title: Obstructive sleep apnea presenting as pseudopheochromocytoma: a case report.
abstract: Sudden arousal from sleep causes a transient surge in sympathetic nervous activity. Repeated arousals, as occur in obstructive sleep apnea (OSA), are well documented to cause a more prolonged sympathetic overactivity and consequent elevations in 24-h urinary catecholamine levels. We describe here a series of five patients, each presenting with a clinical and biochemical picture indistinguishable from that of pheochromocytoma. Thorough investigations have failed to find catecholamine-secreting tumor in any of these subjects, but all have been diagnosed with OSA. Primary treatment of OSA with nasal continuous positive airways pressure has led to normalization of systemic blood pressure and urinary catecholamines. Pseudopheochromocytoma is therefore a rare, but treatable, presentation of obstructive sleep apnea.
authors.affiliation: Department of Endocrinology, St Bartholomew's Hospital, London, United Kingdom EC1A 7BE.
authors.forename: L J
authors.initials: LJ
authors.lastname: Hoy
authors.forename: M
authors.initials: M
authors.lastname: Emery
authors.forename: J A
authors.initials: JA
authors.lastname: Wedzicha
authors.forename: A G
authors.initials: AG
authors.lastname: Davison
authors.forename: S L
authors.initials: SL
authors.lastname: Chew
authors.forename: J P
authors.initials: JP
authors.lastname: Monson
authors.forename: K A
authors.initials: KA
authors.lastname: Metcalfe
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000175:diagnosis*; D000328:Adult; D002395:Catecholamines / Q000097:blood / Q000652:urine; D045422:Continuous Positive Airway Pressure; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010673:Pheochromocytoma / Q000175:diagnosis*; D020181:Sleep Apnea, Obstructive / Q000097:blood / Q000175:diagnosis* / Q000628:therapy / Q000652:urine
chemical_list: D002395:Catecholamines