title: Letter: Late supernormal excitation.
mesh_terms: D000200:Action Potentials; D000818:Animals; D006328:Cardiac Catheterization; D004285:Dogs; D004558:Electric Stimulation; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans