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Significance of cardiac innervation on spontaneous ventricular arrhythmias elicited by left stellate ganglion stimulation in dogs 4 days after myocardial infarction: Comparison of two experimental models

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Summary

The effects of cardiac sympathetic overactivity on spontaneous arrhythmias and transmural left ventricular effective refractory period (LVERP) were assessed by left stellate stimulation (LSS) in 16 anesthetized dogs. The experiments were performed 4 days after proximal occlusion of the left anterior descending (LAD) coronary artery produced by either ligation (9 dogs) or embolization with histoacryl (7 dogs). The innervation of left ventricular myocardium was studied by light and electron microscopies. Synaptophysin (SYN)- and neuropeptide Y (NPY)- immunoreactive nerve fibers and terminals were thereby detected. In dogs subjected to ligation, LSS elicited negligible arrhythmias in spite of a decrease in LVERP by 6.9±2.2% (mean±SD, p<0.001). However, dogs with intravascular occlusion were more susceptible to LSS, as indicated by development of sustained ventricular rhythms. In these animals, the LVERP decreased with LSS by 14.6±3.4% (p<0.001). The innervation of the enterior left ventricular wall distal to the place of occlusion revealed a higher reduction of SYN- and NPY-immunoreactive nerves in infarcted myocardium and a more heterogeneous distribution of nerves in undamaged regions after ligation compared to intravascular occlusion. Ultrastructurally, nerve terminals containing small agranular and large dense-core vesicles were found innervating ischemically damaged myocardiocytes. Our findings indicate a higher preservation of nerves in infarcted and noninfarcted myocardium of animals subjected to embolic occlusion of the LAD. Because LSS apparently elicited more arrhythmias in these animals, we suggested a proarrhythmic effect of intact myocardial innervation after infarction.

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Authors and Affiliations

  1. Departments of Cardiology, and Anatomy and Cell Biology at the University of Heidelberg, Germany

    I. Aidonidis, J. Metz, F. Gerstheimer, W. Kübler & J. Brachmann

  2. Abt. Innere Medizin III (Kardiologie), Medizinische Universitatsklinik, Bergheimer Str. 58, D-6900, Heidelberg, Germany

    J. Brachmann

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  1. I. Aidonidis
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  2. J. Metz
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  3. F. Gerstheimer
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  4. W. Kübler
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  5. J. Brachmann
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Supported by the Deutsche Forschungsgemeinschaft within the SFB 320 “Herzfunktion und ihre Regulation”.

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Aidonidis, I., Metz, J., Gerstheimer, F. et al. Significance of cardiac innervation on spontaneous ventricular arrhythmias elicited by left stellate ganglion stimulation in dogs 4 days after myocardial infarction: Comparison of two experimental models. Basic Res Cardiol 88, 155–166 (1993). https://doi.org/10.1007/BF00798264

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  • DOI: https://doi.org/10.1007/BF00798264

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