title: Sleep disordered breathing in patients with cluster headache.
abstract: OBJECTIVE
  To study subjects with active or inactive cluster headache (CH) for occult sleep disordered breathing (SDB).
  
  
  BACKGROUND
  CH frequently occurs during sleep. The authors previously found that symptoms of SDB predicted reported occurrence of CH in the first half of the night, which suggested that CH could be triggered in some cases by unrecognized SDB.
  
  
  METHODS
  The authors performed polysomnography in 25 adults (22 men) with CH. Subjects were not selected for any sleep-related complaint. In addition to standard measures, studies included monitoring of end-tidal carbon dioxide (n = 22), and esophageal pressure (n = 20).
  
  
  RESULTS
  The rate of apneas and hypopneas per hour of sleep was >5 in 20 subjects (80%; 95% CI, 64% to 96%), minimum oxygen saturation was <90% in 10 subjects, maximum negative esophageal pressure ranged from -13 to -65 cm H2O, and maximum end-tidal carbon dioxide was > or =50 mm Hg in eight subjects. The eight subjects with active (versus inactive) CH at the time of study had higher maximum end-tidal carbon dioxide levels (50 +/- 3 versus 44 +/- 5 mm Hg; p = 0.0007). More severe oxygen desaturation was associated with reports that CH typically occurred in the first half of the nocturnal sleep period (p = 0.008).
  
  
  CONCLUSIONS
  SDB occurred in the majority of patients with CH. Evaluation of a patient with CH should include consideration that SDB may be present.
authors.affiliation: Sleep Disorders Center, Department of Neurology, University of Michigan, Ann Arbor 48109-0117, USA. chervin@umich.edu
authors.forename: R D
authors.initials: RD
authors.lastname: Chervin
authors.forename: S N
authors.initials: SN
authors.lastname: Zallek
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.forename: J M
authors.initials: JM
authors.lastname: Hall
authors.forename: N
authors.initials: N
authors.lastname: Sharma
authors.forename: K M
authors.initials: KM
authors.lastname: Hedger
mesh_terms: D000328:Adult; D002245:Carbon Dioxide / Q000032:analysis; D003027:Cluster Headache / Q000150:complications* / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D010092:Oximetry; D017286:Polysomnography; D011659:Pulmonary Gas Exchange; D012891:Sleep Apnea Syndromes / Q000150:complications* / Q000175:diagnosis*
chemical_list: D002245:Carbon Dioxide