Speckle Tracking Echocardiography Identifies Impaired Longitudinal Strain as a Common Deficit in Various Cardiac Diseases

(整期优先)网络出版时间:2018-04-06
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Theuseofspeckle-trackingechocardiography(STE)isbecominganincreasinglyusefultoolintheevaluationofmyocardialdisease.STEsoftwarecantrackthemotionofthespecularpatterncreatedbytheinterferenceofultrasoundwiththemyofibersoftheheartandprovideaquantitativemeanstoevaluatesubtlechangesinventricularfunctionthatoftenoccurbeforechangesinventricularejectionfractionareobserved.STEismostoftenusedtomeasurethechangeinshape(strain)ofmyocardialsegmentsinthecircumferential,radial,andlongitudinaldirections.Invariousdiseases,includingcoronaryarterydisease,aorticstenosis,andmitralregurgitation,deficitsinlongitudinalstrainappeartooccurearlierthandeficitsinothermeasuresofstrainorinejectionfraction.ConsiderationofSTEmeasuresofleftventricularcontractionhasthepotentialtosignificantlyaffectclinicalmanagementandoutcomesofischemicandvalvularheartdiseasegiventheabilitytoseparatethosewithasymptomaticdiseasewhomaybenefitfromearlierinterventionsthancurrentguidelinesmaysuggest.