Cluster headache: a rare cause of bradycardia.
D001919:Bradycardia / Q000209:etiology*; D004878:Ergotamine / Q000008:administration & dosage / Q000009:adverse effects; D006261:Headache / Q000150:complications* / Q000188:drug therapy; D006632:Histamine / Q000502:physiology; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D008875:Middle Aged
D006632:Histamine; D004878:Ergotamine