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Su H, Liu H, Yang K, Chen W, Yuan D, Wang W, Zhu G, Hu B, Jiang K, Zhu J. Construction of a novel rabbit model of ureteral calculi implanted with flowable resin. BMC Urol 2022; 22:105. [PMID: 35850713 PMCID: PMC9295447 DOI: 10.1186/s12894-022-01056-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 07/06/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of this study was to characterize the pathophysiological changes of hydronephrosis caused by ureteral calculi obstruction in a new rabbit ureteral calculi model by implanting flowable resin. METHODS Forty New Zealand rabbits were randomly divided into two groups: the calculi group and the sham control group. In the calculi group (n = 20), rabbits were operated at left lower abdomen and the left ureter was exposed. Then flowable resin (flowable restorative dental materials) was injected into the left ureter using a 0.45 mm diameter intravenous infusion needle. Then light-cured for 40 s by means of a dental curing light to form calculi. In the sham control group, normal saline was injected into the ureter. Rabbits underwent X-ray and routine blood and urine tests preoperatively, as well as X-ray, CT, dissection, HE staining and routine blood and urine tests on 1, 3, 5 and 7 days postoperatively. Stone formation was assessed by X-ray and unenhanced CT scan after surgery. The pathophysiological changes were evaluated through dissection, HE staining and routine blood and urine tests. RESULTS Ureteral calculi models were successfully constructed in 17 rabbits. In calculi group, high-density shadows were observed in the left lower abdomen on postoperative day 1st, 3rd, 5th and 7th by X-ray and CT scan. Dissection found obstruction formation of the left ureters, dilatation of the renal pelvis and upper ureter during 7 days after surgery. The renal long-diameters of the left ureters increased only on the 1st postoperative day. HE staining found ureteral and kidney damage after surgery. In calculi group and sham group,the serum creatinine, urea nitrogen, white blood cells and urine red blood cells were raised at day 1 after surgery. However, the indicators returned to normal at day 3, 5, and 7. CONCLUSIONS This is a stable, less complicated operation and cost-effective ureteral calculi model by implanting flowable resin. And this novel model may allow us to further understand the pathophysiology changes caused by ureteral calculi obstruction.
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Affiliation(s)
- Hao Su
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China.,Zunyi Medical University, Zunyi, 563000, Guizhou Province, China
| | - Heng Liu
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China.,Zunyi Medical University, Zunyi, 563000, Guizhou Province, China
| | - Ke Yang
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China.,Guizhou Medical University, Guiyang, 550002, Guizhou Province, China
| | - Weiming Chen
- Guizhou Medical University, Guiyang, 550002, Guizhou Province, China
| | - Dongbo Yuan
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China.,Guizhou University School of Medicine, Guiyang, 550025, Guizhou Province, China
| | - Wei Wang
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China
| | - Guohua Zhu
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China
| | - Bin Hu
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China
| | - Kehua Jiang
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China.
| | - Jianguo Zhu
- Department of Urology, Guizhou Provincial People's Hospital, Guiyang, 550002, Guizhou Province, China. .,Zunyi Medical University, Zunyi, 563000, Guizhou Province, China. .,Guizhou Medical University, Guiyang, 550002, Guizhou Province, China. .,Guizhou University School of Medicine, Guiyang, 550025, Guizhou Province, China.
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Adams LG, Williams JC, McAteer JA, Hatt EK, Lingeman JE, Osborne CA. In vitro evaluation of canine and feline calcium oxalate urolith fragility via shock wave lithotripsy. Am J Vet Res 2006; 66:1651-4. [PMID: 16261842 DOI: 10.2460/ajvr.2005.66.1651] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To test the hypothesis that feline calcium oxalate uroliths are intrinsically more resistant to comminution via shock wave lithotripsy (SWL) than canine calcium oxalate uroliths through comparison of the fragility of canine and feline uroliths in a quantitative in vitro test system. SAMPLE POPULATION Calcium oxalate uroliths (previously obtained from dogs and cats) were matched by size and mineral composition to create 7 pairs of uroliths (1 canine and 1 feline urolith/pair). PROCEDURE Uroliths were treated in vitro with 100 shock waves (20 kV; 1 Hz) by use of an electrohydraulic lithotripter. Urolith fragmentation was quantitatively assessed via determination of the percentage increase in projected area (calculated from the digital image area of each urolith before and after SWL). RESULTS After SWL, canine uroliths (n = 7) fragmented to produce a mean +/- SD increase in image area of 238 +/- 104%, whereas feline uroliths (7) underwent significantly less fragmentation (mean image area increase of 78 +/- 97%). The post-SWL increase in fragment image area in 4 of 7 feline uroliths was < 50%, whereas it was > 150% in 6 of 7 canine uroliths. CONCLUSIONS AND CLINICAL RELEVANCE Results indicate that feline calcium oxalate uroliths are less susceptible to fragmentation via SWL than canine calcium oxalate uroliths. In some cats, SWL may not be efficacious for fragmentation of calcium oxalate nephroliths or ureteroliths because the high numbers of shock waves required to adequately fragment the uroliths may cause renal injury.
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Affiliation(s)
- Larry G Adams
- Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907-1277, USA
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