Key result
Multidetector CT strain analysis detected abnormal radial strain in swine cardiomyopathy models, showing moderate agreement with cardiac MR in the radial direction (r=0.55, P=0.03).
Why the study?
Does multidetector CT strain analysis accurately detect regional wall-motion abnormalities in a swine cardiomyopathy model compared to tagged cardiac MR?
Does multidetector CT strain analysis accurately detect regional wall-motion abnormalities in a swine cardiomyopathy model compared to tagged cardiac MR?
Multidetector CT strain analysis can identify regional wall-motion abnormalities in cardiomyopathy that are missed by conventional metrics, showing moderate agreement with tagged cardiac MR.
Answers are grounded in this paper and cite their sources.
CT strain may detect subtle radial abnormalities in animal cardiomyopathy models; leaves open human validation versus MR.
PURPOSE: To investigate the use of cine multidetector computed tomography (CT) to detect changes in myocardial function in a swine cardiomyopathy model. MATERIALS AND METHODS: All animal protocols were in accordance with the Principles for the Utilization and Care of Vertebrate Animals Used in Testing Research and Training and approved by the University of Missouri Animal Care and Use Committee. Strain analysis of cine multidetector CT images of the left ventricle was optimized and analyzed with feature-tracking software. The standard of reference for strain was harmonic phase analysis of tagged cardiac magnetic resonance (MR) images at 3.0 T. An animal model of cardiomyopathy was imaged with both cardiac MR and 320-section multidetector CT at a temporal resolution of less than 50 msec. Three groups were evaluated: control group (n = 5), aortic-banded myocardial hypertrophy group (n = 5), and aortic-banded and cyclosporine A- treated cardiomyopathy group (n = 5). Histologic samples of the myocardium were obtained for comparison with strain results. Dunnett test was used for comparisons of the concentric remodeling group and eccentric remodeling group against the control group. RESULTS: Collagen volume fraction ranged from 10.9% to 14.2%; lower collagen fraction values were seen in the control group than in the cardiomyopathy groups (P < .05). Ejection fraction and conventional metrics showed no significant differences between control and cardiomyopathy groups. Radial strain for both cardiac MR and multidetector CT was abnormal in both concentric (cardiac MR 25.1% ± 4.2; multidetector CT 28.4% ± 2.8) and eccentric (cardiac MR 23.2% ± 2.0; multidetector CT 24.4% ± 2.1) remodeling groups relative to control group (cardiac MR 18.9% ± 1.9, multidetector CT 22.0% ± 1.7, P < .05, all comparisons). Strain values for multidetector CT versus cardiac MR showed better agreement in the radial direction than in the circumferential direction (r = 0.55, P = .03 vs r = 0.40, P = .13, respectively). CONCLUSION: Multidetector CT strain analysis has potential to identify regional wall-motion abnormalities in cardiomyopathy that is not otherwise detected using conventional metrics of myocardial function.
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Tee et al. (2015) studied Cardiomyopathy (n=15). Multidetector CT strain analysis vs. Cardiac MR tagging was evaluated on Agreement of radial strain values between multidetector CT and cardiac MR (r = 0.55, p=0.03). Multidetector CT strain analysis detected abnormal radial strain in swine cardiomyopathy models, showing moderate agreement with cardiac MR in the radial direction (r=0.55, P=0.03).
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