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BACKGROUND: Ultraviolet blood irradiation and oxygenation (UBIO) has obtained better clinical effect in treating acute cerebral infarction, but the mechanism underlying this effect remains unclear.OBJECTIVE: To observe the effect of UBIO on the nerve function and activities of K+-Na+-ATPase and Ca2+-Mg2+-ATPase activities on the red blood cell (RBC) membrane of patients with acute cerebral infarction.DESIGN: A randomized and controlled study.SETTING: Department of Neurology, Xiangfan Central Hospital.PARTICIPANTS: From January 2000 to December 2001, excluding those above 70 years old, 58 cases of 700 patients with acute cerebral infarction admitted in the Department of Neurology, Xiangfan Central Hospital, were recruited and divided into two groups according to the random number table: UBIO treated group (n=28), including 17 males and 11 females, aged 40-68 years; and control group (n=30), including 20males and 10 females, aged 44-69 years. All the patients agreed to participate in the therapeutic program and detected items. The general informations were comparable without obvious differences between the two groups (P ＞ 0.05).METHODS: ① The patients in both groups received routine treatments, besides, those in the UBIO treated group were given UBIO treatment by using the XL-200 type therapeutic apparatus produced in Shijiazhuang, whose ultraviolet wave was set at 253.7 nm with the energy density of 0.568 J/m2 per second, UBIO treatment started from the second day after admission, once every other day, with a single course consisting of 5-7 treatments. ② In the UBIO treated group, the venous blood was sampled before and after the first, third and the completion of the treatment course respectively, the venous blood was taken at each corresponding time point in the control group. After centrifugation of the blood at 10 000 rounds per minute,the RBC membrane was separated and then the activities of K+-Na+-ATPase and Ca2+-Mg2+-ATPase were detected by means of phosphorus determination. ③ The nerve function was scored before and after treatment in both groups with European stroke scale, which included 13 items, the total score was 0-100 points,the higher the score, the better the nerve function.MAIN OUTCOME MEASURES: ① Score of European stroke scale before and after treatment in both groups.② Comparison of the activities of K+-Na+-ATPase and Ca2+-Mg2+-ATPase on RBC membrane between the two groups before treatment and after the first, third and the completion of the treatment.RESULTS: All the 58 patients with cerebral infarction were involved in the analysis of results. ① The score of European stroke scale had no obvious difference between the two groups [(49.31 ±11.48), (50.58±12.63),P ＞ 0.05], and it was obviously higher in the UBIO treated group than in the control group after treatment [84.66±13.75), (77.05±11.17), P ＜ 0.05]. ② The activity of K+-Na+-ATPase on RBC membrane in the UBIO treated group was significantly increased after the first and third treatment as compared with before treatment [(31.56±19.25), (27.64±15.83), (17.67±13.83), P ＜ 0.01], it was still higher after the completion of the treatment than before treatment without obvious difference [(20.86±14.53), P ＞ 0.05]. After the first and third treatment, it was obviously higher in the UBIO treated group than in the control group [19.31±11.88),(17.44±10.42), P ＜ 0.01]. ③ In the UBIO treated group, Ca2+-Mg2+-ATPase activity on RBC membrane significantly increased after the first treatment and remained higher than the pre-treatment level throughout the treatment [(27.49±14.72), (17.41 ±4.82), P ＜ 0.01]. The activity of Ca2+-Mg2+-ATPase on RBC membrane was markedly higher in the UBIO treated group than in the control group after after the first, third and the completion of treatment respectively [(24.83±12.88), (17.70±5.69); (28.08±13.44), (16.32±5.29);(17.42±6.04),P ＜ 0.05-0.01].CONCLUSION: The effect of UBIO treatment against acute cerebral infarction may be mediated by the increased K+-Na+ ATPase and Ca2+-Mg2+-ATPase activities on RBC membrane, which enhances the RBC transformation ability so as to lower RBC aggregation and correct high blood viscosity.