Document Detail


Cardiac responses to anoxia in the Pacific hagfish, Eptatretus stoutii.
MedLine Citation:
PMID:  20952617     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the absence of any previous study of the cardiac status of hagfishes during prolonged anoxia and because of their propensity for oxygen-depleted environments, the present study tested the hypothesis that the Pacific hagfish Eptatretus stoutii maintains cardiac performance during prolonged anoxia. Heart rate was halved from the routine value of 10.4±1.3 beats min⁻¹ by the sixth hour of an anoxic period and then remained stable for a further 30 h. Cardiac stroke volume increased from routine (1.3±0.1 ml kg⁻¹) to partially compensate the anoxic bradycardia, such that cardiac output decreased by only 33% from the routine value of 12.3±0.9 ml min⁻¹ kg⁻¹. Cardiac power output decreased by only 25% from the routine value of 0.26±0.02 mW g⁻¹. During recovery from prolonged anoxia, cardiac output and heart rate increased to peak values within 1.5 h. Thus, the Pacific hagfish should be acknowledged as hypoxic tolerant in terms of its ability to maintain around 70% of their normoxic cardiac performance during prolonged anoxia. This is only the second fish species to be so classified.
Authors:
Georgina K Cox; Erik Sandblom; Anthony P Farrell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  213     ISSN:  1477-9145     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-18     Completed Date:  2011-01-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3692-8     Citation Subset:  IM    
Affiliation:
Department of Zoology, University of British Columbia, Vancouver, V6T 1Z4, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Anoxia / physiopathology*
Aorta / physiology
Coronary Circulation / physiology
Hagfishes / physiology*
Heart / physiology*
Pacific Ocean
Species Specificity
Time Factors

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


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