David A Luckenbaugh1, Mark J Niciu1, Dawn F Ionescu1, Neal M Nolan1, Erica M Richards1, Nancy E Brutsche1, Sara Guevara1, Carlos A Zarate2. 1. Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health (NIMH), National Institutes of Health (NIH), Bethesda, MD USA. 2. Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health (NIMH), National Institutes of Health (NIH), Bethesda, MD USA. Electronic address: zaratec@mail.nih.gov.
Abstract
BACKGROUND: The N-methyl-d-aspartate receptor antagonist ketamine has rapid antidepressant effects in major depression. Psychotomimetic symptoms, dissociation and hemodynamic changes are known side effects of ketamine, but it is unclear if these side effects relate to its antidepressant efficacy. METHODS: Data from 108 treatment-resistant inpatients meeting criteria for major depressive disorder and bipolar disorder who received a single subanesthetic ketamine infusion were analyzed. Pearson correlations were performed to examine potential associations between rapid changes in dissociation and psychotomimesis with the Clinician-Administered Dissociative States Scale (CADSS) and Brief Psychiatric Rating Scale (BPRS), respectively, manic symptoms with Young Mania Rating Scale (YMRS), and vital sign changes, with percent change in the 17-item Hamilton Depression Rating scale (HDRS) at 40 and 230min and Days 1 and 7. RESULTS: Pearson correlations showed significant association between increased CADSS score at 40min and percent improvement with ketamine in HDRS at 230min (r=-0.35, p=0.007) and Day 7 (r=-0.41, p=0.01). Changes in YMRS or BPRS Positive Symptom score at 40min were not significantly correlated with percent HDRS improvement at any time point with ketamine. Changes in systolic blood pressure, diastolic blood pressure, and pulse were also not significantly related to HDRS change. LIMITATIONS: Secondary data analysis, combined diagnostic groups, potential unblinding. CONCLUSIONS: Among the examined mediators of ketamine׳s antidepressant response, only dissociative side effects predicted a more robust and sustained antidepressant. Prospective, mechanistic investigations are critically needed to understand why intra-infusion dissociation correlates with a more robust antidepressant efficacy of ketamine. Published by Elsevier B.V.
BACKGROUND: The N-methyl-d-aspartate receptor antagonist ketamine has rapid antidepressant effects in major depression. Psychotomimetic symptoms, dissociation and hemodynamic changes are known side effects of ketamine, but it is unclear if these side effects relate to its antidepressant efficacy. METHODS: Data from 108 treatment-resistant inpatients meeting criteria for major depressive disorder and bipolar disorder who received a single subanesthetic ketamine infusion were analyzed. Pearson correlations were performed to examine potential associations between rapid changes in dissociation and psychotomimesis with the Clinician-Administered Dissociative States Scale (CADSS) and Brief Psychiatric Rating Scale (BPRS), respectively, manic symptoms with Young Mania Rating Scale (YMRS), and vital sign changes, with percent change in the 17-item Hamilton Depression Rating scale (HDRS) at 40 and 230min and Days 1 and 7. RESULTS: Pearson correlations showed significant association between increased CADSS score at 40min and percent improvement with ketamine in HDRS at 230min (r=-0.35, p=0.007) and Day 7 (r=-0.41, p=0.01). Changes in YMRS or BPRS Positive Symptom score at 40min were not significantly correlated with percent HDRS improvement at any time point with ketamine. Changes in systolic blood pressure, diastolic blood pressure, and pulse were also not significantly related to HDRS change. LIMITATIONS: Secondary data analysis, combined diagnostic groups, potential unblinding. CONCLUSIONS: Among the examined mediators of ketamine׳s antidepressant response, only dissociative side effects predicted a more robust and sustained antidepressant. Prospective, mechanistic investigations are critically needed to understand why intra-infusion dissociation correlates with a more robust antidepressant efficacy of ketamine. Published by Elsevier B.V.
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