Evaluating real-world effectiveness of accelerated transcranial magnetic stimulation for treatment-resistant depression in a tertiary referral center based in Quebec, Canada

Objective: To assess the effectiveness of accelerated transcranial magnetic stimulation (TMS) for treatmentresistant depression (TRD) in a tertiary referral center in Quebec, Canada, focusing on a real-world clinical setting. Methods: We reviewed the data of 247 TRD patients treated between January 2012 and May 2022 who received accelerated TMS. Participants were adults diagnosed with unipolar or bipolar depression, resistant to at least two antidepressant trials, and assessed using the Montgomery-angstrom sberg Depression Rating Scale (MADRS). Results: Significant symptom reduction was found in the completer sample (N = 147), with 46.3 % of patients meeting post-treatment response criteria and 36.1 % achieving remission. Baseline severity of depression, age, and the number of antidepressant trials were key predictors of treatment outcomes. Patients who did not complete treatment had generally more severe depressive and anxious symptoms and greater treatment resistance. No significant differences in response rates were observed across different TMS coils. Conclusion: The study demonstrated the effectiveness and tolerability of accelerated TMS for TRD in a real-world clinical setting.