Experimental Validation of Circumferential, Longitudinal, and Radial 2-Dimensional Strain During Dobutamine Stress Echocardiography in Ischemic Conditions

• Published in: Journal of the American College of Cardiology Vol. 51; no. 2; pp. 149 - 157
• Main Authors: Reant, Patricia, Labrousse, Louis, Lafitte, Stephane, Bordachar, Pierre, Pillois, Xavier, Tariosse, Liliane, Bonoron-Adele, Simone, Padois, Philippe, Deville, Claude, Roudaut, Raymond, Dos Santos, Pierre
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 15.01.2008; Elsevier Limited
• Subjects: Animals; Cardiology; Cardiovascular; Cardiovascular disease; Coronary vessels; Crystals; Disease Models, Animal; Dobutamine; Echocardiography, Stress - methods; Heart; Heart rate; Hemodynamics - physiology; Internal Medicine; Ischemia; Laboratory animals; Linear Models; Male; Myocardial Ischemia - diagnostic imaging; Observer Variation; Probability; Random Allocation; Sensitivity and Specificity; Signal Processing, Computer-Assisted; Software; Swine; Ventricular Dysfunction, Left - diagnostic imaging; CS; RS; 2D; DSE; LS; ICC; LV; WT; CA; LAD; RA; circumferential strain; left ventricle; left anterior descending coronary artery; dobutamine stress echocardiography; radial strain; control area; two-dimensional; longitudinal strain; risk area; intraclass correlation coefficient; wall thickening
• ISSN: 0735-1097; 1558-3597; 1558-3597
• DOI: 10.1016/j.jacc.2007.07.088

Experimental Validation of Circumferential, Longitudinal, and Radial 2-Dimensional Strain During Dobutamine Stress Echocardiography in Ischemic Conditions Patricia Reant, Louis Labrousse, Stephane Lafitte, Pierre Bordachar, Xavier Pillois, Liliane Tariosse, Simone Bonoron-Adele, Philippe Padois, Claude Deville, Raymond Roudaut, Pierre Dos Santos The aim of this study was to assess and validate 2-dimensional strain echocardiography for detection of ischemia during dobutamine stress. Myocardial deformation was studied in 10 open-chest pigs under control and ischemic conditions. We found good correlation and agreement with sonomicrometric data at rest and during dobutamine infusion. In the presence of nonflow-limiting stenoses, dobutamine significantly decreased circumferential and longitudinal strains. By contrast, radial strain was significantly decreased in the presence of flow-limiting stenoses only. Evaluation of circumferential and longitudinal strains has real potential for quantitative evaluation of left ventricular deformation in the routine clinical detection of ischemia. The aim of this study was to assess and validate 2-dimensional (2D) strain for the detection of ischemia during dobutamine stress echocardiography (DSE). Evaluation of abnormalities of left ventricular (LV) function from wall thickening during DSE is unsatisfactory and requires a high level of expertise. 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. 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. 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.