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      Changes in Autonomic Nerve Activity during Acute Pericardial Tamponade

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          Abstract

          Acute experimental pericardial tamponade in anesthetized mongrel dogs produces marked alterations of autonomic reflex mechanisms. Afferent nerve activity from left ventricular receptors is inhibited during tamponade, whereas pericardial receptors are excited. Sympathetic efferent nerve activity traversing the ansae subclaviae is markedly increased during tamponade by the carotid sinus baroreceptor reflex and also by other undefined mechanisms. The increase in sympathetic activity produces a transient tachycardia and inotropic effect. A paradoxical increase in cardiac vagal efferent nerve activity occurs during the period of maximal hypotension and appears to override the normal baroreceptor reflexes. This increase in vagal efferent activity corresponds to the development of a marked bradycardia during prolonged cardiac tamponade.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1980
          1980
          31 October 2008
          : 66
          : 3
          : 163-173
          Affiliations
          Departments of Anesthesiology, Physiology and Medicine, The Medical College of Wisconsin and Wood Veterans Administration Medical Center, Milwaukee, Wisc.
          Article
          170861 Cardiology 1980;66:163–173
          10.1159/000170861
          7407806
          © 1980 S. Karger AG, Basel

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          Page count
          Pages: 11
          Categories
          Original Paper

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