Equis ISSN 2398-2977

Anhidrosis

Contributor(s): Graham Munroe

Introduction

  • Inappropriate or no sweating in hot climates.
  • Cause: unknown, possibilities include: hypothyroidism, hypochloremia, exhausted sweat glands and increased blood epinephrine levels.
  • Horses moved from cold to hot humid climates, in vigorous exercise, cease to sweat at onset of exercise.
  • Signs: high rectal temperatures and respiratory rates with decreased sweating and chronic coat changes.
  • Diagnosis: intradermal epinephrine sweating test.
  • Treatment: move horse to cooler climate, decrease exercise, medical or nutritional supplements.

Pathogenesis

Etiology

  • Possible causes include:
  • Hypothyroidism .
  • Hypochloremia.
  • Increased blood epinephrine concentrations.
  • Exhaustion of sweat glands.

Predisposing factors

General
  • Horses moved from a cold or temperate climate to a hot humid one.
  • Horses in vigorous exercise.

Pathophysiology

  • Inappropriate or no sweating in hot climates.
  • Cause unknown.
  • Decreased ability of sweat glands to respond to epinephrine.
  • Atrophy of sweat glands.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Geor R J et al (1998) Thermoregulatory adaptations associated with training and heat acclimatisation. Vet Clin North Am Equine Pract 14 (1), 97-120 PubMed.
  • Guthrie A J et al (1992) Use of a semi-quantitative sweat test in Thoroughbred horses. J S Afr Vet Assoc 63 (4), 162-165 PubMed.
  • Jenkinson D M et al (1989) Effects of season and lower ambient temperature on the structure of the sweat glands in anhidrotic horses. Equine Vet J 21 (1), 59-65 PubMed.
  • Mayhew I G et al (1987) Clinical, clinicopathologic, and epidemiologic features of anhidrosis in central Florida Thoroughbred horses. J Vet Intern Med (3), 136-141 PubMed.
  • Jenkinson D M et al (1985) Ultrastructural variations in the sweat glands of anhidrotic horses. Equine Vet J 17 (4), 287-291 PubMed.
  • Thomsett L R (1984) Non-infectious skin diseases of horse. Vet Clin North Am Large Anim Pract (1), 59-78 VetMedResource.
  • Warner A et al (1983) Equine anhidrosis - a review of pathophysiologic mechanisms. Vet Res Commun (4), 249-264 PubMed.
  • Beadle R E et al (1982) Summertime plasma catecholamine concentrations in healthy and anhidrotic horses in Louisiana. Am J Vet Res 43 (8), 1446-1448 VetMedResource.
  • Warner A E et al (1982) Equine anhidrosis - a survey of affected horses in Florida. JAVMA 180 (6), 627-629 VetMedResource.
  • Peter J E et al (1981) Anhidrosis in a Thoroughbred. Vet Med Small Anim Clin 76 (5), 730-732 VetMedResource.


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