ESPU Congress 2018 - Abstract Book

64 29 th CONGRESS OF THE ESPU MATERIAL AND METHODS Patients and methods: A total of 817 fetuses(1078 kidneys) who followed for antenatal hydronephro- sis 2001–2016 were reviewed retrospectively. Ultrasound was used for diagnosis and follow-up. Fetuses were divided into two groups; such as <28 weeks and ≥28 weeks of gestation. AP diameter ≥4 mm in 16–27 weeks and ≥7 mm in ≥28 weeks of pregnancy was accepted as hydronephrosis according to UTD Classification System. Degree of hydronephrosis was determined according to AP diameter, Onen grading system and UTD classification. Mean follow-up was 8.2(1–16) years. RESULTS 531 fetuses(727 kidneys) were diagnosed before 28 weeks of gestation. Of the 531fetuses(727 kid- neys) <28weeks of gestation(group 1), AP diameter was 4–6 mm(UTD-1,Onen-1) in 366 kidneys, 7–10 mm(UTD-2,Onen-2) in 144, 11–15 mm(UTD-2–3,Onen-2–3) in 96, 16–20 mm(UTD- 3,Onen-3) in 68, and >20 mm(UTD-3,Onen-4) in 53. At the postnatal period, 2.7 % of 4–6 mm patients, 10.4 % of 7–10 mm, 20.8 % of 11–15 mm, 41.2 % of 16–20 mm, 84.9 % of >20 mm required surgery. In group 1, a total of 118 kidneys(16.2 %) required surgery. Of the 286fe- tuses(351 kidneys)≥28 weeks of gestation(group 2), AP diameter was 7–10 mm(UTD-1,Onen-1) in 162kidneys, 11–15 mm(UTD-2,Onen-2) in 90, 16–20 mm(UTD-2–3,Onen-2–3) in 46, 21–25 mm(UTD-3,Onen-3) in 32, and >25 mm(UTD-3,Onen-4) in 21kidneys. At the postnatal pe- riod, 0.6 % of 7–10 mm patients, 5.6 % of 11–15 mm, 17.4 % of 16–20 mm, 28.1 % of 21–25 mm, 66.7 % of >25 mm required surgery. In group 2, a total of 37 kidneys (10.5 %) required surgery. CONCLUSIONS Onen grading system is more appropriate in defining the severity of hydronephrosis in utero com- pared to UTD classification and AP diameter because Onen grading determine whether there is cortical parenchymal loss or not. Fetuses with Onen-1 hydronephrosis or unilateral Onen-2 need to be seen in every 2 months, unilateral Onen-3 or bilateral Onen-2 cases in every month, bilateral Onen-3 or unilateral Onen-4 cases in every 2 weeks, and Onen-4 bilateral cases in every week. 09:45–09:54 Discussion 09:54–09:57 S6-4 (PP) INCIDENCE OF POSTOBSTRUCTIVE DIURESIS AFTER RESOLUTION OF URETEROPELVIC JUNCTION OBSTRUCTION WITH A NORMAL CONTRALATERAL KIDNEY Joshua ROTH  1 , Jeffrey LEISER  2 , Jessica CASEY  3 , Konrad SZYMANSKI  1 , Benjamin WHITTAM  1 , Rosalia MISSERI  1 , Martin KAEFER  1 , Richard RINK  1 and Mark CAIN  1 1) Riley Hospital for Children, Urology, Indianapolis, USA - 2) Riley Hospital for Children, Nephrology, Indianapolis, USA - 3) Children's Urology Associates, Las Vegas, USA PURPOSE Postobstructive diuresis (POD) after pyeloplasty or percutaneous nephrostomy tube (PCN) inser- tion for ureteropelvic junction obstruction (UPJO) in patients with a normal contralateral kidney is not well described. We sought to determine its incidence and characteristics.