[Analysis of the level of T lymphocyte subsets and the relationship with the prognosis of pulmonary fibrosis in patients with paraquat poisoning]

Objective: To analyze the levels of T lymphocyte subsets (CD3, CD4, CD8 and CD4/CD8) in patients with paraquat poisoning, and to explore the relationship between the changes of T lymphocyte subsets and the prognosis of pulmonary fibrosis. Methods: In October 2019, a total of 47 patients with oral 20% paraquat low water solvent poisoning in Guangzhou 12th people's Hospital from June 2018 to June 2019 were selected as the research objects. Patients were divided into early death group (16 cases died within 2 weeks) and non early death group (31 cases survived more than 2 weeks) . The non early death group was divided into pulmonary fibrosis group (23 cases) and normal lung group (8 cases) . 20 healthy people in the same period were randomly selected as the control group. The neutrophils (N) , C reaction protein (CRP) , alanine aminotransferase (ALT) , creatinine (Cr) , amylase (aAMY) , creatine kinase isoenzyme (CKMB) , pH, HCO(3)(-), blood oxygen saturation (SO(2)) and lactic acid (Lac) of patients poisoned within 3 d were examined every day. Independent sample t-test was used for inter group comparison, and paired sample t-test was used for intra group comparison. Results: Compared with non early death group, the levels of N, CRP, ALT, Cr, aAMY, CKMB and Lac in early death group increased (P<0.05) , while pH and HCO(3)(-) decreased (P<0.05) . Compared with the control group, the levels of CD3, CD4 and CD4/CD8 were decreased on the first day in the early death group and non early death group (P<0.05) , and the levels of CD3, CD4 and CD4/CD8 were decreased on the 15th day in the pulmonary fibrosis group (P<0.05) . Compared with the normal lung group, the levels of CD3, CD4 and CD4/CD8 in the pulmonary fibrosis group decreased on the 15th day (P<0.05) . Conclusion: The persistent low cellular immune function in patients with paraquat poisoning is related to the progress of pulmonary fibrosis, which is an important factor affecting the prognosis of patients with pulmonary fibrosis.

Differences in the effect of cigarette smoking on endothelial function in chinese and white adults

BACKGROUND

The prevalence of coronary artery disease in southern China is approximately one fifth that in "westernized" countries, even though approximately 70% of Chinese men smoke cigarettes and Chinese women have substantial passive exposure to cigarette smoke.

OBJECTIVES

Endothelial dysfunction is an early event in atherosclerosis and occurs in young white active and passive smokers; we compared endothelial physiology in healthy young Chinese and white smokers and nonsmokers.

PATIENTS

144 healthy adults who were 16 to 45 years of age: 72 Chinese persons in a village in southern China and 72 white persons in Australia and England who were matched for exposure to cigarette smoke. Each ethnic group comprised 36 controls (lifelong nonsmokers with no regular exposure to cigarette smoke; 16 men and 20 women) and 36 active or passive smokers (15 men and 21 women).

MEASUREMENTS

Arterial endothelial function was tested with high-resolution external vascular ultrasonography, and brachial artery diameter was measured at rest, after flow increase (which causes endothelium-dependent dilatation), and after administration of sublingual nitroglycerin (an endothelium-independent dilator).

RESULTS

Endothelium-dependent dilatation was similar in Chinese (7.9%) and white (8.4%) nonsmokers (P > 0.2). Among white persons, endothelium-dependent dilatation was lower in active or passive smokers (3.9%) than in nonsmokers (8.4%) (P < 0.001). Among Chinese persons, dilatation was not significantly lower in active or passive smokers (7.3%) than in nonsmokers (7.9%) (P > 0.2). Dilatation was higher in Chinese active or passive smokers (7.3%) than in white active or passive smokers (3.9%) (P < 0.001). Dilatation responses to nitroglycerin were similar in all groups (P = 0.17).

CONCLUSION

Young Chinese adults have less evidence of arterial endothelial dysfunction than young white adults with similar direct or indirect exposure to cigarette smoke.