A novel use of attenuation value (Hounsfield unit) in non-contrast CT: diagnosis of pyonephrosis in obstructed systems
International Urology and Nephrology, cilt.52, sa.1, ss.9-14, 2020 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 52 Sayı: 1
- Basım Tarihi: 2020
- Doi Numarası: 10.1007/s11255-019-02283-2
- Dergi Adı: International Urology and Nephrology
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, BIOSIS, EMBASE, Gender Studies Database, MEDLINE
- Sayfa Sayıları: ss.9-14
- Anahtar Kelimeler: Pyonephrosis, Urinary tract obstruction, Urine culture, Computed tomography, Attenuation value (Hounsfield unit)
- Sağlık Bilimleri Üniversitesi Adresli: Evet
Özet
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.