Medically termed sinusitis, a sinus infection occurs when the cavities around your nose become swollen and inflamed. Sinusitis is most often caused by a virus and often lasts long after the other upper respiratory symptoms are gone. Rarely, fungus or bacteria may cause a sinus infection.
The inner coat is double with one layer closely adherent to the heart while the other lines the inner surface of the outer coat with the intervening space being filled with fluid. This small amount of fluid, the pericardial fluid, acts as a lubricant to allow normal heart movement within the chest.
If a chronic fluid accumulation occurs, the pericardial sac may hold as much as _____ before the signs of cardiac tamponade will appear. 200 ml 400 ml 1000 ml 2000 ml. 2000 ml In a chronic condition, as much as 2000 ml of fluid may collect in the pericardial sac before symptoms appear.