Self-report screening instruments differentiate bipolar disorder and borderline personality disorder

Area of Science:

• Psychiatry
• Clinical Psychology
• Diagnostic Accuracy

Background:

• Bipolar disorder (BD) and borderline personality disorder (BPD) share overlapping symptoms, leading to frequent misdiagnosis.
• Accurate differentiation is crucial for effective treatment planning.

Purpose of the Study:

• To evaluate the diagnostic accuracy of the Mood Disorder Questionnaire (MDQ) and McLean Screening Instrument for Borderline Personality Disorder (MSI).
• To identify individual screening items that can differentiate BD from BPD in an inpatient setting.

Main Methods:

• 757 inpatients completed the MDQ and MSI.
• Clinical discharge diagnoses served as the reference standard.
• Analysis of individual screening items for predictive value.

Main Results:

• Both MDQ and MSI showed higher specificity than sensitivity.
• MDQ items like elevated mood and grandiosity predicted BD but not BPD.
• MSI items like self-harm behaviors and distrust predicted BPD but not BD.

Conclusions:

• Specific screening items can help differentiate BD from BPD.
• Further research with larger datasets and advanced methodologies is recommended for enhanced diagnostic precision.