Clinical utility of gray scale renal ultrasound in acute kidney injury

BMC Nephrology

Table 4 Presence of hydronephrosis according to patient characteristics among patients with AKI

Patient characteristics	Hydronephrosis absent (n= 768)	Hydronephrosis present (n= 42)	P value†
Demographics
Age ≥ 65 years	373 (48.6)	30 (71.4)	0.005
Male sex	412 (53.6)	19 (45.2)	0.29
Medical history
BPH	29 (3.8)	3 (7.1)	0.284
Abdominal malignancy	58 (7.6)	10 (23.8)	0.001
Nephrolithiasis	12 (1.6)	3 (7.1)	0.018
Other*	16 (2.1)	7 (16.7)	<0.001
CKD	419 (54.6)	25 (59.5)	0.43
Prior normal RUS	168 (21.9)	15 (35.7)	0.04

Data are presented as n (%).
Abbreviations: Cr creatinine, RUS renal ultrasound, BPH benign prostatic hypertrophy.
*Other includes neurogenic bladder, retroperitoneal fibrosis, congenital renal or urinary tract anomaly, prior pelvic surgery, prior ectopic pregnancy, prior pelvic inflammatory disease, prior surgery on kidney for reason other than cancer, and abdominal trauma.
†Bivariate logistic regression.

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