"During seizures, a patient's heart rate most often increases significantly, but in about 1 percent of this population, a seizure will lead to the heart stopping for a brief period of time," says Jeffrey W. Britton, M.D., a Mayo Clinic neurologist and member of the research team.
"The heart almost always restarts on its own, but sometimes as much as 20 to 30 seconds can pass where no blood flows to the brain and causes the patient to collapse and fall during a seizure."
The brief period when the heart stops can lead to significant injury. "In this study, we wanted to determine if, in addition to medication, there would be any benefit to reducing falls by implanting a pacemaker," says researcher Brian D. Moseley, M.D., a Mayo Clinic resident and neurology instructor.
Researchers identified seven patients who were diagnosed with ictal asystole and had a history of falls associated with it before undergoing cardiac pacing at Mayo Clinic between 1990 and 2004.
Patients with the condition were identified through observation of their seizures during computer-assisted continuous video electroencephalography/electrocardiography (EEG/ECG).
Researchers found the rate of injury and falls declined after the patients received their implants. "Before implantation, the average fall rate was more than three falls per month; following implantation, this was reduced to 0.005 falls per month," Dr. Britton says.
In addition, three of the seven patients needed less seizure medication after receiving their implants. "This may argue that in addition to helping reduce falls there may be some anti-seizure properties associated with pacemaker implantation. That's an exciting finding that needs to be studied some more," says Dr. Moseley.
Other members of the Mayo Clinic research team include Gena Ghearing, M.D., now of the University of Pittsburgh Medical Center, and Thomas Munger, M.D. The study was published online February 14, 2011.About Mayo Clinic
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