Objective To observe and compare the effects of four methods of anesthesia in patients with anorectal surgery.Methods One hundred patients with anorectal surgery were equally divided into the group Ⅰ (low-dose epidural anesthesia),group Ⅱ (epidural anesthesia),group Ⅲ (caudal) and group Ⅳ (local anesthesia) based on a random draw principles,each group of 25 cases.The onset time of anesthesia,patient satisfaction,postoperative adverse reaction and hemodynamics were observed in the 4 groups.Results The anesthesia onset time in the group Ⅰ and group Ⅳ were (4.12 ±2.11) min and (3.69 ±1.11) min,significantly shorter than group Ⅱ and group Ⅲ ((10.34 ±3.10) min and (12.55±3.23) min,P＜0.05).Anesthesia satisfaction of four groups were 96.0％ (24/25),84.0％ (21/25),64.0％ (16/25) and 40.0％ (10/25),the differences among 4 groups were statistically significant (P＜0.05),and the anesthesia satisfaction of guoup Ⅰ was the best.Four groups of postoperative urinary retention difference were not statistically significant (P＞0.05),but the postoperative nausea and vomiting(n =3),referred pain (n =12),headaches (n=4) and other adverse events in the group Ⅳ were significantly higher than the other 3 groups(P＜0.05).Differences between-groups and inner-group were not statistically significant of the intraoperative mean arterial pressure,oxygen saturation and pulse rates of the four groups (P＞ 0.05).Conclusion Compare to other anesthetic methods,low-dose epidural anesthesia in anorectal surgery applications with faster onset time of anesthesia and anesthesia satisfaction results,it has litter adverse reactions and maintain stable hemodynamics body,worthy applications.

As the severe acute respiratory syndrome-coronavirus-2(SARS-CoV-2)pandemic continues to spread globally,its genome is undergoing mutations and evolution,giving rise to various strains such as α,β,γ,and δ.Therefore,the continuous development of drugs and vaccines targeting the various strains has become pivotal to addressing the COVID-19 pandemic.Establishing animal models of SARS-CoV-2 enables study of the pathogenesis of the virus and is crucial for evaluating the efficacy of drugs and vaccines against SARS-CoV-2.However,commonly used animal models such as mice exhibit limited susceptibility to wildtype SARS-CoV-2 infection,underscoring the urgent need for animal models that can be infected with the novel coronavirus and better simulate the human pathological and physiological conditions.This review summarizes the animal models used to study SARS-CoV-2 infection and transmission,and their progress in characterizing the viral immunopathology.