title: Papilledema and obstructive sleep apnea syndrome.
abstract: OBJECTIVE
  To characterize the pathogenesis and clinical features of optic disc edema associated with obstructive sleep apnea syndrome (SAS).
  
  
  METHODS
  A series of 4 patients with SAS and papilledema (PE) underwent complete neuro-ophthalmologic evaluation and lumbar puncture. In 1 patient, continuous 24-hour intracranial pressure (ICP) monitoring was also performed.
  
  
  RESULTS
  All 4 patients had bilateral PE that was asymmetric in 2. Three patients had optic nerve dysfunction, asymmetric in 1, unilateral in 2. Daytime cerebrospinal fluid pressure measurements were within normal range. Nocturnal monitoring performed in one patient, however, demonstrated repeated episodes of marked ICP elevation associated with apnea and arterial oxygen desaturation.
  
  
  CONCLUSIONS
  We propose that PE in SAS is due to episodic nocturnal hypoxemia and hypercarbia resulting in increased ICP secondary to cerebral vasodilation. In these individuals, intermittent ICP elevation is sufficient to cause persistent disc edema. These patients may be at increased risk for developing visual loss secondary to PE compared with patients with obesity-related pseudotumor cerebri because of associated hypoxemia. The diagnosis of SAS PE may not be appreciated because daytime cerebrospinal fluid pressure measurements are normal and because patients tend to present with visual loss rather than with symptoms of increased ICP.
authors: Midwest Eye Institute, 201 Pennsylvania Pkwy, Indianapolis, IN 46280, USA. vpurvin@iupui.edu
authors: V A
authors: VA
authors: Purvin
authors: A
authors: A
authors: Kawasaki
authors: R D
authors: RD
authors: Yee
mesh_terms: D000086:Acetazolamide / Q000627:therapeutic use; D000328:Adult; D002257:Carbonic Anhydrase Inhibitors / Q000627:therapeutic use; D015170:Cerebrospinal Fluid Pressure; D005654:Fundus Oculi; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010211:Papilledema / Q000150:complications* / Q000175:diagnosis / Q000188:drug therapy; D020181:Sleep Apnea, Obstructive / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014139:Tracheostomy; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields
chemical_list: D002257:Carbonic Anhydrase Inhibitors; D000086:Acetazolamide