Objective To retrieve, evaluate, and summarize evidence on preventive management of high output and dehydration in ileostomy patients from both domestic and international sources.

Methods Based on the "6S" evidence model, a top-down approach was employed to retrieve evidence on prevention and management of high output and dehydration in ileostomy patients. Databases searched included BMJ best practice, UpToDate, National Guideline Clearinghouse (NGC), National Institute for Health and Care Excellence (NICE), Scottish Intercollegiate Guidelines Network (SIGN), Registered Nurses' Association of Ontario (RNAO), Wound Ostomy and Continence Nurses Society (WOCNS), World Council of Enterostomal Therapists (WCET), Medlive Clinical Guidelines website, Joanna Briggs Institute (JBI), Cochrane Library, Embase, PubMed, Web of Science, CNKI, Wanfang Data, China Biology Medicine (CBM), and VIP Database. The search period was from January 2019 to April 2024.

Results A total of 13 articles were included after retrieval and screening, comprising 2 guidelines, 2 expert consensuses, 4 systematic reviews, 4 evidence summaries, and 1 clinical decision aid. After translation, summarization, and organization of the included articles, 19 pieces of evidence across 11 categories were formulated, focusing on four items: definition and risk factors of high output in ileostomy, prevention and management strategies related to high output in ileostomy, prevention and management strategies related to dehydration in high-output ileostomy, and follow-up strategies for prevention of high output and dehydration after ileostomy surgery.

Conclusion The evidence summarized based on the "6S" evidence model for prevention and management of high output and dehydration in ileostomy patients can provide a reference for clinical practice among healthcare professionals and medical decision-makers, thereby enhancing nursing quality and reducing patient rehospitalization rates.