Spatial Analysis has been used since the early 1990's for rural cadastral models. Nowadays, it is necessary to use Geographic Information Systems (GIS), Global Positioning Systems (GPS) and Cartography as well as dedicated software in order to solve problems in Cadastral Models. Among these models, the selection and priorítization of the parameters affecting the rural property valuation assets, as well as the zoning optimization (homogeneous sectors) within a community, are one of the biggest concems for Cadastral Agencies. This research is focused on rural property in the Región of Murcia, in accordance with data recorded from 2007 to 2009. The techniques used for the spatial zoning were carried out by means of IDW (Inverse Distance Weighting) and kriging interpolators as they are the most widely used in spatial varíation analysis studies. Although both interpolators produced similar results, IDW was better for predicting varíation in "Unit Príces". Afterwards, a statistical study was later completed using ANOVA, Chi-Squared and Correspondence Analysis procedures. The research results demónstrate the consistency of the parameters that have been used in the Cadastral Agencies, and the degree of involvement of these parameters in assessing the results of unit pnces for different áreas. These results are secured by the verification techniques appüed Keywords Geographicinformation system (GIS) • Spatialinterpolation • IDW-Kriging • Multivariate statistical • Cadastre
Spatial Analysis has been used slnce the 1990s for hedonlc cadastral models of urban áreas ¡n large cities. Thls research alms to apply spatial analysis to zoning a dlstrlct ¡n Madrid located ¡n the central part of the city ¡n order to estímate urban housing prices. In dolng so, the necessary data have been gathered, both vector and ráster, as found on the official government webslte and prívate company websites. Thls was done firstly to analyse the characteristics and then for the objectlves of the study because it ¡s helpful to use these types of analyses based on vector and ráster data along with Interpolaron methods that obtaln regular structures and attempt to avold the subjective component ¡nherent to traditlonal procedures.The essence of the work conslsted of studying the mínimum parameters that ¡nfluence housing appralsals to resolve the problem. Normally, cadastral appralsal work fulfils the Official Technlcal Regulatlons in each country consldering a greater number of parameters and correctlve coefficients. The ¡mportance of this work conslsted of lowerlng and priorltislng the number of baslc parameters necessary to set urban housing prices. The concluslons section confirms a high llkellhood of successfully reduclng the number of parameters to achieve an appralsal valué that ¡s similar to the one obtalned using official methods.
Background The applicability of free flap reconstruction for lower extremity (LE) defects in high-risk patients continues to require ongoing review. The aim of this study was to analyze the risk factors, management, and outcome of LE free flap reconstruction in high-risk (American Society of Anesthesiologists [ASA] class 3 or 4) patients.
Patients and Methods A retrospective chart review was performed for all patients who underwent LE reconstruction in our Institution (Level I Trauma Center) from 2013 to 2019. Medical records and the authors' prospectively maintained database were analyzed with respect to ASA class, comorbidities, and postoperative complications. All patients were treated using the same pre-, intra-, and postoperative multidisciplinary approach.
Results A total of 199 patients were analyzed. Sixty-six flaps were transferred in 60 patients with an ASA class 3 or higher. High-risk patients did not present a higher rate of flap loss or LE amputation. The overall flap success rate was 92%. There were five flap losses in high-risk patients. Three of these five patients underwent a successful second free flap reconstruction. The overall success rate of LE reconstruction in high-risk patients was 90%. Four patients with successful free flap ended up in LE amputation due to bone infection and two patients underwent an amputation after the first free flap failure.
Conclusion Free flap reconstruction for LE defects in high-risk patients is a safe and reliable procedure for selected patients when an experienced multidisciplinary team is involved. Bone infection was the only variable associated with LE amputation.
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