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The effects of hypothyroidism on the ears of cats and squirrel monkeys: A pilot study
Author(s) -
Withers Ben T.,
Reuter S. Harold,
Janeke Johan B.
Publication year - 1972
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-197205000-00003
Subject(s) - hypoactivity , cats , thyroid , ablation , medicine , hormone , endocrinology , anatomy
Eleven animals (five cats and six squirrel monkeys) were studied before and after being rendered hypothyroid by, surgical excision or radioactive ablation of the thyroid gland. Blood chemistry studies, before ablation and after, proved the presence of hypothyroid state. Audiometric studies by the behaviorally trained avoidance technique and electronystagmograms indicated hypoactivity regarding hearing and labyrinthine function. In one cat given thyroid hormone to full compensation level, the high frequency hearing loss returned to normal. Studies of temporal bone specimens of the five cats: hypothyroid, thyroid compensated, and control, microscopically showed no morphological alterations. Presumably functional changes were due to biochemical involvement which failed to show as a morphological one.