Differential intracardiac sympathetic and parasympathetic innervation to the SA and AV nodes in anesthetized dog hearts.
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概要
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Stimulation of discrete intracardiac sympathetic nerves to the SA (SAS stimulation) or AV nodal region (AVS stimulation) increased the heart rate or decreased AV conduction time and caused an AV junctional rhythm, respectively, in anesthetized dogs treated with atropine. Topical application of tetrodotoxin (TTX) at the SAS or AVS stimulation locus totally inhibited the response to each stimulation, whereas each TTX treatment slightly attenuated the chronotropic response to the right ansa stimulation by 23 ± 7.7% and the dromotropic response to the left ansa stimulation by 7 ± 7.5%. TTX abolished AVS stimulation-induced one. Before atropine, topical application of hexamethonium at the locus for stimulation of intracardiac parasympathetic nerves to the SA (SAP stimulation) or AV nodal region (AVP stimulation) abolished almost totally negative chronotropic responses to SAP and cervi cal vagus stimulation or negative dromotropic responses to AVP and cervical vagus sti mulation, respectively. These results demonstrate that activation of a very small population of intracardiac sympathetic nerves to target cells is enough to induce positive chronotropic and dromotropic responses in the heart in situ, and that SA and AV nodal pacemaker activity and AV conductivity are controlled multi-directionally by in tracardiac sympathetic nerves in contrast with parasympathetic ones.
- 公益社団法人 日本薬理学会の論文
著者
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Furukawa Yasuyuki
Department Of Pharmacology Shinshu University School Of Medicine
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Chiba Shigetoshi
Departmen T Of Pharmacology Shinshu University School Of Medicine
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Narita Masahiro
Department Of Anesthesiology And Resuscitology Shinshu University School Of Medicine
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Haniuda Masayuki
2nd Department of Surgery, Shinshu University School of Medicine
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Chiba Shigetoshi
Department of Pharmacology , Shinshu University School of Medicine
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Takei Manabu
Department of Pharmacology , Shinshu University School of Medicine
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Kobayashi Osamu
2nd Department of Surgery, Shinshu University School of Medicine
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