What are pericardial tamponade, myocardial contusion, flail chest?

See below: Pericardial tamponade is a serious emergency problem of fluid or blood collection in the sac around the heart, causing heart dysfunction. Myocardial contusion is a potentially serious condition of direct trauma and bruising of the heart muscle. Flail chest is a serious problem of multiple rib fractures in several locations on one side of the chest resulting in the lung to not expand correctly.