Define nadir. nadir synonyms, nadir pronunciation, nadir translation, English dictionary definition of nadir. n. 1. Astronomy A point on the celestial sphere directly below the observer, diametrically opposite the zenith. 2. The lowest point: the nadir of their...
Annular tear â definition and causes. By Michael Perry, M.D. An annular tear is one of the most common degenerative spine conditions that develop with the natural aging process of the spine. In fact, many people over the age of 50 have an annular tear and never know it.
Mitral annular calcification. From Wikiecho. Mitral annular calcification is common in the elderly and in the mild form isolated to the LV side of the posterior annulus. This can result in mild to moderate Mitral regurgitation, due to the rigidity of the annulus.itral annular calcification. From Wikiecho. Mitral annular calcification is common in the elderly and in the mild form isolated to the LV side of the posterior annulus. This can result in mild to moderate Mitral regurgitation, due to the rigidity of the annulus.