title: Fatal undersensing of ventricular fibrillation due to intermittent high-amplitude R waves.
abstract: A 48-year-old man was admitted after an episode of aborted sudden death with external defibrillation. An implantable cardioverter defibrillator implanted 2 years before for secondary prevention failed to sense properly an episode of ventricular fibrillation. Interrogation of the device showed large oscillatory changes of the amplitude of the local electrogram during ventricular fibrillation, causing undersensing and inappropriate refraining from shock therapy.
authors.affiliation: Cardiovascular Diseases Group (Bellvitge Biomedical Research Institute) IDIBELL, Bellvitge University Hospital-ICS, L'Hospitalet de Llobregat, Barcelona, Spain. ignasi.anguera@gmail.com
authors.forename: Ignasi
authors.initials: I
authors.lastname: Anguera
authors.forename: Xavier
authors.initials: X
authors.lastname: Sabaté
authors.forename: Gemma
authors.initials: G
authors.lastname: Sugrañes
authors.forename: Angel
authors.initials: A
authors.lastname: Cequier
mesh_terms: D016757:Death, Sudden, Cardiac / Q000209:etiology* / Q000517:prevention & control; D017147:Defibrillators, Implantable / Q000009:adverse effects*; D015716:Electrocardiography, Ambulatory / Q000009:adverse effects*; D017809:Fatal Outcome; D006801:Humans; D008297:Male; D008875:Middle Aged; D014693:Ventricular Fibrillation / Q000150:complications / Q000175:diagnosis* / Q000517:prevention & control*