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.
Special Sections. Lutein is a member of the carotenoid family, a group of powerful antioxidants that also includes beta-carotene, alpha-carotene, lycopene, and zeaxanthin. Lutein is a xanthophyll, which is a type of carotenoid found in high concentrations in dark-green, leafy vegetables and in egg yolks.