MGH McLean Adult Psychiatry Residency Program

Michael Rohan, a physicist at McLean Hospital’s Brain Imaging Center, demonstrated the low-field magnetic stimulation (LFMS) device he developed.

Individuals with major depressive disorder or bipolar disorder who receive low-field magnetic stimulation (LFMS) show immediate and substantial mood improvement, McLean Hospital researchers report in the Aug. 1 issue of Biological Psychiatry.

“LFMS is unlike any current treatment. It uses magnetic fields that are a fraction of the strength but at a higher frequency than the electromagnetic fields used in TMS [transcranial magnetic stimulation] and ECT [electroconvulsive therapy],” explained first author Harvard Medical School.

According to Rohan, although other brain stimulation treatments like ECT and TMS are often effective for the treatment of depression, they typically take longer to impact mood, and ECT is associated with side effects such as memory loss. Similarly, while antidepressant medications can be highly effective for treating depression, it can take between four to six weeks before mood changes are detected.

“Importantly, LFMS appears to have an immediate effect on mood and thus has the potential to provide relief in emergency situations,” explained Rohan, who first reported the potential use of LFMS to treat depression in a groundbreaking study in 2004. “In addition to providing quick relief from symptoms, the other exciting piece about LFMS is that no side effects have been observed.”

Joan Camprodon, MD, MPH, PhD (Class of 2012), demonstrates the use of TMS on Amanda Arulpragasam, MGH Research Assistant

For patients suffering from depression, the Massachusetts General Hospital Department of Psychiatry now offers another treatment option – a new clinic based in Charlestown that uses transcranial magnetic stimulation (TMS). The clinic is part of a broader effort that includes a research enterprise program, both led by Joan Camprodon, MD, MPH, PhD, (Class of 2012) director of the Laboratory for Neuropsychiatry and Neuromodulation at Mass General. Dr. Camprodon’s team aims to understand how the brain’s structure and function affect disease and how interventions such as TMS can change the mechanisms that contribute to disease.

During a TMS procedure, focused magnetic impulses are directed to the brain. The electrical currents produced stimulate nerve cells involved in mood regulation that may be underactive in diseases such as depression. By restoring the equilibrium, TMS helps reset this imbalance of chemicals. from a diseased brain to a healthy one.