Chronic intestinal failure and short bowel syndrome in Crohn’s disease

Figure 1 Four domains of chronic intestinal failure. Disease severity is defined by the content of the supplementation — fluid and electrolytes (FE) only, or admixture containing energy (parenteral nutrition (PN)). Each group is subdivided into four categories of mean daily intravenous supplementation (IVS), with volume calculated as average infusion volume per day × number of infusions per week/7.