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Glucose tolerance and insulin secretion in spontaneously hyperthyroid cats
M Hoenig1, M E Peterson, D C Ferguson
1Department of Physiology and Pharmacology and Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens 30602.
Research in Veterinary Science
|November 1, 1992
Summary
Hyperthyroidism in cats impairs glucose tolerance and insulin secretion. These metabolic changes may persist even after treatment, indicating long-lasting effects on feline endocrine health.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Metabolic Research
Background:
- Hyperthyroidism is a common endocrine disorder in cats.
- It is associated with increased metabolic rate and can affect glucose metabolism.
- The long-term impact of hyperthyroidism on glucose tolerance and insulin secretion in cats is not fully understood.
Purpose of the Study:
- To investigate glucose tolerance and insulin secretion in cats with spontaneous hyperthyroidism.
- To assess the effects of hyperthyroidism treatment on these metabolic parameters.
- To determine if alterations in glucose metabolism are reversible after treatment.
Main Methods:
- Glucose tolerance tests were performed on clinically normal cats and hyperthyroid cats.
- Insulin secretion was measured in response to a glucose load.
- Hyperthyroid cats underwent repeat testing after treatment with radioactive iodine (131I).
Main Results:
- Hyperthyroid cats exhibited decreased glucose clearance compared to normal cats.
- Glucose clearance worsened in hyperthyroid cats post-treatment.
- Both basal and glucose-stimulated insulin secretion were significantly increased in hyperthyroid cats and did not improve after treatment.
Conclusions:
- Spontaneous hyperthyroidism in cats can cause persistent alterations in glucose tolerance.
- Insulin secretion abnormalities associated with hyperthyroidism may not be reversed by treatment.
- These findings suggest long-lasting metabolic consequences of hyperthyroidism in feline patients.