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  • Title: Irritability and Its Clinical Utility in Major Depressive Disorder: Prediction of Individual-Level Acute-Phase Outcomes Using Early Changes in Irritability and Depression Severity.
    Author: Jha MK, Minhajuddin A, South C, Rush AJ, Trivedi MH.
    Journal: Am J Psychiatry; 2019 May 01; 176(5):358-366. PubMed ID: 30922100.
    Abstract:
    OBJECTIVE: The authors evaluated improvement in irritability with antidepressant treatment and its prognostic utility in treatment-seeking adult outpatients with major depressive disorder. METHODS: Mixed-model analyses were used to assess changes in irritability (as measured with the five-item irritability domain of the Concise Associated Symptom Tracking [CAST-IRR] scale) from baseline to week 4 after controlling for depression severity (as measured with the 16-item Quick Inventory of Depressive Symptomatology-Clinician Rated [QIDS-C]) in the Combining Medications to Enhance Depression Outcomes (CO-MED) trial (N=664). An interactive calculator for remission (QIDS-C score ≤5) and no meaningful benefit (<30% reduction in QIDS-C score from baseline) at week 8 was developed with logistic regression analyses in the CO-MED trial using participants with complete data (N=431) and independently replicated in the Suicide Assessment and Methodology Study (SAMS) (N=163). RESULTS: In the CO-MED trial, irritability was significantly reduced (effect size=1.06) from baseline to week 4, and this reduction remained significant after adjusting for QIDS-C change (adjusted effect size=0.36). A one-standard-deviation greater reduction in CAST-IRR score from baseline to week 4 predicted a 1.73 times higher likelihood of remission and a 0.72 times lower likelihood of no meaningful benefit at week 8, independent of baseline QIDS-C and CAST-IRR scores and reduction in QIDS-C score from baseline to week 4. The model estimates for remission (area under the curve [AUC]=0.79) and no meaningful benefit (AUC=0.76) in the CO-MED trial were used to predict remission (AUC=0.80) and no meaningful benefit (AUC=0.84) in SAMS and to develop an interactive calculator. CONCLUSIONS: Irritability is an important symptom domain of major depressive disorder that is not fully reflected in depressive symptom severity measures. Early reductions in irritability, when combined with changes in depressive symptom severity, provide a robust estimate of likelihood of remission or no meaningful benefit in outpatients with major depression.
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