Hyperbaric oxygen therapy delivers oxygen under pressure to body tissues. The combination of pressure and high partial pressures of oxygen are the primary treatment for decompression sickness and arterial gas embolism. This form of therapy is a very useful adjunct to medical and surgical care in other conditions such as radiation injury and hypoxic problem wounds. The oxygen speeds up new microscopic blood vessel growth in certain types of wound and improves the ability of white blood cells to kill germs.