1 AFib reduces the ability of the atria to pump blood into the ventricles, and usually causes the heart to beat too rapidly. 2  One-half million new cases of atrial fibrillation are diagnosed every year in the U.S., and billions of dollars are spent annually on its diagnosis and treatment.
noun, (used with a singular verb) 1. the branch of mechanics that deals with the motion of air and other gases and with the effects of such motion on bodies in the medium. Compare aerostatics (def 1). Origin of aerodynamics.
n. 1. a sheltered part or side; the side away from the direction from which the wind is blowing. 2. (Nautical Terms) by the lee nautical so that the wind is blowing on the wrong side of the sail. 3. (Nautical Terms) under the lee nautical towards the lee. adj.4. (Nautical Terms) nautical (prenominal) on, at, or towards the side or part away from the wind Compare weather 5: on a lee shore.. (Nautical Terms) by the lee nautical so that the wind is blowing on the wrong side of the sail. 3. (Nautical Terms) under the lee nautical towards the lee. adj. 4. (Nautical Terms) nautical (prenominal) on, at, or towards the side or part away from the wind Compare weather 5: on a lee shore.