ST Segment Elevation; ST Segment Depression . General Introduction to ST, T, and U wave abnormalities. Basic Concept: the specificity of ST-T and U wave abnormalities is provided more by the clinical circumstances in which the ECG changes are found than by the particular changes themselves. Thus the term, nonspecific ST-T wave abnormalities, is frequently used when the clinical data are not available to correlate with the ECG findings.
lutein â(usually uncountable, plural luteins) ( 1 organic chemistry) A yellow carotenoid pigment, widely distributed in both plants and animals. 2  E161b when used as a food colouring.  xanthophyll.
Lutein is a naturally-occurring carotenoid that is abundant in fruits and vegetables (especially dark, leafy green ones) and egg yolks, and it is highly concentrated in the macula of the eye, with smaller amounts found in the retina, lens, and optic nerve.esearch has also shown that lutein can lower risk of cataracts. For example, one study found that older women who had the highest levels of lutein (and zeaxanthin, another nutrient that is critical for vision health) were about a third less likely to have cataracts.