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Robinson JW, Roberts WW, Matzger AJ. Kidney stone growth through the lens of Raman mapping. Sci Rep 2024; 14:10834. [PMID: 38734821 PMCID: PMC11088632 DOI: 10.1038/s41598-024-61652-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 05/08/2024] [Indexed: 05/13/2024] Open
Abstract
Bulk composition of kidney stones, often analyzed with infrared spectroscopy, plays an essential role in determining the course of treatment for kidney stone disease. Though bulk analysis of kidney stones can hint at the general causes of stone formation, it is necessary to understand kidney stone microstructure to further advance potential treatments that rely on in vivo dissolution of stones rather than surgery. The utility of Raman microscopy is demonstrated for the purpose of studying kidney stone microstructure with chemical maps at ≤ 1 µm scales collected for calcium oxalate, calcium phosphate, uric acid, and struvite stones. Observed microstructures are discussed with respect to kidney stone growth and dissolution with emphasis placed on < 5 µm features that would be difficult to identify using alternative techniques including micro computed tomography. These features include thin concentric rings of calcium oxalate monohydrate within uric acid stones and increased frequency of calcium oxalate crystals within regions of elongated crystal growth in a brushite stone. We relate these observations to potential concerns of clinical significance including dissolution of uric acid by raising urine pH and the higher rates of brushite stone recurrence compared to other non-infectious kidney stones.
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Affiliation(s)
- John W Robinson
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - William W Roberts
- Division of Endourology, Department of Urology, University of Michigan, Ann Arbor, MI, 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Adam J Matzger
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA.
- Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, MI, 48109, USA.
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Jin L, Chen Z, Sun Y, Tian Z, Yi X, Huang Y. Advancements in Uric Acid Stone Detection: Integrating Deep Learning with CT Imaging and Clinical Assessments in the Upper Urinary Tract. Urol Int 2024; 108:234-241. [PMID: 38432217 DOI: 10.1159/000538133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 02/22/2024] [Indexed: 03/05/2024]
Abstract
INTRODUCTION Among upper urinary tract stones, a significant proportion comprises uric acid stones. The aim of this study was to use machine learning techniques to analyze CT scans and blood and urine test data, with the aim of establishing multiple predictive models that can accurately identify uric acid stones. METHODS We divided 276 patients with upper urinary tract stones into two groups: 48 with uric acid stones and 228 with other types, identified using Fourier-transform infrared spectroscopy. To distinguish the stone types, we created three types of deep learning models and extensively compared their classification performance. RESULTS Among the three major types of models, considering accuracy, sensitivity, and recall, CLNC-LR, IMG-support vector machine (SVM), and FUS-SVM perform the best. The accuracy and F1 score for the three models were as follows: CLNC-LR (82.14%, 0.7813), IMG-SVM (89.29%, 0.89), and FUS-SVM (29.29%, 0.8818). The area under the curves for classes CLNC-LR, IMG-SVM, and FUS-SVM were 0.97, 0.96, and 0.99, respectively. CONCLUSION This study shows the feasibility of utilizing deep learning to assess whether urinary tract stones are uric acid stones through CT scans, blood, and urine tests. It can serve as a supplementary tool for traditional stone composition analysis, offering decision support for urologists and enhancing the effectiveness of diagnosis and treatment.
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Affiliation(s)
- Lichen Jin
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China,
| | - Zongxin Chen
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yizhang Sun
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Zhen Tian
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Xincheng Yi
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yuhua Huang
- Department of Urology, The First Affiliated Hospital of Soochow University, Suzhou, China
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Prezioso D, Piccinocchi G, Abate V, Ancona M, Celia A, De Luca C, Ferrari R, Ferraro PM, Mancon S, Mazzon G, Micali S, Puca G, Rendina D, Saita A, Salvetti A, Spasiano A, Tesè E, Trinchieri A. The role of the general practictioner in the management of urinary calculi. Arch Ital Urol Androl 2023; 95:12155. [PMID: 38193217 DOI: 10.4081/aiua.2023.12155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Accepted: 12/19/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND The prevalence of kidney stones tends to increase worldwide due to dietary and climate changes. Disease management involves a high consumption of healthcare system resources which can be reduced with primary prevention measures and prophylaxis of recurrences. In this field, collaboration between general practitioners (GPs) and hospitals is crucial. METHODS a panel composed of general practitioners and academic and hospital clinicians expert in the treatment of urinary stones met with the aim of identifying the activities that require the participation of the GP in the management process of the kidney stone patient. RESULTS Collaboration between GP and hospital was found crucial in the treatment of renal colic and its infectious complications, expulsive treatment of ureteral stones, chemolysis of uric acid stones, long-term follow-up after active treatment of urinary stones, prevention of recurrence and primary prevention in the general population. CONCLUSIONS The role of the GP is crucial in the management and prevention of urinary stones. Community hospitals which are normally led by GPs in liaison with consultants and other health professional can have a role in assisting multidisciplinary working as extended primary care.
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Affiliation(s)
- Domenico Prezioso
- Dipartimento Neuroscienze, Scienze della Riproduzione ed Odontostomatologia Università Federico II, Naples.
| | | | - Veronica Abate
- Department of Clinical Medicine and Surgery, Federico II University, Naples.
| | | | - Antonio Celia
- S.C. Urologia ULSS 7 Pedemontana, Bassano del Grappa (VI).
| | - Ciro De Luca
- Dipartimento Neuroscienze, Scienze della Riproduzione ed Odontostomatologia Università Federico II, Naples.
| | - Riccardo Ferrari
- Department of Urology, University of Modena and Reggio Emilia, Baggiovara (MO).
| | - Pietro Manuel Ferraro
- Sezione di Nefrologia, Dipartimento di Medicina, Università degli Studi di Verona, Verona.
| | - Stefano Mancon
- Department of Urology, IRCCS Humanitas Research Hospital, Rozzano, Milan.
| | - Giorgio Mazzon
- S.C. Urologia ULSS 7 Pedemontana, Bassano del Grappa (VI).
| | - Salvatore Micali
- Department of Urology, University of Modena and Reggio Emilia, Baggiovara (MO).
| | - Giacomo Puca
- Dipartimento Neuroscienze, Scienze della Riproduzione ed Odontostomatologia Università Federico II, Naples.
| | - Domenico Rendina
- Department of Clinical Medicine and Surgery, Federico II University, Naples.
| | - Alberto Saita
- Department of Urology, IRCCS Humanitas Research Hospital, Rozzano, Milan.
| | | | | | - Elisa Tesè
- Società Italiana di Medicina Generale, Florence.
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Song BI, Lee J, Jung W, Kim BS. Pure uric acid stone prediction model using the variant coefficient of stone density measured by thresholding 3D segmentation-based methods: A multicenter study. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 240:107691. [PMID: 37418801 DOI: 10.1016/j.cmpb.2023.107691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 05/25/2023] [Accepted: 06/23/2023] [Indexed: 07/09/2023]
Abstract
Urinary stones are common urological diseases with increasing prevalence and incidence worldwide. Among the various types of stones, uric acid stones can be dissolved by oral chemolysis without any surgical procedure. Therefore, our study demonstrates that variant coefficient of stone density measured by thresholding a three-dimensional segmentation-based method from noncontrast computed tomography images can be used to identify pure uric acid stones from non-pure uric acid stones. This study provides a preoperative pure uric acid stone prediction model that could reduce invasive procedural treatments. The pure uric acid stone prediction model may offer optimized clinical decision-making for patients with urinary stones. BACKGROUND AND OBJECTIVES While most urinary stones are managed with interventional therapy, uric acid (UA) stones can be dissolved by oral chemolysis without invasive procedures. This study aimed to develop and validate a pure UA (pUA) stone prediction model using a variant coefficient of stone density (VCSD) measured by thresholding a three-dimensional (3D) segmentation-based method. METHODS Patients with urolithiasis treated at Keimyung University Dongsan Hospital between January 2017 and December 2020 were divided into training and internal validation sets, and patients from Kyungpook National University Hospital between January 2017 and December 2018 were used as an external validation set. Each stone was segmented by a thresholding 3D segmentation-based method using an attenuation threshold of 130 Hounsfield units. VCSD was calculated as the stone heterogeneity index divided by the mean stone density. RESULTS A total of 1175 urinary stone cases in 1023 patients were enrolled in this study. Of these, 224 (19.1%) were pUA stone cases. Among the potential predictors, thresholding 3D segmentation-based VCSD, age, sex, radio-opacity, hypertension, diabetes, and urine pH were identified as independent pUA stone predictors, and VCSD was the most powerful indicator. The pUA stone prediction model showed good discrimination, yielding area under the receiver operating characteristic curve of 0.960 (95% confidence interval (CI): 0.940-0.979, P < 0.001), 0.931 (95% CI: 0.875-0.987, P < 0.001), and 0.938 (95% CI: 0.912-0.965, P < 0.001) in the training, internal validation, and external validation sets, respectively. CONCLUSIONS VCSD measured using 3D segmentation was a decisive independent predictive factor for pUA stones. Furthermore, the established prediction model with VCSD can serve as a noninvasive preoperative tool to identify pUA stones.
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Affiliation(s)
- Bong-Il Song
- Department of Nuclear Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Korea (the Republic of)
| | - Jinny Lee
- Department of Nuclear Medicine, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, 130 Dongdeok-ro, Jung-gu, Daegu 41944, Korea (the Republic of)
| | - Wonho Jung
- Department of Urology, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea (the Republic of)
| | - Bum Soo Kim
- Department of Urology, School of Medicine, Kyungpook National University, Daegu, Korea (the Republic of).
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Xue W, Cheng J, Zhao J, Wang L, Peng A, Liu X. Comparison potassium sodium hydrogen citrate with sodium bicarbonate in urine alkalization: a prospective crossover-controlled trial. Int Urol Nephrol 2023; 55:61-68. [PMID: 36261757 DOI: 10.1007/s11255-022-03387-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/09/2022] [Indexed: 01/05/2023]
Abstract
PURPOSE Excessive alkalization will increase the incidence of nephrolithiasis. Sodium bicarbonate (NaHCO3) and potassium sodium hydrogen citrate (PSHC) are commonly used drugs for urinary alkalization. We designed a trial to compare PSHC with NaHCO3 in the urine alkalization for the Chinese healthy participants and to explore the effects of PSHC and NaHCO3 on circadian rhythms of urine pH value. METHOD This study was a prospective, crossover, randomized, controlled trial, in which a total of 34 healthy volunteers participated in two study phases and took PSHC and NaHCO3 at the maintenance dose, respectively. RESULT The average level of urine pH of PSHC participants in 24 h was significantly higher than that of NaHCO3 (P < 0.001). The urine pH value of participants taking PSHC and NaHCO3 or under physiological conditions showed significant variation in 24 h (P < 0.05) and fitted to a mathematical model (Fourier series). Under physiological conditions, the average urine pH value in the daytime was higher than that in the night, and reached the peak at about 10:00, 16:00, and 22:00. The peak of urine pH at 24 h after taking PSHC and NaHCO3 was both higher than the baseline. The peak time of urine pH and the curve trend were similar, but the peak value in PSHC group was significantly higher than that in NaHCO3 group. CONCLUSIONS There was a circadian rhythm of urine pH value under physiological conditions. PSHC was more effective in urinary alkalization than NaHCO3 at the current maintenance oral dose and administration time without changing the rhythm of urine pH value. CLINICAL TRIAL REGISTRATION NCT04352153.
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Affiliation(s)
- Wen Xue
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China
| | - Jiafen Cheng
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China
| | - Jing Zhao
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China
| | - Ling Wang
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China
| | - Ai Peng
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China
| | - Xinying Liu
- Department of Nephrology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Road, Shanghai, 200072, People's Republic of China.
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Julià F, Costa-Bauza A, Berga F, Grases F. Effect of theobromine on dissolution of uric acid kidney stones. World J Urol 2022; 40:2105-2111. [PMID: 35689678 PMCID: PMC9279199 DOI: 10.1007/s00345-022-04059-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/16/2022] [Indexed: 12/03/2022] Open
Abstract
Purpose Uric acid renal lithiasis has a high prevalence and a high rate of recurrence. Removal of uric acid stones can be achieved by several surgical techniques (extracorporeal shock wave lithotripsy, endoscopy, laparoscopy, open surgery). These stones can also be eliminated by dissolution within the kidneys, because the solubility of uric acid is much greater when the pH is above 6. At present, N-acetylcysteine with a urinary basifying agent is the only treatment proposed to increase the dissolution of uric acid stones. In this paper, we compare the effect of theobromine and N-acetylcysteine on the in vitro dissolution of uric acid calculi in artificial urine at pH 6.5. Methods The dissolution of uric acid renal calculi was performed in a temperature-controlled (37 °C) chamber. A peristaltic pump was used to pass 750 mL of synthetic urine (pH 6.5) through a capsule every 24 h. Stone dissolution was evaluated by measuring the change in weight before and after each experiment. Results N-acetylcysteine increased the dissolution of uric acid calculi, but the effect was not statistically significant. Theobromine significantly increased the dissolution of uric acid calculi. Both substances together had the same effect as theobromine alone. The addition of theobromine to a basifying therapy that uses citrate and/or bicarbonate is a potential new strategy for the oral chemolysis of uric acid stones. Conclusion Theobromine may prevent the formation of new stones and increase the dissolution of existing stones.
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Affiliation(s)
- Francesca Julià
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research (IUNICS-IdISBa), University of Balearic Islands, 07122, Palma de Mallorca, Spain
| | - Antonia Costa-Bauza
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research (IUNICS-IdISBa), University of Balearic Islands, 07122, Palma de Mallorca, Spain.
| | - Francisco Berga
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research (IUNICS-IdISBa), University of Balearic Islands, 07122, Palma de Mallorca, Spain
| | - Felix Grases
- Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research (IUNICS-IdISBa), University of Balearic Islands, 07122, Palma de Mallorca, Spain
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Spradling K, Ganesan C, Conti S. Medical Treatment and Prevention of Urinary Stone Disease. Urol Clin North Am 2022; 49:335-344. [PMID: 35428438 DOI: 10.1016/j.ucl.2021.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The pathophysiology underlying urinary stone formation remains an area of active investigation. There are many pharmacotherapies aimed at optimizing metabolic factors and reducing urinary supersaturation of stone components that play an important role in urinary stone prevention. In addition, medical expulsive therapy for ureteral stones and medical dissolution therapy for uric acid-based urinary stones are helpful treatment tools and are used alongside surgical treatments in the management of urinary stones.
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Affiliation(s)
- Kyle Spradling
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA.
| | - Calyani Ganesan
- Division of Nephrology, Stanford University School of Medicine, Stanford, CA, USA
| | - Simon Conti
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
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Moore J, Nevo A, Salih S, Abdul-Muhsin H, Keddis M, Stern K, Humphreys M. Outcomes and rates of dissolution therapy for uric acid stones. J Nephrol 2022; 35:665-669. [PMID: 34170507 DOI: 10.1007/s40620-021-01094-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 06/09/2021] [Indexed: 12/14/2022]
Abstract
INTRODUCTION To describe the outcomes and quantify the rate of uric acid stone medical dissolution therapy using automated, software-generated stone volume measurements. METHODS A sample of patients treated with oral dissolution therapy was reviewed from a single institution between 2008 and 2019. Baseline patient demographics, metabolic urine testing and stone characteristics were collected. Computed tomography (CT) scan images were evaluated using the quantitative Stone Analysis Software (qSAS) to obtain total stone volume (TSV), maximum diameter (MD) and stone number. Rate of dissolution using total stone volume was calculated over the treatment period. RESULTS Twenty-seven patients were started on oral dissolution therapy, corrected for renal function. After mean duration of 180 days (range 41-531), 16 patients failed treatment resulting in surgical therapy. Twenty stones in 11 patients showed complete or partial dissolution. Compared to those who failed treatment, patients with complete or partial dissolution had lower 24 h urinary uric acid and higher treatment urine pH. Thirteen (65%) stones showed complete dissolution after a mean 167.6 days. Rate of change for responders was 4.73 mm3 or 0.6% of total stone volume per day. Time to dissolution of one half of stone volume based on total stone volume was 86 days (12.30 weeks). DISCUSSION/CONCLUSIONS Software-calculated total stone volume may be an effective method of measuring uric acid stone response to oral alkalization therapy. Stone volume decreased by 50% after 12.3 weeks of treatment and could be an important benchmark for oral dissolution therapyoral dissolution therapy. Further studies with a larger sample and validation of the software are needed to confirm if this can be used to guide surveillance schedules for dissolution therapy.
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Affiliation(s)
- Jonathan Moore
- Department of Urology, Mayo Clinic Arizona, 5779 E Mayo Blvd, Phoenix, AZ, 85250, USA
| | - Amihay Nevo
- Department of Urology, University Hospitals, Cleveland, OH, USA
| | - Saif Salih
- Department of Urology, Mayo Clinic Arizona, 5779 E Mayo Blvd, Phoenix, AZ, 85250, USA
| | - Haidar Abdul-Muhsin
- Department of Urology, Mayo Clinic Arizona, 5779 E Mayo Blvd, Phoenix, AZ, 85250, USA
| | - Mira Keddis
- Department of Nephrology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Karen Stern
- Department of Urology, Mayo Clinic Arizona, 5779 E Mayo Blvd, Phoenix, AZ, 85250, USA
| | - Mitchell Humphreys
- Department of Urology, Mayo Clinic Arizona, 5779 E Mayo Blvd, Phoenix, AZ, 85250, USA.
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Tsaturyan A, Bosshard P, Bokova E, Bonny O, Stritt K, Roth B. The impact of stenting prior to oral chemolysis of upper urinary tract uric acid stones. Int Urol Nephrol 2021; 54:37-45. [PMID: 34850328 DOI: 10.1007/s11255-021-03072-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 11/17/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE To evaluate the impact of ureteral stenting on the success rate of oral chemolysis in the management of suspected uric acid upper urinary tract (UUT) stones. METHODS Retrospective matched-pair analysis of 172 patients treated with oral chemolysis from 01/2010 to 12/2019. Patients with low density (upon non-contrast enhanced computer tomography [NCCT]), radiolucent (on plain radiography) urinary stones, a low urine pH (< 6) and/or history of uric acid urolithiasis were included. Potassium citrate and/or sodium bicarbonate were used for alkalization (target urine pH: 6.5-7.2). Patient 1:1 matching was performed for the presence of indwelling ureteral stent, stone diameter, stone density, and stone localization. Stone-free status was evaluated after 12 weeks using NCCT. Multivariable logistic regression analysis was used to assess factors affecting the outcome. RESULTS Mean patient age was 61 years (73% males). Mean stone size was 12 mm. Overall success rates after 12-weeks of chemolysis for stones at any localization in the UUT and ureteral stones were 60.5 and 77.3%, respectively. Smaller stone size (OR = 0.94; CI 0.888-0.992; p = 0.026) and lower pre-treatment urine pH (OR = 0.131; CI 0.023-0.737; p = 0.021) significantly increased the success of oral chemolysis. Ureteral stenting did not have any impact on the efficacy of oral chemolysis. CONCLUSION Oral chemolysis is an effective treatment modality for patients with UUT stones suspected of uric acid content irrespective of ureteral stenting. Smaller stone diameter and lower urine pH at diagnosis increase its efficacy.
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Affiliation(s)
- Arman Tsaturyan
- Department of Urology, Inselspital, University of Bern, Bern, Switzerland
| | - Piet Bosshard
- Department of Urology, Inselspital, University of Bern, Bern, Switzerland
- Department of Urology, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, 1011, Lausanne, Switzerland
| | - Elizaveta Bokova
- Department of General Medicine, First Moscow State Medical University After I.M. Sechenov, Moscow, Russia
| | - Olivier Bonny
- Department of Nephrology, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, Lausanne, Switzerland
| | - Kevin Stritt
- Department of Urology, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, 1011, Lausanne, Switzerland
| | - Beat Roth
- Department of Urology, Inselspital, University of Bern, Bern, Switzerland.
- Department of Urology, Centre Hospitalier Universitaire Vaudois (CHUV), University of Lausanne, 1011, Lausanne, Switzerland.
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Role of Citrus Fruit Juices in Prevention of Kidney Stone Disease (KSD): A Narrative Review. Nutrients 2021; 13:nu13114117. [PMID: 34836376 PMCID: PMC8625077 DOI: 10.3390/nu13114117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/12/2021] [Accepted: 11/13/2021] [Indexed: 01/04/2023] Open
Abstract
To explore the relationship between citrus fruit juices (oranges, grapefruits, and lemonades) and kidney stone disease (KSD). METHODS A systematic review was performed using the Medline, EMBASE, and Scopus databases, in concordance with the PRISMA checklist for all English, French, and Spanish language studies regarding the consumption of citrus fruit juices and the relationship to urinary stone disease. The main outcome of interest was the association of citrus fruit juices with KSD. RESULTS Thirteen articles met the criteria for inclusion in the final review. Three large epidemiological studies found that grapefruit juice was a risk factor for stone formation, while orange juice did not increase the risk for KSD. Ten small prospective clinical studies found that orange, grapefruit, and lemon juices all increased urinary citrate levels. Only orange and grapefruit juices had an alkalinizing effect and while lemon juice has a protective effect by raising urinary citrate levels, it lacked a significant alkalinizing effect on urine pH. Orange juice and grapefruit juices significantly increased urinary oxalate levels, while orange juice also had a high carbohydrate content. CONCLUSION While orange juice seems to play a protective role against stone formation, grapefruit was found to raise the risk of KSD in epidemiological studies but had a protective role in smaller clinical studies. Lemon juice had a smaller protective role than orange juice. Larger amounts of, as well as more accurate, data is needed before recommendations can be made and a high carbohydrate content in these juices needs to be taken into consideration.
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Abstract
PURPOSE OF REVIEW Surgical management is the cornerstone of urolithiasis treatment, but high recurrence rates and associated complications necessitate the existence of medical treatment options, aiming at dissolution of kidney stones and prevention of recurrence. The purpose of this review is to present the most recent knowledge existing in scientific literature, regarding dissolution therapy and ways of monitoring nephrolithiasis patients. RECENT FINDINGS A number of laboratory studies have been performed testing experimental treatments (tolvaptan, chlorthalidone, atorvastatin, a-lipoic acid, glucosaminoglycans, plant extracts), to reduce kidney stone formation and cellular damage and showed encouraging results. Uric acid stones is the main target of dissolution therapy, but until last years, existing level of evidence was low. A number of prospective and randomized studies, proved the efficacy and safety of oral chemolysis for radiolucent stones and associated prognostic features of success. Tolvaptan and a-Lipoic acid were also tested in patients with cystinuria and resulted in reduction of recurrence. Finally, some new diagnostic markers are suggested as tests for the monitoring of urolithiasis patients, with satisfying accuracy and discriminative ability. SUMMARY Medical dissolution therapy for nephrolithiasis is an effective option, especially for patients with radiolucent/uric acid stones. In the future, we need clinical trials to confirm the encouraging results of pilot studies testing several agents for patients with cystinuria.
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Study of risk factor of urinary calculi according to the association between stone composition with urine component. Sci Rep 2021; 11:8723. [PMID: 33888737 PMCID: PMC8062512 DOI: 10.1038/s41598-021-87733-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 03/30/2021] [Indexed: 01/22/2023] Open
Abstract
Urolithiasis is a common urinary disease with high recurrence. The risk factor for the recurrence of calculi is not very clear. The object of the present study was to evaluate the association between calculi composition and urine component and analyse the risk factor for the recurrence of urolithiasis. In this study, a total of 223 patients with calculi and healthy control were enrolled, and the components of the calculi and urina sanguinis collected before surgery were analysed. Of the 223 patients, 157 were males and 66 were females. According to the stone composition, the case group was subdivided into three groups. 129 patients had single calcium oxalate stones, 72 had calcium oxalate stones mixed with other stones and 22 had other type of stones excluding calcium oxalate stones. Urine biochemicals were analysed and the associations were found between the chemicals in each group. Multivariate logistic analysis demonstrated that reduced urinary magnesium and uric oxalic acid were independent risk factors when comparing all cases with normal controls. Only decreased urinary magnesium was found to be a risk factor comparing the single calcium oxalate group with normal control group. Low level of urinary magnesium and uric oxalic acid were found to be risk factors comparing the mixed calcium oxalate group with normal control group. No risk factor was found comparing the other stone group with normal control group. In conclusion, there were clear relationships between stone components and urine chemicals. Urine chemicals might be risk factors to predicate the occurrence of urolithiasis.
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Wiessmeyer JR, Ozimek T, Struck JP, Hupe MC, Willig J, Merseburger AS, Kramer MW. Comprehensive Nomogram for Prediction of the Uric Acid Composition of Ureteral Stones as a Part of Tailored Stone Therapy. Eur Urol Focus 2021; 8:291-296. [PMID: 33589393 DOI: 10.1016/j.euf.2021.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 01/11/2021] [Accepted: 02/01/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND Oral chemolitholysis is a noninvasive therapy for uric acid (UA) stones. Proper patient selection is crucial for success of the therapy. OBJECTIVE To develop a nomogram for prediction of UA stones using parameters gathered during emergency work-up for flank pain. DESIGN, SETTING, AND PARTICIPANTS A single-center cohort (459 patients) with singular ureteral stones and available stone analysis was retrospectively reviewed for radiological, urinary, and serological findings indicating UA stones. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS A Mann-Whitney U test or Kruskal-Wallis test was applied for univariate analysis. Categorical variables were compared using a χ2 test. Binary logistic regression of significant parameters was performed to design the nomogram. RESULTS AND LIMITATIONS Univariate analysis revealed statistically significant differences in parameters between predominantly UA and non-UA groups, including median age (60 yr, interquartile range [IQR] 51.5-70.5 vs 51 yr, IQR 39-62; p < 0.001), body mass index (30.0 kg/m2, IQR 27.25-35.0 vs 26.6 kg/m2, IQR 24.0-30.467; p < 0.001), stone density (435.0 HU, IQR 329.0-528.0 vs 750.0 HU, IQR 548.0-995.0; p < 0.001), serum UA (437.5 μmol/l, IQR 374.25-478.0 vs 321.0 μmol/l, IQR 273.0-377.0; p < 0.001), and urine pH (5.5, IQR 5.0-5.5 vs 6.0, IQR 5.5-6.5; p < 0.001). Radiolucency was more frequent in the predominantly UA group (88.60% vs 32.70%; p < 0.001). Multivariate binary logistic regression confirmed age, body mass index, stone density, serum UA, urine pH, and radiolucency as independent predictors of UA stones and these parameters were used to design the nomogram. CONCLUSIONS We present a nomogram for the prediction of uric acid stones. PATIENT SUMMARY We developed a nomogram as a simple tool with potential to be useful in patient counseling regarding chemolitholysis as a tailored stone treatment for uric acid urinary stones.
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Affiliation(s)
- Judith R Wiessmeyer
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Tomasz Ozimek
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Julian P Struck
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Marie C Hupe
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Johannes Willig
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Axel S Merseburger
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany
| | - Mario W Kramer
- Department of Urology, University Hospital Schleswig-Holstein, Campus Lübeck, Lübeck, Germany.
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Kim HJ. Non-surgical treatment of urinary stone. JOURNAL OF THE KOREAN MEDICAL ASSOCIATION 2020. [DOI: 10.5124/jkma.2020.63.11.668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Some patients with urinary stones can be managed non-surgically through observation, medication, or extracorporeal shockwave lithotripsy (ESWL). Symptomatic urinary stones can initially be treated conservatively using analgesics and hydration. When uncontrolled pain or infection is present, immediate diversion via either percutaneous nephrostomy or ureteral stenting may be necessary. Medical expulsive therapy utilizing alpha-blocker may benefit a selected group of patients with stones larger than 5 mm. Oral or percutaneous chemolysis is a well-established non-invasive option with a reasonable success rate for patients with a certain component such as uric acid. When medical treatment is applied, its unintended side effects should be considered and routinely monitored. Extracorporeal shockwave lithotripsy is a highly effective and safe modality in treating urinary stones when adequately indicated. In addition to the size and location of the stone, information obtained from non-enhanced computed tomography such as stone density, stone heterogenicity index, and stone-to-skin distance can be applied to predict the possibility of ESWL failure. Modifications in shock wave delivery by altering shock rate and voltage can improve shock wave efficacy. Urinary stones can be managed effectively and safely using non-surgical approaches.
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Farag M, Jack GS, Wong L, Bolton DM, Lenaghan D. What is the best way to manage ureteric calculi in the time of COVID‐19? A comparison of extracorporeal shockwave lithotripsy (SWL) and ureteroscopy (URS) in an Australian health‐care setting. BJUI COMPASS 2020; 2:92-96. [PMID: 35474891 PMCID: PMC8988776 DOI: 10.1002/bco2.55] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/25/2020] [Accepted: 10/10/2020] [Indexed: 12/26/2022] Open
Abstract
Objectives To determine the best way to intervene for ureteric stones which still require treatment during the COVID‐19 pandemic, with respect to infection control. In this setting, in which resources are constrained, extracorporeal shockwave lithotripsy (SWL) has prima facie advantages over ureteroscopy (URS). It is also necessary to also consider posttreatment resource consumption in regards to complications and repeat procedures. Subjects and methods The ideal ureteric stone treatment during a pandemic such as COVID‐19 would involve minimum resource consumption and a minimum number of patient attendances. We compared all patients initially treated with SWL to those initially treated with URS for acute ureteral colic within the state of Victoria, Australia in 2017. Results A total of 2724 ureteric stones were analyzed, a cumulative “3‐month exposure and burden on the healthcare system” was calculated for each patient by their initial procedure type. The readmission rate for URS was significantly higher than for SWL, 0.92 readmissions/patient for URS versus 0.54 readmissions/patient for SWL (P < .001). The cumulative hospital stay per patient for these two procedures was 2.35 days for SWL versus 3.21 days for URS (P < .001). The number of procedures per patient was 1.52 for SWL versus 1.89 for URS (P = .0213). Conclusions Patients with ureteric stones treated initially by SWL have shorter length of stay with fewer overall attendances and procedures at 3 months than those treated with URS. During a pandemic such as COVID‐19, SWL may have benefits in preserving hospital resources and limiting opportunity for virus transmission, compared to URS.
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Affiliation(s)
- Matthew Farag
- Department of Urology University of MelbourneAustin Health Heidelberg VIC Australia
- Department of Urology St Vincent’s Melbourne Melbourne VIC Australia
| | - Gregory S. Jack
- Department of Urology University of MelbourneAustin Health Heidelberg VIC Australia
| | - Lih‐Ming Wong
- Department of Urology St Vincent’s Melbourne Melbourne VIC Australia
| | - Damien M. Bolton
- Department of Urology University of MelbourneAustin Health Heidelberg VIC Australia
| | - Daniel Lenaghan
- Department of Urology St Vincent’s Melbourne Melbourne VIC Australia
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Nephrolithiasis: Harnsäuresteine sprechen gut auf Alkalisierungstherapie an. Aktuelle Urol 2020; 51:410-412. [PMID: 32846449 DOI: 10.1055/a-1071-2126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Oral chemolysis is an effective, non-invasive therapy for urinary stones suspected of uric acid content. Urolithiasis 2020; 48:501-507. [PMID: 32770255 PMCID: PMC7666279 DOI: 10.1007/s00240-020-01204-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/27/2020] [Indexed: 02/07/2023]
Abstract
Despite the possible benefit from avoiding stone surgery with all its possible complications, oral chemolysis is rarely performed in patients with urinary stones suspected of uric acid content. Among the reasons for its limited use is the sparse and low-quality data on its efficacy and the lack of reliable factors predicting its outcome. We thus performed a retrospective single-center cohort study of 216 patients (median patient age 63 years) with 272 renal (48%) and/or ureteral (52%) stones treated with oral chemolysis from 01/2010 to 12/2019. Patients with low urine pH (< 6), low stone density upon non-contrast enhanced computed tomography (NCCT), radiolucent urinary stones on plain radiography, and/or a history of uric acid urolithiasis were included. Potassium citrate and/or sodium/magnesium bicarbonate were used for alkalization (target urine pH 6.5–7.2). Median stone size was 9 mm, median stone density 430 Hounsfield Units. Patients with ureteral stones < 6 mm were excluded since stones this small are very likely to pass spontaneously. The stone-free status of each patient was evaluated after 3 months using NCCT. Oral chemolysis was effective with a complete and partial response rate of stones at 3 months of 61% and 14%, respectively; 25% of stones could not be dissolved. Lower stone density (OR = 0.997 [CI 0.994–0.999]; p = 0.008) and smaller stone size (OR = 0.959 [CI 0.924–0.995]; p = 0.025) significantly increased the success rate of oral chemolysis in multivariate logistic regression analysis. More precise stone diagnostics to exclude non-uric-acid stones could further improve outcome.
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Abstract
PURPOSE OF REVIEW An overly acidic urine resulting in supersaturation of urine with respect to uric acid is the major mechanism responsible for uric acid nephrolithiasis. The present review summarizes findings from recent human physiologic studies examining the pathophysiology and reversibility of low urine pH in uric acid stone formers. RECENT FINDINGS Epidemiologic and metabolic studies have confirmed an increase in the prevalence of uric acid nephrolithiasis and reported its association with several features of the metabolic syndrome including dyslipidemia, hyperglycemia, hepatic steatosis, and greater visceral adiposity. Physiologic studies in uric acid stone formers have identified diet-independent excessive net acid excretion and concomitant reduction in urinary buffering from impaired renal ammoniagenesis as the two causes underlying the greater aciduria. Administration of the insulin sensitizer pioglitazone to uric acid stone formers reduced the acid load presented to the kidney and enhanced ammoniagenesis and ammonium excretion, resulting in significantly higher urine pH. SUMMARY Recent human physiologic studies have identified greater acid excretion and reduced urinary buffering by ammonia as two culprits of aciduria in uric acid nephrolithiasis that can be reversed by pioglitazone, raising new questions regarding the origin of the aciduria and opening the door to pathophysiology-based treatment of uric acid stones.
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Alenezi NA, Zanaty F, Hodhod A, El-Gharabawy M, El-Sherif E, Badawy A, El-Shazly M. The safety of ureteral stenting with the use of potassium citrate for management of renal uric acid stones. Urol Ann 2020; 12:37-41. [PMID: 32015615 PMCID: PMC6978978 DOI: 10.4103/ua.ua_60_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 08/30/2019] [Indexed: 11/27/2022] Open
Abstract
Objectives: The objective is to evaluate the relative risks of ureteric stents application while managing uric acid stones with potassium citrate in terms of stone encrustations and urinary tract infection (UTI). Patients and Methods: We prospectively enrolled patients with renal uric acid stones who received K citrate from 2013 to 2018. Patient's demographics were collected. All patients were evaluated using noncontrast computed tomography (CT) scan to measure the stone size and density. JJ ureteric stent was inserted prior to the initiation of treatment. At follow-up, all patients underwent urine analysis for pH and to detect UTI. CT was repeated at 1 month and those patients who showed incomplete stone resolution underwent another course of treatment for another month. CT was repeated prior to stent removal. The presence of encrustations was inspected and collected. Results: We collected 59 patients with a median age of 36 years (18–73) and median stone burden of 26 mm3 (15–50). The median stone density was 310 HU (175–498). Twenty-one patients (35.6%) received K citrate treatment for 1-month, while the remaining patients had 2 months treatment. Sixteen patients (27.1%) had a complete stone dissolution, 41 patients (69.5%) had more than 50% decrease of stone burden while only 2 patients (3.4%) had stones with poor dissolution. Four patients (6.8%) experienced UTI while 2 patients (3.4%) had visible JJ encrustations. Most of these complications occurred when the treatment was offered for the 2nd month. Conclusion: Short-term use of ureteral stents is safe during the management of uric acid stones with K citrate.
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Affiliation(s)
| | - Fouad Zanaty
- Department of Urology, Menoufia University, Al Minufiyah, Egypt
| | - Amr Hodhod
- Department of Urology, Menoufia University, Al Minufiyah, Egypt
| | | | - Eid El-Sherif
- Department of Urology, Menoufia University, Al Minufiyah, Egypt
| | - Atef Badawy
- Department of Urology, Menoufia University, Al Minufiyah, Egypt
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Tonyali S. The efficacy of medical dissolution therapy for uric acid nephrolithiasis. World J Urol 2019; 38:2999. [PMID: 31811371 DOI: 10.1007/s00345-019-03047-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 12/01/2019] [Indexed: 11/27/2022] Open
Affiliation(s)
- Senol Tonyali
- Istanbul Universitesi Istanbul Tip Fakultesi, Uroloji Anabilim Dali, Cerrahi Monoblok Kat:1 Capa-Fatih, Istanbul, Turkey.
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