Construction and validation of a nomogram prediction model for postoperative recurrence of lumbar disc herniation treated with percutaneous laminectomy.

The aim was to investigate the independent risk factors for postoperative recurrence of lumbar disc herniation treated by percutaneous intervertebral laminectomy, and to establish a nomogram prediction model accordingly. Data on patients with lumbar disc herniation were collected from January 2018 to December 2023 in our hospital, and single-factor and multifactorial logistic regression analyses were used to determine the independent risk factors for postoperative recurrence of lumbar disc herniation and establish the corresponding nomogram. The receiver operating characteristic curves were plotted the area under the curve was calculated, and the calibration curves and decision curves were plotted to evaluate the model performance.

The Value of Neutrophil-to-Lymphocyte Ratio in Predicting Mortality After Transjugular Intrahepatic Portosystemic Shunt Placement.

Background And Aims: The objective of this study was to investigate the effect of neutrophil-to-lymphocyte ratio (NLR) on the survival of cirrhotic patients with esophagogastric variceal bleeding (EGVB) treated with transjugular intrahepatic portosystemic shunt (TIPS).

Methods: A total of 293 patients treated with TIPS were included. The receiver operator characteristic curve (ROC) was used to calculate the optimal cut-off values of parameters such as NLR.

Preparation of poly(trimethyl-2-methacroyloxyethylammonium chloride-co-ethylene glycol dimethacrylate) monolith and its application in solid phase microextraction of brominated flame retardants.

A capillary poly(trimethyl-2-methacroyloxyethylammonium chloride-co-ethylene glycol dimethacrylate) monolith was in situ synthesized by thermally initiated free radical co-polymerization using trimethyl-2-methacroyloxyethylammonium chloride (MATE) and ethylene glycol dimethacrylate (EGDMA) as functional monomer and cross-linker, respectively. N,N-dimethylformamide and polyethylene glycol 6000 were used as solvent and porogen, respectively. The morphology and porous structure of the resulting monoliths were assessed by scanning electron microscope.

A practical interface designed for on-line polymer monolith microextraction: synthesis and application of poly(4-vinylpyridine-co-ethylene glycol dimethacrylate) monolith.

A simple and facile needle-adapter was designed for constructing manual on-line polymer monolith microextraction-high performance liquid chromatography (PMME-HPLC). A capillary poly(4-vinylpyridine-co-ethylene glycol dimethacrylate) [poly(VP-co-EGDMA)] monolith was prepared by in situ polymerization, using 4-vinylpyridine (VP) and ethylene glycol dimethacrylate (EGDMA) as functional monomer and cross-linker, respectively. The synthesized monolith was used as the extraction medium for concentrating four EPA priority pollutants, 2-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol, from water samples.