Document Detail


Autonomic control of the cardiovascular system in the cat during hypoxemia.
MedLine Citation:
PMID:  23265983     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study aimed to determine the roles played by the autonomic interoreceptors, the carotid bodies (cbs) and the aortic bodies (abs) in anesthetized, paralyzed, artificially ventilated cats' response to systemic hypoxemia. Four 15min challenges stimulated each of 15 animals: (1) hypoxic hypoxia (10%O(2) in N(2); HH) in the intact (int) cat where both abs and cbs sent neural traffic to the nucleus tractus solitarius (NTS); (2) carbon monoxide hypoxia (30%O(2) in N(2) with the addition of CO; COH) in the intact cat where only the abs sent neural traffic to the NTS; (3) HH in the cat after transection of both aortic depressor nerves, resecting the aortic bodies (HHabr), where only the cbs sent neural traffic to the NTS; (4) COH to the abr cat where neither abs nor cbs sent neural traffic to the NTS. Cardiac output (C.O.), contractility (dP/dt(MAX)), systolic/diastolic pressures, aortic blood pressure, total peripheral resistance, pulmonary arterial pressure, and pulmonary vascular resistance (PVR) were measured. When both cbs and abs were active the maximum increases were observed except for PVR which decreased. Some variables showed the cbs to have a greater effect than the abs. The abs proved to be important during some challenges for maintaining blood pressure. The data support the critically important role for the chemoreceptor-sympathetic nervous system connection during hypoxemia for maintaining viable homeostasis, with some differences between the cbs and the abs.
Authors:
Robert S Fitzgerald; Gholam Abbas Dehghani; Samara Kiihl
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-19
Journal Detail:
Title:  Autonomic neuroscience : basic & clinical     Volume:  -     ISSN:  1872-7484     ISO Abbreviation:  Auton Neurosci     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100909359     Medline TA:  Auton Neurosci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Department of Environmental Health Sciences (Division of Physiology), The Johns Hopkins Medical Institutions, 615 North Wolfe Street, Baltimore, MD 21205, USA; Department of Physiology, The Johns Hopkins Medical Institutions, 615 North Wolfe Street, Baltimore, MD 21205, USA; Department of Medicine, The Johns Hopkins Medical Institutions, 615 North Wolfe Street, Baltimore, MD 21205, USA. Electronic address: rfitzger@jhsph.edu.
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