| Transmural heterogeneity and remodeling of ventricular excitation-contraction coupling in human heart failure. | |
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MedLine Citation:
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PMID: 21502574 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Excitation-contraction (EC) coupling is altered in end-stage heart failure. However, spatial heterogeneity of this remodeling has not been established at the tissue level in failing human heart. The objective of this article was to study functional remodeling of excitation-contraction coupling and calcium handling in failing and nonfailing human hearts. METHODS AND RESULTS: We simultaneously optically mapped action potentials and calcium transients in coronary perfused left ventricular wedge preparations from nonfailing (n=6) and failing (n=5) human hearts. Our major findings are the following. First, calcium transient duration minus action potential duration was longer at subendocardium in failing compared with nonfailing hearts during bradycardia (40 bpm). Second, the transmural gradient of calcium transient duration was significantly smaller in failing hearts compared with nonfailing hearts at fast pacing rates (100 bpm). Third, calcium transient in failing hearts had a flattened plateau at the midmyocardium and exhibited a 2-component slow rise at the subendocardium in 3 failing hearts. Fourth, calcium transient relaxation was slower at the subendocardium than at the subepicardium in both groups. Protein expression of sarcoplasmic reticulum Ca(2+)-ATPase 2a was lower at the subendocardium than the subepicardium in both nonfailing and failing hearts. Sarcoplasmic reticulum Ca(2+)-ATPase 2a protein expression at subendocardium was lower in hearts with ischemic cardiomyopathy compared with those with nonischemic cardiomyopathy. CONCLUSIONS: For the first time, we present direct experimental evidence of transmural heterogeneity of excitation-contraction coupling and calcium handling in human hearts. End-stage heart failure is associated with the heterogeneous remodeling of excitation-contraction coupling and calcium handling. |
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Authors:
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Qing Lou; Vadim V Fedorov; Alexey V Glukhov; Nader Moazami; Vladimir G Fast; Igor R Efimov |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural Date: 2011-04-18 |
Journal Detail:
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Title: Circulation Volume: 123 ISSN: 1524-4539 ISO Abbreviation: Circulation Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-05-03 Completed Date: 2011-07-13 Revised Date: 2012-05-04 |
Medline Journal Info:
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Nlm Unique ID: 0147763 Medline TA: Circulation Country: United States |
Other Details:
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Languages: eng Pagination: 1881-90 Citation Subset: AIM; IM |
Affiliation:
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Department of Biomedical Engineering, Washington University, St. Louis, MO, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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physiology* Adult Aged Calcium / metabolism* Calcium Channels / physiology Calcium-Binding Proteins / metabolism Cardiomyopathies / metabolism, physiopathology Female Heart Failure / metabolism, physiopathology* Humans Male Middle Aged Myocardial Contraction / physiology* Myocardial Ischemia / metabolism, physiopathology Sarcoplasmic Reticulum Calcium-Transporting ATPases / metabolism Ventricular Remodeling / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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HL067322/HL/NHLBI NIH HHS; HL074283/HL/NHLBI NIH HHS; HL085369/HL/NHLBI NIH HHS; R01 HL085369-03/HL/NHLBI NIH HHS; R01 HL085369-04/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Calcium Channels; 0/Calcium-Binding Proteins; 0/phospholamban; 7440-70-2/Calcium; EC 3.6.3.8/Sarcoplasmic Reticulum Calcium-Transporting ATPases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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