Paroxysmal dyskinesia might develop as a consequence of HT in cats, with improvement or cessation of the episodes once normal thyroid function is restored.

Animals

Seven client-owned cats.

Methods

Multicenter retrospective observational study comprising cats with clinical signs consistent with the clinical phenotype of paroxysmal dyskinesia based on video recordings, and a concurrent diagnosis of HT. Follow-up information was obtained by contacting referring veterinarians and owners.

Results

Seven cats were included. No signs of neurological disease were observed between the episodes except for plantigradism in one cat. Brain MRI studies were performed in 2 cats, revealing no intracranial abnormalities. In 1 cat, a 2-h video-assisted wireless electroencephalography confirmed the absence of epileptic activity. Clinical signs associated with HT were noted in all but 1 cat. After treatment for HT, complete remission of paroxysmal dyskinesia episodes was achieved in all cases, with euthyroid state confirmed in 6 cats.

Conclusions and clinical importance

HT should be considered a differential diagnosis in cats with paroxysmal dyskinesia, even in the absence of other suggestive signs. Similar to the analogous disorder in humans, the prognosis appears excellent once appropriate treatment for HT is initiated.

Amy Lam

Paroxysmal dyskinesia in cats… it can be associated with hyperthyroidism!

Paroxysmal dyskinesia associated with hyperthyroidism in 7 cats: a novel manifestation of a metabolic encephalopathy Open Access

Abstract

Are you using thiamazole to treat hyperthyroidism? What dose do you use?