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FDA Approves Ultrasound Device to Treat Tremors

July 11, 2016 By U.S. Food and Drug Administration

The U.S. Food and Drug Administration (FDA) has approved the first focused ultrasound device to treat essential tremor in patients who have not responded to medication. ExAblate Neuro uses magnetic resonance (MR) images taken during the procedure to deliver focused ultrasound to destroy brain tissue in a tiny area thought to be responsible for causing tremors.

“Patients with essential tremor who have not seen improvement with medication now have a new treatment option that could help them to avoid more invasive surgical treatments,” said Carlos Peña, Ph.D., M.S., director of the division of neurological and physical medicine devices in the FDA’s Center for Devices and Radiological Health. “As with other treatments for essential tremor, this new device is not a cure but could help patients enjoy a better quality of life.”

Essential tremor, also called benign essential tremor, is the most common form of tremor. Essential tremor may be treated with beta blockers or anticonvulsant drugs. If medications fail to control symptoms, the condition may also be treated with surgery (thalamotomy) or a deep brain stimulation device to destroy the tiny part of the brain (thalamus) that controls some involuntary movements.

Those undergoing treatment with the MRI-guided device lie in an MRI scanner that takes images to help a doctor identify the targeted area in the brain’s thalamus for treatment. Treatment with transcranial focused ultrasound energy is administered with incremental increases in energy until patients achieve a reduction of tremor. Patients are awake and responsive during the entire treatment.

Data supporting the safety and effectiveness of the device system included a double-blind control trial involving 76 patients with essential tremor who had not responded to medication therapy. Fifty-six of the patients were randomly selected to receive the ExAblate Neuro treatment and 20 received a fake treatment. Patients in the control group were able to cross over into the treatment group three months later.

Patients treated with the ExAblate Neuro showed nearly a 50 percent improvement in their tremors and motor function (composite tremor/motor function score) three months after treatment compared to their baseline score. Patients in the control group had no improvement, and some experienced a slight worsening after the sham procedure before they crossed over into the treatment group. At 12 months post-procedure, the treatment group retained a 40 percent improvement in these scores compared to baseline.

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