Objective To analyze the cunent situation and latent profiles of nurses'perceived organizational support,and explore the influencing factors of different types.Methods Through convenience sampling,a total of 1,860 nurses from the Pearl River Delta,Northern Guangdong,Eastern Guangdong and Western Guangdong regions of Guangdong Province were selected for the survey between October and December 2023.The demographic questionnaire,the Perceived Organizational Support Scale,and the Psychological Resilience Scale were used for investigation.The latent profiles of the nurses'perceived organizational support,the influencing factors of latent profiles were identified by single-factor analysis and multivariate Logistic regression.Results The score of the items of the perceived organizational support in l,819 nurses is(3.47±0.88)scores.Nurses perceived organizational support is divided into 3 latent classes,namely"poor group"(10.1％),"balanced group"(44.4％),and"rich group"(45.5％).The influencing factors include recruitment type,hospital level,and psychological resilience(all P＜0.05).Conclusion The perceived organizational support among nurses is moderately high and heterogeneous,which could be divided into 3 latent profiles.Nursing managers should focus on nurses from the poor group and balanced group and intervene with nurses according to the influencing factors of the different latent profiles to improve the level of nurses perceived organizational support.

Objective To analyze the cunent situation and latent profiles of nurses'perceived organizational support,and explore the influencing factors of different types.Methods Through convenience sampling,a total of 1,860 nurses from the Pearl River Delta,Northern Guangdong,Eastern Guangdong and Western Guangdong regions of Guangdong Province were selected for the survey between October and December 2023.The demographic questionnaire,the Perceived Organizational Support Scale,and the Psychological Resilience Scale were used for investigation.The latent profiles of the nurses'perceived organizational support,the influencing factors of latent profiles were identified by single-factor analysis and multivariate Logistic regression.Results The score of the items of the perceived organizational support in l,819 nurses is(3.47±0.88)scores.Nurses perceived organizational support is divided into 3 latent classes,namely"poor group"(10.1％),"balanced group"(44.4％),and"rich group"(45.5％).The influencing factors include recruitment type,hospital level,and psychological resilience(all P＜0.05).Conclusion The perceived organizational support among nurses is moderately high and heterogeneous,which could be divided into 3 latent profiles.Nursing managers should focus on nurses from the poor group and balanced group and intervene with nurses according to the influencing factors of the different latent profiles to improve the level of nurses perceived organizational support.

Objective Using event-related potentials(ERPs),to study the effect and mechanism of negative emotion accumulation hepatic insufficiency on working memory in normal people.Methods Fifty subjects in each of the emotionally stable group and emotionally unstable group were given two load tasks(0-back and 1-back)in the N-back paradigm,the reaction time and correct rate were recorded,and the ERPs components N200 and P300 were detected.The latency and amplitude of P300 were analyzed statistically.Results ①Compared with the emotionally stable group,the emotionally unstable group had a longer reaction time(P<0.05).②Compared with the emotionally stable group,the subjects in the emotionally unstable group had prolonged N200 latency,decreased P300 amplitude significantly(P<0.05),and P300 latency had a tendency to extend(P<0.1).Conclusion Long-term accumulation of negative emotions and liver failure in normal people have the performance of decreased working memory,which may be related to the reduction of attention resource allocation and the impairment of cognitive processing function.

Objective:To study the effects of rolling blood pump parameters and blood concentration on hemolysis during extracorporeal circulation.Methods:According to the extracorporeal hemolysis experiment standard, an extracorporeal circulation experimental device was built to analyze the influences of circulation time (0 ~ 90 min), blood flow rate (1~4 L/min), and blood volume fraction (60%, 70%) on the hemolysis of blood samples in the circulatory system. The results of hemolysis were analyzed using first-order linear regression.Results:The longer the blood pump circulation time, the greater the hemolysis rate; the higher the blood flow rate, the greater the hemolysis rate. When the flow rate is 1 and 2 L/min, the hemolysis rate curve has an inflection point that changes with time, i.e. when the circulation time exceeds 30 min, the slope of the hemolysis rate curve suddenly increases. However, when the flow rate is 3 and 4 L/min, the hemolysis mutation phenomenon is not obvious. Compared to the blood sample with blood volume fraction of 70%, a blood sample with a blood volume fraction of 60% is less prone to hemolysis.Conclusions:The longer the blood pump circulation time and the higher the blood flow rate, the more easily the red blood cells are destroyed, i.e. the hemolysis rate is directly proportional to the circulation time and blood flow rate. When the circulation time increases to a certain degree, an inflection point appears in the hemolysis rate curve, and the hemolysis trend will be significantly enhanced.