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Aspirin interruption before neurosurgical interventions:A controversial problem

World Journal of Cardiology 2024年第4期16卷 191-198页

作者： alexander kulikov Anton Konovalov Pier Paolo Pugnaloni Federico Bilotta Department of Anesthesiology Burdenko National Medical Research Center of NeurosurgeryMoscow 125047Russia Department of Vascular Neurosurgery Burdenko National Medical Research Center of NeurosurgeryMoscow 125047Russia Department of Anesthesiology Critical Care and Pain MedicineUniversity of Rome“Sapienza”Rome 00161Italy

Aspirin is widely used for primary or secondary prevention of ischemic *** the same time,chronic aspirin consumption can affect blood clot formation during surgical intervention and increase intraoperative blood *** is especially important for high-risk surgery,including *** European Society of Cardiology guidelines recommend aspirin interruption for at least 7 d before neurosurgical intervention,but this suggestion is not supported by clinical *** narrative review presents evidence that challenges the necessity for aspirin interruption in neurosurgical patients,describes options for aspirin effect monitoring and the clinical implication of these methods,and summarizes current clinical data on bleeding risk associated with chronic aspirin therapy in neurosurgical patients,including brain tumor surgery,cerebrovascular procedures,and spinal surgery.

关键词： Aspirin Neurosurgery Postoperative complications Bleeding risk Brain tumor surgery Cerebrovascular surgery Spinal surgery

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Modelling soil erodibility in mountain rangelands of southern Kyrgyzstan

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Pedosphere 2020年第4期30卷 443-456页

作者： Maksim kulikov Udo SCHICKHOFF alexander GRONGROFT Peter BORCHARDT Centrum für Erdsystemforschung und Nachhaltigkeit(CEN) Center for Earth System Research and SustainabilityInstitute of GeographyUniversity of HamburgHamburg D-20146(Germany) Centrum für Erdsystemforschung und Nachhaltigkeit(CEN) Center for Earth System Research and SustainabilityInstitute of Soil ScienceUniversity of HamburgHamburg D-20146(Germany)

Soil erosion in mountain rangelands in Kyrgyzstan is an emerging problem due to vegetation loss caused by overgrazing. It is further exacerbated by mountain terrain and high precipitation values in Fergana range in the south of Kyrgyzstan. The main objective of this study was to map soil erodibility in the mountainous rangelands of Kyrgyzstan. The results of this effort are expected to contribute to the development of soil erodibility modelling approaches for mountainous areas. In this study, we mapped soil erodibility at two sites, both representing grazing rangelands in the mountains of Kyrgyzstan and having potentially different levels of grazing pressure. We collected a total of 232 soil samples evenly distributed in geographical space and feature space. Then we analyzed the samples in laboratory for grain size distribution and calculated soil erodibility values from these data using the Revised Universal Soil Loss Equation (RUSLE) K-factor formula. After that, we derived different terrain indices and ratios of frequency bands from ASTER GDEM and LANDSAT images to use as auxiliary data because they are among the main soil forming factors and widely used for prediction of various soil properties. Soil erodibility was significantly correlated with channel network base level (geographically extrapolated altitude of water channels), remotely sensed indices of short-wave infrared spectral bands, exposition, and slope degree. We applied multiple regression analysis to predict soil erodibility from spatially explicit terrain and remotely sensed indices. The final soil erodibility model was developed using the spatially explicit predictors and the regression equation and then improved by adding the residuals. The spatial resolution of the model was 30 m, and the estimated mean adjusted coefficient of determination was 0.47. The two sites indicated different estimated and predicted means of soil erodibility values (0.035 and 0.039) with a 0.05 significance level, which i

关键词： channel network base level K-factor LANDSAT RUSLE soil enhancement ratio soil mapping slope terrain

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