title: Experimental validation of circumferential, longitudinal, and radial 2-dimensional strain during dobutamine stress echocardiography in ischemic conditions.
abstract: OBJECTIVE
  The aim of this study was to assess and validate 2-dimensional (2D) strain for the detection of ischemia during dobutamine stress echocardiography (DSE).
  
  
  BACKGROUND
  Evaluation of abnormalities of left ventricular (LV) function from wall thickening during DSE is unsatisfactory and requires a high level of expertise.
  
  
  METHODS
  In 10 open-chest anesthetized pigs, myocardial deformation was studied before and during dobutamine infusion, under control and ischemic conditions produced by various degrees of coronary artery constriction: 2 of nonflow-limiting stenoses (NFLS) of increasing severity reducing left anterior descending artery hyperemic flow by 40% and 70% and 2 flow-limiting stenoses (FLS) reducing resting coronary flow by 25% and 50%. Agreement between 2D strain echocardiography and sonomicrometry (reference method) was evaluated by linear regression and Bland-Altman analysis.
  
  
  RESULTS
  Good correlation and agreement were observed between 2-dimensional strain and sonomicrometry at rest and during dobutamine infusion; longitudinal strain: r = 0.77, p < 0.001 and r = 0.80, p < 0.001; radial strain: r = 0.57, p < 0.05 and r = 0.63, p < 0.05; and circumferential strain: r = 0.74, p < 0.001 and r = 0.58, p < 0.001. Circumferential and longitudinal strains in the risk area were significantly decreased at rest in the presence of FLS and during dobutamine infusion in the presence of NFLS. By contrast, radial strain was significantly decreased in the presence of severe FLS only during dobutamine infusion.
  
  
  CONCLUSIONS
  The 2D strain provides accurate assessment of LV regional function. Evaluation of circumferential and longitudinal strains during DSE has real potential for quantitative evaluation of LV deformation in the routine assessment of ischemia.
authors.affiliation: INSERM U828 and IFR4, University of Bordeaux 2, Bordeaux, France.
authors.forename: Patricia
authors.initials: P
authors.lastname: Reant
authors.forename: Louis
authors.initials: L
authors.lastname: Labrousse
authors.forename: Stephane
authors.initials: S
authors.lastname: Lafitte
authors.forename: Pierre
authors.initials: P
authors.lastname: Bordachar
authors.forename: Xavier
authors.initials: X
authors.lastname: Pillois
authors.forename: Liliane
authors.initials: L
authors.lastname: Tariosse
authors.forename: Simone
authors.initials: S
authors.lastname: Bonoron-Adele
authors.forename: Philippe
authors.initials: P
authors.lastname: Padois
authors.forename: Claude
authors.initials: C
authors.lastname: Deville
authors.forename: Raymond
authors.initials: R
authors.lastname: Roudaut
authors.forename: Pierre
authors.initials: P
authors.lastname: Dos Santos
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004280:Dobutamine; D025401:Echocardiography, Stress / Q000379:methods*; D006439:Hemodynamics / Q000502:physiology; D016014:Linear Models; D008297:Male; D017202:Myocardial Ischemia / Q000000981:diagnostic imaging*; D015588:Observer Variation; D011336:Probability; D011897:Random Allocation; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013552:Swine; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging
chemical_list: D004280:Dobutamine