title: Letter: Dual A-V nodal pathways and preexcitation.
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D013614:Tachycardia, Paroxysmal / Q000503:physiopathology