PD22-08 ACOUSTIC RADIATION FORCE IMPULSE IMAGE FOR EVALUATION OF PARENCHYMA ELASTICITY IN ACUTE HYDRONEPHROTIC KIDNEY: A PRELIMINARY REPORT

Abstract

You have accessJournal of UrologyCME1 Apr 2023PD22-08 ACOUSTIC RADIATION FORCE IMPULSE IMAGE FOR EVALUATION OF PARENCHYMA ELASTICITY IN ACUTE HYDRONEPHROTIC KIDNEY: A PRELIMINARY REPORT Jen-Chieh Chen, Shih-Yen Lu, Tzu-Ping Lin, and William J. Huang Jen-Chieh ChenJen-Chieh Chen More articles by this author , Shih-Yen LuShih-Yen Lu More articles by this author , Tzu-Ping LinTzu-Ping Lin More articles by this author , and William J. HuangWilliam J. Huang More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000003295.08AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: The acoustic radiation force impulse (ARFI) imaging is a new technique with great promise in the field of elastography. It had been used widely in evaluation of various disease involving tissue stiffness, such as liver fibrosis, thyroid nodules, subcutaneous lymph nodes, and breast lesions. However, in kidney, the blood flow is thought to affect the elasticity more than tissue stiffness. To date, the utility of ARFI imaging in acute hydronephrotic kidney remains unexplored. In this study, we aim to compare the shear wave velocity (SWV) measured by ARFI ultrasound elastography of hydronephrotic kidneys caused by ureteral stones and the normal contralateral kidneys. METHODS: A total of 31 patients presented to our emergency room (ER) due to unilateral renal colic caused by ureteral stone with hydronephrosis from April 2020 to September 2022 were prospectively recruited. The patient’s character was recorded. The kidney ultrasound with ARFI imaging of the affected kidney and the contralateral side was performed by a single experienced technician immediately after the diagnosis was made. The SWV value, expressed as speed (m/sec.) of wave propagation through the tissue, was calculated for each kidney in its outer renal cortex. To each of the kidney, the SWV value was assigned through the average of ten different measurements. The Wilconxon signed rank test was used to compare the SWV value of affected and contralateral kidney in an individual. All P values less than 0.05 were considered statistically significant. RESULTS: Among 31 patients, 16 patients presented to our ER at acute/intermediate phase (<24 hours of symptoms onset) and 15 patients at late phase (≥ 24 hours). The SWV value showed variable changes between the affected and contralateral kidneys in patients who came to our ER within 24 hours of symptoms onset. However, in patients who presented to our ER at late phase, the SWV value was significantly lower in their affected kidney (p=0.043). Subsequent analysis found that the SWV value did not showed any significant correlations with age, side of the affected kidney, pain score, stone size, degree of hydronephrosis, presence of urinary tract infection, or presence of acute kidney injury. All patients received stone management successfully afterward. After a mean follow-up of 3 months, there was no evidence of significant sequelae. CONCLUSIONS: The SWV value showed variable changes in patients whose interval between the onset of the symptoms and the kidney stiffness measurement was less than 24 hours. However, SWV value decreased significantly in patients whose interval was greater than 24 hours. This finding may compatible with the concept that the renal blood flow decreases after 24 hours of obstructive uropathy. To our knowledge, this is the first study to evaluate the ARFI image in acute hydronephrotic kidney. Source of Funding: Nil © 2023 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 209Issue Supplement 4April 2023Page: e667 Advertisement Copyright & Permissions© 2023 by American Urological Association Education and Research, Inc.MetricsAuthor Information Jen-Chieh Chen More articles by this author Shih-Yen Lu More articles by this author Tzu-Ping Lin More articles by this author William J. Huang More articles by this author Expand All Advertisement PDF downloadLoading ...