Vijaya Krishna Varanasi*
Washington State University, USA
Received Date: November 20, 2011; Accepted Date: November 25, 2011; Published Date: November 26, 2011
Citation: Varanasi VK (2011) Emerging Technologies in Stroke Rehabilitation. J Bioeng Biomed Sci S1: e001. doi: 10.4172/2155-9538.S1-e001
Copyright: © 2011 Varanasi VK, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Rehabilitation is the process of recovery of skills by an injured or ill person so as to regain his maximum independence and function in a normal or as near normal manner as possible. The goal is to decrease long-term disability. For example, rehabilitation after a stroke may help the patient walk and speak clearly again. The word comes from the Latin “rehabilitare” meaning to make fit again. Rehabilitation medicine extends from the days of inpatient care to the care given by physiatrist.
The blockage of an artery in the brain by a clot (thrombosis) is the most common cause of a stroke. The part of the brain that is supplied by the clotted blood vessel is then deprived of blood and oxygen. As a result of the deprived blood and oxygen, the cells of that part of the brain die and the part of the body that it controls stops working. Stroke, also referred to as cerebrovascular disease is the leading cause of long-term disability in the United States, increasing the costs of post-acute care and caregiver burden [3,4]. Approximately 87% of the 5.7 million deaths worldwide annually attributable to stroke occur in low-income and middle-income countries . Some of the symptoms of cerebrovascular disease include vision impairment, depression, impaired speech, paralysis, drooling or difficulty eating or swallowing, unusual movements, and seizures to name a few.
The process of stroke rehabilitation involves various professionals such as physician, nurse, occupational therapist, and speech language pathologists . For some stroke survivors, rehabilitation will be a continuous process to maintain and refine skills and could involve working with specialists for months or years after the stroke. Rehabilitation involves strengthening of both weak and intact extremities, use of aiding devices, and modification of environment at home and place of work, and prevention of disability in future . Nowadays, translational science is also considered as an important part of the rehabilitation process. This is because differences in the recovery process between patients are due to differences in the brain networks underlying the desired behavior . Rehabilitation experts conform to the general view that the most important element in any rehabilitation program is carefully supervised, well focused, repetitive practice. The next few paragraphs will discuss emerging and upcoming technologies in stroke rehabilitation.
Constraint induced movement therapy
Developed and studied by Knapp , Constraint induced movement therapy (CIMT) is based on the fact that a person with an physical or speech impairment develops a “learned nonuse” by compensating for their lost function with other means such as using an unaffected limb by a paralyzed individual or a drawing by an individual with aphasia . In constraint induced movement therapy, the normal limb is constrained with a glove or sling and the patient is forced to use their affected limb. In various CIMT studies, there was a great improvement in hemiparetic limb function. A similar approach based on the concept of CIMT known as Constraint induced aphasia therapy (CIPT) was also devised. Here the individuals are encouraged to use their remaining verbal abilities to succeed in their communication . Mention has to be made regarding various noninvasive brain stimulation technologies such as transcranial magnetic or current stimulation which may improve language performance in poststroke aphasia [12,13]. It is believed that CIMT works by the mechanism of increased neuroplasticity which normally occurs during childhood development, after physical injury such as loss of a limb or sense organ, and during restoration of learning skills.
In CIMT, the patients undergo training involving repetitive movements known as “shaping” for 7 hours/day (with intervals of course) for all weekdays during 2-3 week period . A device that allows patients to undergo training at home without direct supervision could make CIMT more accessible for people suffering with stroke injuries. This could significantly cut down the cost of the therapy. It is still debatable whether submission to such an intensive training protocol is possible without face-to-face interaction and motivation from therapists and trainers.
Body-weight-supported gait training
“Body weight supported” (BWS) locomotion training is a treatment therapy for individuals having spinal cord injury, stroke, and other neurological disorders that impair movement. The process of BWS involves partial unloading of the limbs and assistance of leg movements during stepping on a treadmill . The effort needed by the therapist to set the paretic limbs and to control weight shift likely limits the intensity of BWS therapy . BWS training improves stepping and walking . Regaining gait by BWS system results in bi-hemispheric activation both in cortical and subcortical regions of the brain .
So far the results for BWS training have been mixed with some studies indicating treadmill training and manual assistance failing to show superior gait function and walking in stroke patients . In another study walking ability positively correlated with gait ability in stroke patients . Use of both “electromechanical gait trainer” as well as traditional physical therapy significantly improved ambulatory ability in patients . More such treadmill vs elliptical trainer studies are needed in future to arrive at a right therapy regimen for rehabilitation of stroke patients.
Functional electrical stimulation (FES)
In the hemiparetic stroke patients suffering from weakness on one side of their bodies FES could bypass the central nervous system input to the muscles of the affected limb. Electric impulses are given to the peripheral nerve to generate action potentials in motoneurons, which in turn radiates to the muscle causing its contraction . FES therapy was found to be especially effective in the upper extremity to activate the posterior interosseous nerve of the forearm to initiate extension at the wrist.
Robotic-assisted therapies focus on both upper and lower extremities of the body and allow patients to train independently . MIT-MANUS robot developed by the Interactive Motion Technologies Inc., Cambridge, Massachusetts, USA allows patients to accomplish reaching movements in the horizontal plane. Studies indicated that upper extremity robotic treatment results in improved upper extremity motor recovery compared to traditional rehabilitation therapies . One recent study contradicted this claim and found that robot-assisted therapy using MIT-MANUS system did not significantly improve motor function at 12 weeks after initiation of therapy . Lokomat (Hocoma Ag, Volketswil, SZ) is a robotic-assisted lower extremity device providing active control at the hip and knee and passive control at the ankle. Participants who received conventional gait training experienced significantly greater gains in walking speed and distance than those trained on the Lokomat . The studies conducted so far have shown mixed results. Additional trials need to be carried out to confirm if any the significant advantages of using robotic-assisted technologies in rehabilitation.
Knowledge and awareness about stroke and its rehabilitation is increasingly important. Training focused on stroke prevention, care, and rehabilitation has been formalized in developed countries . Stroke units and rehabilitation centers have become quite common in developed countries but not so much in developing countries. The need of the hour is to improve the stroke related education in developing countries. People should be made aware of the various rehabilitation programs that exist in their community. Various programs currently exist which disseminate information related to HIV/AIDS, malaria, and other infectious diseases but not for rehabilitation of stroke victims. The development and implementation of new rehabilitation therapies and the dissemination of new and existing information to the target audience is critical. I am sure the Journal of Bioengineering & Biomedical Science from OMICS Publishing Group will play a major role in this regard.