A examination of seven patients with Parkinson’s complaint suggests that those who have meagre results following implantation of electrodes to stimulate the brain may fringe benefits from additional surgery to meet the electrode placement, according to a report in the May end of Archives of Neurology, in unison of the JAMA/Archives journals.

Implanting electrodes that stimulate the subthalamic nucleus, a province wise in the perceptiveness potentially related to impulsivity, is effective in reducing medication doses and improving the symptoms of Parkinson’s virus, according to background news in the article. With this treatment, medication doses are often reduced by 50 percent to 65 percent, and scores on scales measuring motor function (generally impaired in Parkinson’s disease) typically look up by 40 percent to 70 percent. Anyhow, sometimes the surgery is less serviceable.

“The leading cause of these trivial results arises from imprecision of electrode arrangement, leading to non-stimulation of the butt as required,” the authors write. “Misplacement of the electrode by only a insufficient millimeters may have occurred.”

Mathieu Anheim, M.D., of the University Sanitarium A. Michallon, Strasbourg, France, and colleagues studied seven consecutive patients length of existence 49 to 70 with Parkinson’s disease who, regardless of electrode implantation, continued to experience severe symptoms. The patients were operated on again and the electrodes were re-implanted 12 to 23 months after the original surgery. Motor scores and medication doses were assessed one year after the second procedure.

All patients except for a given displayed enhancement after the second surgery. When they were not on medication, treatment improved the patient’s motor scores by 26.7 percent following the first working and 59.4 percent following the second procedure. Their dose of levodopa, a medication treating Parkinson’s disease, decreased from 1,202 milligrams to 534 milligrams. The average space between the electrodes and the target place emphasis on of stimulation-a location in the subthalamic nucleus identified by evaluating electrode placement in patients whose surgery was well-fixed-decreased from 5.4 to 2 millimeters. The shorter this distance, the greater the patient’s rehabilitation in motor scores.

“Although impound patient pick is important for the desired surgical after-effect, the key to marked improvement following subthalamic nucleus stimulation is optimal surgical skill for error-free implantation of stimulation electrodes in the aim. Although neurosurgeons aim to minimize shifts from the at planned electrode positions, this does not exclude the potential that inadequate surgical technique may be responsible with a view postoperative lack of benefit,” the authors belittle delete. “Patients demonstrating poor as a church-mouse reply to subthalamic nucleus stimulation as a result of electrode misplacement can benefit from re-implantation in the subthalamic nucleus closer to the theoretical target.”

Roguish Neurol. 2008;65[5]:612-616.

Archives of Neurology

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