Document Detail


Cardiovascular and hormonal responses to anaphylactic shock in the pig.
MedLine Citation:
PMID:  7712695     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cardiovascular and hormonal responses to anaphylactic shock were evaluated in anaesthetized pigs sensitized by natural exposure to Ascaris suum as verified by antibodies. In six animals with such antibodies, Ascaris antigen injection produced a plasma histamine increase of 52 (42-196) fold (median and range; P < 0.05), while four pigs without such antibodies served as controls with only insignificant increases in histamine. In the anaphylactic group, two of the animals died during the investigation due to cardiovascular collapse. In the sensitized pigs resting heart rate (HR), 104 (86-118) beats min-1, increased to 204 (164-240) beats min-1 as mean arterial pressure (MAP) decreased from 94 (83-102) to 45 (31-90) mmHg (P < 0.05). In contrast, the non-sensitized pigs maintained the resting HR of 101 (79-113) beats min-1, as MAP decreased to 50 (41-97) mmHg (P < 0.05). In the sensitized group systemic vascular resistance (SVR) fell from 1114 (843-1811) to 990 (588-1173) dyne s-1 cm-5 and then increased to 3617 (2593-4166) dyne s-1 cm-5, while in the control group there was only a reduction to a minimum value of 730 (458-1307) dyne s-1 cm-5 (P < 0.05). Thoracic electrical impedance increased only in the sensitized group [from 28.3 (24.7-31.4) to 29.9 (24.0-31.4)], indicating central volume depletion. Plasma catecholamines increased markedly only in the sensitized pigs, and plasma pancreatic polypeptide, vasopressin, aldosterone and renin responses confirmed to those established during central hypovolaemia. During anaphylaxis, this study demonstrated cardiovascular responses similar to those established during a major blood loss. However, as indicated by plasma catecholamines, sympathetic activity was many times that previously demonstrated during haemorrhage, and sympathoactivation may explain the marked vasoconstriction noted in the sensitized pigs.
Authors:
J Jacobsen; C R Johnsen; P S Skov; J Warberg; U Knigge; N H Secher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical physiology (Oxford, England)     Volume:  15     ISSN:  0144-5979     ISO Abbreviation:  Clin Physiol     Publication Date:  1995 Jan 
Date Detail:
Created Date:  1995-05-17     Completed Date:  1995-05-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8309768     Medline TA:  Clin Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  81-90     Citation Subset:  IM    
Affiliation:
Copenhagen Muscle Research Center, Department of Anaesthesia, Rigshospitalet, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Anaphylaxis / blood,  physiopathology*
Animals
Blood Pressure
Cardiovascular System / physiopathology*
Central Venous Pressure
Heart Rate
Histamine / blood
Hormones / blood*
Swine
Chemical
Reg. No./Substance:
0/Hormones; 51-45-6/Histamine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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