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Direct Ultrasound Measurement of Longitudinal, Circumferential, and Radial Strain Using 2‐Dimensional Strain Imaging in Normal Adults
Author(s) -
Hurlburt Heather M.,
Aurigemma Gerard P.,
Hill Jeffrey C.,
Narayanan Arumugam,
Gaasch William H.,
Vinch Craig S.,
Meyer Theo E.,
Tighe Dennis A.
Publication year - 2007
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1111/j.1540-8175.2007.00460.x
Subject(s) - radial stress , ultrasound , doppler imaging , fractional shortening , strain (injury) , speckle pattern , medicine , cardiology , nuclear medicine , radiology , ejection fraction , physics , diastole , optics , heart failure , velocity vector , blood pressure , mechanics
Current noninvasive techniques used to evaluate left ventricular systolic function are limited by dependence on the angle of insonation (tissue Doppler imaging/TDI) or limited by availability (MRI tagging). We utilized 2‐dimensional speckle strain (ε) imaging (1) to establish normal values for all three ε vectors; (2) to compare circumferential ε values with circumferential shortening (midwall fractional shortening (FS mw ); (3) to examine the relationship between left ventricular ε and wall stress; and (4) to compare 2D echocardiographic characteristics by gender. Echocardiography was performed in 60 normal subjects (mean 39 ± 15 years). Small, but significant regional heterogeneity was seen in circumferential ε, but not in radial or longitudinal ε. We found an inverse correlation between circumferential ε and stress (r =−0.29, p<0.05) as well as longitudinal ε and stress (r =−0.11, P < 0.05), though the relationships were not close. We also observed a linear relationship between mean circumferential ε and FS mw (r = 0.29, P < 0.05). In conclusion, (1) 2‐dimensional ε imaging permits measurement of regional systolic ε values in the majority of normal individuals; (2) ε values furnished by this method obey expected stress‐shortening relationships; (3) systolic ε displays minor regional heterogeneity in the circumferential direction; (4) for the first time, a close relationship between FS mw and mean circumferential ε was demonstrated; and (5) there are minor gender‐related differences in LV geometry and function.