title: Effect of mastoid drilling on the distortion product otoacoustic emissions in the non operated ear.
abstract: OBJECTIVE
  To monitor the effect of mastoid drilling on the non-operated ear distortion product otoacoustic emissions.
  
  
  METHODS
  Distortion product otoacoustic emissions (DPOAEs) were measured at frequencies of f 2=2, 3, 4 and 5 kHz, and a frequency ratio f 1 /f 2=1.22. DPOAEs were measured in 49 cases, pre and post-operatively who underwent mastoid drilling procedures, compared with each other and with 49 controls who underwent myringoplasty and myringotomy procedures.
  
  
  RESULTS
  Amplitudes of DPOAEs decreased significantly in those who underwent mastoidectomies over all the measured frequencies in the immediate post-operative period but had recovered by the seventh post operative day.
  
  
  CONCLUSIONS
  Drill induced noise can cause temporary decrease in the DPOAEs postoperatively and hence temporary hearing loss for a period of one week.
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India. Electronic address: drvijendras@gmail.com.
authors.forename: Vijendra S
authors.initials: VS
authors.lastname: Shenoy
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India.
authors.forename: Siddharth
authors.initials: S
authors.lastname: Vanka
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India.
authors.forename: Raghavendra A
authors.initials: RA
authors.lastname: Rao
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India.
authors.forename: Vishnu
authors.initials: V
authors.lastname: Prasad
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India.
authors.forename: Panduranga M
authors.initials: PM
authors.lastname: Kamath
authors.affiliation: Dept of ENT and Head & neck surgery, Kasturba Medical College, Manipal University, Mangalore, India.
authors.forename: Jayashree
authors.initials: J
authors.lastname: Bhat
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006317:Hearing Loss, Noise-Induced / Q000209:etiology*; D006801:Humans; D008297:Male; D008416:Mastoid / Q000601:surgery*; D010027:Osteotomy / Q000379:methods; D017084:Otoacoustic Emissions, Spontaneous; D011183:Postoperative Complications / Q000209:etiology*; D011446:Prospective Studies; D013525:Surgical Instruments / Q000009:adverse effects*; D014732:Vibration / Q000009:adverse effects