Objective:To investigate the impact of hospital-based nutritional practices on weight gain in neonates during the immediate postoperative period.Methods:It is a retrospective study of 45 neonates who underwent modified systemic-to-pulmonary artery shunt in Huai'an First People's Hospital.We reviewed the weight-for-age Z-score (WAZ score) at the time points of the date of surgery,transfer from cardiac intensive care unit (CICU) to general ward,and day of hospital discharge.Caloric intake (calories/kg/day) and total fluid intake (ml/kg/day) at different time points were measured too.We also reviewed the initiation time of enteral feeding and CICU stay (days) postoperatively.Results:An overall median WAZ score decrease of-1.3 (IQR-1.7 to-0.7) from time of shunt palliation to hospital discharge.A length of stay of ＞5 days in the CICU,initiation of enteral feeding beyond the postoperative days (POD) 5 and the severity of diseases were significantly associated with a great mean difference in WAZ score(P ＜ 0.001,P ＜ 0.001,P =0.003).Conclusion:The nutrition support in immediate postoperative period is substantially lower than what is needed;initiation time of enteral feeding,a length of stay ＞ 5 days in the CICU and the severity of diseases were independent predictors of a greater change in WAZ score.

Gas chromatography (GC) is mainly used to detect the levels of short-chain fatty acids (SCFAs), but with the deepening of research,the drawbacks of GC have become more and more obvious in the fields of food,chemical engineering and clinical application. The analysis on existing research results showed that ultra performance convergence chromatography (UPC²) was appropriate for the analysis of lipid metabolism. The UPC² is a new kind of chromatographic separation technology developed in recent five years and the level of SCFAs is associated with the research on multiple diseases. Therefore,application of UPC² in the detection of SCFAs would be helpful for the scholars at home and abroad to carry out deeper researches,and also helpful to guide the treatment for various metabolic disorders. In this paper,the researches on SCFAs in recent ten years were reviewed; the shortcomings of GC and liquid chromatography (LC) in the detection of SCFAs were reviewed; the development process,basic characteristics and research status of UPC² at home and abroad were introduced; feasibility and innovation of UPC² in the detection of SCFAs were summarized. Pretreatment methods for UPC² application to the detection of SCFAs in feces or serum were collected; the problems that should be noticed during the process of sample pretreatment were pointed out; meanwhile, an research outlook on methodology of UPC² application in the detection of SCFAs was conducted. The effects of extracting solvent,mobile phase,and auxiliaryt solvent on chromatographic behavior as well as the physicochemical property, type and choice of UPC² chromatographic column were mainly discussed in this paper. In addition, the choices of basic modifier,acid modifier,and salinity modifier were briefly outlined, in order to provide efficient,simple,environmental,and economic detection technologies for the research on SCFAs, and provide better reference solutions for the rapid detection of massive clinical samples.