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Exercise-induced hyperkalemia in hypothyroid dogs.

I A Schaafsma1, M G van Emst, H S Kooistra

  • 1Department of Veterinary Anatomy and Physiology, Faculty of Veterinary Medicine, Utrecht University, The Netherlands.

Domestic Animal Endocrinology
|March 20, 2002
PubMed
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Hypothyroidism in dogs significantly reduces skeletal muscle sodium-potassium pump (Na+, K+-ATPase) activity. This leads to higher resting potassium levels and dangerous hyperkalemia during exercise in hypothyroid dogs.

Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Exercise Physiology

Background:

  • Hypothyroidism is a common endocrine disorder in dogs.
  • Skeletal muscle Na+, K+-ATPase plays a crucial role in potassium homeostasis.
  • The impact of hypothyroidism on muscle Na+, K+-ATPase and exercise-induced potassium changes in dogs is not well understood.

Purpose of the Study:

  • To investigate the effect of hypothyroidism on skeletal muscle Na+, K+-ATPase concentration in dogs.
  • To examine potassium (K+) homeostasis at rest and during exercise in hypothyroid dogs.

Main Methods:

  • Quantified Na+, K+-ATPase concentration using [3H]ouabain binding in sternothyroid muscle biopsies from Beagle dogs before and after induced hypothyroidism.
  • Measured plasma K+ concentrations at rest and during treadmill exercise in hypothyroid and euthyroid Beagle dogs.

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Main Results:

  • Hypothyroidism resulted in a 41% decrease in muscle Na+, K+-ATPase concentration.
  • Hypothyroid dogs exhibited significantly higher resting plasma K+ (14%) compared to euthyroid dogs.
  • Plasma K+ increased significantly during exercise in hypothyroid dogs, but not in euthyroid dogs.

Conclusions:

  • Hypothyroid dogs are prone to exercise-induced hyperkalemia.
  • Reduced skeletal muscle Na+, K+-ATPase capacity is a primary factor contributing to hyperkalemia in hypothyroid dogs during exercise.