title: Paradoxical undersensing due to quiet timer blanking.
abstract: A case of undersensing of atrial activity by a dual chamber pacemaker is presented. Programming to more sensitive voltages exacerbated undersensing, and programming to less sensitive levels resolved the undersensing. The mechanism by which pacemaker sense amplifiers function to create apparent paradoxical undersensing is reviewed.
authors.affiliation: Mayo Clinic, Rochester, Minnesota, USA.
authors.forename: Amy L
authors.initials: AL
authors.lastname: Beeman
authors.forename: Gregg
authors.initials: G
authors.lastname: Deutsch
authors.forename: Robert F
authors.initials: RF
authors.lastname: Rea
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000175:diagnosis* / Q000503:physiopathology; D001282:Atrial Flutter / Q000175:diagnosis* / Q000503:physiopathology; D004868:Equipment Failure; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D012680:Sensitivity and Specificity