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Nutritional secondary hyperparathyroidism in six cats.
1Clinic for Small Animal Internal Medicine, University of Zürich, Switzerland.
The Journal of Small Animal Practice
|January 29, 2000
Summary
Nutritional secondary hyperparathyroidism (NSH) in cats causes bone weakness and fractures due to low calcium and vitamin D. Early diagnosis and dietary correction are crucial for recovery, though severe cases may be fatal.
Area of Science:
- Veterinary Medicine
- Comparative Pathology
- Nutritional Science
Background:
- Nutritional secondary hyperparathyroidism (NSH) is a metabolic bone disease.
- It arises from dietary imbalances, particularly calcium and phosphorus ratios, and vitamin D deficiency.
- NSH can lead to significant skeletal and neurological complications in affected animals.
Observation:
- Six cats diagnosed with NSH over three years presented with severe osteopenia and hypocalcemia.
- Clinical signs included spontaneous fractures (long bones, scapulae, pelvis, spine) and neurological issues like seizures.
- Laboratory findings revealed elevated parathormone, mildly elevated 1,25(OH)2-vitamin D3, and decreased 25(OH)-vitamin D3.
Findings:
- Markedly elevated serum parathormone levels were characteristic of NSH.
- Vitamin D metabolite levels showed specific alterations: 1,25(OH)2-vitamin D3 mildly elevated, 25(OH)-vitamin D3 mildly decreased.
- Treatment with calcium gluconate, balanced diet, and rest led to recovery in 75% of cases.
Implications:
- Despite the availability of balanced commercial diets, NSH remains a relevant clinical concern in growing cats.
- Consideration of NSH is vital for cats presenting with spontaneous fractures or seizures.
- Prompt diagnosis and appropriate nutritional management are key to successful NSH treatment and preventing severe outcomes.