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Cardiac changes in experimental hyperthyroidism in dogs.

A Hoey1, A Page, L Brown

  • 1Department of Physiology and Pharmacology, University of Queensland.

Australian Veterinary Journal
|November 1, 1991
PubMed
Summary
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Triiodothyronine (T3) injections induced hyperthyroidism in dogs, causing increased heart rate and coronary artery smooth muscle hypertrophy. Unlike other species, no ventricular hypertrophy was observed, but reduced myocardial perfusion is a concern.

Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Cardiology

Background:

  • Triiodothyronine (T3) is a key thyroid hormone regulating metabolism.
  • Hyperthyroidism can affect cardiovascular function.
  • Previous studies in humans, cats, and rats show ventricular hypertrophy with T3 administration.

Purpose of the Study:

  • To investigate the cardiovascular effects of induced hyperthyroidism in healthy dogs.
  • To compare canine responses to T3 with those reported in other species.

Main Methods:

  • 10 healthy dogs received daily subcutaneous injections of triiodothyronine (T3) at 1 mg/kg for 14 days.
  • Clinical signs, serum T3 concentrations, and electrolyte levels were monitored.
  • Electrocardiography (ECG) and echocardiography were performed to assess cardiac function and structure.

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Main Results:

  • Induced hyperthyroidism was confirmed by high serum T3 levels and clinical signs (hypokalaemia, hyperactivity, weight loss, diarrhoea, thirst).
  • ECG showed increased heart rate (63 +/- 11 bpm) and T wave amplitude.
  • Echocardiography revealed no changes in fractional shortening or ventricular hypertrophy, but marked coronary artery smooth muscle hypertrophy was noted.

Conclusions:

  • Canine hyperthyroidism induced by T3 differs from other species, notably lacking ventricular hypertrophy.
  • Coronary artery smooth muscle hypertrophy may impair myocardial perfusion despite preserved cardiac output.
  • Further research is needed to understand the long-term implications of these findings in dogs.