The simultaneous stimulation of the motor nerves of the brain and limbs (paired associative stimulation) has yielded promising research results. Research conducted at the BioMag Laboratory, operated by the University of Helsinki, Helsinki University Hospital, and Aalto University, has previously demonstrated that simultaneous transcranial magnetic stimulation of the brain and electrical stimulation of the limb nerves constitute a useful method of motor rehabilitation in patients suffering from spinal cord injuries.
Prior case studies have shown that synchronized stimulation of the brain and limb nerves strengthens neural connections and, thus, can restore patients' mobility.
Now, researchers at the laboratory have, for the first time, looked into the potential of paired associative stimulation therapy in treating incomplete paraplegia, investigating how stimulation therapy can promote the recovery of walking ability when combined with walking rehabilitation.
The results of the recently completed case study have been published in the Spinal Cord Series and Cases journal.
"We demonstrate for the first time that paired associative stimulation helped a paraplegic patient walk and promoted his walking rehabilitation. Stimulation therapy has already previously been found to be a potential mode of treatment for spinal cord injuries. These findings spur us on to continue investigating paired associative stimulation," says Anastasia Shulga, a neuroscientist and medical doctor from the University of Helsinki who headed the case study.
A spinal cord injury patient regained the ability to walk independently with the help of a rolling walker
In the case study, stimulation therapy was given to a 47-year-old male whose lower limbs were partially paralyzed due to a spinal cord injury. The patient's right leg had spontaneously recovered almost all of its function in the year after the injury, but the left leg's functionality had recovered only partially, leaving the patient unable to walk. A year after the trauma, his left leg received stimulation treatment for three months. This three-month treatment was repeated two years after the trauma.
Prior to the stimulation treatment, the patient was unable to stand without considerable body weight support. As it was considered fruitless, conventional walking rehabilitation was not initiated.
After the first three-month stimulation period, the patient was able to stand for 1.5 minutes and take 13 steps on parallel bars without weight support. Thanks to this improvement, the patient was enrolled in walking rehabilitation after the treatment period, achieving independent walking ability with the help of a rollator.
During the second three-month treatment period, his walking distance grew 2.4 times faster compared to the previous period when he received no stimulation. Furthermore, the left leg had recovered its strength to a considerable degree, while the score for the measure describing the patient's independent functioning had also improved. No adverse effects were caused by the treatment.
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