ECHO 2013 / Quantifying Myocardial Mechanics Strain and Torsion

Quantifying LV Mechanics

Strain and Torsion

James D. Thomas, MD, FASE, FACC , FESC, FAHA

Moore Chair of Cardiovascular Imaging

Heart and Vascular Institute

Cleveland Clinic Foundation

Cleveland, Ohio, USA

Past President, American Society of Echocardiography

Conflicts: None

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Disclosure Statement of Financial

Interest

I, James D. Thomas, DO NOT have a financial interest/arrangement or affiliation with one or more organizations that could be perceived as a real or apparent conflict of interest in the context of the subject of this presentation.

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Myocardial Strain: What is It??

Strain: dimensionless index of change in length

Strain ( ) = L-L0/ L0

L

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Strain: More Than a Number

3D Tensor with Linear and Shear Components

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Deriving strain directly from the B-mode image

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Derivation of 2D Strain by Echo

BLOCK

Y

New location dY Old location

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Longitudinal Strain from B-Mode Echo

Normal Subject

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Longitudinal Strain

Dilated Cardiomyopathy

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Bull's-eye Plot from 3 Apical Views

Apical

3

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Global Longitudinal Strain is 20±3%

Absolute Strain Rate Falls With Age

Age groups