title: Clinical and financial audit of diagnostic protocols for lesions of the cerebellopontine angle.
abstract: OBJECTIVE
  To assess the diagnostic efficiency and costs of protocols used for investigating patients with suspected lesions of the cerebellopontine angle.
  
  
  METHODS
  Prospective evaluation of tests of auditory brain stem responses and acoustic reflex thresholds, electronystagmography, and calorics. Positive test results were confirmed or refuted by high resolution computed tomography with intravenous enhancement.
  
  
  METHODS
  Single general otolaryngology clinic in a teaching hospital.
  
  
  METHODS
  270 consecutive patients with sensorineural hearing loss requiring investigation to exclude a lesion of the cerebellopontine angle.
  
  
  METHODS
  Estimated costs of various diagnostic protocols and performance in detecting tumours of the cerebellopontine angle.
  
  
  RESULTS
  Protocols including tests of auditory brain stem responses and acoustic reflex thresholds as sifting tests before computed tomography were clinically acceptable and presented considerable savings over the use of computed tomography in all patients (74,000 pounds or 84,000 pounds v 122,000 pounds). The use of electronystagmography and calorics could not be justified on clinical or financial grounds.
  
  
  CONCLUSIONS
  Audiological tests of auditory brain stem responses and acoustic reflex thresholds followed by computed tomography constitute the most cost effective protocol for determining suspected lesions of the cerebellopontine angle.
  
  
  CONCLUSIONS
  The cost effectiveness of diagnostic protocols should be evaluated throughout the health service.
authors.affiliation: Royal Infirmary, Glasgow.
authors.forename: I R
authors.initials: IR
authors.lastname: Swan
authors.forename: S
authors.initials: S
authors.lastname: Gatehouse
mesh_terms: D002150:Caloric Tests; D002528:Cerebellar Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002530:Cerebellopontine Angle; D002985:Clinical Protocols / Q000592:standards*; D003362:Cost-Benefit Analysis; D004584:Electronystagmography / Q000191:economics; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology; D005375:Financial Audit; D006319:Hearing Loss, Sensorineural / Q000209:etiology; D006801:Humans; D008485:Medical Audit; D011446:Prospective Studies; D012022:Reflex, Acoustic / Q000502:physiology; D014057:Tomography, X-Ray Computed / Q000191:economics