title: Bradydysrhythmia-related presyncope secondary to pheochromocytoma.
abstract: Pheochromocytoma endures as a life-threatening disorder. In the absence of systemic hypertension, diagnosis may be difficult. We present a 46-year-old normotensive male with a history of presyncope. One of these episodes could be documented, and revealed symptomatic bradycardia suspicious of sinus node arrest. Due to hints of an elevated sympathetic tone (Schellong test, circadian blood pressure pattern without diurnal rhythm) 24-h urinary catecholamine concentrations were measured and found increased. MIBG-scintigraphy and abdominal-computed tomography indicated the location of the pheochromocytoma. After removal of the tumour, no further episodes of presyncopes or bradydysrhythmias were observed.
authors.affiliation: Department of Internal Medicine, Karl-Franzens-University of Graz, Austria.
authors.forename: R
authors.initials: R
authors.lastname: Zweiker
authors.forename: M
authors.initials: M
authors.lastname: Tiemann
authors.forename: B
authors.initials: B
authors.lastname: Eber
authors.forename: M
authors.initials: M
authors.lastname: Schumacher
authors.forename: F M
authors.initials: FM
authors.lastname: Fruhwald
authors.forename: R
authors.initials: R
authors.lastname: Lipp
authors.forename: S
authors.initials: S
authors.lastname: Lax
authors.forename: H
authors.initials: H
authors.lastname: Pristautz
authors.forename: W
authors.initials: W
authors.lastname: Klein
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000150:complications* / Q000175:diagnosis* / Q000473:pathology; D001919:Bradycardia / Q000150:complications* / Q000209:etiology; D003560:Cysts; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010673:Pheochromocytoma / Q000150:complications* / Q000175:diagnosis* / Q000473:pathology; D013575:Syncope / Q000209:etiology*