Symptomatic and Therapeutic Significance of Generalized Anxiety Disorder Comorbidity in Patients with Obsessive-Compulsive Disorder

Background: Psychiatric disorders frequently accompany comorbid conditions, which can have negative prognostic effects. The etiological and phenomenological distinctions between these conditions may have significant implications for their therapeutic approach and clinical course. Objectives: Our study aimed to investigate the symptomatic and therapeutic significance of comorbid generalized anxiety disorder (GAD) on obsessive-compulsive disorder (OCD). Methods: This cross-sectional study included OCD patients referred to private and institutional psychiatric clinics in Rasht, Guilan, in 2021. All participants were divided into two groups: those with OCD and those with both OCD and GAD (OCD-GAD). The diagnoses were determined using structured clinical interviews that followed the DSM-5-research version (DSM-5-RV) criteria and included psychiatric histories. Patients were assessed using the Hamilton anxiety rating (HAM) scale, Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), and Global Assessment of Functioning (GAF). The data were analyzed using SPSS version 20. Results: Out of the 146 participants, 80 had only OCD, while 66 had both OCD and GAD. Both groups demonstrated significant improvements in GAF scores throughout the treatment period (P < 0.0001); however, there was no significant difference between the groups in terms of these improvements. The Y-BOCS score was significantly higher in the OCD group at baseline (P < 0.0001), and it decreased more during the first 3 months in the OCD-GAD group (P = 0.006). The severity of obsessive-compulsive symptoms related to symmetry (P = 0.014), hoarding (P = 0.034), taboo thoughts (P = 0.023), and aggression (P = 0.002) was significantly higher in the group with OCD. Both HAM-A and Y-BOCS scores decreased over time, but HAM-A showed a greater decline at the first follow-up, while Y-BOCS showed a greater decline at the second follow-up. Conclusions: Considering our findings, OCD-GAD diagnosis is not a unique subcategory of current psychiatric disorders, and it is not necessarily beneficial to regard it as such. However, we found that the comorbidity of GAD did not harm the prognosis of patients with OCD. Further investigations are recommended to evaluate the clinical significance of OCD-GAD comorbidity.