Document Detail


Assessment of the pressure-volume relationship of the single ventricle of the grass shrimp, Palaemonetes pugio.
MedLine Citation:
PMID:  17562893     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The ventricular pressure-volume (PV) relationship has been used extensively to study the mechanics and energetics in multi-chambered hearts of closed circulatory system vertebrates. In the current study we applied the use of PV loops in the assessment of cardiac mechanics and energetics in the single ventricle of a decapod crustacean possessing an open circulatory system. Anatomical differences between multi-and single-chambered hearts include multiple ostia entering and valved multiple arterial systems exiting the ventricle, and the neurogenic origin of the heartbeat in decapod crustaceans. However, the microscopic architecture and excitation-contraction coupling events are similar in both systems. Ventricular pressure and area were obtained independently and integrated into pressure-area loops. Area was then converted to volume to generate PV loops. Based on the PV loops generated in this study, the ventricle of Palaemonetes pugio processes the same primary phases of the cardiac cycle as ventricles from the multi-chambered hearts of vertebrates: (1) isovolumic contraction, (2) ventricular emptying, (3) isovolumic relaxation and (4) ventricular filling. The area enclosed by the PV loop provides a measure of stroke work and when multiplied by heart rate provides an assessment of cardiac work. This initial examination of PV loops from a single-ventricle decapod crustacean demonstrates the utility of this technique to further elucidate the cardiac mechanics and energetics of this system, and in particular during times of physiological stress.
Authors:
J A Guadagnoli; K Tobita; C L Reiber
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  210     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-06-12     Completed Date:  2007-08-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  2192-8     Citation Subset:  IM    
Affiliation:
College of Osteopathic Medicine, Touro University - Nevada, Henderson, NV 89014, USA. jguadagnoli@touro.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Heart / anatomy & histology*,  physiology*
Palaemonidae / physiology*
Pressure
Stroke Volume

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


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