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Articles in PresS, published online ahead of print February 28, 2002
Am J Physiol Heart Circ Physiol, 10.1152/ajpheart.00968.2001
Submitted on November 5, 2001
Accepted on February 20, 2002
1 Mechanical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
2 Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
3 Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands; Experimental in vivo NMR, Utrecht University, Utrecht, Netherlands
4 Biophysics, Maastricht University, Maastricht, Netherlands; Mechanical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
* To whom correspondence should be addressed. E-mail: l.geerts{at}tue.nl.
Cardiac myofiber orientation is a crucial determinant of the distribution of myocardial wall stress. Myofiber orientation is commonly quantified by helix and transverse angles. Accuracy of reported helix angles is limited. Reported transverse angle data are incomplete. We measured cardiac myofiber orientation post mortem in 5 healthy goat hearts using MR-Diffusion Tensor Imaging. A novel local wall bound coordinate system was derived from the characteristics of the fiber field. The transmural course of the helix angle corresponded to data reported in literature. The mean midwall transverse angle ranged from -12° ± 4° near the apex, to +9.0° ± 4° near the base of the left ventricle, which is in agreement with the course predicted by Rijcken et al using a uniform load hypothesis [18]. The divergence of the myofiber field was computed, which is a measure for the extent to which wall stress is transmitted through the myofiber alone. It appeared to be <0.07 mm-1 throughout the myocardial walls, except the fusion sites between left and right ventricle and the insertion sites of the papillary muscles.
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