title: [Hyperthyroidism and atrioventricular heart block (author's transl)].
abstract: Two cases of thyrotoxicosis including a first-degree heart block are reported; a study of action potentials of the bundle of His was achieved in the second case. The association atrioventricular block-hyperthyroidism is unusual but does not seem to be a pure coincidence. The direct effect of thyroid hormon on the myocardium is supposed to be responsible for the conduction disturbance; its disappearance with the cure of the thyrotoxicosis is a favourable argument for a relation of causality. The therapeutic consequence of this association is to exclude completely the use of betablockers.
mesh_terms: D000200:Action Potentials; D000293:Adolescent; D002036:Bundle of His / Q000503:physiopathology; D005260:Female; D006111:Graves Disease / Q000150:complications; D006327:Heart Block / Q000150:complications* / Q000503:physiopathology; D006801:Humans; D006980:Hyperthyroidism / Q000150:complications*
vernacular_title: Hyperthyroïdie et bloc auriculo-ventriculaire.