Alterations in left ventricular torsion in tachycardia-induced dilated cardiomyopathy

Frederick (Fred) Tibayan, David T M Lai, Tomasz A. Timek, Paul Dagum, David Liang, George T. Daughters, Neil B. Ingels, D. Craig Miller

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

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° ± 0.61° vs 4.25° ± 2.33°), and early diastolic recoil was completely abolished (0.53° ± 1.19° vs -1.17° ± 0.94°). 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.

Original languageEnglish (US)
Pages (from-to)43-49
Number of pages7
JournalJournal of Thoracic and Cardiovascular Surgery
Volume124
Issue number1
DOIs
StatePublished - Jul 1 2002
Externally publishedYes

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Dilated Cardiomyopathy
Cardiomyopathies
Tachycardia
Ventricular Remodeling
Sheep
Diastolic Heart Failure
Systolic Heart Failure
Diastole
Left Ventricular Dysfunction
Mechanics
Left Ventricular Function
Dilatation
Heart Failure
Magnetic Resonance Imaging

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery

Cite this

Alterations in left ventricular torsion in tachycardia-induced dilated cardiomyopathy. / Tibayan, Frederick (Fred); Lai, David T M; Timek, Tomasz A.; Dagum, Paul; Liang, David; Daughters, George T.; Ingels, Neil B.; Miller, D. Craig.

In: Journal of Thoracic and Cardiovascular Surgery, Vol. 124, No. 1, 01.07.2002, p. 43-49.

Research output: Contribution to journalArticle

Tibayan, FF, Lai, DTM, Timek, TA, Dagum, P, Liang, D, Daughters, GT, Ingels, NB & Miller, DC 2002, 'Alterations in left ventricular torsion in tachycardia-induced dilated cardiomyopathy', Journal of Thoracic and Cardiovascular Surgery, vol. 124, no. 1, pp. 43-49. https://doi.org/10.1067/mtc.2002.121299
Tibayan, Frederick (Fred) ; Lai, David T M ; Timek, Tomasz A. ; Dagum, Paul ; Liang, David ; Daughters, George T. ; Ingels, Neil B. ; Miller, D. Craig. / Alterations in left ventricular torsion in tachycardia-induced dilated cardiomyopathy. In: Journal of Thoracic and Cardiovascular Surgery. 2002 ; Vol. 124, No. 1. pp. 43-49.
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