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ObjectiveThis study aimed to compare the effect of passive drainage and active suction drainage on complications after pancreatectomy.MethodsThe databases were searched and covered in this study on the comparison of passive and active suction drainage after pancreatectomy from the database establishment to Feb. 2023. A meta-analysis was conducted with the RevMan5.3 software.ResultsOn the whole, 1,903 cases were included in eight studies, including 994 cases in the passive drainage group, 909 in the active suction drainage group, 1,224 in the pancreaticoduodenectomy group, as well as 679 in the distal pancreatectomy group. No statistically significant difference was identified between the two groups in the incidence of total complications, the rate of abdominal hemorrhage, the rate of abdominal effusion, the death rate and the length of stay after pancreatectomy (all P > 0.05), whereas the difference in the incidence of pancreatic fistula after distal pancreatectomy between the two groups was of statistical significance (OR = 3.35, 95% CI = 1.12−10.07, P = 0.03). No significant difference was reported in pancreatic fistula between the two groups after pancreaticoduodenectomy.ConclusionAfter distal pancreatectomy, active suction drainage might down-regulate the incidence of postoperative pancreatic fistula.

To compensate for the defects of silica fume (SF), which aggravates drying shrinkage, and increase the strength and durability of cement mortar, it was modified using 1 wt% nanosilica (NS) or calcium sulfate whisker (CSW) compounded with 2 wt% SF. The strength, volume stability, and durability of the cement mortar were characterized using the compressive strength, drying shrinkage, and capillary water absorption. The physical composition and microstructure of the samples are discussed in detail based on thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy measurements. The combination of SF and NS increased the generation of C–S–H gels and reduced the total porosity, thus increasing the early strength of the cement mortar and decreasing the capillary water absorption. Notably, on combining SF and CSW, additional calcium aluminate hydrates (AFts) were generated, and the mesoporosity (10–50 nm) was reduced. The fibrous AFt phase increased the later strength of the cement mortar, and the presence of additional AFt increased the solid phase volume, which compensated for the drying shrinkage. [ABSTRACT FROM AUTHOR]

In this paper, calcium silicate hydrate (CSH) gel and calcium silicate hydrate doped with asphalt emulsion (EACSH) were synthesised using Na2SiO3•9H2O, Ca (NO3)2•4H2O, NaOH, deionised water and anionic asphalt emulsion. N2 isothermal adsorption, X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the effect of asphalt emulsion on morphology and porosity of CSH. The Frenkel–Halsey–Hill (FHH) model was used to analyse the surface fractal characteristics. The results showed that the asphalt emulsion had little effects on the change of specific surface areas and the distribution of the micropores for CSH gel, which may be related to the absence of the intercalation reaction and the "opening" effect. The asphalt emulsion could promote the formation of mesoporous hydrated calcium silicate and decreased the number of mesopores in CSH gel but had little effects on the macroporous and microporous structure of CSH. The calculation results of the FHH model showed that the fractal characteristics between CSH and EACSH were different. The emulsifier may adsorb CSH gels result in globular accumulation state. [ABSTRACT FROM AUTHOR]