title: Letter: Syncope and heart block.
mesh_terms: D001020:Aortic Stenosis, Subvalvular / Q000150:complications; D004594:Electrophysiology; D006327:Heart Block / Q000150:complications* / Q000401:mortality / Q000503:physiopathology; D006801:Humans; D013575:Syncope / Q000209:etiology*