title: [The mechanism of electrical alternation].
mesh_terms: D002675:Child, Preschool; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010493:Pericarditis / Q000503:physiopathology*
vernacular_title: Acerca del mecanismo de la alternancia eléctica.