A Gamow bag is a portable, inflatable pressure chamber used as an emergency treatment for High-Altitude Cerebral Edema  when immediate descent isn’t possible. The patient is placed inside the sealed bag, which is then inflated with a foot pump to simulate the air pressure of a much lower altitude. This increases the amount of oxygen available to the body and helps reduce brain swelling and improve symptoms such as confusion and poor coordination. Relief is usually temporary, but it can stabilize the person until descent or evacuation becomes possible. The Gamow bag is especially useful in remote or high-mountain settings where oxygen and medical care are limited.