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Evaluation of ionized and total serum magnesium concentrations in hyperthyroid cats.
Cornelia V Gilroy1, Barbara S Horney, Shelley A Burton
1Department of Pathology and Microbiology, Atlantic Veterinary College, Charlottetown, Prince Edward Island C1A 4P3. CGilroy@upei.ca
Summary
Hyperthyroidism in cats may alter magnesium levels, specifically the ratio of ionized to total serum magnesium. Increased thyroxine (T4) concentrations correlate with decreased ionized magnesium, suggesting severity impacts this balance.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Clinical Biochemistry
Background:
- Hyperthyroidism is known to increase renal magnesium excretion, potentially leading to hypomagnesemia.
- Understanding magnesium homeostasis in hyperthyroid cats is crucial for diagnosis and management.
Purpose of the Study:
- To investigate serum magnesium concentrations (total and ionized) in hyperthyroid cats compared to healthy controls.
- To explore the relationship between thyroxine (T4) levels and magnesium status in feline hyperthyroidism.
Main Methods:
- Analysis of anaerobically collected blood samples from 15 hyperthyroid and 40 healthy cats.
- Utilized ion-selective electrode and serum biochemical analyzers for magnesium and total T4 measurements.
Main Results:
- No significant difference in total or ionized serum magnesium between groups.
- A significant difference in the ionized to total magnesium ratio was observed in hyperthyroid cats with elevated T4.
- A negative correlation was found between ionized magnesium and T4 concentrations in hyperthyroid cats.
Conclusions:
- The ratio of ionized to total serum magnesium may be a more sensitive indicator of magnesium status in hyperthyroid cats than absolute concentrations.
- The severity of hyperthyroidism, indicated by T4 levels, appears to negatively influence ionized magnesium concentration.