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Monday, June 26, 2017

Insomnia Medication May Wake Some Patients From Vegetative State

NEUROSCIENCE NEWS    JUNE 26, 2017

Summary: Zolpidem, a medication commonly prescribed for insomnia, appear to be effective in helping to restore a conscious state in some patients who were in comas or vegetative state.


Source: University of Michigan.

University of Michigan is now available as an Alexa flash news briefing skill. NeuroscienceNews.com image is credited to Michigan Medicine.


In a new systematic review in JAMA Neurology, Michigan Medicine researchers found reason to further explore the surprising effects of zolpidem that have been observed outside the scope of its primary Food and Drug Administration approval.

“We saw a dramatic effect in a small amount of patients with a variety of conditions,” says Martin “Nick” Bomalaski, M.D., an outgoing resident physician in the Department of Physical Medicine & Rehabilitation. For one of the first systematic reviews of this unique effect, he spent two years combing through all the case studies and small trials that have been published.

Most of the patients who responded to zolpidem for noninsomnia neurological disorders had either a disorder of consciousness or a movement disorder, Bomalaski reports. That includes those in comas and vegetative states, and others with Parkinson’s disease and dystonia. In addition, some other patients who had experienced a stroke or traumatic brain injury, or patients with dementia, were prescribed for a range of symptoms, including aphasia, apathy and motor coordination. In all, more than 20 neurological disorders were part of the review.

Significant but transient effects

For most patients who saw improvement after taking zolpidem, the effects tended to last one to four hours but were repeatable. Depending on the condition, progress was reported for coma recovery, dystonia, Parkinson’s disease and other scales that measure motor, auditory and verbal abilities. Some patients improved to a minimally conscious state while others even tried to speak to their loved ones, for perhaps the first time in years. Some patients’ functional neuroimaging results improved as well.

“This is one of those strange paradoxes where the effects of an insomnia drug seem to have the opposite effect for patients who have paralysis or neurologic conditions,” says co-author Mark Peterson, Ph.D., M.S., FACSM, assistant professor of physical medicine and rehabilitation and a member of U-M’s Institute for Healthcare Policy & Innovation and Neuroscience Graduate Program. Some families will request zolpidem after finding a case study or news article online because they feel there are no other real options for their loved ones.

But zolpidem didn’t work for everyone. The response rate in the reviewed articles was between 5 and 7 percent for patients with disorders of consciousness, and up to 24 percent or even higher for patients with movement disorders. For the subjects in this review, the most common adverse effect was that zolpidem did, in fact, sedate the patients as one would see in regular use of the drug. That happened in 13 of the 551 patients in the systematic review.

The first systematic review
Bomalaski has treated many patients affected with these disorders of consciousness and found the existing case reports quite interesting.
“I saw how these conditions affected their function and quality of life,” he says. “To see that something as simple as an average dose of a sleeping medicine had, in 15 minutes, woken someone up from a vegetative state seemed extraordinary, and I wanted to pursue it further.”

The initial search turned up more than 2,300 unique articles. After assessing the abstracts, Bomalaski’s team reduced the articles to 89. Another screening included a full read of the 89 articles, leading to a systematic review of 67 of them. Most are considered low-level evidence, including case reports and small interventional trials.

Bomalaski reviewed the 67 articles for type of disorder, dosage of zolpidem, frequency, effect and any adverse effects. Only 11 of the studies had more than 10 participants, but all together, there were 551 participants.

Guidance for future research
“This kind of report brings up more questions than answers, although something like this is really foundational to guide a larger clinical trial,” Peterson says. The next step is to study safety and efficacy, the authors say.

Another topic for more research is to assess whether the effects of zolpidem depend on the part of the brain that’s injured. The researchers report zolpidem’s unique effects may be present in patients whose basal ganglia, which help process information to perform an action, are no longer functioning correctly.
“The restorative effects on the basal ganglia may surpass the hypnotic effects on the frontal cortex,” says Bomalaski, who is headed to the University of Washington for a brain injury fellowship.

“We still need to learn much more in order to answer the question about whether we should be using this in our clinical practice.”
ABOUT THIS NEUROSCIENCE RESEARCH ARTICLE
Source: Haley Otman – University of Michigan
Image Source: NeuroscienceNews.com image is credited to Michigan Medicine.
Original Research: Abstract for “Zolpidem for the Treatment of Neurologic Disorders: A Systematic Review” by Martin N. Bomalaski, MD; Edward S. Claflin, MD; Whitney Townsend, MLIS; and Mark D. Peterson, PhD, MS in JAMA Neurology. Published online June 26 2017 doi:10.1001/jamaneurol.2017.1133


Abstract

Zolpidem for the Treatment of Neurologic Disorders: A Systematic Review
Importance Given its selective action on the ω1 subtype of the γ-aminobutyric acid A receptor, zolpidem tartrate presents a potential treatment mechanism for other neurologic disorders.

Objective To synthesize studies that used zolpidem to treat neurologic disorders.
Evidence Review Eligibility criteria included any published English-language article that examined the use of zolpidem for noninsomnia neurologic disorders in humans for all dates up to March 20, 2015. Searched databases included PubMed, Scopus, Web of Science Core Collection, the Cochrane Library, EMBASE, CENTRAL, and clinicaltrials.gov. Publication bias was mitigated by searching clinicaltrials.gov for unpublished studies. Two rounds of screening were performed based on title and then abstract, and coding was performed by 2 coders. All methods followed the PRISMA Reporting Guidelines for systematic reviews of the literature.

Findings The initial search produced 2314 articles after removing duplicates. After exclusion based on a review of abstracts, 67 articles remained for full manuscript review. Thirty-one studies treated movement disorders, 22 treated disorders of consciousness, and 14 treated other neurologic conditions, including stroke, traumatic brain injury, encephalopathy, and dementia. Study designs included case reports (n = 28), case series (n = 8), single-patient interventional (n = 13), pretest and posttest (n = 9), randomized clinical trials (n = 9), and crossover studies (n = 5). Only 11 studies had more than 10 participants. Effects of zolpidem were wide ranging (eg, improvement on the JFK Coma Recovery Scale–Revised, the Unified Parkinson Disease Rating Scale, and the Burke-Fahn-Marsden Dystonia Rating Scale) and generally lasted 1 to 4 hours before the participant returned to baseline. Sedation was the most common adverse effect.

Conclusions and Relevance Zolpidem has been observed to transiently treat a large variety of neurologic disorders, most often related to movement disorders and disorders of consciousness. Much of what is known comes from case reports and small interventional trials. These findings may represent a new treatment mechanism for these disorders.

“Zolpidem for the Treatment of Neurologic Disorders: A Systematic Review” by Martin N. Bomalaski, MD; Edward S. Claflin, MD; Whitney Townsend, MLIS; and Mark D. Peterson, PhD, MS in JAMA Neurology. Published online June 26 2017 doi:10.1001/jamaneurol.2017.1133

http://neurosciencenews.com/vegetative-state-insomnia-6979/

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