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Background and Aims Increased intra-abdominal pressure (IAP) is commonly found among post-surgical patients and can induce organ dysfunction. However, its prevalence and impact after kidney transplantation have not been adequately described. We aimed to study the prevalence of increased IAP after kidney transplantation and its consequences on transplant outcomes. Method IAP was prospectively measured in 121 kidney transplant recipients every 8h during the first 72h after surgery using the urinary bladder technique (UnoMeter Abdo-Pressure kit). Mean IAP values during the first 24h (24h-IAP) were used in this analysis. Grading of intra-abdominal hypertension was defined according to WSACS guidelines. Patients were followed for at least 12 months or until graft failure or death. The study was approved by the local ethics committee and informed consent was obtained in all cases. Results 24h-IAP was 12.6±3.5 mmHg. 84.2% of subjects presented with intra-abdominal hypertension during the first 72h after kidney transplantation. Body mass index (OR: 1.35, 95% CI 1.12-1.63; P=0.002), male sex (OR: 3.34, 95% CI 1.1-10.3; P=0.032) and hemodialysis as renal replacement therapy before transplantation (OR: 4.35, 95% CI 1.32-14.4; P=0.016) were independent determinants of intra-abdominal hypertension. IAP was an independent risk factor for delayed graft function (*model adjusted for recipient age, sex, history of previous kidney transplants, recipient comorbidities, donor terminal serum creatinine and comorbidities, number of HLA mismatches &amp;gt;4, cold ischemia time and donation after cardiac death status), graft failure and death (**model adjusted for all variables included in the previous model plus delayed graft failure) (Figure). Conclusion Increased IAP was highly common after transplant surgery and was associated with higher rates of delayed graft function, graft failure and death. Routine IAP monitoring should be considered after transplantation to facilitate early identification of complications and initiation of the appropriate treatment to stop its effects.

P1717OUTCOMES OF INCREASED INTRA-ABDOMINAL PRESSURE AFTER KIDNEY TRANSPLANTATION