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Original Article Percutaneous Nephrolithotomy Under Ultrasound Guidance in Treating Allograft Stones

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Original Article Percutaneous Nephrolithotomy Under Ultrasound Guidance in Treating Allograft Stones Int J Clin Exp Med 2018;11(8):8352-8357 www.ijcem.com /ISSN:1940-5901/IJCEM0069781 Original Article Percutaneous nephrolithotomy under ultrasound guidance in treating allograft stones Chao Wei*, Yucong Zhang*, Gaurab Pokhrel, Jiahua Gan, Xiaming Liu, Zhangqun Ye, Xiaoyi Yuan, Xiaolin Guo Department of Urology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiafang Avenue, Qiaokou, Wuhan 430030, Hubei, China. *Equal contributors. Received November 24, 2017; Accepted May 4, 2018; Epub August 15, 2018; Published August 30, 2018 Abstract: Objective: Allograft stones are rare but can cause rapid and severe obstruction of the graft, significantly decreasing graft and patient survival rates. Because allograft kidneys are solitary and patients are in an immuno- suppressed state, minimally invasive techniques, rather than open surgery, should be the treatment modality for al- lograft stones. Percutaneous nephrolithotomy (PCNL) is an optimal option for treatment of these patients. Material and methods: Records of patients with allograft stones, undergoing PCNL, under ultrasound guidance in our hospi- tal from January 2007 to September 2017, were retrospectively reviewed. Results: This study identified 11 patients with allograft stones, treated with PCNL under ultrasound guidance. Presentation symptoms included hematuria in 18.2% of cases, pain in 27.3%, fever in 9.1%, and 45.5% were symptom-free. Average stone size was 1.43 cm (range 0.7 to 2.6 cm). KUB radiography or NCCT, 3-4 days after the procedure, demonstrated that 9 patients (81.8%) were stone-free. One patient needed medical expulsion therapy for residual stones and another underwent unsuccessful PCNL. Postoperative complications developed in 3 patients, including bleeding and fever. Conclusion: PCNL is an acceptable, safe, and reliable method for treatment of allograft stones. Puncture and dilation during percutaneous access of uniquely located grafts, however, remains a major challenge for successful PCNL. Keywords: Percutaneous nephrolithotomy, ultrasound guidance, allograft stones, retrospective study Introduction scopic lithotripsy (URSL), and percutaneous nephrolithotomy (PCNL) [3]. This study exam- Renal transplantation is the best treatment ined the efficacy and safety of PCNL, under option for patients with end-stage renal dis- ultrasonographic guidance, used to manage ease, despite a shortage of kidneys and possi- cases with allograft stones. ble transplant-related complications. Optimi- zation of immunosuppressive protocols and Materials and methods short-term complication treatments significant- ly increase graft and patient survival rates, This study retrospectively reviewed records of resulting in rare and relatively long-term graft cases with allograft stones undergoing PCNL complications. Allograft stones are a rare from January 2007 to September 2017. complication in transplanted kidneys, with an incidence of 0.4-1% of renal transplantation PCNL procedure patients [1]. Although it is quite rare, if obstruc- tion occurs, it can lead to rapid and severe Patients were placed in the supine position. deterioration to graft function [2]. Due to the A convex abdominal probe was placed parallel medical complexity of these cases and extra- to the long axis of the kidney and all possible anatomic location of the allograft renal, man- calices from superior to inferior poles were agement of allograft stones has become very scanned. Preoperatively, non-contrast-enhanc- difficult. Allograft stones are considered a ed computed tomography (NCCT) scans were transplant-related complication that requires used to evaluate the calyxceal anatomy. A minimally invasive surgeries including extracor- suitable calyx for percutaneous access was poreal shock wave lithotripsy (ESWL), uretero- identified during the intraoperative ultrasonog- Percutaneous nephrolithotomy in allograft stones Table 1. Patient demographics and presentation symptoms Overall 11 Gender (%) Male 8 (72.7) Female 3 (27.2) Mean age (range) 40.7 (19-57) Mean years between transplantation and diagnosis of allograft stones (range) 5.0 (0.5-14) Mean μmol/L preop serum creatinine (range) 395 (160-803) Mean ml/min/1.73 m2 preop estimated glomerular filtration rate (range) 23.3 (6.3-42.9) Mean μmol/L preop serum uric acid (range) 387.8 (278.4-594.2) Presentation symptoms (%) Hematuria 2 (18.2) Pain 3 (27.2) Fever 1 (9.1) Symptom-free 5 (45.5) Table 2. Stone characteristics for allograft stones and stone fragments were No. (%) washed out along with irrigation fluid. At the end of the procedure, a 7Fr double J tube was Overall 11 placed over a zebra guide-wire and a 10Fr Size (cm) nephrostomy tube was inserted for drainage 1 or Less 3 (27.3) through the tract and fixed to the skin. A rou- Greater than 1 and less than 2 6 (54.5) tine KUB radiograph or NCCT was taken 3-4 2 or Greater 2 (18.2) days after surgery to assess residual stones. Mean (range) 1.43 (0.7-2.6) Nephrostomy tubes were removed within 5-7 Location days and Double-J tubes were removed 4-5 Pelvis 2 (18.2) weeks after discharge by cystoscopy. Caliceal 1 (9.1) Results Ureteropelvic junction 4 (36.4) Ureter 1 (9.1) This study identified 11 patients with allograft Mutiple 3 (27.3) stones, treated with PCNL under ultrasound guidance. Patient demographics and presenta- tion symptoms are shown in Table 1. Most raphy scan. The targeted calyx was punctured patients came to the hospital because of renal with the tip of a needle and tracks were contin- failure or hydronephrosis at follow up, without uously monitored and confirmed by ultrasonog- any symptoms (45%). Hyperuricemia was found raphy. The obturator was removed and clear in 4 patients (36%). urine escaping from the needle confirmed the presence of the needle in the pelvicalyceal Stone characteristics are shown in Table 2. system. A super rigid guidewire was passed Average stone size was 1.43 cm. Most stones through the needle into the collecting system were greater than 1 cm (73%), some even and confirmed by ultrasonography. Skin and greater than 2 cm (18%). The most common fascia over the puncture site were incised and a stone location was the ureteropelvic junction 18Fr fascial dilator was pushed over the guide- (36%), however, there were still many multiple wire to establish the access tract. During the stones (27%). procedure, rotating the dilator with angular shearing force facilitated easy passage from Operative and postoperative characteristics the renal capsule into the collecting system. are shown in Table 3. “Stone-free” was consid- Clear urine flowing from the dilator confirmed ered when patients were completely cleared the presence of the dilator in the collecting sys- of stone fragments or stone fragments were tem. Holmium laser lithotripsy was performed less than 4 mm. One patient with a residual 8353 Int J Clin Exp Med 2018;11(8):8352-8357 Percutaneous nephrolithotomy in allograft stones Table 3. Operative and postoperative characteristics patients can be diagnosed through labo- Overall 11 ratory tests and imaging examinations Number of tracts (%) [5]. In view of this, routine follow up ex- aminations of the urinary system by ul- 1 9 (81.8) trasonography are necessary and help- More than 1 2 (18.2) ful for early detection of urinary calculi Modalities (%) in patients undergoing renal transplan- Flexible nephroscopy 4 (36.4) tation. Rigid nephroscopy 7 (63.6) Stone-free (%) 9 (81.8) Allograft stones may be already placed Postop complication (%) 3 (27.3) in situ, called donor-gifted allograft li- Bleeding 2 (18.2) thiasis, or they may be the result of new Fever 1 (9.1) stone formation after transplantation [6]. Predisposing factors for allograft stone Median days of postop hospital stay (range) 7 (6-24)* formation include urinary stasis, reflux, *A patient underwent two unsuccessful PCNL. recurrent urinary tract infections, renal tubular acidosis, pH changes, super- stone of about 5 mm needed medical expulsion saturated urine, decreased inhibitor activity, therapy. tertiary hyperparathyroidism, hypercalcemia, and hypercalciuria [7, 8]. Immunosuppressive Figure 1 shows a case of unsuccessful PCNL in therapy with calcineurin inhibitors may cause the treatment of allograft stones. The patient direct tubular damage and decrease renal fi- was a 49-year-old male. His first-stage PCNL ltration, resulting in hyperuricosuria in 50% to was terminated because of severe intraopera- 60% of patients [9, 10]. Because uric acid tive bleeding. Unfortunately, after 6 days, sec- stones are radiolucent, ultrasonography should ond-stage PCNL was also terminated because be used as the primary diagnostic imaging tool of severe intraoperative bleeding and pelvis for renal transplant patients. perforation. In addition, the nephrostomy tube was found, by NCCT scan, to be inserted deep The extra-anatomic location of allografts is into the parenchyma protruding 22.37 mm unique, making the management of allograft from the opposite surface of the transplanted stones complicated. In addition, allograft kid- kidney (see Figure 1C). He also suffered severe neys are solitary and patients are in an immu- postoperative bleeding and a high selective nosuppressed state. Therefore, minimally inva- angioembolization was arranged. Hemodialysis sive methods, rather than open surgery, sh- was arranged until renal function recovered. ould be the treatment of choice for allograft The patient was finally discharged. Two months stones. These patients have poor ability to later, the allograft stones were cleared by resist infections and immunosuppressive ag- another PCNL through the existing percutane- ents will affect wound healing. Management of ous access. allograft stones includes observation, ESWL, URSL, PCNL, and open surgery. Successful Discussion treatment of allograft stones with ESWL has been reported [3, 7, 11, 12]. However, because Allograft stones are a very rare complication of the usual position of allograft kidneys in and treatment remains a major clinical chal- the pelvis, shockwaves may be hindered and lenge. Because allograft kidneys are isolated, attenuated by the bony pelvis [13] and over- it is very important for early effective diagno- lying bowel [3, 14].
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