Tortuous arteries and veins are commonly observed in humans and animals. While mild tortuosity is asymptomatic, severe tortuosity can lead to ischemic attack in distal organs. Clinical observations have linked tortuous arteries and veins with aging, atherosclerosis, hypertension, genetic defects and diabetes mellitus. However, the mechanisms of their formation and development are poorly underst...

Arterial tortuosity syndrome (ATS) is a rare hereditary, autosomal recessive, connective tissue disorder. Herein, we describe a five-year-old boy. He had hyperextensible skin, atypical facial features and inguinal hernia. We present his vascular imaging studies of kinking and tortuosity of the aorta and bilateral multiple peripheral pulmonary artery stenoses determined by conventional and magne...

K. Klein, University of Toronto J. C. Santamarina, Georgia Institute of Technology The authors measured resistivity at various depths during the sedimentation of kaolinite in different ionic concentration fluids. They attributed a decreasing resistivity (increasing conductivity) with time in the low ionic concentration fluids to decreasing tortuosity. The authors suggested that the initial stru...

1. Forsius H, Arentz-Grastvedt B, Eriksson AW. Juvenile cataract with autosomal recessive inheritance: a study from the Aland Islands, Finland. Acta Ophthalmol (Copenh). 1992;70: 26-32. 2. Verrips A, van Engelen BG, Wevers RA, et al. Presence of diarrhea and absence of tendon xanthomas in patients with cerebrotendinous xanthomatosis. Arch Neurol. 2000;57:520-524. 3. Lorincz MT, Rainier S, Thoma...

Background: Vitamin B 12 deficiency has been implicated in endothelial dysfunction and cardiovascular disease via hyperhomocysteinemia. Coronary tortuosity (CorT) is a common coronary angiography finding. The etiology, clinical implication and long term prognosis are still not well clarified. This study was conducted with the aim to evaluate the relationship between CorT and vitamin B12. Subjec...

We show that gas diffusion nuclear magnetic resonance (GD-NMR) provides a powerful technique for probing the structure of porous media. In random packs of glass beads, using both laser-polarized and thermally polarized xenon gas, we find that GD-NMR can accurately measure the pore space surface-area-to-volume ratio, S/V rho, and the tortuosity, alpha (the latter quantity being directly related ...