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Patients Returning to Dialysis after Failed Kidney Transplant: How Do They Fare? A Gulf Perspective

Open Journal of Internal Medicine 2014年第3期4卷 82-86页

作者： Samra Abouchacra Ahmed Chaaban Abdelkarim Saleh Muna Rukhaimi osman furaih Naveed Haq Mohamed osman Nicole Gebran Qutaiba Hussain Fares Chedid Mohammad Budruddin Suad Sajwani Department of Nephrology Dubai Hospital Dubai UAE Department of Nephrology King Faisal Specialist Hospital and Research Center Riyadh KSA Department of Nephrology Sheikh Khalifa Medical City Abu Dhabi UAE Department of Nephrology Tawam Hospital Al Ain UAE

An increasing number of failed transplant patients returning to dialysis (FTRD) have been observed with reported worse survival compared to transplant-naive dialysis (TxN) patients. This study aimed to assess outcomes of FTRD vs. matched TxN controls in a Gulf region multi-center trial of 800 HD patients. Similar mortality was seen, likely due to earlier start and better HD adequacy in FTRD. Younger age, less diabetes and living donor transplantation in majority with 27% graft nephrectomy (Nx) might also confer benefits. Subgroup analysis of Nx patients showed more hospitalizations and prior rejection episodes with lower graft survival. The deaths, however, oc-curred only in nonNx group and are likely explained by older age, longer duration on HD, more prevalence of diabetes and CAD. FTRD showed similar survival to TxN. Early intensive HD might account for the benefit. Whether Nx confers advantage is unclear because of the small sample size.

关键词： Renal Transplant Graft Nephrectomy Hemodialysis Dialysis Transplant-Naive Patients End Stage Renal Disease ESRD

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On the Performance of Mobile WiMAX System: Measurement and Propagation Studies

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International Journal of Communications, Network and System Sciences 2010年第11期3卷 863-869页

作者： furaih Alshaalan Saleh Alshebeili Abdulkareem Adinoyi 不详

In this paper, we present drive test results for mobile WiMAX system for desert and cosmopolitan terrains where there are few studies reported in the literature. The extensive measurement is performed in the framework of the physical performance of the WiMAX technology which is often considered as a 4G system. Path loss model is fitted for the collected data. The work is unique in the sense that most empirical channel models are produced in regions where the environments (weather, buildings, vegetation, among others) are quite different from the desert terrains that are considered in this study. We also show that shadowing is truly lognormal in dB and the standard deviation values are calculated for the desert terrain from the measurement data. The measurements are collected using WiMAX BS station, with greenpacket dongle, and NEMO versatile outdoor drive test equipment to evaluate and characterize the performance of the system. The received signal strength indicators measured, are analyzed to complement network design and network optimization for regions where the popular models may not be accurate.

关键词： OFDMA WiMAX RSSI Path Loss Models

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