title: Supernormal excitation in pacemaker exit block.
mesh_terms: D000368:Aged; D004868:Equipment Failure; D005071:Evoked Potentials; D005260:Female; D006321:Heart / Q000503:physiopathology*; D006327:Heart Block / Q000209:etiology* / Q000503:physiopathology; D006801:Humans; D010138:Pacemaker, Artificial