In the patients with a severely dilated tricuspid anulus (>/=50 mm), the postoperative change of tricuspid regurgitation differed between those patients with valvular heart disease and atrial septal defects.
Abstract. Complex cubic compounds Zn 6 Sc and Cd 6 M (M ¼ Yb, Ca, Y, rare earth) are approximant crystals of Zn-and Cd-based quasicrystals. A low-temperature structural transition has been observed for these compounds universally and is considered to be due to orientational ordering of an atomic shell in the icosahedral cluster. To get microscopic information on structure and orientational ordering of the atomic shell in the icosahedral cluster, the first-principles structural relaxation for Zn 6 Sc is carried out. We obtain variety of favorable structures for different lattice constants. The results are compared with those for isostructural Cd 6 Ca obtained in the previous work. We stress differences between Zn 6 Sc and Cd 6 Ca and discuss their possible consequences on phase diagrams.
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