Landmark Lancet Study Confirms Magnetic Seizure Therapy Matches ECT Efficacy With Fewer Memory Risks

A landmark Lancet study led by CAMH reveals Magnetic Seizure Therapy is as effective as ECT for severe depression but with 85% fewer memory side effects.

By: AXL Media

Published: Apr 18, 2026, 4:50 AM EDT

Source: Information for this report was sourced from Centre for Addiction and Mental Health

A New Benchmark for Treatment Resistant Depression

For decades, electroconvulsive therapy (ECT) has been regarded as the most effective intervention for patients with major depressive disorder who do not respond to traditional medications or psychotherapy. However, its use has been perpetually limited by its tendency to cause post-treatment confusion and long-term memory loss. A landmark randomized clinical trial published in The Lancet Psychiatry on April 16, 2026, has finally identified a comparable alternative. Led by Dr. Daniel Blumberger of the Centre for Addiction and Mental Health (CAMH) and Dr. Zafiris Daskalakis of UC San Diego, the CREST-MST study provides the first large-scale evidence that Magnetic Seizure Therapy (MST) can deliver life-saving antidepressant effects without the heavy cognitive cost traditionally associated with convulsive therapies.

Comparing Clinical Response and Remission Rates

The double-blind, non-inferiority trial enrolled nearly 300 participants across three major academic centers in Canada and the United States between 2018 and 2024. The results demonstrated that 48 percent of patients in both the MST and ECT groups experienced a meaningful clinical response. Additionally, the study achieved its primary non-inferiority goal regarding remission rates, which were 22.5 percent for MST and 27.8 percent for ECT. These findings suggest that magnetic pulses can trigger the same therapeutic neuroplastic changes as electrical currents, providing a robust second option for the estimated one-third of depression patients who are pharmacologically resistant to standard care.

Focal Brain Activation Spires Memory Centers

The fundamental difference between the two treatments lies in their physical delivery. While ECT applies a diffuse electrical discharge that spreads to deep brain structures like the hippocampus—the brain's memory hub—MST utilizes high-intensity magnetic pulses to induce a more targeted seizure. Because the skull does not resist magnetic fields, the stimulation can be focused to avoid the temporal lobes linked with memory. This precision was reflected in the study's safety data: clinically meaningful worsening of memory affected only 2.7 percent of MST participants, a stark contrast to the 17.3 percent seen in the ECT group. Patients receiving MST also reoriented significantly faster after treatment, reducing th...