Characteristics of left ventricular longitudinal strain measured by two-dimensional speckle tracking imaging in dogs
Pu Lihong
Sun Qiwei
Yang Ya
Li Rongjuan
Liu Guowen
Yang Jiao
Abstract：Objective To evaluate the characteristics of left ventricular longitudinal strain by two-dimensional speckle tracking imaging (STI) in dogs.Methods A total of 27 healthy adult dogs had intravenous anesthesia with 3％ pemobarbital sodium;electrocardiography was performed to record heart function indexes;left ventricular longitudinal strain peak systolic velocities with apical four,three,two chamber views were analyzed.Results The general left ventricular longitudinal strain peak systolic velocity in basic state in dogs was (11.2 ± 3.3) ％;the peak systolic velocity was positively correlated with left ventricular ejection fraction (r =0.84;P ＜0.05).The longitudinal strain curve shape and the peak time from different segments of left ventricular were basically identical during cardiac cycles.There were significant differences of left ventricular longitudinal strain peak systolic velocity absolute values from apical segment,intermediate and basal septum,anterior septum,anterior wall,side wall,back wall and inferior wall[endocardium:(15.0 ± 1.4) ％,(13.2 ± 1.8) ％ vs (11.3 ± 2.0) ％;(13.5±2.3)％ vs (11.8±2.2)％;(15.4±1.1)％,(13.2±1.4)％ vs (11.1±2.3)％;(15.8±2.1)％,(13.3±2.4)％ vs (11.3±2.3)％;(13.0±1.3)％ vs(10.9±2.0)％;(16.4±1.9)％,(12.9±1.4)％ vs (11.1±2.0)％;midmyocardium:(13.8 ±2.2)％,(11.1 ±2.2)％ vs (9.9 ±2.7)％;(11.3 ±2.8)％ vs (9.4±2.0)％;(12.3±2.7)％,(10.8±2.5)％ vs (8.2±2.2)％;(11.8±3.2)％,(9.5±3.0)％ vs (9.3±3.2)％;(9.4±2.0)％ vs (8.0±2.8)％;(13.0±2.4)％,(10.4±1.9)％ vs (7.3±2.0)％;epicardium:(12.9±1.8)％,(9.2±1.9)％ vs (8.9±2.8)％;(9.4±2.1)％ vs (8.4±2.7)％;(12.2±3.0)％,(8.8±1.0)％ vs (8.1±2.9)％;(11.9±2.0)％,(9.2±1.9)％ vs (8.3±2.8)％;(9.0±0.9)％ vs (7.7± 2.3) ％;(12.7 ± 1.7) ％,(10.4 ± 1.1) ％ vs (7.2 ± 1.2) ％] (P ＜ 0.05).The left ventricular longitudinal strain peak systolic velocityvalues from different segments of epicardium were significantly lower than those of endocardium (P ＜ 0.05).Conclusion The general longitudinal movement of left ventricular is identical in healthy adult dogs;the longitudinal strains from different segments of epicardium are lower than those of endocardium.
Keywords：EchocardiographyTwo-dimensional speckle tracking imaging
Publication Date：2017-02-28
Online Publishing Date：2026-09-14(First online date of this platform, not the publication date of the document)
Pages：4( 203-206 )