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The effects of hypothyroidism on the ears of cats and squirrel monkeys: A pilot study

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.