Basic Research in Cardiology

, Volume 81, Issue 6, pp 636–645 | Cite as

Acute myocardial ischaemia in the anaesthetised pig: local catecholamine release and its relation to ventricular fibrillation

  • F. M. McDonald
  • H. Knopf
  • S. Hartono
  • W. Polwin
  • A. Bischoff
  • Hj. Hirche
  • K. Addicks
Original Contributions


In anaesthetised open-chest pigs, sequential myocardial samples were obtained before and after occlusion of the distal half of the LAD. These samples were analysed histofluorimetrically to determine the density of catecholamine containing neurones in each sample (quantified morphometrically), and radioenzymatically for total tissue noradrenaline content. Following coronary artery occlusion, 75% of the animals (24 out of 32) died in ventricular fibrillation in the first 30 min, the other 25% (8/32) survived the first 60 min of myocardial ischaemia. Coronary artery occlusion led to a significant reduction in the density of fluorescing fibres in the ischaemic myocardium of animals which fibrillated (from 1.25±0.2% to 0.67±0.10% at 15 min) whereas in the survivors there was no significant change in fluorescing area during the course of the experiment. Animals which fibrillated had a significant reduction in tissue noradrenaline concentration of the ischaemic myocardium (from an initial concentration of 612±72 to 402±64 ng/g ww) within the first 5 min of ischaemia. It is concluded that in this model of myocardial ischaemia, the development of ventricular fibrillation in the early phase seems to be related to the release of noradrenaline from the sympathetic neurones after the onset of myocardial ischaemia.

Key words

pig myocardial ischaemia catecholamines ventricular fibrillation 


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Copyright information

© Dr. Dietrich Steinkopff Verlag 1986

Authors and Affiliations

  • F. M. McDonald
    • 1
  • H. Knopf
    • 1
  • S. Hartono
    • 1
  • W. Polwin
    • 1
  • A. Bischoff
    • 1
  • Hj. Hirche
    • 1
  • K. Addicks
    • 2
  1. 1.Department of Applied PhysiologyUniversity of CologneFRG
  2. 2.Department of AnatomyUniversity of CologneFRG

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