[Exploring the association between mental stress, lymphocyte subset variations, and coronary lesion severity].

<b>Objectives:</b> This study aimed to explore the association between perceived mental stress (MS), lymphocyte subset variations, and coronary lesion severity in patients with coronary artery disease (CAD). <b>Methods:</b> Patients with CAD were enrolled in this study from September 2023 to May 2024. Perceived Stress Scale-14 (PSS-14) was used to evaluate MS during the last 1 month. Lymphocyte subsets were analyzed, including the percentage and absolute counts of CD3⁺, CD3⁺CD4⁺, CD3⁺CD8⁺, CD3^-CD19⁺, CD3^-CD56⁺16⁺, and the Th/Ts ratio. Statistical analysis was conducted using SPSS 24.0. <b>Results:</b> This study recruited patients with 323 CAD, with an average age of 61 (56, 68) years, including 203 males and 120 females. According to the PSS-14, a score of 14-42 and 43-70 were categorized as normal and increased MS, respectively. Patients with CAD with increased MS had significantly higher Gensini scores than those with normal MS [37(19,64) vs. 28(12,50), <i>Z</i>=-2.19,<i>P</i>=0.029]. Male CAD patients with increased MS exhibited significantly higher Gensini scores [39(20, 58) vs. 26(12, 45), <i>Z</i>=-2.37, <i>P</i>=0.018], levels of CD3⁺CD8⁺%[28.3%(23.6%,36.6%) vs. 25.9%(21.0%,32.4%), <i>Z</i>=-2.05, <i>P</i>=0.041], and CD3⁺CD8⁺absolute value [485 (346, 675) vs. 396 (309, 510) cells/μl, <i>Z</i>=-2.55,<i>P</i>=0.011] than those with normal MS. In male patients with CAD, a positive correlation was observed between Gensini scores (correlation coefficient: 0.181, <i>P</i>=0.011), PSS-14 scores, and CD3⁺CD8⁺absolute value (correlation coefficient: 0.162,<i>P</i>=0.038). <b>Conclusion:</b> This study reveals a positive correlation between MS and coronary stenosis severity, with notable sex differences. In male patients with CAD, higher levels of MS are associated with more severe coronary stenosis. The potential underlying mechanism may involve the regulation of lymphocyte subsets<b>.</b>