Results: The average thiamine level was 50.1 ng/mL (normal range, 24–66 ng/mL). Of the 100 patients included in the analysis, 15 were found to have reduced serum thiamine levels (<24 ng/mL). The patients were dichotomized according to the median serum thiamine level into a high-thiamine group (≥35.5 ng/mL) and a low-thiamine group (<35.4 ng/mL), and the clinical characteristics were compared between the two groups. The former group exhibited higher serum levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and exhibited Seliciclib lower C-reactive protein (CRP) than the latter group. We found a significant correlation

between the serum thiamin levels and the serum levels of AST and ALT (p < 0.0001, r = 0.44, p = 0.0002, r = 0.63). In addition, 18 patients showed a decrease from the baseline of the serum thiamine level post

hemodialysis. We divided these 18 patients into two groups, namely, the decrease group (n = 18) and the increase group (n = 82), and compared the clinical characteristics between the two groups. The comparison, however, revealed no significant difference in the Kt/V or type of dialyzer between the two groups. Conclusion: We conclude that thiamine deficiency did not occur in our regular dialysis patients, with the exception find more of a few cases. The serum AST or ALT may be used as a marker of thiamine deficiency in dialysis patients. TONGPAE Mephenoxalone PINCHART1, NONGNUCH ARKOM2 1M.D., Fellow Nephrology Division, Medicine Department,

Ramathibodi Hospital; 2M.D. Nephrology Division, Medicine Department, Ramathibodi Hospital Introduction: There are many techniques used in vascular access surveillance for hemodialysis with the goal to detect access stenosis before thrombosis occurs. The ideal technique is that easy to perform, cost-effective, widely available and highly accurate. The purpose of this study is to determine sensitivity and specificity of three diagnostic tests including Venous Static Pressure (VP), Ultrasound Dilution Test (UDT), Duplex Doppler Ultrasound (DDU) or combination tests. Method: Patients with chronic stable hemodialysis via permanent vascular access were recruited and measured static venous pressure, intra-access flow using UDT and DDU. All patients were confirmed by angiography which is the gold standard for diagnosis access stenosis. Each test was performed within two weeks apart. Results: All three tests were evaluated using Receiver Operating Characteristic curve and found that UDT had the AUC of 0.76 (95% CI 0.6 to 0.9), DDU 0.66 (95% CI 0.5 to 0.8) and VP 0.54 (95% CI 0.3 to 0.7). The cutoff value used to predict access stenosis was 750 ml/min for UDT, PSV 290 cm/sec for DDU, and ratio 0.2 for VP. When compared the results of combined VP and DDU to UDT using the same cutoff value as above, the sensitivity and specificity were similar.