Abstract: Objective To investigate the status quo of perceptive social support,sense of social connection and work withdrawal behavior among cardiothoracic surgery medical staff,and to explore the pathways between the three,so as to lay a foundation for further reducing work withdrawal behavior and making medical staff actively participate in work. Methods From February to March 2024,a total of 340 medical staff from the cardiothoracic surgery department of 10 tertiary general hospitals in Sichuan Province were included in the study by cluster sampling. The subjects were investigated by using perceptive social support scale,social connection scale and work withdrawal behavior scale,and the mediating role of social connection was verified. Results The scores of social connection,perceived social support,and work withdrawal behavior of cardiothoracic surgery medical staff in Sichuan Province were （69.21±14.09）,（44.56±11.01） and （35.42±7.88）points,respectively. Univariate analysis showed that there were statistically significant differences in perceived social support scores among cardiothoracic surgeons with different ages,average monthly income and employment types（all P<0.05）. There were statistically significant differences in social connection scores among cardiothoracic surgeons with different ages,average monthly income and employment types（all P<0.05）. There were statistically significant differences in work withdrawal behavior scores among cardiothoracic surgeons with different genders,practice categories,monthly income and employment forms（all P<0.05）. Pearson correlation analysis showed that social support was positively correlated with sense of social connection among surgical medical staff in Sichuan Province（r=0.510-0.748,all P<0.01）,and negatively correlated with work withdrawal behavior（r=-0.558--0.419,all P<0.01）. There was a negative correlation between social connection and work withdrawal behavior（r=-0.473--0.331,all P<0.01）. The sense of social connection played a partial mediating role in the perceived social support and work withdrawal behavior,with a mediation effect of 0.904,accounting for 18.7% of the total effect. Conclusions Cardiothoracic surgery medical staff's work withdrawal behavior is at an upper medium level,which needs to be further reduced. Social connection has a significant mediating effect between perceived social support and work withdrawal behavior of cardiothoracic surgery medical staff. Relevant managers should take active intervention measures to improve the perceived social support level of medical staff,in order to further enhance their sense of social connection and reduce the occurrence of work withdrawal behavior,so that they can engage in work with a more positive attitude.

Key words: Cardiothoracic surgery, Medical personnel, Perceived social support, Sense of social connection, Work withdrawal behavior, Mediating effect