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Pathological changes in the myocardium of hypocalcaemic parturient cows
  1. N. Yamagishi, DVM1,1,
  2. K. Ogawa, DVM, PhD2 and
  3. Y. Naito, DVM, PhD1
  1. 1 Department of Veterinary Internal Medicine
  2. 2 Department of Veterinary Anatomy, Faculty of Agriculture, Iwate University, Morioka, Iwate 020, Japan

Abstract

Three parturient cows in lateral recumbency which were moaning and had tachycardia, arrhythmia and dyspnoea were thoroughly examined. They were hypocalcaemic (0.70-1.27 mmol/litre) and were euthanased within four days, because they failed to respond to calcium treatment. By light microscopy the most characteristic pathological changes in the heart were necrotic changes scattered throughout the myocardium. Electron microscopy revealed abnormalities in the myocytes which were characterised by focal myofibrillar lysis, irregular splitting, streaming and spreading of the Z band and myofibrillar disarray.

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