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The indications of NITs need to be identified. This study was designed to explore the indications for the insertion of NITs in patients with SBO and to suggest the optimal strategies for individuals based on the outcomes of SAEs.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>After propensity score matching, 68 pairs were included (Success group and failure group). The occurrence of SAEs and the clinical parameters were compared between the SAE group and the non-SAE group. Independent risk factors were evaluated among the subgroups. A novel scoring system was established to detect the subgroups that would benefit from NITs insertion.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Successful implementation of NITs could avoid hypochloremia (<jats:italic>p<\/jats:italic>\u2009=\u20090.010), SAEs (<jats:italic>p<\/jats:italic>\u2009=\u20090.001), pneumonia (<jats:italic>p<\/jats:italic>\u2009=\u20090.006). SAEs occurred in 13 of 136 (9.6%) patients who accepted NITs insertion treatment. Risk factors for SAEs included tumors (<jats:italic>p<\/jats:italic>\u2009=\u20090.002), reduced BMI (<jats:italic>p<\/jats:italic>\u2009=\u20090.048), reduced hemoglobin (<jats:italic>p<\/jats:italic>\u2009=\u20090.001), abnormal activated partial thromboplastin time (<jats:italic>p<\/jats:italic>\u2009=\u20090.015) and elevated white blood cells (<jats:italic>p<\/jats:italic>\u2009=\u20090.002). A novel risk scoring system consists of hemoglobin before NITs insertion (95% CI 0.685, 0.893) and bowel obstruction symptoms relieved after NITs insertion (95% CI 0.575, 0.900) had the highest area under curve for predicting the occurrence of SAEs. We divided the risk score system into 3 grades, with the increasing grades, the rates of SAEs surged from 1.3% (1\/74) to (6\/11) 54.5%.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>NITs successfully insertion could avoid SAEs occurrence in SBO conservative treatment. SBO patients without anemia and could be relieved after NITs insertion could be the potential benefit group for this therapy.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12876-022-02405-8","type":"journal-article","created":{"date-parts":[[2022,7,7]],"date-time":"2022-07-07T17:11:48Z","timestamp":1657213908000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Who would avoid severe adverse events from nasointestinal tube in small bowel obstruction? 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