title: Endless loop tachycardia in an AV universal [DDD] pacemaker.
abstract: Implantation of an AV universal [DDD] pacemaker, stimulating and sensing both atrium and ventricle caused a pacemaker mediated tachycardia, begun by a P wave occurring after a premature ventricular contraction, and sustained by P waves caused by retrograde AV conduction. The tachycardia was terminated by application of a magnet to the pulse generator which temporarily made it insensitive to incoming signals, both P and QRS.
mesh_terms: D001919:Bradycardia / Q000628:therapy; D009202:Cardiomyopathies / Q000628:therapy; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000628:therapy; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D013610:Tachycardia / Q000175:diagnosis / Q000209:etiology*