[Effect of oxygen in different concentrations and free radical-anti-radical activity system in patients with chronic pulmonary insufficiency].

The study of free-radical processes elucidated concentrations of O2 producing a negative effect in chronic obstructive bronchitis sufferers with respiratory insufficiency (RI). In RI of the second and third degree concentration of inhaled O2 should not exceed 50%. In this concentration O2 toxicity is not evident, unbalance of the system free radical-antiradical activity is less pronounced, O2 transport from the lungs to the tissue reaches optimal level. A course of oxygen therapy (20 daily sessions lasting 30 min., 50% O2) is not toxic, promoted activation of SOD and alleviation of arterial hypoxemia.