Clinical effects of different anesthesia methods in lateral episiotomy.

OBJECTIVES: To investigate the clinical effects of different anesthesia methods in lateral episiotomy. Providing the guidance of choosing the appropriate anesthesia method in clinical operation. METHODS: A total of 300 primiparas with vaginal delivery were enrolled into this study. These primiparas were divided into three groups (n=100, each), according to the different methods of anesthesia: group A (pudendal nerve block anesthesia + stepwise dissection and incisional local anesthesia), group B (bilateral pudendal nerve block anesthesia), and group C (pudendal nerve block anesthesia + local infiltration anesthesia). The pain score of these primiparas at the time of perineal dissection and suturing, as well as suturing time and bleeding volume, were observed and compared among these three groups. RESULTS: In respect of pain scores at the time of suturing in lateral episiotomy, maternal pain score was significantly lower in group A than in groups B and C; and the difference was statistically significant (P<0.05). In respect of the time required for suturing in lateral episiotomy, suturing time was shorter in group A than in groups B and C; and the difference was statistically significant (P<0.05). In respect of the bleeding volume in lateral episiotomy, maternal bleeding volume was lesser in group A than in groups B and C; and the difference was statistically significant (P<0.05). CONCLUSIONS: Among these three commonly used methods of anesthesia in lateral episiotomy, the pudendal nerve block anesthesia + stepwise dissection and incisional local anesthesia method used in group A had the best analgesic effect, the shortest suturing time, and the lowest wound blood loss. KEY WORDS: Lateral episiotomy, Pudendal nerve block anesthesia, Local anesthesia, Pain score.

Salvianolic acid A ameliorates the integrity of blood-spinal cord barrier via miR-101/Cul3/Nrf2/HO-1 signaling pathway.

Salvianolic acid A (Sal A), a bioactive compound isolated from the Chinese medicinal herb Danshen, is used for the prevention and treatment of cardiovascular diseases. However, the protective function of Sal A on preserving the role of blood-spinal cord barrier (BSCB) after spinal cord injury (SCI) is unclear. The present study investigated the effects and mechanisms of Sal A (2.5, 5, 10mg/kg, i.p.) on BSCB permeability at different time-points after compressive SCI in rats. Compared to the SCI group, treatment with Sal A decreased the content of the Evans blue in the spinal cord tissue at 24h post-SCI. The expression levels of tight junction proteins and HO-1 were remarkably increased, and that of p-caveolin-1 protein was greatly decreased after SCI Sal A. The effect of Sal A on the expression level of ZO-1, occluding, and p-caveolin-1 after SCI was blocked by the HO-1 inhibitor, zinc protoporphyrin IX (ZnPP). Also, Sal A inhibited the level of apoptosis-related proteins and improved the motor function until 21days after SCI. In addition, Sal A significantly increased the expression of microRNA-101 (miR-101) in the RBMECs under hypoxia. AntagomiR-101 markedly increased the RBMECs permeability and the expression of the Cul3 protein by targeting with 3'-UTR of its mRNA. The expression of nuclear factor erythroid 2-related factor 2 (Nrf2) and HO-1 was significantly increased after agomiR-101 treatment. Therefore, Sal A could improve the recovery of neurological function after SCI, which could be correlated with the repair of BSCB integrity by the miR-101/Cul3/Nrf2/HO-1 signaling pathway.

Sensitive determination of chloroanilines in water samples by hollow fiber-based liquid-phase microextraction prior to capillary electrophoresis with amperometric detection.

A hollow fiber-based liquid-phase microextraction method has been developed for enrichment of trace chloroanilines in water samples. Target analytes including aniline, three mono-chlorinated aniline isomers (o-chloroaniline, m-chloroaniline, and p-chloroaniline) and four mono-chlorinated methylaniline isomers (2-chloro-4-methylaniline, 3-chloro-4-methylaniline, 4-chloro-2-methylaniline, and 5-chloro-2-methylaniline) were determined by CE with amperometric detection after microextraction. Several factors that affect separation, detection, and extraction efficiency were investigated. Under the optimum conditions, eight aniline compounds could be well separated from other components coexisting in water samples within 25 min, exhibiting a linear calibration over three orders of magnitude (r > 0.998); the obtained enrichment factors were between 51 and 239, and the LODs were in the range of 0.01-0.1 ng/mL. The proposed method has been applied for the analyses of real environmental water and sewage samples with relative recoveries in the range of 83-108%.

Development of an immunoaffinity chromatography purification and ultra performance liquid chromatography tandem mass spectrometry method for determination of 12 sulfonamides in beef and milk.

A highly selective and sensitive method was developed for the simultaneous determination of 12 sulfonamides in beef and milk by immunoaffinity chromatography purification coupled to ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). The MS/MS conditions, UPLC mobile phase, injection solution, sample purification process, and matrix effect were studied to optimize the operating conditions. The limits of detection (LODs) of the instrument for the studied sulfonamides ranged from 0.4 to 2.0 µg L(-1), being 1.6-8.0 µg kg(-1) for beef and 1.8-6.4 µg kg(-1) for milk. The standard solution was diluted with blank beef or milk matrix for the construction of calibration curves, which had a linear range from 10 to 200 µg kg(-1) and regression coefficients higher than 0.990 (n=10) for all the studied sulfonamides. Samples spiked at 10, 20, and 100 µg kg(-1) showed recoveries above 70% and relative standard deviations below 10%.