Abstract: Objective To investigate the change of peripheral blood CD₃₄⁺ cells and white blood cells(WBC)count in the patients with brain traumatic injury in convalescence stage during hyperbaric oxygen(HBO)treatment.Methods The peripheral blood CD₃₄⁺ cells and WBC count were measured in 11 patients with brain traumatic injury in convalescence stage who accepted HBO treatment before and 1,2,3,4,and 5 weeks during the treatment.Other 11 persons were measured once as controls.Results Compared with the controls,the number of CD₃₄⁺ cells showed normal in the 1st and the 3rd week,but increased in the 2nd and the 5th week in the HBO group(P<0.05).It was increased in the 5th week compared with that in the 1st and the 3rd week(P<0.05)in the treatment group.The number of WBC showed no significance and the patients' symptoms improved during the HBO treatment.Conclusion HBO can mobilize bone marrow derived stem cells marked by CD₃₄,which may participate in the restoration of brain traumatic injury in convalescence stage.

Key words: hyperbaric oxygen, brain traumatic injury, CD₃₄⁺ cells