title: Sympathetic responses during saline infusion into the veins of an occluded limb.
abstract: Animal studies have shown that the increased intravenous pressure stimulates the group III and IV muscle afferent fibres, and in turn induce cardiovascular responses. However, this pathway of autonomic regulation has not been examined in humans. The aim of this study was to examine the hypothesis that infusion of saline into the venous circulation of an arterially occluded vascular bed evokes sympathetic activation in healthy individuals. Blood pressure, heart rate, and muscle sympathetic nerve activity (MSNA) responses were assessed in 19 young healthy subjects during local infusion of 40 ml saline into a forearm vein in the circulatory arrested condition. From baseline (11.8 +/- 1.2 bursts min(-1)), MSNA increased significantly during the saline infusion (22.5 +/- 2.6 bursts min(-1), P < 0.001). Blood pressure also increased significantly during the saline infusion. Three control trials were performed during separate visits. The results from the control trial show that the observed MSNA and blood pressure responses were not due to muscle ischaemia. The present data show that saline infusion into the venous circulation of an arterially occluded vascular bed induces sympathetic activation and an increase in blood pressure. We speculate that the infusion under such conditions stimulates the afferent endings near the vessels, and evokes the sympathetic activation.
authors.affiliation: Penn State Heart & Vascular Institute, Pennsylvania State University College of Medicine, Milton S. Hershey Medical Center, Hershey, PA 17033, USA.
authors.forename: Jian
authors.initials: J
authors.lastname: Cui
authors.forename: Patrick
authors.initials: P
authors.lastname: McQuillan
authors.forename: Raman
authors.initials: R
authors.lastname: Moradkhan
authors.forename: Charles
authors.initials: C
authors.lastname: Pagana
authors.forename: Lawrence I
authors.initials: LI
authors.lastname: Sinoway
mesh_terms: D001132:Arm / Q000098:blood supply* / Q000294:innervation / Q000502:physiology; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D007262:Infusions, Intravenous; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects / Q000294:innervation / Q000502:physiology*; D012965:Sodium Chloride / Q000008:administration & dosage*; D013564:Sympathetic Nervous System / Q000187:drug effects / Q000502:physiology*; D014661:Vasoconstriction; D014680:Veins / Q000187:drug effects / Q000502:physiology*; D055815:Young Adult
chemical_list: D012965:Sodium Chloride