title: The effect of nasal continuous positive airway pressure on normal ears and on ears with atelectasis.
abstract: OBJECTIVE
  The effect of short-term nasal continuous positive airway pressure (CPAP) on normal and atelectatic ears was studied to investigate the effect of positive pressure on these ears.
  
  
  METHODS
  This is a prospective study performed at the ear, nose, and throat clinic of a district general hospital. No randomization was designed for this study.
  
  
  METHODS
  The study on the normal ears was performed on healthy volunteers, whereas the study on atelectatic ears was performed on patients who had difficulty in performing the Valsalva maneuver.
  
  
  METHODS
  Tympanometry, audiometry, and electronystagmography were performed on normal subjects before, during, and immediately after a single use of nasal CPAP. In the group of atelectatic ears, otoscopy and audiometry were performed before and immediately after the use of nasal CPAP (3 hours).
  
  
  METHODS
  The change in the middle ear pressure and hearing on the normal ears during the use of nasal CPAP was measured. In the group with atelectatic ears, the incidence of reinflation of the collapsed eardrum after the use of nasal CPAP was measured.
  
  
  RESULTS
  Positive pressure was recorded in all the middle ears during the use of nasal CPAP, resulting in a reversible hearing impairment. More than two thirds of the atelectatic eardrums could be reinflated by a single use of nasal CPAP.
  
  
  CONCLUSIONS
  Nasal CPAP could be used to deliver positive pressure into the middle ear and, hence, could be used as a device to reinflate a collapsed eardrum in many atelectatic ears.
authors.affiliation: Ipswich Hospital NHS Trust, Suffolk, England.
authors.forename: M W
authors.initials: MW
authors.lastname: Yung
mesh_terms: D000158:Acoustic Impedance Tests; D001299:Audiometry; D001309:Auditory Threshold; D001469:Barotrauma / Q000209:etiology*; D004432:Ear, Middle / Q000293:injuries*; D004584:Electronystagmography; D006311:Hearing Disorders / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D010034:Otitis Media with Effusion / Q000628:therapy*; D011175:Positive-Pressure Respiration / Q000009:adverse effects* / Q000379:methods*; D011446:Prospective Studies; D014432:Tympanic Membrane; D014433:Tympanoplasty