Symptom Overlap Between Depression and Borderline Personality Disorder: A Network Analysis
Summary & key facts
Researchers combined symptom data from about 550 people with major depression to look at how depression symptoms and borderline personality disorder symptoms link together. They used a method that maps symptoms like a web to see which ones connect the two conditions. The strongest links were that identity problems and unstable relationships (both BPD symptoms) were closely tied to suicidal thoughts and actions in people with depression. People with identity problems were almost three times more likely to have tried to kill themselves before. Because the study looked at one point in time, it cannot show cause and effect. The findings suggest these particular BPD symptoms deserve attention whe
- The study pooled baseline data from four clinical trials and included about 550 people who had current major depression.
- Researchers used a symptom-network method, which treats symptoms as connected points in a web, to see which symptoms bridge depression and borderline personality disorder.
- Two BPD symptoms—identity disturbance (trouble knowing who you are) and unstable relationships—were strongly connected to suicidal thoughts and behaviours in people with depression.
- After taking overall depression severity into account, the links between identity problems and suicidal thoughts/actions stayed strong, meaning these links were not just because someone was more depressed overall.
- People who showed identity disturbance were almost three times more likely to report a previous suicide attempt than those without that symptom.
- Because the analysis used data from one time point, it cannot prove that these BPD symptoms cause suicidal thoughts or attempts.
Abstract
Major depression (MD) is a serious mental health disorder projected to become the leading cause of global disability by 2030. Borderline personality disorder (BPD) frequently co-occurs with MD. Individuals with both conditions often experience prolonged recovery times and exhibit high levels of suicidal behaviour. Network theory and its application, network analysis, presents a novel framework for conceptualising and understanding the comorbidity between MD and BPD. This network analysis aims to identify influential symptoms within a BPD/MD network and explore the clinical relevance of these relationships. Data from 548 participants were pooled from four clinical trials run between 1994 and 2013 at the Department of Psychological Medicine, University of Otago, Christchurch, New Zealand. All participants were diagnosed with current MD (as part of major depressive disorder or bipolar II disorder). Baseline MD and BPD symptom data from trial entry assessments were entered into a cross-sectional network analysis. A further network analysis was estimated with the addition of three covariates (age, gender and depression severity) alongside the MD and BPD symptoms. Network analyses identified several connecting symptoms between MD and BPD. After controlling for depression severity, BPD symptoms of identity disturbance and unstable relationships had unique and robust relationships with MD suicidal ideation and behaviours. Further exploration of these bridge relationships found that participants who exhibited identity disturbance were almost three times more likely to have reported a previous suicide attempt. Results from this study have implications for risk assessment and treatment of individuals with comorbid MD and BPD.
