title: Sleep apnea in acromegaly.
abstract: OBJECTIVE
  To provide information on the nature, prevalence, and severity of sleep apnea in patients with acromegaly.
  
  
  METHODS
  Consecutive case series.
  
  
  METHODS
  Tertiary referral hospital.
  
  
  METHODS
  Fifty-three patients with acromegaly were consecutively referred: 33 patients were referred because of clinical suspicion of sleep apnea and 20 patients were referred without suspected apnea.
  
  
  METHODS
  Sleep studies as well as growth hormone and insulin-like growth factor 1 (IGF-1) measurements were done.
  
  
  RESULTS
  Thirty-one patients (93%; 95% Cl, 85% to 100%) referred because of suspicion of sleep apnea had sleep apnea compared with 12 patients (60%; Cl, 37% to 83%) referred without suspected sleep apnea. Patients with sleep apnea did not have biochemical evidence of increased disease activity (random growth hormone, 12.7 +/- 4.4 micrograms/L; mean growth hormone at 24-hour sampling, 10.8 +/- 8.4 micrograms/L; IGF-1, 90.0 +/- 7.5 nmol/L) compared with patients without sleep apnea (random growth hormone, 14.2 +/- 4.9 micrograms/L, P greater than 0.2; mean growth hormone, 12.4 +/- 3.5 micrograms/L, P greater than 0.2; IGF-1, 90.0 +/- 10.0 nmol/L, P greater than 0.2). Central sleep apnea was the predominant type of apnea in 33% (Cl, 18% to 47%) of patients and was associated with higher random growth hormone and IGF-1 levels than was obstructive apnea (random growth hormone, 23.4 +/- 3.9 compared with 8.8 +/- 3.1 micrograms/L, P less than 0.001; IGF-1, 126 +/- 17.5 compared with 72.5 +/- 7.5 nmol/L, P less than 0.01).
  
  
  CONCLUSIONS
  Sleep apnea is common in acromegaly. The rate of central sleep apnea was unexpectedly high in patients with acromegaly, and biochemical evidence of increased disease activity was associated with the presence of central apnea rather than with the degree of sleep apnea. Altered respiratory control is a possible mechanism producing sleep apnea in acromegaly.
authors.affiliation: Royal Prince Alfred Hospital, Sydney, Australia.
authors.forename: R R
authors.initials: RR
authors.lastname: Grunstein
authors.forename: K Y
authors.initials: KY
authors.lastname: Ho
authors.forename: C E
authors.initials: CE
authors.lastname: Sullivan
mesh_terms: D000172:Acromegaly / Q000097:blood / Q000150:complications* / Q000503:physiopathology; D000328:Adult; D005260:Female; D013006:Growth Hormone / Q000097:blood*; D006801:Humans; D006973:Hypertension / Q000145:classification; D007334:Insulin-Like Growth Factor I / Q000032:analysis; D008297:Male; D008875:Middle Aged; D011863:Radioimmunoassay; D012129:Respiratory Function Tests; D012891:Sleep Apnea Syndromes / Q000097:blood / Q000209:etiology* / Q000503:physiopathology
chemical_list: D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone