Ismail Basmaci1, Ertugrul Sefik2. 1. Department of Urology, HSU Izmir Bozyaka Training and Research Hospital, Saim Cikrikci Str. No. 59, Bozyaka, Izmir, Turkey. ibasmaci@yahoo.com. 2. Department of Urology, HSU Izmir Bozyaka Training and Research Hospital, Saim Cikrikci Str. No. 59, Bozyaka, Izmir, Turkey.
Abstract
PURPOSE: To evaluate the predictive value of attenuation value (HU) in renal pelvis urine for detecting renal pelvis urine culture (RPUC) positivity in obstructed urinary systems. METHODS: The study group consisted of patients who had nephrostomy insertion performed because of obstructed system and suspicion of pyonephrosis and percutaneous nephrolithotomy (PCNL) patients who had obstructed calculi. Group 1 consisted of RPUC positive 28 patients during nephrostomy insertion or needle access in PCNL and group 2 consisted of 23 patients with negative RPUC. RPUC results and non-contrast computed tomography measurements [Hounsfield unit (HU)] were compared between group 1 and group 2. A cut-off value was determined for HU. All patients were grouped according to whether they were above or below this value. RESULTS: The median HU calculated from the renal pelvis was - 8.5 (range - 29/- 1) and 10 (range- 4/+ 17) (p < 0.001) in group 1 and group 2, respectively. The cut-off value of HU that predicted positive RPUC was 0. Sensitivity and specificity of HU when considering this cut-off value were 100% and 96%, respectively (p < 0.001). Whereas RPUC positivity was found in 96.6% (28/29) of patients with HU < 0, there were no patients with HU > 0 where RPUC positivity was detected (p < 0.001). CONCLUSION: In this cohort, we found that HU of the urine in the renal pelvis can be used to predict RPUC positivity.
PURPOSE: To evaluate the predictive value of attenuation value (HU) in renal pelvis urine for detecting renal pelvis urine culture (RPUC) positivity in obstructed urinary systems. METHODS: The study group consisted of patients who had nephrostomy insertion performed because of obstructed system and suspicion of pyonephrosis and percutaneous nephrolithotomy (PCNL) patients who had obstructed calculi. Group 1 consisted of RPUC positive 28 patients during nephrostomy insertion or needle access in PCNL and group 2 consisted of 23 patients with negative RPUC. RPUC results and non-contrast computed tomography measurements [Hounsfield unit (HU)] were compared between group 1 and group 2. A cut-off value was determined for HU. All patients were grouped according to whether they were above or below this value. RESULTS: The median HU calculated from the renal pelvis was - 8.5 (range - 29/- 1) and 10 (range- 4/+ 17) (p < 0.001) in group 1 and group 2, respectively. The cut-off value of HU that predicted positive RPUC was 0. Sensitivity and specificity of HU when considering this cut-off value were 100% and 96%, respectively (p < 0.001). Whereas RPUC positivity was found in 96.6% (28/29) of patients with HU < 0, there were no patients with HU > 0 where RPUC positivity was detected (p < 0.001). CONCLUSION: In this cohort, we found that HU of the urine in the renal pelvis can be used to predict RPUC positivity.
Authors: Silvio G Bruni; Francis M Patafio; John A Dufton; Robert L Nolan; Omar Islam Journal: Can Assoc Radiol J Date: 2012-03-06 Impact factor: 2.248
Authors: Emrah Yuruk; Murat Tuken; Suhejb Sulejman; Aykut Colakerol; Ege Can Serefoglu; Kemal Sarica; Ahmet Yaser Muslumanoglu Journal: World J Urol Date: 2016-07-01 Impact factor: 4.226