title: Prospective comparison of speckle tracking longitudinal bidimensional strain between two vendors.
abstract: BACKGROUND
  Speckle tracking is a relatively new, largely angle-independent technique used for the evaluation of myocardial longitudinal strain (LS). However, significant differences have been reported between LS values obtained by speckle tracking with the first generation of software products.
  
  
  OBJECTIVE
  To compare LS values obtained with the most recently released equipment from two manufacturers.
  
  
  METHODS
  Systematic scanning with head-to-head acquisition with no modification of the patient's position was performed in 64 patients with equipment from two different manufacturers, with subsequent off-line post-processing for speckle tracking LS assessment (Philips QLAB 9.0 and General Electric [GE] EchoPAC BT12). The interobserver variability of each software product was tested on a randomly selected set of 20 echocardiograms from the study population.
  
  
  RESULTS
  GE and Philips interobserver coefficients of variation (CVs) for global LS (GLS) were 6.63% and 5.87%, respectively, indicating good reproducibility. Reproducibility was very variable for regional and segmental LS values, with CVs ranging from 7.58% to 49.21% with both software products. The concordance correlation coefficient (CCC) between GLS values was high at 0.95, indicating substantial agreement between the two methods. While good agreement was observed between midwall and apical regional strains with the two software products, basal regional strains were poorly correlated. The agreement between the two software products at a segmental level was very variable; the highest correlation was obtained for the apical cap (CCC 0.90) and the poorest for basal segments (CCC range 0.31-0.56).
  
  
  CONCLUSIONS
  A high level of agreement and reproducibility for global but not for basal regional or segmental LS was found with two vendor-dependent software products. This finding may help to reinforce clinical acceptance of GLS in everyday clinical practice.
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Castel
authors.affiliation: INSERM U 1088, Université de Picardie, Amiens, France; Centre Hospitalier Universitaire d'Amiens, Amiens, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Szymanski
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: François
authors.initials: F
authors.lastname: Delelis
authors.affiliation: Centre Hospitalier Universitaire d'Amiens, Amiens, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Levy
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: Aymeric
authors.initials: A
authors.lastname: Menet
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: Amandine
authors.initials: A
authors.lastname: Mailliet
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Marotte
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Graux
authors.affiliation: INSERM U 1088, Université de Picardie, Amiens, France; Centre Hospitalier Universitaire d'Amiens, Amiens, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Tribouilloy
authors.affiliation: Université Lille Nord de France, GCS-Groupement des Hôpitaux de l'Institut Catholique de Lille, Faculté Libre de Médecine, Université Catholique de Lille, Lomme, France; INSERM U 1088, Université de Picardie, Amiens, France. Electronic address: sylvestre.marechaux@yahoo.fr.
authors.forename: Sylvestre
authors.initials: S
authors.lastname: Maréchaux
mesh_terms: D000368:Aged; D015150:Echocardiography, Doppler / Q000295:instrumentation*; D004867:Equipment Design; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D015588:Observer Variation; D011237:Predictive Value of Tests; D011446:Prospective Studies; D015203:Reproducibility of Results; D016277:Ventricular Function, Left
keywords: Echocardiography; Global longitudinal strain; Speckle tracking; Strain longitudinal global; Échocardiographie