title: High frequency tympanometry findings in neonates: does it depend on head position?
abstract: OBJECTIVE
  The purpose of this study was to investigate the effect of head positions on high frequency tympanometry (HFT) results obtained from neonates.
  
  
  METHODS
  A cross-sectional study to compare HFT results obtained from neonates in two head positions (face sideways and face up).
  
  
  METHODS
  One hundred and fifty-seven neonates (80 female, 77 male; mean age = 48.3 ± 26.7 hours) participated.
  
  
  RESULTS
  The mean uncompensated admittance at 200 daPa obtained in the face sideways position was significantly greater than that obtained in the face up position (1.02 versus 0.96 mmho). A significant ear effect for baseline compensated admittance was found (right/left = 0.64/0.53 mmho). However, there were no significant main effects for head positions for the tympanometric peak pressure, baseline compensated static admittance, and component compensated static admittance measures, indicating that these measures are resilient to head positions.
  
  
  CONCLUSIONS
  These findings support the use of HFT normative values regardless of the two head positions investigated in the present study.
authors.affiliation: Hearing Research Unit for Children, School of Health and Rehabilitation Sciences, The University of Queensland, St. Lucia, Australia. k.kei@uq.edu.au
authors.forename: Joseph
authors.initials: J
authors.lastname: Kei
authors.forename: Rafidah
authors.initials: R
authors.lastname: Mazlan
authors.forename: Se Chall
authors.initials: SC
authors.lastname: Kim
authors.forename: Jonathan
authors.initials: J
authors.lastname: Pont
authors.forename: Sally-Ann
authors.initials: SA
authors.lastname: Schilt
authors.forename: Roneet
authors.initials: R
authors.lastname: Sewak
authors.forename: Vaughn
authors.initials: V
authors.lastname: Shelton
authors.forename: Derek
authors.initials: D
authors.lastname: Sutherland
mesh_terms: D000158:Acoustic Impedance Tests; D000161:Acoustic Stimulation; D000704:Analysis of Variance; D001306:Auditory Pathways / Q000502:physiology*; D003430:Cross-Sectional Studies; D005260:Female; D006257:Head; D006309:Hearing; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D017084:Otoacoustic Emissions, Spontaneous; D056888:Patient Positioning; D011187:Posture; D011237:Predictive Value of Tests; D011312:Pressure; D016683:Supine Position