Brain implant better than meds for Parkinson's disease

JAMA study as summarized by CNN:

"People with Parkinson's disease who have a pacemaker-like device implanted in the brain spend an extra four-plus hours a day free of tremors and involuntary movements than they do on medication, according to the largest study of the treatment, which is known as deep brain stimulation....

"* Brain implant gave Parkinson's patients more tremor-free hours daily than meds
* Deep brain stimulation delivers electrical impulses to movement control center
* Surgery is complicated, carries risks including infection, depression
* Treatment, introduced in 1990s, becoming more widely accepted"