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<div about="/news-events/nih-research-matters/stroke-patients-may-benefit-brain-stimulation" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2023-09-05T00:00:00-04:00" class="date-display-single">September 5, 2023</span></p><div class='syndicate'><h1>Stroke patients may benefit from brain stimulation </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul>
<li>In a small trial, deep brain stimulation plus physical therapy helped improve upper limb function in some patients who had impaired movement after a stroke.</li>
<li>The effectiveness of the approach would need to be confirmed in larger trials before it could be considered for broader use.</li>
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<picture title="Illustration showing a lead implanted in the lower rear of the brain and stimulating nerves that connect to other brain regions.">
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2023/20230905-stroke.jpg?itok=_3NZO8o2&amp;timestamp=1693922008" alt="Illustration showing a lead implanted in the lower rear of the brain and stimulating nerves that connect to other brain regions." title="Illustration showing a lead implanted in the lower rear of the brain and stimulating nerves that connect to other brain regions." />
</picture><span class="caption">A single DBS lead is implanted into the cerebellum, with nerve fibers extending from the implant region through the thalamus and into the motor cortex. </span><span class="credit">Cleveland Clinic Foundation</span></div>
</div><p>Stroke is a leading cause of death and serious long-term disability in the United States. About half of those who survive a stroke are left with ongoing impairments that affect their everyday activities, such as walking or lifting objects. Physical therapy can help to improve movement and reduce symptoms. But its benefits often level off about a year following the stroke.</p>
<p>Scientists have been exploring the possibility of encouraging the brain to form new connections between nerve cells by using electrical stimulation. The approach, called deep brain stimulation, delivers constant electrical stimulation to a particular brain region through a surgically implanted thin wire, or electrode.</p>
<p>A research team co-led by Drs. André Machado and Kenneth B. Baker of the Cleveland Clinic targeted a brain region called the dentate nucleus. It lies within the brains cerebellum, in the lower back of the head. The cerebellum is known to play a role in coordinating muscle movements. Decades of animal studies have shown that the dentate nucleus is a key connector that helps link the cerebellum to the motor cortex, which controls voluntary movements.</p>
<p>In a phase 1 clinical trial, the team enrolled 12 people who had moderate to severe impairment of their upper limbs one to three years after a stroke. At the start of the study, participants engaged in a month of physical therapy twice a week to rule out possible recovery based on physical therapy alone. Each then underwent surgery to insert the electrode in the brains dentate nucleus. After a recovery period, physical therapy continued, and deep brain stimulation was delivered continuously for four to eight months. Results were reported in <em>Nature Medicine</em> on August 14, 2023.</p>
<p>The researchers found that their technique of combining deep brain stimulation with physical therapy was safe. No serious adverse events or device failures were noted. Nine of the 12 participants had improved motor function after the treatment. These improvements continued even after stimulation was turned off.</p>
<p>Importantly, the length of time since a patients stroke did not seem to affect the potential for improvement. But the level of motor function in the hand did seem relevant to recovery. Participants who had retained some level of motor function in the hand had clinically significant improvement. Those with a low level of motor function showed only minor gains.</p>
<p>“The results of the study found that deep brain stimulation, paired with physical therapy, improved movement in patients who were more than a year out from their stroke and whose motor improvements had largely plateaued,” Baker says. “This tells us the research warrants further investigation in larger patient samples.”</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/new-insights-into-brain-s-motor-cortex" target="_top">New Insights Into the Brains Motor Cortex </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/spinal-cord-stimulation-improves-arm-hand-movements-after-stroke" target="_top">Spinal Cord Stimulation Improves Arm, Hand Movements After Stroke</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/critical-time-window-rehabilitation-after-stroke" target="_top">Critical Time Window for Rehabilitation After a Stroke </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/adaptive-deep-brain-stimulation-parkinsons-disease" target="_top">Adaptive Deep Brain Stimulation for Parkinsons Disease </a></li><li><a href="https://www.ninds.nih.gov/health-information/public-education/know-stroke" target="_top">Know Stroke</a></li><li><a href="https://www.ninds.nih.gov/health-information/disorders/stroke" target="_top">Stroke</a></li><li><a href="https://www.ninds.nih.gov/health-information/public-education/brain-basics/brain-basics-know-your-brain" target="_top">Brain Basics: Know Your Brain</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="https://pubmed.ncbi.nlm.nih.gov/37580534/">Cerebellar deep brain stimulation for chronic post-stroke motor rehabilitation: a phase I trial.</a> Baker KB, Plow EB, Nagel S, Rosenfeldt AB, Gopalakrishnan R, Clark C, Wyant A, Schroedel M, Ozinga J 4th, Davidson S, Hogue O, Floden D, Chen J, Ford PJ, Sankary L, Huang X, Cunningham DA, DiFilippo FP, Hu B, Jones SE, Bethoux F, Wolf SL, Chae J, Machado AG. <em>Nat Med</em>. 2023 Aug 14. doi: 10.1038/s41591-023-02507-0. Online ahead of print. PMID: 37580534.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs BRAIN Initiative and Enspire DBS.</p>
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