Prior psychiatric morbidity and differential psychopharmacological treatment patterns: Exploring the heterogeneity of...

Area of Science:

• Psychiatry
• Clinical Psychology
• Pharmacology

Background:

• Bipolar disorder (BD) presents with diverse pre-diagnosis illness trajectories.
• Pre-onset illness patterns may predict treatment response in BD.
• Understanding these patterns is crucial for personalized medicine in BD.

Purpose of the Study:

• To investigate the association between psychiatric conditions preceding a BD diagnosis and subsequent pharmacological treatment patterns.
• To identify if pre-diagnosis comorbidities influence the choice of medications within two years post-diagnosis.

Main Methods:

• A register-based study of 9594 patients diagnosed with BD in Danish Psychiatric Services (2012-2016).
• Examined associations between prior diagnoses (substance use disorder, psychosis, depression, anxiety, PTSD, personality disorder, ADHD) and BD medication use (lithium, valproate, lamotrigine, antidepressants, olanzapine, risperidone, quetiapine).
• Utilized multivariable Cox proportional hazards regression, adjusted for age, sex, and BD diagnosis year.

Main Results:

• Antidepressants, quetiapine, and lamotrigine were frequently used, particularly in female patients with prior depressive illness.
• Lithium was prescribed to patients with less preceding diagnostic complexity.
• Valproate was more commonly used in patients with prior substance use disorder or ADHD.

Conclusions:

• Pharmacological treatment for bipolar disorder is demonstrably linked to preceding psychiatric conditions.
• These findings suggest that prior morbidity should be considered in treatment allocation for BD.
• This knowledge can inform the design of future clinical trials for bipolar disorder treatments.