title: Electromyography tests in patients with implanted cardiac devices are safe regardless of magnet placement.
abstract: BACKGROUND
  
  
  
  METHODS
  We compared the problems or complications associated with electrodiagnostic testing in 77 patients with implanted cardiac devices. Thirty tests were performed after magnet placement, and 47 were performed without magnet application.
  
  
  RESULTS
  All electrodiagnostic tests were performed safely in all patients without any serious effect on the implanted cardiac devices with or without magnet placement. A significantly higher number of patient symptoms and procedure changes were reported in the magnet group (P < 0.013). No statistical difference was found in the testing difficulty or ECG changes.
  
  
  CONCLUSIONS
  The magnet group patients had an approximately 11-fold greater risk of symptoms than those in the control group. Our data do not support a recommendation that magnet placement is necessary for routine electrodiagnostic testing in patients with implanted cardiac devices, as long as our general and specific guidelines are followed.
authors.affiliation: Department of Neurology, The University of Alabama at Birmingham, UAB Station, Birmingham, Alabama 35294, USA.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ohira
authors.forename: Jade
authors.initials: J
authors.lastname: Silcox
authors.forename: Deavin
authors.initials: D
authors.lastname: Haygood
authors.forename: Valerie
authors.initials: V
authors.lastname: Harper-King
authors.forename: Mohammad
authors.initials: M
authors.lastname: Alsharabati
authors.forename: Liang
authors.initials: L
authors.lastname: Lu
authors.forename: Marla B
authors.initials: MB
authors.lastname: Morgan
authors.forename: Angela M
authors.initials: AM
authors.lastname: Young
authors.forename: Gwen C
authors.initials: GC
authors.lastname: Claussen
authors.forename: Peter H
authors.initials: PH
authors.lastname: King
authors.forename: Shin J
authors.initials: SJ
authors.lastname: Oh
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D017147:Defibrillators, Implantable / Q000009:adverse effects*; D004576:Electromyography / Q000009:adverse effects* / Q000379:methods; D005260:Female; D006801:Humans; D059346:Magnets; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D061214:Patient Safety