Department of Psychiatry
Mental Disorders | Psychiatry | Therapeutics
Objective: To compare the durations of response achieved with adjunctive vagus nerve stimulation (VNS + TAU) vs treatment as usual (TAU) alone in treatment-resistant depression (TRD) over a 5-year period in the TRD registry.
Materials and methods: Data from 271 participants on TAU and 328 participants on VNS + TAU were analyzed. Response was defined as > /=50% decrease in baseline Montgomery-Asberg Depression Rating Scale (MADRS) score at postbaseline visit and was considered retained until the decrease was < 40%. MADRS was obtained quarterly in year 1 and biannually thereafter. Time-to-events were estimated using Kaplan-Meier method and compared using log-rank test. HR was estimated using Cox proportion hazard model.
Results: In the VNS + TAU arm, 62.5% (205/328) of participants had a first response over 5 years compared with 39.9% (108/271) in TAU. The time to first response was significantly shorter for VNS + TAU than for TAU (P < 0.01). For responders in the first year, median time to relapse from first response was 10.1 months (Q1=4.2, Q3=31.5) for VNS + TAU vs 7.3 months (Q1=3.1, Q3=17.6) for TAU (P < 0.01). HR=0.6 (95% CI: 0.4, 0.9) revealed a significantly lower chance for relapse in VNS + TAU. Probability of retaining first response for a year was 0.39 (0.27, 0.51) for TAU and 0.47 (0.38, 0.56) for VNS + TAU. Timing of the onset of the response did not impact the durability of the response.
Conclusion: VNS therapy added to TAU in severe TRD leads to rapid onset and higher likelihood of response, and a greater durability of the response as compared to TAU alone.
depressive disorder, durability of response, longitudinal study, treatment-resistant depression, vagus nerve stimulation
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DOI of Published Version
Neuropsychiatr Dis Treat. 2019 Feb 13;15:457-468. doi: 10.2147/NDT.S196665. eCollection 2019. Link to article on publisher's site
Neuropsychiatric disease and treatment
Kumar A, Bunker MT, Aaronson ST, Conway CR, Rothschild AJ, Mordenti G, Rush AJ. (2019). Durability of symptomatic responses obtained with adjunctive vagus nerve stimulation in treatment-resistant depression. Open Access Publications by UMass Chan Authors. https://doi.org/10.2147/NDT.S196665. Retrieved from https://escholarship.umassmed.edu/oapubs/3759
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 License