Charlotte Bjork Ingul1, Asbjorn Stoylen2, Stig A Slordahl2, Rune Wiseth2, Malcolm Burgess3, Thomas H Marwick4. 1. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway; University of Queensland, Brisbane, Australia. 2. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway. 3. University of Queensland, Brisbane, Australia. 4. University of Queensland, Brisbane, Australia.. Electronic address: tmarwick@uq.edu.au.
Abstract
OBJECTIVES: We investigated the accuracy of automated analysis of myocardial deformation during dobutamine stress echocardiography (DSE). BACKGROUND: The time required for segmental measurement of strain rate imaging (SRI) limits its feasibility for quantification of DSE. METHODS: Myocardial deformation was assessed at DSE in 197 patients, 76 with and 61 without coronary artery disease (CAD) at angiography, and 60 at low risk of CAD. Automated deformation analysis was based on velocity gradient and segment length methods of measuring longitudinal motion within a region of interest tracked through the cardiac cycle. Results were compared with independent wall motion scoring (WMS). Patients were randomly divided; group A (n = 69) established optimal cutoffs for the parameters and group B (n = 68) tested their accuracy. RESULTS: The feasibility of WMS exceeded that of both SRI methods at rest and at peak stress. In group A, the area under the receiver-operating characteristics curve of the peak systolic strain rate was 0.90 by both methods, and the optimal cutoffs for detection of CAD were -1.3 (velocity gradient) and -1.2 s(-1) (segment length). The areas under the receiver-operating characteristics curves for end-systolic strain were less (0.87) by both methods, with respective cutoffs of 9% and 8%. In group B, the velocity and segment length methods had respective sensitivities of 87% and 84% for SR, and 87% and 88% for end-systolic strain. Both significantly exceeded that of WMS in the same group (75%). CONCLUSIONS: Automated analysis of myocardial deformation at DSE is feasible and accurate, and may increase the sensitivity of expert conventional reading.
OBJECTIVES: We investigated the accuracy of automated analysis of myocardial deformation during dobutamine stress echocardiography (DSE). BACKGROUND: The time required for segmental measurement of strain rate imaging (SRI) limits its feasibility for quantification of DSE. METHODS:Myocardial deformation was assessed at DSE in 197 patients, 76 with and 61 without coronary artery disease (CAD) at angiography, and 60 at low risk of CAD. Automated deformation analysis was based on velocity gradient and segment length methods of measuring longitudinal motion within a region of interest tracked through the cardiac cycle. Results were compared with independent wall motion scoring (WMS). Patients were randomly divided; group A (n = 69) established optimal cutoffs for the parameters and group B (n = 68) tested their accuracy. RESULTS: The feasibility of WMS exceeded that of both SRI methods at rest and at peak stress. In group A, the area under the receiver-operating characteristics curve of the peak systolic strain rate was 0.90 by both methods, and the optimal cutoffs for detection of CAD were -1.3 (velocity gradient) and -1.2 s(-1) (segment length). The areas under the receiver-operating characteristics curves for end-systolic strain were less (0.87) by both methods, with respective cutoffs of 9% and 8%. In group B, the velocity and segment length methods had respective sensitivities of 87% and 84% for SR, and 87% and 88% for end-systolic strain. Both significantly exceeded that of WMS in the same group (75%). CONCLUSIONS: Automated analysis of myocardial deformation at DSE is feasible and accurate, and may increase the sensitivity of expert conventional reading.
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