| Alterations in left ventricular torsion in tachycardia-induced dilated cardiomyopathy. | |
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MedLine Citation:
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PMID: 12091807 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Left ventricular torsion reduces transmural systolic gradients of fiber strain, and torsional recoil in early diastole is thought to enhance left ventricular filling. Left ventricular remodeling in dilated cardiomyopathy may result in changes in torsion dynamics, but these effects are not yet characterized. Tachycardia-induced cardiomyopathy is accompanied by systolic and diastolic heart failure and left ventricular remodeling. We hypothesized that cardiomyopathy would alter systolic and diastolic left ventricular torsion mechanics, and this hypothesis was tested by studying sheep before and after the development of tachycardia-induced cardiomyopathy. METHODS: Implanted miniature radiopaque markers were used in 8 sheep to measure left ventricular geometry and function, maximal torsional deformation, and early diastolic recoil before and after rapid ventricular pacing was used to create tachycardia-induced cardiomyopathy. RESULTS: All animals had significant heart failure with ventricular dilatation and remodeling. With tachycardia-induced cardiomyopathy, maximum torsion relative to control conditions decreased (1.69 degrees +/- 0.61 degrees vs 4.25 degrees +/- 2.33 degrees ), and early diastolic recoil was completely abolished (0.53 degrees +/- 1.19 degrees vs -1.17 degrees +/- 0.94 degrees ). CONCLUSIONS: Cardiomyopathy is accompanied by decreased and delayed systolic left ventricular torsional deformation and loss of early diastolic recoil, which may contribute to left ventricular dysfunction by increasing systolic transmural strain gradients and impairing diastolic filling. Analysis of left ventricular torsion with radiofrequency-tagging magnetic resonance imaging should be explored to elucidate the role of torsion in patients with cardiomyopathy. |
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Authors:
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Frederick A Tibayan; David T M Lai; Tomasz A Timek; Paul Dagum; David Liang; George T Daughters; Neil B Ingels; D Craig Miller |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of thoracic and cardiovascular surgery Volume: 124 ISSN: 0022-5223 ISO Abbreviation: J. Thorac. Cardiovasc. Surg. Publication Date: 2002 Jul |
Date Detail:
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Created Date: 2002-07-01 Completed Date: 2002-08-06 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376343 Medline TA: J Thorac Cardiovasc Surg Country: United States |
Other Details:
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Languages: eng Pagination: 43-9 Citation Subset: AIM; IM |
Affiliation:
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Department of Cardiovascular and Thoracic Surgery, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA 94305-5247, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cardiac Pacing, Artificial Cardiomyopathy, Dilated / etiology, physiopathology* Hemodynamics / physiology Myocardial Contraction / physiology Sheep Tachycardia / physiopathology Torsion Abnormality Ventricular Dysfunction, Left / physiopathology* Ventricular Remodeling / physiology |
| Grant Support | |
ID/Acronym/Agency:
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HL-09569/HL/NHLBI NIH HHS; HL-10452/HL/NHLBI NIH HHS; HL-29589/HL/NHLBI NIH HHS; HL-67025/HL/NHLBI NIH HHS; HL-67563/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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