caa a22 4500 605493375 CHVBK 20210128100520.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00261-015-0417-9 doi (NATIONALLICENCE)springer-10.1007/s00261-015-0417-9 CT-based assessment of renal function impairment in patients with acute unilateral ureteral obstruction by urinary stones [Elektronische Daten] [Dong Kim, Seong Yoon, Dong-Ho Ha, Myong Kang, Jin Lee, Sunseob Choi] Purpose: The purpose of our study was to evaluate computed tomography (CT) imaging factors related to renal function impairment in patients with acute unilateral ureteral obstruction by urinary stones. Materials and Methods: The study included 94 patients who had acute unilateral ureteral obstruction due to a urinary stone and a normal contralateral kidney. We retrospectively investigated the serum creatinine (SCr) levels immediately prior to CT examination and at least 1week after treatment. CT examinations were performed using a CT urography protocol, including pre- and post-contrast images. The 67 patients with a SCr change of less than 0.3mg/dL constituted group A. The other 27 patients with a SCr decrease of more than 0.3mg/dL constituted group B. To evaluate factors related to renal function impairment, differences in CT imaging factors between the two groups, including the cortical and medullary density, renal and pelvic anteroposterior diameter, and perinephric fluid, were statistically analyzed. Results: The SCr immediately prior to CT examination significantly differed between the two groups. The follow-up SCr after resolution did not significantly differ between the two groups. The difference in the mean cortical and medullary HU on the nephrographic phase between the obstructed kidney and normal kidney was higher in group B than in group A (27.1±23.1 and 69.4±59.1 vs. 5.7±8.8 and 31.8±34.8; p<0.001 and p=0.004, respectively). The cut-off point for the difference in the mean cortical HU on the nephrographic phase between the obstructed kidney and normal kidney for renal function impairment was 15 HU, as determined by a receiver operating characteristic curve analysis. Conclusions: Patients with significantly impaired renal function due to an acute unilateral ureteral obstruction may show a decreased nephrogram of the affected kidney and a significant difference in the HU on the nephrographic phase between the obstructed and normal kidney. Springer Science+Business Media New York, 2015 Kidney nationallicence Multidetector computed tomography nationallicence Hydronephrosis nationallicence Renal insufficiency nationallicence Ureteral calculi nationallicence Kim Dong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Yoon Seong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Ha Dong-Ho Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Kang Myong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Lee Jin Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Choi Sunseob Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut Abdominal Imaging Springer US; http://www.springer-ny.com 40/7(2015-10-01), 2446-2452 0942-8925 40:7<2446 2015 40 261 https://doi.org/10.1007/s00261-015-0417-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00261-015-0417-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Dong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 700 1- Yoon Seong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 700 1- Ha Dong-Ho Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 700 1- Kang Myong Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 700 1- Lee Jin Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 700 1- Choi Sunseob Department of Radiology, Dong-A University College of Medicine, Dongdaesin-dong 3(sam)ga, Seo-gu, 602-715, Busan, South Korea aut NATIONALLICENCE 773 0- Abdominal Imaging Springer US; http://www.springer-ny.com 40/7(2015-10-01), 2446-2452 0942-8925 40:7<2446 2015 40 261