title: [Reason for worry: syncope in the morning].
authors.forename: H S
authors.initials: HS
authors.lastname: Füessl
mesh_terms: D000889:Anti-Arrhythmia Agents; D002940:Circadian Rhythm; D016757:Death, Sudden, Cardiac / Q000209:etiology*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005424:Flecainide; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013575:Syncope / Q000209:etiology*; D013577:Syndrome
chemical_list: D000889:Anti-Arrhythmia Agents; D005424:Flecainide