INTESTINAL SQUEEZE

pain and possible injury to the small or large intestine caused by expansion of trapped gases when a pilot or underwater diver goes from areas of greater pressure to areas of less pressure. Under normal atmospheric conditions, intestinal discomfort can be felt when air or gas collects in the intestines. Relief is obtained by expelling the gas when it begins to expand the intestinal walls. When a pilot ascends from normal land environments to higher altitudes, the pressures exerted upon the body are reduced. Gases in the body expand proportionally to the reduction in pressure. Swallowed air or gases formed by the breakdown of food products, if not expelled by burping or by expelling gas through the anus, will distend the intestines. On the other hand, divers, as they descend underwater, experience an increasing amount of pressure, which compresses the gases within their bodies. As a diver returns to the surface, however, bodily gases begin to expand. If a diver swallows air while at depth or if food products produce gases, he is confronted with the same situation as the pilot when pressure is reduced. The usual symptoms are a bloated feeling and pain. If the gas cannot be relieved, the intestinal tissue may rupture or the pain may be severe enough to cause fainting. Intestinal squeeze can be avoided in many cases by selecting a diet before working that does not usually cause intestinal gas. Carbonated beverages, cabbage, beans, fruits, nuts, and spicy foods are thus to be avoided. See also decompression sickness.