Clinical burden of major depressive disorder with versus without prominent anhedonia using a real-world electronic health records and claims linked database.

backgroundAnhedonia is a core feature of major depressive disorder (MDD), yet the clinical burden in real-world settings is not well understood. This retrospective cohort study assessed depression symptoms and treatment patterns among patients with MDD with and without prominent anhedonia.

methodsPatients with MDD were selected from a real-world dataset of electronic health records from mental health specialists and linked medical and pharmacy claims (OM1, Inc. Boston MA) between January 2013 through August 2023. Patients were included if the first Patient Health Questionnaire 9-item (PHQ-9) score indicated moderate to severe depression (≥ 10) with a MDD diagnosis +/-30 days. The date of the patients’ first PHQ-9 score was used as the index date. Patients with a score ≥ 2 on PHQ-9 item 1 (anhedonia) at the index date were classified as MDD with prominent anhedonia (MDD-ANH) (n = 4,255). The remaining patients were classified as Other-MDD (n = 1,454). Treatment patterns were assessed using prescription records in the year following the index date. The last PHQ-9 score in the year following the index date was used to assess remission rates (PHQ-9 score < 5) or persistence of moderate to severe depression.

resultsA total of 5,709 patients with MDD were assessed; 74.5% were in MDD-ANH and 25.5% were in the Other-MDD cohort (met criteria for MDD but not prominent anhedonia). The mean index PHQ-9 score was 18.2 (SD = 4.2) for MDD-ANH patients and 13.5 (SD = 2.9) for Other-MDD patients. The percentage of patients treated with antidepressants was 86.4% in the MDD-ANH group and 84.7% in the Other-MDD group. After adjusting for baseline characteristics, patients with MDD-ANH were more likely to have been treated with atypical antipsychotics (OR = 1.51, p < 0.001), more likely to have switched medication (OR = 1.24, p = 0.004), and more likely to have augmented antidepressant therapy (OR = 1.16, p = 0.021) than Other-MDD patients. Patients with MDD-ANH were less likely to have achieved remission (OR = 0.82, p = 0.003) and were more likely to have persistent depression (OR = 1.50, p < 0.001) than patients with Other-MDD.

conclusionsOverall, MDD-ANH patients had higher clinical burden reflected in more depressive symptoms, higher treatment utilization and lower rates of remission compared to Other-MDD.