Chris, What is it about the surgery that causes nearly all PD symptoms to disappear completely or improve dramatically immediately after the biSTN procedure even before the stimulators are turned on? Why does this "surgical effect" wear off after about a week to 10 days if the stimulators have not been turned on? At least that was our experience. Paul -----Original Message----- From: Chris van der Linden <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Sunday, October 24, 1999 4:45 AM Subject: Re: Stim Setting By the way, the theory of brain swelling after STN surgery is not correct. Stim. parameter adjustments can be done right after surgery. The response is immediate and the worsening after stopping stimulation is very evident. Greetings, Chris van der Linden, M.D