Affective comorbidity in panic disorder: is there a bipolar connection?

Area of Science:

• Psychiatry
• Clinical Psychology
• Behavioral Science

Background:

• Comorbidity in panic disorder (PD) is theoretically explained but clinically complex.
• Co-occurrence of panic, obsessive-compulsive, and 'soft' bipolar conditions in PD patients is under-explored.

Purpose of the Study:

• To systematically investigate the intra-episodic and longitudinal comorbidity spectrum in a cohort of panic disorder patients.
• To examine the relationship between panic disorder and anxiety disorders, major depression, and soft bipolar spectrum disorders.

Main Methods:

• A 2-year prospective study of 140 patients diagnosed with DSM-III-R panic disorder.
• Patients were consecutively admitted to an ambulatory psychiatric service.
• Comorbidity was assessed using established diagnostic criteria, including DSM-III-R for panic disorder and agoraphobia.

Main Results:

• Comorbidity with strictly defined anxiety disorders was uncommon (e.g., OCD 4.2%).
• Comorbidity with melancholic Major Depression occurred in 22.9% of PD patients.
• Significant comorbidity was found with soft bipolar spectrum disorders: mania (2.1%), hypomania (5%), cyclothymia (6.4%), and hyperthymic temperament (34.3%).

Conclusions:

• Panic disorder comorbidity extends beyond anxiety and depressive disorders to include soft bipolar spectrum conditions.
• These comorbid patterns may contribute to complex clinical presentations like 'atypical depression' and 'borderline personality'.
• Further research is needed to validate the link between panic disorder and soft bipolar disorders and rule out referral bias.