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• W2022195100 abstract "Recent computational models of optimized left ventricular (LV) myofiber geometry that minimize the spatial variance in sarcomere length, stress, and ATP consumption have predicted that a midwall myofiber angle of 20° and transmural myofiber angle gradient of 140° from epicardium to endocardium is a functionally optimal LV myofiber geometry. In order to test the extent to which actual fiber angle distributions conform to this prediction, we measured local myofiber angles at an average of nine transmural depths in each of 32 sites (4 short-axis levels, 8 circumferentially distributed blocks in each level) in five normal ovine LVs. We found: (1) a mean midwall myofiber angle of −7° (SD 9), but with spatial heterogeneity (averaging 0° in the posterolateral and anterolateral wall near the papillary muscles, and −9° in all other regions); and (2) an average transmural gradient of 93° (SD 21), but with spatial heterogeneity (averaging a low of 51° in the basal posterior sector and a high of 130° in the mid-equatorial anterolateral sector). We conclude that midwall myofiber angles and transmural myofiber angle gradients in the ovine heart are regionally non-uniform and differ significantly from the predictions of present-day computationally optimized LV myofiber models. Myofiber geometry in the ovine heart may differ from other species, but model assumptions also underlie the discrepancy between experimental and computational results. To test the predictive capability of the current computational model would we propose using an ovine specific LV geometry and comparing the computed myofiber orientations to those we report herein." @default.
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• W2022195100 date "2008-11-01" @default.
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• W2022195100 title "Myofiber angle distributions in the ovine left ventricle do not conform to computationally optimized predictions" @default.
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• W2022195100 doi "https://doi.org/10.1016/j.jbiomech.2008.08.007" @default.
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