Treatment-resistant depression (TRD) is prevalent and associated with a substantial psychosocial burden and mortality. There are few prior studies of interventions for TRD in adolescents. This was the largest study to date examining the feasibility, safety, and efficacy of 10-Hz transcranial magnetic stimulation (TMS) for adolescents with TRD. Adolescents with TRD (aged 12-21 years) were enrolled in a randomized, sham-controlled trial of TMS across 13 sites. Treatment resistance was defined as an antidepressant treatment record level of 1 to 4 in a current episode of depression. Intention-to-treat patients (n = 103) included those randomly assigned to active NeuroStar TMS monotherapy (n = 48) or sham TMS (n = 55) for 30 daily treatments over 6 weeks. The primary outcome measure was change in the Hamilton Depression Rating Scale (HAM-D-24) score. After 6 weeks of blinded treatment, improvement in the least-squares mean (SE) HAM-D-24 scores were similar between the active (−11.1 [2.03]) and sham groups (−10.6 [2.00]; P = 0.8; difference [95% CI], − 0.5 [−4.2 to 3.3]). Response rates were 41.7% in the active group and 36.4% in the sham group (P = 0.6). Remission rates were 29.2% in the active group and 29.0% in the sham group (P = 0.95). There were no new tolerability or safety signals in adolescents. Although TMS treatment produced a clinically meaningful change in depressive symptom severity, this did not differ from sham treatment. Future studies should focus on strategies to reduce the placebo response and examine the optimal dosing of TMS for adolescents with TRD.

Background: Transcranial magnetic stimulation (TMS) has demonstrated efficacy in the treatment of major depressive disorder; however, prior studies have provided only partial safety information. We examined the acute efficacy of TMS in a randomized sham-controlled trial, under openlabel conditions, and its durability of benefit. Method: Aggregate safety data were obtained from a comprehensive clinical development program examining the use of TMS in the treatment of major depressive disorder. There were 3 separate clinical protocols, including 325 patients from 23 clinical sites in the United States, Australia, and Canada. Active enrollment occurred between January 2004 and August 2005. Adverse events were assessed at each study visit by review of spontaneous reports with separate reporting of serious adverse events. Safety assessments were also completed for cognitive function and auditory threshold. Assessment of disease-specific risk included the potential for worsening of depressive symptoms. Finally, the time course and accommodation to the most commonly appearing adverse events were considered. Results: TMS was administered in over 10,000 cumulative treatment sessions in the study program. There were no deaths or seizures. Most adverse events were mild to moderate in intensity. Transient headaches and scalp discomfort were the most common adverse events. Auditory threshold and cognitive function did not change. There was a low discontinuation rate (4.5%) due to adverse events during acute treatment. Conclusions: TMS was associated with a low incidence of adverse events that were mild to moderate in intensity and demonstrated a largely predictable time course of resolution. TMS may offer clinicians a novel, well-tolerated alternative for the treatment of major depressive disorder that can be safely administered in an outpatient setting.

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Abstract:Objective: NeuroStar® Advanced Therapy System is a transcranial magnetic stimulation (TMS) device with FDA-clearance for the treatment of Major Depressive Disorder (MDD) in adult patients who have failed to receive satisfactory improvement from prior antidepressant medication in the current episode. With TMS, magnetic pulses are transmitted into the brain. Though the exact mechanism of action is unknown, it is postulated that resulting neuronal depolarization and changes in brain functional activity may be associated with various physiologic changes that lead to relief of depression in the indicated population. The type of magnetic field generated with TMS is not intended to induce a seizure during therapeutic use, but unintentional seizures have been reported during TMS treatment.No seizures were reported with the use of the NeuroStar® system in clinical trials conducted prior to FDA clearance. The estimated risk of seizure in the NeuroStar® label is approximately 1 in 30,000 treatments or 1 in 1,000 patients. Since introduction of the NeuroStar® system into clinical practice, the rate at which seizures have been reported is even lower.Methods:We conducted a review of literature that named the NeuroStar® Advanced Therapy System as the device used for TMS treatment and reviewed all seizure events reported to Neuronetics, Inc., directly or through FDA MedWatch through June 30, 2019. Articles reporting seizures in subjects with epilepsy during TMS treatment were excluded.Results:Previous comprehensive reviews of seizures induced by treatment with any TMS device by Wasserman et al. (1998) and Rossi et al. (2009) revealed that the rate of seizures is low. Many subjects that developed seizures during TMS had either received stimulation at parameters beyond current recommendations or had been predisposed to develop seizures in some way. Some of the events reported as seizures may, in fact, have been non-epileptic events.Our literature review and analysis of seizures reported to Neuronetics, Inc. revealed that the rate of seizures during TMS treatment with the NeuroStar® appears to be lower than the rate that is published in the NeuroStar® Advanced Therapy prescribing information.Conclusions:Seizures that take place during TMS treatment with the NeuroStar® system are rare. The rate of seizures reported directly to Neuronetics, Inc. is lower than that included in the NeuroStar® prescribing information. Our literature review validated seizures during TMS treatment with the NeuroStar® system reported in published literature have described either non-epileptic events (syncope) or occurred with risk factors for seizure induction, such as other predisposing clinical factors or treatment parameters outside the guideline recommend “safe” ranges.Funding Acknowledgements:Neuronetics, Inc.