Q. Pacemakers and Licensed Pilots
According to the Federal Aviation Administration's Office of Aerospace Medicine, having a pacemaker is a disqualifying condition for a pilot, as stated in 14 CFR 67.111(a)(5), 67.211(e), and 67.311(e). It is possible to apply for a special issuance, as stated in 67.401, at the discretion of an aviation medical examiner. You can read these regulations here.
You can find a directory of aviation medical examiners at this site: http://www.faa.gov/pilots/amelocator/
The FAA home page is: http://www.faa.gov