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Background and Aims Blood pressure variability (BPV) indices have been independently associated with cardiovascular events and mortality in hemodialysis (HD) patients. Data on short-term BPV in patients on peritoneal dialysis (PD) are totally absent. This study examined short-term BPV parameters of patients undergoing PD in comparison to HD and pre-dialysis chronic kidney disease (CKD) patients. Method 38 PD patients were matched for age, gender and dialysis vintage with 76 HD in 1:2 ratio patients and for age and gender with 38 patients with CKD stage 2-4 in 1:1 ration. BPV parameters [standard deviation (SD), weighted SD (wSD), coefficient-of-variation (CV) and average-real-variability (ARV)] were calculated from data from 48hour (PD, HD) and 24hour (CKD) ambulatory BP monitoring according to validated formulas. Results There were no significant differences in BPV indexes studied between PD and HD patients but all BPV indexes in these patients were numerically higher than those in CKD patients. Systolic ARV was significantly higher in PD or HD compared with predialysis CKD during the first and the second interdialytic 24hour periods, both daytime period and nighttime 2 (1st 24hour period: PD:11.86±3.19; HD:11.23±3.45; CKD:9.81±2.49, p=0.016, 2nd 24hour period: PD: 12.18±4.11; HD: 12.96±4.57; CKD: 9.81±2.49, p&amp;lt;0.001). Analysis of diastolic ARV and systolic and diastolic wSD showed similar results. Τhere were no differences with regards to dipping pattern and systolic and diastolic CV during all periods studied. Conclusion BPV indices are similar between PD and HD patients and higher compared to CKD counterparts. Despite what was theoretically expected, PD patients demonstrate high fluctuations in BP in the absence of abrupt shifts in volume.

nephrology, dialysis, transplantation/nephrology dialysis transplantation

P1287A COMPARATIVE STUDY OF BLOOD PRESSURE VARIABILITY INDICES BETWEEN PATIENTS UNDERGOING PERITONEAL DIALYSIS AND THOSE UNDER HEMODIALYSIS OR WITH CHRONIC KIDNEY DISEASE