Employee exposure to bloodborne pathogens from blood and Other Potentially Infectious Materials (OPIM) because employees are not using Universal Precautions. 1  Bloodborne pathogens are pathogenic microorganisms that are present in human blood and can cause disease in humans.
atonality. n. 1. (Music, other) absence of or disregard for an established musical key in a composition. 2. (Music, other) the principles of composition embodying this and providing a radical alternative to the diatonic system.
atrial fibrillation, n a heart condition characterized by rapid random contractions of the atria at the rate of 130 to 150 ventricular beats per minute. fibrillation. 1. a small, local, involuntary, muscular contraction, due to spontaneous activation of single muscle cells or muscle fibers.