title: Relation between middle ear pressure changes and postoperative nausea and vomiting in pediatric strabismus surgery.
abstract: OBJECTIVE
  To investigate the effects of tympanometric changes on the frequency of postoperative nausea and vomiting (PONV).
  
  
  METHODS
  Prospective, observational study.
  
  
  METHODS
  University hospital.
  
  
  METHODS
  49 ASA physical status I, nonpremedicated children undergoing elective strabismus surgery.
  
  
  METHODS
  Frequency of PONV was assessed at various time intervals (0-2, 2-6, and 6-24 hours) with a 4-point scale (0, no nausea; 1, nausea but no vomiting; 2, one episode of vomiting; 3, two or more episodes of vomiting), and correlation with tympanometric data was investigated.
  
  
  METHODS
  Tympanogram was obtained before induction of standardized anesthesia and after full recovery. Fourteen (28.6%) patients had nausea, and 10 (20.4%) patients vomited. The tympanic gradient, compliance, and pressure values were found to be significantly higher in postoperative measurements than their preoperative counterparts (P < 0.05). The volumes of both ears increased postoperatively, but these differences were not statistically significant (P > 0.05). Changes in middle ear pressure, volume, compliance, and gradient did not correlate with PONV (P > 0.05).
  
  
  CONCLUSIONS
  Gradient, compliance, volume, and pressure changes in middle ears were not found to be related to the frequency of nausea and vomiting after strabismus surgery.
authors: Department of Anesthesiology, Izzet Baysal Medical Faculty, Abant Izzet Baysal University, Bolu 14280, Turkey. drkaraaslan@hotmail.com
authors: Kazim
authors: K
authors: Karaaslan
authors: Hasan
authors: H
authors: Kocoglu
authors: Fahrettin
authors: F
authors: Yilmaz
authors: Serap
authors: S
authors: Koybasi
authors: Serdal
authors: S
authors: Celebi
authors: Hasan
authors: H
authors: Ekerbicer
mesh_terms: D000158:Acoustic Impedance Tests / Q000379:methods*; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004432:Ear, Middle / Q000503:physiopathology*; D017558:Elective Surgical Procedures / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D020250:Postoperative Nausea and Vomiting / Q000209:etiology*; D011312:Pressure; D011446:Prospective Studies; D013285:Strabismus / Q000601:surgery*; D013997:Time Factors