肺保护策略机械通气的再评价

通常认为急性肺损伤/急性呼吸窘迫综合征(ALI/ARDS)患者应用肺保护策略机械通气可降低病死率,主要由于潮气量的降低。对已发表的随机对照研究再次分析,发现平台压与患者病死率明显相关。平台压低于30cmH2O时,潮气量可以在一定范围内增加,不影响患者预后。但选择小潮气量可能对病人有害。随机对照研究在试验设计、统计学分析、病人同质性等方面依然存在很多问题。从现有资料看,潮气量和平台压都很重要。     

心理弹性儿童的人际关系认知

探查儿童寻求信任性人际关系建立和向他人求助启动阶段的人际关系认知,检验心理弹性儿童是否比缺乏心理弹性儿童拥有更准确、快速的人际关系类型和更积极、快速的中性人际关系性质认知。利用自编人际关系类型认知和中性情境人际关系性质认知实验程序,对经由汇聚操作法筛选出的心理弹性儿童(99人)和缺乏心理弹性儿童(176人)实施实验,记录被试的反应结果和反应时。以年龄和性别为协变量,分别对两组儿童人际关系类型认知得分及反应时、中性情境人际关系性质认知得分及反应时进行组间差异的协方差分析。结果支持部分研究假设:心理弹性儿童人际关系类型认知总分显著高于缺乏心理弹性儿童;心理弹性儿童在中性情境下人际关系性质认知积极与消极维度总分、积极—消极连续体上的振幅均显著小于缺乏心理弹性儿童,但心理弹性儿童对中性情境人际关系性质认知更具积极偏向;两组儿童在所有任务指标上的平均反应时差异皆不显著。提示,儿童对人际关系类型的准确把握及对人际关系性质谨慎却相对积极的认知,可能是有效寻求和建立人际关系、获取社会支持资源以良好应对严重压力/逆境的重要主体性因素。     

Exploring the Underlying Processes Between Conflict and Knowledge Sharing: A Work‐Engagement Perspective1

By integrating work‐engagement theory with conflict framework, this paper presents a model to demonstrate how 2 types of conflict (task and relationship conflict) affect employees' knowledge sharing through 3 psychological states (experienced meaningfulness, experienced safety, experienced availability) and work engagement. Employees (N = 139) in 2 software development companies in China responded to a survey. The results show that task conflict improved 2 psychological states (experienced safety, experienced availability) and work engagement, which, in turn, increased knowledge sharing. Relationship conflict deteriorated the 3 psychological states and work engagement, which, in turn, affected knowledge sharing. Theoretical and applied implications of these findings are discussed.