 2000-2012 were followed until 2018 or death.
• Risk periods included the year of and five years preceding/following PTSD diagnosis, compared to self-controlled periods.

Main Results:

• Reciprocal relationships were found between PTSD and various mental disorders, particularly within the year preceding or of diagnosis.
• Major depressive disorder emerged as a significant predictor of PTSD.
• An increased risk of suicide deaths was observed 3-5 years post-PTSD, but no association with all-cause mortality within 5 years.

Conclusions:

• Complex, bidirectional relationships exist between PTSD and comorbid mental disorders.
• Integrated treatment and targeted prevention strategies are essential, especially focusing on the first year post-diagnosis.
• Findings offer insights into psychiatric nosology, diagnosis, treatment, and prevention of mental health disorders.