Cochlear changes in presbycusis with tinnitus.
OBJECTIVE
The pathophysiology of tinnitus is obscure and its treatment is therefore elusive. Significant progress in this field can only be achieved by determining the mechanisms of tinnitus generation, and thus, histopathologic findings of the cochlea in presbycusis with tinnitus become crucial. We revealed the histopathologic findings of the cochlea in subjects with presbycusis and tinnitus.


METHODS
The subjects were divided into 2 groups, presbycusis with tinnitus (tinnitus) group and presbycusis without tinnitus (control) group, with each group comprising 8 temporal bones from 8 subjects. We quantitatively analyzed the number of spiral ganglion cells, loss of cochlear inner and outer hair cells, and areas of the stria vascularis and spiral ligament.


RESULTS
There was a significantly greater loss of outer hair cells in the tinnitus group compared with the control group in the basal and upper middle turns. The stria vascularis was more atrophic in the tinnitus group compared with the control group in the basal turn.


CONCLUSIONS
Tinnitus is more common in patients with presbycusis who have more severe degeneration of outer hair cells and stria vascularis.
Terao
Kyoichi
K
Department of Otolaryngology, University of Minnesota, Minneapolis, MN55455, USA.
Cureoglu
Sebahattin
S
Schachern
Patricia A
PA
Morita
Norimasa
N
Nomiya
Shigenobu
S
Deroee
Armin F
AF
Doi
Katsumi
K
Mori
Kazunori
K
Murata
Kiyotaka
K
Paparella
Michael M
MM
D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001299:Audiometry; D001707:Biopsy, Needle; D016022:Case-Control Studies; D003051:Cochlea / Q000473:pathology / Q000503:physiopathology*; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D006198:Hair Cells, Auditory / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011304:Presbycusis / Q000175:diagnosis / Q000453:epidemiology / Q000473:pathology*; D011379:Prognosis; D012016:Reference Values; D018570:Risk Assessment; D013136:Spiral Ganglion / Q000473:pathology* / Q000503:physiopathology; D018709:Statistics, Nonparametric; D013316:Stria Vascularis / Q000473:pathology; D014012:Tinnitus / Q000175:diagnosis / Q000453:epidemiology / Q000473:pathology*