Objective: To observe the changes of intestinal barrier function in patients with acute severe organophosphorus pesticide poisoning (ASOPP) and the effect of early enteral nutrition on them. Methods: A single-center, single-sample, prospective, randomized controlled clinical trial was conducted. A total of 50 patients with ASOPP were divided into 24 h enteral nutrition group (group A) and 48 h (48-72 h) enteral nutrition group (B group) according to the order of hospitalization. The two groups received equal calorie nutritional support, and Serum D-lactic acid (D-LA) and serum human diamine oxidase (DAO) were detected immediately after admission and at 48 h, 72 h and 144 h. At the same time, the worst value of APACHE-Ⅱ score was recorded, and the correlation between DAO, D-LA and APACHE-Ⅱ score was analyzed. The serum concentration of D-LA and DAO in 15 healthy adults were detected as healthy control group. Results: There was no statistical difference in gender, age, poisoning time and organophosphorus pesticide components between group A and B (P>0.05). The distribution of D-LA concentration in group A poisoned patients at admission, 48 h, 72 h and 144 h was (66±19) μg/L, (68±21) μg/L, (66±19) μg/L, (63±17) μg/L, while in group B they were (62±15) μg/L, (58±17) μg/L, (58±16) μg/L, (67±9) μg/L. There was no statistical difference between the two groups in D-LA concentration and that of healthy people [(67±17) μg/L, P>0.05]. The distribution of DAO concentration in group A poisoned patients at admission, 48 h, 72 h and 144 h was (2.1±0.6) μg/ml, (2.1±0.5) μg/ml, (2.2±0.4) μg/ml, (2.2±0.5) μg/ml, while in group B they were (2.1±0.5) μg/ml, (2.1±0.5) μg/ml, (2.2±0.5) μg/ml, (2.1±0.4) μg/ml. DAO concentration in the early stage of the intoxication of the two groups were higher than that of healthy people (0.1±0.0 μg/ml) (P<0.05). There is no statistical difference in DAO concentration between group A and B at different time points (P>0.05). The APACHEE-Ⅱ score of 48 hours and 72 hours in group A (12.2+1.7, 5.5+2.1) was significantly lower than that in group B (14.1+2.4, 8.2+2.6) (P<0.05). D-LA, DAO concentration at different time points was not correlated with APACHE-Ⅱ score (P>0.05). D-LA (r, P) was immediate admission (-0.17, 0.24), 48 h (0.04, 0.79), 72 h (0.32, 0.06), 144 h (0.29, 0.07), and DAO (r, P) was immediate admission (-0.12, 0.43), 48 h (0.02, 0.92), 72 h (0.03, 0.85), 144 h (0.03, 0.82). Conclusions: Patients with ASOPP may have obvious injury at intestinal mucosa at early stage (144 h), but the intestinal permeability is normal. Early enteral nutrition therapy can promote the recovery of patients, but has low correlation with intestinal barrier function improvement.

Hodlevsk'kyĭ Ai

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