New Treatment Successful for Rare and Disabling Movement Disorder, the Mal de Debarquement Syndrome (MdDS)
People who suffer from a rare illness, the Mal de Debarquement Syndrome (MdDS), now have a chance for full recovery thanks to treatment developed by researchers at the Icahn School of Medicine at Mount Sinai. Their findings were published online in the July issue of Frontiers in Neurology.
People often feel a sensation of movement, called Mal de Debarquement, after they have finished boating, surfing or a sea voyage. The symptoms usually disappear within hours, but in some people, and more frequently in women, symptoms can continue for months or years, causing fatigue, insomnia, headaches, poor coordination, anxiety, depression and an inability to work. Known as the Mal de Debarquement Syndrome (MdDS), the rare condition is marked by continuous feelings of swaying, rocking or bobbing.
“Our study has provided the first effective treatment for this troublesome disorder, and we hope it provides relief to the thousands of people who may be affected worldwide,” said Bernard Cohen, MD, the Morris Bender Professor of Neurology at the Icahn School of Medicine at Mount Sinai.
Until now, there has been no effective treatment for MdDS. Diagnostic tests and early research done at Mount Sinai suggested that MdDS was caused by malfunctioning of the vestibule-ocular reflex (VOR), a mechanism in the inner ear that maintains balance and stabilizes the eyes during head movements, said Dr. Cohen.
The new treatment re-adapts the VOR by moving the visual surroundings as the head is slowly rolled from side to side at the same frequency as the subject’s symptomatic rocking, swaying or bobbing. In the study, the head roll caused vertical eye movements (nystagmus), and subjects tended to turn to one side when marching in place.
Subjects were rocked or swayed at about one cycle per five seconds. Generally, three to five treatments a day for one week were sufficient to produce a cure, and the movements and associated symptoms disappeared. Side effects of the treatments were negligible. Seventy percent of the 24 subjects that were treated in this study (21 women, three men, mean age 43.3 years) reported either a complete or substantial recovery for a mean follow-up of approximately one year after treatment. Six only had transient improvement, while one did not respond to treatment.
“The work of our team also opens up a new area of research on how the Vestibulo-Ocular Reflex can produce head and body oscillations, and may eventually provide insight into other brain diseases that cause repetitive shaking and tremor of the head and body,” Dr. Cohen said.
Mal de Debarquement Syndrome (MdDS) occurs only in a small fraction of those who experience Mal de Debarquement, and has been classified as a rare, disabling disease by the National Institutes of Health (NIH). Exact estimates of its prevalence are not available, but it was present in 1.3 percent of patients at a ‘Neuro Otology Clinic’ at the University of California, Los Angeles (UCLA). This suggests that there are hundreds of people with this syndrome in the United States and thousands worldwide, Dr. Cohen said.
Mingjia Dai, PhD, Assistant Professor of Neurology, worked closely with Dr. Cohen to develop the treatment, treated the subjects and led the group at the Icahn School of Medicine at Mount Sinai. Co-collaborators included Catherine Cho, MD, MSCR, Assistant Professor of Neurology in the Eye Movement and Vertigo Program, and Eric Smouha, MD, Associate Professor of Otolaryngology and Director of Otology-Neurotology.
The study was supported by a grant from the National Institute on Deafness and Other Communication Disorders (NIDCD), (Grant #R21, DC012162), to Dr. Dai.
About the Mount Sinai Health System
The Mount Sinai Health System is New York City's largest academic medical system, encompassing eight hospitals, a leading medical school, and a vast network of ambulatory practices throughout the greater New York region. Mount Sinai is a national and international source of unrivaled education, translational research and discovery, and collaborative clinical leadership ensuring that we deliver the highest quality care—from prevention to treatment of the most serious and complex human diseases. The Health System includes more than 7,200 physicians and features a robust and continually expanding network of multispecialty services, including more than 400 ambulatory practice locations throughout the five boroughs of New York City, Westchester, and Long Island. The Mount Sinai Hospital is ranked No. 14 on U.S. News & World Report's "Honor Roll" of the Top 20 Best Hospitals in the country and the Icahn School of Medicine as one of the Top 20 Best Medical Schools in country. Mount Sinai Health System hospitals are consistently ranked regionally by specialty and our physicians in the top 1% of all physicians nationally by U.S. News & World Report.