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The ultrastructural effects of global ischaemia on Purkinje fibres compared with working myocardium: A qualitative and morphometric investigation on the canine heart

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Summary

During open heart surgery, reperfusion-induced arrhythmias arising after short periods of ischaemia may originate from subendocardial Purkinje fibres. We investigated the ultrastructure of these fibres during 30 min of global ischaemia at 25° C. The effects both with myocardial protection (HTK cardioplegia) and without it (pure ischaemia) were compared qualitatively and morphometrically. After 30 min pure ischaemia overcontraction of sarcomeres, hypercontraction and contraction bands, together with considerable changes in organelles, predominate over cellular oedema. In Purkinje fibres, both cellular and mitochondrial swelling were significantly increased within this 30-min time period from the onset of pure ischaemia. In contrast, following HTK cardioplegia and 30 min ischaemia, cellular and mitochondrial swelling remain moderate and over-contractions are almost entirely lacking. This means that despite remarkable differences between pure ischaemia and HTK cardioplegia in the degree of protection attained it is clear that, compared with the working myocardium, subendocardial Purkinje fibres do not display a higher resistance to early global ischaemia. Further investigations of this sensitivity of Purkinje fibres to global ischaemia and certain drugs may bring about new insights into myocardial protection and pharmacotherapy of arrhythmias.

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Authors and Affiliations

  1. Abteilung Vegetative Physiologie und Pathophysiologie, Zentrum Physiologie und Pathophysiologie, Deutschland

    P. A. Schnabel, A. Schmiedl, B. Ramsauer, U. Bartels, M. M. Gebhard & H. J. Bretschneider

  2. Abteilung Elektronenmikroskopie, Zentrum Anatomie, Universität Göttingen, Göttingen, Federal Republic of Germany

    J. Richter

  3. Pathologisches Institut, Universität Heidelberg, Heidelberg, Federal Republic of Germany

    G. Mall

Authors
  1. P. A. Schnabel
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  2. J. Richter
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  3. A. Schmiedl
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  4. B. Ramsauer
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  5. U. Bartels
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  6. M. M. Gebhard
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  7. G. Mall
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  8. H. J. Bretschneider
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Schnabel, P.A., Richter, J., Schmiedl, A. et al. The ultrastructural effects of global ischaemia on Purkinje fibres compared with working myocardium: A qualitative and morphometric investigation on the canine heart. Vichows Archiv A Pathol Anat 418, 17–25 (1991). https://doi.org/10.1007/BF01600240

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  • DOI: https://doi.org/10.1007/BF01600240

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