Formula for predicting the impaction of ureteral stones

AbstractThe purpose of the study was to investigate variables that may predict ureteral stone impaction and create a new model to predict more accurately stone impaction based on preoperative NCCT findings. Data of 238 patients who underwent URS were analyzed. Stone size, stone location, Hounsfield unit (HU) value of the stone, ureteral wall thickness (UWT) and grade of hydronephrosis were recorded. HU values of the ureter which are measured proximal and distal to the stone were recorded. Subsequently, we determined the factors that could predict the stone impaction in univariate and multivariate logistic regression analysis. After the AUC analysis for these factors, we created a new model to predict more accurately stone impaction. The formula was named Impacted Stone Formula (ISF). Stone impaction verified endoscopically. Predictors of impacted stones were evaluated using univariate and multivariate logistic regression analyses. Diagnostic value for the prediction of stone impaction was analyzed with receiver operating characteristic (ROC) incline. Overall, there were 196 patients included in the study. Multivariate regression analysis revealed that the HU below/above ratio, UWT, and grade of hydronephrosis were the crucial predictors of stone impaction (OR 20.53,p 
Source: Urolithiasis - Category: Urology & Nephrology Source Type: research

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Authors: Kaya C, Kaynak Y, Karabag A, Aykaç A Abstract BACKGROUND: Our aim was to detect the role of radiological abdominal fat parameters by tomography and stone density by plain X-ray on extracorporeal Shock Wave Lithotripsy (SWL) stone-free rate. METHODS: The patients who had undergone SWL for a single opaque renal stone
Source: Current Medical Imaging Reviews - Category: Radiology Tags: Curr Med Imaging Rev Source Type: research
AbstractThe aim of this study was to determine whether the presence or degree of hydronephrosis (HN) affects the stone disintegration efficacy of shock wave lithotripsy (SWL). A comprehensive literature search using PubMed, Embase, Cochrane Library, and Web of Science was conducted to retrieve relevant studies. Risk ratios (RRs) and mean differences (MDs) with corresponding 95% confidence intervals (CIs) were calculated for comparisons of outcomes of interest. In total, seven comparative studies with 2033 patients were included. Overall results indicated no significant difference in stone-free rate (SFR) and retreatment ra...
Source: Urolithiasis - Category: Urology & Nephrology Source Type: research
We present the case of a 46-year-old man who underwent successful antegrade ureteroscopy for lithiasis in his allograft ureter. At a scheduled follow-up 15  years after transplantation, computed tomography (CT) detected a 12-mm renal stone in the renal pelvis of the transplanted kidney. During his follow-up, gross hematuria was seen; the stone moved to the ureter, causing hydronephrosis. Ultrasound and non-contrast CT revealed hydronephrosis and a 15- mm stone in the transplanted ureter. Considering the stone size, location, and the difficulty of the access to the anastomosed ureteral orifice, percutaneous ureteroscop...
Source: Urolithiasis - Category: Urology & Nephrology Source Type: research
Abdülkadir Kandemir, Mehmet Giray SönmezUrology Annals 2019 11(3):310-313 Ureteral catheters are frequently used in urology clinics for intrinsic or extrinsic pathologies which cause ureteral obstruction to provide urinary drainage from the kidney to the bladder. With the increase in stent use, an increase is observed in complications occurring due to ureteral stents in direct proportion with this increase, and ureteral double-J (DJ) stents forgotten in the urinary system are observed commonly in urological cases when the patients do not refer to a health institution in this condition and may cause severe proble...
Source: Urology Annals - Category: Urology & Nephrology Authors: Source Type: research
Conclusions: Laparoscopic pyeloplasty and concomitant flexible renoscopy through lowermost trocar with basket extraction is a simple, attractive alternative for the simultaneous treatment of ureteropelvic junction obstruction presenting with coexisting nephrolithiasis. This method is useful and feasible, with minimal invasiveness and an early post-operative recovery.
Source: International Braz J Urol - Category: Urology & Nephrology Source Type: research
We present imaging of an 84-year-old woman incidentally found to have right ureteral herniation through the diaphragm with an obstructing 8 mm stone in the right proximal ureter with moderate hydronephrosis.
Source: Urology - Category: Urology & Nephrology Authors: Source Type: research
AbstractPatients presenting acutely with obstructing stones often have a ureteral stent placed as a temporizing solution. Ureteroscopy is then commonly performed in a staged fashion, but occasionally the stone is found to have passed. We aimed to identify the frequency and predictors of ureteral stone passage with a stent in place. Records were reviewed to identify patients who had a stent placed for a single ureteral stone. Subsequent ureteroscopy or CT scan was used to ascertain stone passage. Effect of age, gender, BMI, stone diameter, alpha blocker use, urinary tract infection, hydronephrosis, and stent duration on sto...
Source: Urolithiasis - Category: Urology & Nephrology Source Type: research
Abstract Urolithiasis is a rare complication after kidney transplant. Over the years, treatment of kidney stones has evolved radically, but a standard approach for transplanted kidneys has not yet been defined. Here, we present a 69-year-old male patient who received successful treatment of nephrolithiasis of the transplanted kidney. The patient, who had received a kidney from a deceased donor, was admitted to our department following a posttransplant Doppler ultrasonography showing severe hydronephrosis of the transplanted kidney associated with acute renal function decay. Computed tomography scan confirmed the h...
Source: Experimental and Clinical Transplantation : official journal of the Middle East Society for Organ Transplantation - Category: Transplant Surgery Authors: Tags: Exp Clin Transplant Source Type: research
This study proposes to compare both approaches regarding the probability of spontaneous stone passage (SSP) and its effect on patient ’s quality of life (QoL). A prospective trial was carried out from July to October of 2017. 50 patients were selected with hydronephrosis secondary to ureteral stones requiring urgent urinary diversion and divided into two groups according to diversion technique: percutaneous nephrostomy (PCN) or retrograde ureteral stent (RUS). The rate of SSP and QoL were evaluated. A PCN group (18 patients) and a RUS group (32 patients) were set. Stone size was higher in PCN (median 92 mm2) tha...
Source: Urolithiasis - Category: Urology & Nephrology Source Type: research
A 10-month-old, intact male chinchilla (Chinchilla lanigera) was diagnosed with urolithiasis, unilateral hydroureter, and hydronephrosis secondary to ureteral obstruction confirmed by radiography and ultrasonography. Nephrectomy and cystotomy were performed, and the urolith was suspected to be a semen-matrix calculus (mineralized copulatory plug) based on the discovery of sperm within the renal pelvis of the nephrectomized kidney on histopathology; this was later confirmed through a post-mortem examination.
Source: Journal of Exotic Pet Medicine - Category: Veterinary Research Authors: Tags: Case Report Source Type: research
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