Objective To investigate the detection of central venous oxygen saturation ( ScvO2 ) whether can be alternative mixed venous oxygen saturation ( SvO2 ) in elderly patients with acute left ventricular failure.Methods 42 elderly patients with acute heart failure were detected by central venous oxygen saturation and mixed venous oxy-gen saturation before the treatment and 1h,2h,4h after treatment.Then the parameters index changes were analyzed according to the prognosis.Results Whatever the prognosis of the patients were,the trend of ScvO2 and SvO2 was the same.Before the treatment,the blood oxygen saturation detected by the ScvO2 with patients was no statistical differ-ence with the ScvO2(t=0.867,P>0.05),and after treatment of 4h the change trend detected of both has also the consistency,no statistical difference (t=0.681,P>0.05) The correlation coefficient r=0.998,and the relationship between ScvO2 and SvO2 confirmed the same clinical significance.Conclusion Considering the factors of trauma, complications,costs and so on,ScvO2 can be used to replace SvO2 in elderly patients with acute left heart failure.

Objective To explore the relationship between perceived stress and suicidal ideation as well as the mediating effect of resilience and depression.Methods A sample of 875 college students was recruited for the study to complete a set of self-report measures of Chinese Perceived Stress Scale(CPSS),the Resiliency Scale of University Students,Suicidal Ideation Questionnaire,and Beck Depression Inventory(BDI).Results ①College students'perceived stress and depression had significantly positive correlation with their suicidal ideation,while the students'resilience had a significantly negative correlation with their perceived stress and depression.②Perceived stress did not affect suicidal ideation of the college students directly,but indirectly affected their suicidal ideation through three significant mediating pathways:the separate mediating effects of(a)resilience and(b)depression,and the serial mediating effect of(c)resilience and depression.Conclusion Resilience and depression exert a chain mediating effect between perceived stress and suicidal ideation of college students.