Depressive Symptom Profiles in Major Depressive Disorder and Bipolar Disorder: A Cross Sectional Study from Two Tertiary Care Hospitals.
Background: Differentiating major depressive disorder (MDD) from bipolar disorder (BD) remains a clinical challenge, particularly in resource limited settings. Misdiagnosis can lead to inappropriate treatment and poorer outcomes. Objective: To compare socio demographic variables, family history, and clinical features of depressive episodes in patients with MDD and BD attending tertiary care hospitals in Dr. Bidhan Chandra Roy Hospital, Haldia, West Bengal and Modern Psychiatric Hospital, Narsinghar, Agartala, Tripura. Methods: We conducted a cross-sectional study among 75 patients with MDD and 60 patients with BD. We established diagnoses using the Mini International Neuropsychiatric Interview (MINI) and the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision (DSM IV TR) criteria. We assessed sociodemographic data, family history, and stressful life events using a semi structured questionnaire and the Presumptive Stressful Life Events Scale. Severity of depression was measured using the validated Bengali version of the Beck Depression Inventory (BDI). Results: The mean age of MDD patients was 34.2 years compared to 32.6 years in BD (p = 0.28). MDD showed female predominance, while BD showed a near-equal distribution (p = 0.04). Educational attainment was significantly lower in BD compared to MDD (p = 0.01). Unemployment was higher in BD than MDD (p = 0.03). BD patients had a significantly earlier age of onset (mean 24.8 years) compared to MDD (mean 32.9 years; p = 0.001). Recurrent episodes and positive family history were more frequent in BD (p = 0.001). Stressful life events were significantly associated with MDD (p = 0.001). BD patients scored higher on the BDI (39.2 ± 9.4) than MDD patients (27.1 ± 7.8; p = 0.001), with prominent features of guilt, suicidality, irritability, social withdrawal, fatigability, and loss of libido. MDD patients exhibited more insomnia, anorexia, weight loss, and somatic preoccupation. Conclusion: BD is characterised by earlier onset, recurrent episodes, stronger familial predisposition, and greater symptom severity, while MDD is more closely linked to stressful life events and somatic complaints. Early recognition of bipolarity in depressive presentations is essential to guide appropriate treatment and improve outcomes.