Treatment-Resistant Depression: Could VNS Still Offer Benefit After Multiple Failed Treatments?
In the 12-month RECOVER trial, 493 adults with highly treatment-resistant major depressive disorder were randomized to active vagus nerve stimulation (VNS) plus treatment as usual or sham VNS plus treatment as usual. Participants had failed an average of about 13 lifetime antidepressant treatments and had longstanding, severe illness. Active VNS did not significantly outperform sham on the primary endpoint-percent time in Montgomery-Åsberg Depression Rating Scale (MADRS) response (18.9% vs 16.3%; P = 0.137). However, several secondary measures favored active VNS, including greater time in response on the patient-rated Quick Inventory of Depressive Symptomatology - Self-Report (QIDS-SR) and clinician-rated Clinical Global Impressions (CGI-I) and greater time in partial response on the Quick Inventory of Depressive Symptomatology - Clinician Rated (QIDS-C) and CGI-I.
For patients with marked treatment-resistant depression, the findings highlight both the potential and the limitations of VNS in a population with few remaining treatment options. Benefits were modest and varied depending on the outcome measure, while remission rates were low and did not differ significantly between groups on MADRS, QIDS-C, or QIDS-SR. The device was generally well tolerated, with no new safety signals identified, although dysphonia, dyspnea, implant-site pain, worsening depression, and suicidal ideation were among reported adverse events. The authors note that the extreme degree of treatment resistance, fixed stimulation parameters after early titration, and limitations of the sham design may have influenced the results. This underscores the need for longer-term follow-up and additional analyses.
Reference: Conway CR, Aaronson ST, Sackeim HA, et al. Vagus nerve stimulation in treatment-resistant depression: A one-year, randomized, sham-controlled trial. Brain Stimul. 2025 May-Jun;18(3):676-689. doi: 10.1016/j.brs.2024.12.1191. PMID: 39706521.
Delaney Fragale
PA-C, Psych-CAQ