title: [Letter: Is it possible to interpret the different varieties of second-degree atrio-ventricular block?].
mesh_terms: D004562:Electrocardiography; D006327:Heart Block / Q000145:classification* / Q000175:diagnosis; D006801:Humans
vernacular_title: L'interprétation des diverses variétés du bloc auriculo-ventriculaire du  2e degré est-elle possible.