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Does systemic steroid deficiency affect inner ear functions?

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Corticosteroid deficiency in rats did not affect DPOAE hearing function but increased ABR thresholds. Cortisone replacement therapy can reverse these hearing function changes.

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Area of Science:

  • Oto-rhino-laryngology
  • Endocrinology
  • Neuroscience

Background:

  • Corticosteroids are widely used to treat inner ear disorders.
  • The impact of systemic steroid deficiency on hearing function requires further investigation.

Purpose of the Study:

  • To investigate the effects of systemic corticosteroid deficiency on hearing functions.
  • To determine if hearing function changes due to steroid deficiency can be reversed with corticosteroid replacement.

Main Methods:

  • Twenty-four healthy female rats were divided into three groups: medical adrenalectomy, medical adrenalectomy with dexamethasone treatment, and a control group.
  • Audiological evaluations, including Distortion-Product Otoacoustic Emissions (DPOAE) and Auditory Brainstem Response (ABR) thresholds, were performed.
  • Blood samples were analyzed to determine corticosterone levels.

Main Results:

  • Cessation of cortisol secretion led to progressive increases in ABR thresholds but did not significantly alter DPOAE values.
  • In rats with adrenalectomy, ABR thresholds increased significantly on days 7 and 14, returning to basal levels by day 21 with dexamethasone treatment.
  • No significant differences were observed in DPOAE values across all groups and time points.

Conclusions:

  • Systemic corticosteroid deficiency primarily affects auditory nerve function, as indicated by increased ABR thresholds.
  • DPOAE values remain unaffected, suggesting the outer hair cell function is preserved.
  • Cortisone replacement therapy can successfully restore auditory nerve function impaired by corticosteroid deficiency.