Functional and Topographic Concordance of Right Atrial Neural Structures Inducing Sinus Tachycardia

Christian Eickholt, Karl Mischke, Thomas Schimpf, Christian Knackstedt, Kira Scherer, Danius Pauza, Nikolaus Marx, Dong-In Shin, Malte Kelm, Christian Meyer*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

3 Citations (Web of Science)

Abstract

Cardiorespiratory autonomic control is in tight interaction with an intracardiac neural network modulating sinus node function. To gain novel mechanistical insights and to investigate possible novel targets concerning the treatment of inadequate sinus tachycardia, we aimed to characterize functionally and topographically the right atrial neural network modulating sinus node function. In 16 sheep 3-dimensional electro-anatomical mapping of the right atrium was performed. In five animals additionally magnetically steered remote navigation was used. Selective stimulation of nerve fibers was conducted by applying high frequency (200 Hz) electrical impulses within the atrial refractory period. Histological analysis of whole heart preparations by acetylcholinesterase staining was performed and compared to the acquired neuroanatomical mapping.We found that neural stimulation in the cranial part of the right atrium, within a perimeter around the sinus node area, elicited predominantly shortening of the sinus cycle length of -20.3 ? 10.1 % (n = 80, P <0.05). Along the course of the crista terminalis atrial premature beats (n = 117) and atrial fibrillation (n = 123) could be induced. Catheter stability was excellent during remote catheter navigation. Histological work-up (n = 4) was in accord with the distribution of neurostimulation sites. Ganglions were mainly innervated by the dorsal right-atrial subplexus, with substantial additional input from the ventral right atrial subplexus. In conclusion, our findings suggest a functional and topographic concordance of right atrial neural structures inducing sinus tachycardia. This might open up new avenues in the treatment of heart rate related disorders.
Original languageEnglish
Title of host publicationNEUROBIOLOGY OF RESPIRATION
Pages273-282
Volume788
DOIs
Publication statusPublished - 2013

Publication series

SeriesAdvances in Experimental Medicine and Biology

Keywords

  • Autonomic nervous system
  • Cardiac electrophysiology
  • Cardiac innervation
  • Cardiorespiratory regulation
  • Electrophysiologic mapping
  • Remote magnetic navigation

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