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Gamma Knife Surgery Benefits People with Epilepsy
December 13, 2011Send to a Friend
New research study results have continued to show the potential benefits of a new type of surgery that could reduce the frequency of epileptic seizures. This surgery procedure is applicable for some people who have with seizures caused by lesions in the brain. The procedure is called gamma knife surgery. It uses a type of laser technology to eliminate lesions in the brain that could cause seizures. The latest findings about this procedure are particularly notable in that other positive results have been found. This includes improvements on cognition, mood, and behaviour. Below is a press release from the American Epilepsy Society about these findings.
Gamma Ray Surgery Benefits Epilepsy Patients Beyond Seizure Reduction
Neurosurgeons continue to explore minimally invasive surgery with gamma radiation (gamma knife surgery, GKS) in the treatment of brain lesions causing seizures and epilepsy. Studies of the procedure are showing it to be an effective alternative to invasive microsurgery for hypothalamic hamartomas and other lesions that lie deep within the brain. Prospective research by investigative teams in Canada and France, and presented at the American Epilepsy Society’s 65th annual meeting, reveals that gamma knife surgery in hypothalamic hamartomas has significant benefit in the lives of patients beyond seizure reduction.
The hypothalamus lies near the brain stem and controls a number of functions such as body temperature, circadian cycles, and sleep. Hamartomas are abnormal clumps or masses of normal tissue attached to functional tissue. The lesions are present at birth and may provoke intractable seizures, including laughing seizures, and lead to precocious puberty, and cognitive deficits.
Jean Regis and his team of investigators at Timone University Hospital, France, are studying the long-term results of gamma knife surgery for hypothalamic hamartomas in pediatric patients as young as 3 years of age. Of patients treated between January 1999 and December 2007, 40 have been evaluated for at least 3 years postsurgery. The evaluations include seizure record review, neuropsychogical tests, psychiatric evaluation, endocrinology evaluation, and visual field and acuity analysis.
The number of seizures following gamma knife surgery was dramatically decreased from a median of 92 seizures per month preoperatively to 6 seizures per month after the procedure. Global psychiatric and cognitive comorbidity was improved in 56% of patients, considered to be cured in 28%, remained unchanged in 8%, and continued to worsen in 8% of patients.
“This prospective trial is demonstrating very good safety and efficacy of gamma knife radiosurgery in the long term,” says Regis. “Beyond seizure reduction, the improvement in psychiatric and cognitive domains, school performance, and social integration appears to be a major benefit for children with this frequently catastrophic condition. We will continue to follow these children to observe any changes that might occur in their condition as they age.”
In another study, conducted at the Centre Hospitalier Universitaire de Sherbrooke in Canada, investigators evaluated gamma knife surgery for hypothalamic hamartoma in a small group of older patients 14 to 57 years of age. In this group, 66% of patients were seizure free at the time of evaluation. The mean time to seizure freedom following treatment was 18 months. Patients in whom there was little or no reduction in seizures had larger lesions than in the seizure free cohort.
“We found that when the entire lesion could be targeted, radiosurgery did more than reduce the seizures,” says lead author Pascale Bourgeois. “There also were encouraging effects on cognition and quality of life. While the procedure is ineffective for large lesions, gamma knife surgery should be a first line surgical therapy for small hamartomas.’
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