Document Detail


Skeletal muscle ventricles, left ventricular apex-to-aorta configuration. 1 to 11 weeks in circulation.
MedLine Citation:
PMID:  9008469     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Skeletal muscle ventricles (SMVs) have been used in animals in a variety of configurations to provide circulatory assistance. Long-term survival and function have been demonstrated. Our laboratory recently obtained promising short-term hemodynamic data in a left ventricular apex-to-aorta model. METHODS AND RESULTS: SMVs were constructed from the left latissimus dorsi muscle in five adult mongrel dogs. After a 3-week period of vascular delay and 5 to 7 weeks of electrical conditioning, valved conduits were used to connect the left ventricular apex to the SMV and the SMV to the descending aorta. The SMV was then stimulated to contract during cardiac diastole. Initial measurements showed a significant increase in the mean femoral diastolic pressure (62 +/- 6 versus 51 +/- 5 mm Hg, P < .05). There was also a decrease in the left ventricular tension-time index (11.5 +/- 2.5 versus 14.6 +/- 2.1 mm Hg.s, P < .05), indicating a decrease in the work requirement of the left ventricle. During SMV stimulation, the majority of flow (65%) was through the SMV circuit and was associated with reversal of flow in the proximal descending thoracic aorta. The longest-surviving animal survived 76 days, at which time pressure augmentation was still seen (mean femoral diastolic pressure, 63 +/- 0.9 versus 50 +/- 1.2 mm Hg, P < .05). CONCLUSIONS: Survival beyond the acute setting is possible with this model. Diastolic pressure augmentation can be effectively maintained over time.
Authors:
K A Greer; H Lu; A D Spanta; R L Hammond; L W Stephenson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  95     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-02-27     Completed Date:  1997-02-27     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  497-502     Citation Subset:  AIM; IM    
Affiliation:
Division of Cardiothoracic Surgery, Wayne State University School of Medicine, Detroit, Mich., USA. kgreer@med.wayne.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Aorta, Thoracic / physiopathology
Blood Pressure
Cardiomyoplasty / methods*
Carotid Arteries / physiopathology
Diastole
Dogs
Electric Stimulation
Femoral Artery / physiopathology
Regional Blood Flow
Survival Analysis
Time Factors
Ventricular Function, Left*
Grant Support
ID/Acronym/Agency:
F32-H209292-01//PHS HHS; NHLB-34778-11/HL/NHLBI NIH HHS

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


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