Listening to sound of traumatic subcutaneous emphysema
After trauma, if there is a large area of diffuse swelling that is not coincident with the extent of trauma, it should be examined whether there is subcutaneous emphysema. When examining, one should part his fingers as a fan and gently knead the sick part, if there is special crepitant rales or crepitation, then, there is gas subcutaneously. For example, in the case of fracture of rib, if the end of fracture pricks the lung, it may result in subcutaneous emphysema due to endosmosis of gas into subcutaneous tissues.