title: Increase in internal defibrillation threshold during acute myocardial infarction.
abstract: A 67-year-old man suffered an acute anteroseptal myocardial infarction complicated by multiple episodes of ventricular fibrillation, which were not systematically defibrillated by maximum, internal 35-J shocks delivered by an implanted cardioverter defibrillator (ICD). He had suffered from acute inferior myocardial infarction 6 years earlier, complicated with sustained polymorphic ventricular tachycardia (VT). Due to inducibility of sustained VT on an electrophysiologic study, an ICD was implanted. Defibrillation testing performed after healing of anteroseptal infarction was successful with a 10-J safety margin, suggesting that acute myocardial ischemia transiently elevated the internal defibrillation threshold.
authors.affiliation: Department of Medicine and Biological Science, Gunma University Graduate School of Medicine, Maebashi.
authors.forename: Masaki
authors.initials: M
authors.lastname: Ota
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Tadashi
authors.initials: T
authors.lastname: Nakajima
authors.forename: Akihiro
authors.initials: A
authors.lastname: Saito
authors.forename: Tadanobu
authors.initials: T
authors.lastname: Irie
authors.forename: Toshimitsu
authors.initials: T
authors.lastname: Kato
authors.forename: Takafumi
authors.initials: T
authors.lastname: Iijima
authors.forename: Toshio
authors.initials: T
authors.lastname: Ito
authors.forename: Mamoru
authors.initials: M
authors.lastname: Manita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Kurabayashi
mesh_terms: D000368:Aged; D017147:Defibrillators, Implantable; D004562:Electrocardiography; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000503:physiopathology* / Q000628:therapy