Risk factors for bleeding complications in percutaneous renal biopsy

Background Among the complications in percutaneous renal biopsy, bleeding is the most frequent and sometimes becomes fatal.Methods We prospectively studied 394 consecutive percutaneous renal biopsies in 359 patients (male/female = 188/171). The mean age of the patients was 44.0 ± 17.2 years. Percutaneous renal biopsies were performed on native kidneys under direct visualization by ultrasound, using an automated spring-loaded biopsy device and a 16-cm 18G needle.Results The most common complication was hematoma (n = 149, 37.8%). De novo macrohematuria was observed in 29 patients (7.4%). Other complications included pain (n = 27, 6.9%), loss of blood (n = 17, 4.3%), and renal dysfunction (increase of serum creatinine more than 0.2mg/dl, n = 9, 2.2%). Although there were no severe complications such as loss of blood requiring a blood transfusion, loss of kidney function, or death, 10 patients had an extended rest period in bed because of moderate complications. Hypertension and amyloidosis had significant influence on the complications.Conclusions For those who are clinically suspected of having amyloidosis or hypertension, more careful biopsy procedures and observations are necessary.     

经皮肾穿刺活检术前血液透析对急性肾损伤患者术后出血并发症的影响

目的探讨经皮肾穿刺活检术(PRB)前血液透析能否降低急性肾损伤(AKI)患者术后的出血风险。方法本研究为队列观察性研究。纳入2015年1月至2018年12月于南方医科大学南方医院肾内科诊断为AKI并接受PRB的患者为研究对象。按PRB术前患者是否接受血液透析治疗分为术前透析组和术前未透析组;按照术后是否出现肾周血肿分为肾周血肿组和无肾周血肿组。比较两组患者PRB术前AKI分期、血红蛋白水平、凝血功能和肾脏病理改变等基线临床资料,以及术后出现肾周出血并发症情况,包括24 h内肾周血肿大小、肉眼血尿、腰腹痛、血红蛋白下降值及干预治疗(如介入手术、输血等)等。采用Logistic回归模型法分析PRB术后发生肾周血肿的危险因素。结果共90例AKI患者被纳入本研究,其中术前透析组41例,术前未透析组49例。术前透析组AKI 2~3期占比显著高于未透析组(100.0%比75.5%,P<0.001)。两组术前凝血功能指标及血小板计数的差异无统计学意义。术后24 h内肾脏超声复查结果显示,两组术后肾周血肿发生率(56.1%比63.3%,P=0.489)、术后肾周大血肿(≥5 cm)发生率(26.1%比22.6%,P=0.766)、术后血红蛋白降幅(3.7%比1.2%,P=0.505)的差异无统计学意义;两组均无输血、动静脉瘘形成、肾血管介入或手术、院内死亡等情况发生。有肾周血肿组和无肾周血肿组肾脏病理表现均以急性肾小管坏死(ATN)为主,两组在年龄、性别、体重指数、合并糖尿病和高血压、AKI分期、术前透析与否、血肌酐、血尿素氮、血红蛋白、血小板计数和肾脏病理类型等项目上的差异均无统计学意义。Logistic回归分析结果显示,PRB术后肾周血肿发生风险与术前血液透析治疗无独立相关性(β=0.568,P=0.241);多因素Logistic回归分析结果显示,PRB术后大血肿与术前透析亦无独立相关性(β=0.967,P=0.958)。结论术前血液透析对AKI患者PRB术后肾周血肿发生率及血红蛋白降幅无明显影响。术前血液透析降低PRB术后出血风险的作用还有待进一步研究验证。     

Renal biopsy in patients with acute renal failure and prolonged bleeding time: a preliminary report

A significant percentage of acute renal failure patients may benefit from a diagnostic renal biopsy, but this procedure carries an unacceptable risk of hemorrhagic complications. We have previously shown that red cell transfusions and 1-deamino-8-D-arginine vasopressin (DDAVP) are effective in managing uremic bleeding. We now report the results of giving washed red cell transfusions or DDAVP to 9 patients with uremia due to acute renal failure to improve hemostasis and allow a diagnostic renal biopsy. All patients admitted to the study had prolonged bleeding time (BT), ie, more than 10 minutes, and our procedure shortened BT in all cases, though in two patients BT after the therapeutic procedure was still longer than normal. In these two, biopsy was not performed. The seven patients whose BT became normal underwent percutaneous biopsy. Only minor clinical complications were registered. Computerized tomography (CT) revealed an incidence of perirenal hematomas comparable to that usually reported in patients with normal or slightly depressed renal function who undergo renal biopsy. Our findings indicate that red cell transfusions or DDAVP can temporarily restore hemostasis, allowing a diagnostic percutaneous biopsy in patients with acute renal failure.     

Renal function at the time of renal biopsy as a predictor of prognosis in patients with primary AL-type amyloidosis

Background Amyloid light-chain (AL)-type amyloidosis is a plasma cell disorder with a poor prognosis for survival. Although prognostic factors, such as the number of organs involved and heart function or failure in respond to therapy have been clarified based on studies including a large series of patients, there are large interindividual differences in the prognosis of patients with primary AL-type renal amyloidosis.Methods To clarify the prognostic factors of AL-type renal amyloidosis, we retrospectively investigated the clinical manifestations, histopathological data, and prognosis of 21 patients with amyloidosis, who had been diagnosed by renal biopsy.Results Eleven patients died, at a mean observational time of 21.7 months after renal biopsy, whereas the mean observational time was 51.0 months for the 10 patients who survived. The creatinine clearance rate was significantly higher, and the serum creatinine concentration and the grade of interstitial damage were significantly lower in surviving patients (P < 0.05). The presence of amyloid fibrils in organs other than the kidney did not influence prognosis for survival. However, the intraventricular septum was thinner in surviving patients (P < 0.1). Thirteen patients had undergone melphalan-prednisolone therapy, but it did not affect prognosis for survival. Cox proportional hazard regression analysis revealed that the renal function at the time of diagnosis was a significant and independent prognostic factor for survival.Conclusions Our study demonstrated that renal function at the time of biopsy and renal interstitial damage are the best predictors of survival in AL-type renal amyloidosis.     

Renal mass biopsy for the small renal mass

Opponents of premanagement biopsy of small renal masses are not difficult to find. Many urologists contend that the benefits of biopsy do not outweigh the risks, arguing that the results do not influence management substantially and that the most useful information from renal mass biopsy can be attained with advanced imaging. In this article, we develop the counter arguments and demonstrate that renal mass biopsy should be implemented into the small renal mass management algorithm.     

Outcomes of small renal mass needle core biopsy, nondiagnostic percutaneous biopsy, and the role of repeat biopsy

Background

Percutaneous needle core biopsy has become established in the management of small renal masses ≤4 cm (SRMs). Recent series have reported success rates of ≥80%. Nondiagnostic results continue to be problematic.

Objective

To determine the results of SRM biopsy and the outcomes of nondiagnostic biopsy and repeat biopsy.

Design, setting, and participants

Patients undergoing renal tumor biopsy (RTB) for suspected renal cell carcinoma (RCC) were included in a prospectively maintained database.

Measurements

The database was analyzed retrospectively to determine the pathology and outcomes of SRM biopsy. Outcomes of patients with nondiagnostic biopsy were determined. Patients undergoing repeat biopsy were identified and their outcomes analyzed.

Results and limitations

Three hundred forty-five biopsies were performed (mean diameter: 2.5 cm). Biopsy was diagnostic in 278 cases (80.6%) and nondiagnostic in 67 cases (19.4%). Among diagnostic biopsies, 221 (79.4%) were malignant, 94.1% of which were RCC. Histologic subtyping and grading of RCC was possible in 88.0% and 63.5% of cases, respectively. Repeat biopsy was performed in 12 of the 67 nondiagnostic cases, and a diagnosis was possible in 10 (83.3%). Eight lesions were malignant and two were oncocytic neoplasms. Pathology was available for 15 masses after initial nondiagnostic biopsy; 11 (73%) were malignant. Larger tumor size and a solid nature on imaging predicted a successful biopsy on multivariate analysis. Grade 1 complications were experienced in 10.1% of cases, with no major bleeding and no seeding of the biopsy tract. There was one grade 3a complication (0.3%).This is a retrospective study and some data are unavailable on factors that may affect biopsy success rates. Repeat biopsy was not standard practice prior to this analysis.

Conclusions

RTB can be performed safely and accurately in the investigation of renal masses ≤4 cm. A nondiagnostic biopsy should not be considered a surrogate for the absence of malignancy. Repeat biopsy can be performed with similar accuracy, providing a diagnosis for most patients.     

Patterns of renal disease in South Korea: a 20-year review of a single-center renal biopsy database

Background: Several registries and centers have reported the results of renal biopsies from different parts of the world. As there are few data regarding the epidemiology of glomerulonephritis (GN) in South Korea, we conducted this study on renal biopsy findings during the last 20 years from a single center.

Methods: Data for 818 patients who underwent renal biopsy at our center between 1992 and 2011 were collected retrospectively. All kidney specimens were examined with light microscopy (LM) and immunofluorescent microscopy (IF).

Results: There were 818 cases of native kidney biopsies. In cases of primary GN, the most frequent type of renal pathology in adults (18–59 years) was mesangial proliferative GN (MsPGN, 34.5%) followed by IgA nephropathy (IgAN, 33.3%) and membranous GN (MGN, 8.8%). Indications in adults (18–59 years) were asymptomatic urinary abnormalities (75.3%) followed by nephrotic syndrome (19.8%) and acute kidney injury (AKI, 3.4%).

Conclusions: Among 818 renal biopsy specimens, MsPGN and IgAN were the most frequent biopsy-proven renal diseases. MGN was the third most common cause of primary GN and lupus nephritis (LN) was the most common secondary glomerular disease. Our data contribute to the epidemiology of renal disease in South Korea.     

零点活检对活体肾移植术后受体肾功能的预测价值

目的探讨活体肾移植供肾零点活检对受体术后1年内移植肾功能的预测价值。方法 149例活体肾移植受者,根据是否同意活检和活检是否发现异常分为3组：未活检组（63例）,活检正常组（58例）和活检异常组（28例）。受体术后平均随访8个月,比较3组间受体术后移植肾功能恢复情况。结果供肾零点活检异常率为33%,其中肾小管炎7例,肾小管萎缩5例,肾小球硬化8例,肾小球钙化3例,肾小球玻璃样变3例,肾间质炎7例,肾间质纤维化1例,系膜增生2例以及小动脉玻璃样变2例（部分病例有一种以上病理改变）。供者年龄与移植前零点活检异常相关（P〈0.05）。从术后1个月之后至术后1年内,活检异常组各时间点受体血清肌酐均高于未活检组和活检正常组（均为P〈0.05）;术后3个月,活检异常组各时间点受体肾小球滤过率均低于未活检组和活检正常组（P〈0.05）,但术后1年内3组各随访时间点的血尿素氮比较差异无统计学意义（P〉0.05）。术后6个月内重复测量趋势分析显示,与活检正常组比较,活检异常组的血清肌酐和肾小球滤过率的变化趋势差异有统计学意义（均为P〈0.05）,活检异常组的血清肌酐与未活检组比较差异亦有统计学意义（P〈0.05）。结论活体供肾零点活检结果对术后1年内特别是术后6个月内移植肾功能有预测价值,具有临床实用性。     

Laparoscopic renal biopsy: a 9-year experience

OBJECTIVES: To present our experience and outcome of consecutive laparoscopic renal biopsy over a 9-year period, as renal biopsy remains an important diagnostic procedure for evaluating proteinuria, haematuria and renal failure, but when percutaneous biopsy is contraindicated, a laparoscopic biopsy is an attractive option because it is minimally invasive. PATIENTS AND METHODS: Seventy-four patients (29 male, 45 female, mean age 45 years, range 3-79) had a laparoscopic renal biopsy taken for various indications, e.g. morbid obesity, solitary kidney, coagulopathy, failed percutaneous biopsy, high location of the kidney and poor visualization with ultrasonography. The kidney was approached via a laparoscopic retroperitoneal route using a two-port technique, with the patient in the flank position. After identifying the kidney, one to five cortical biopsies were obtained with cup-biopsy forceps. RESULTS: Adequate tissue was obtained in 96% of the patients; the mean (range) operative duration was 123 (9-261) min and the estimated blood loss 67 (5-2000) mL. Forty-three patients were discharged within 24 h. Complications occurred in 10 patients, with significant bleeding in three. One patient died after surgery, secondary to a perforated peptic ulcer while on high-dose steroid therapy. CONCLUSION: Laparoscopic renal biopsy is a safe and effective alternative to open renal biopsy for patients in whom percutaneous biopsy is not feasible. It offers the advantage of obtaining cortical biopsies and achieving haemostasis under direct vision. Adequate renal tissue is obtained in most cases. Recovery and convalescence are short for most patients.     

152例老年肾脏病肾活检术的临床意义

目的探讨实时超声引导下自动活检枪经皮肾穿刺活检术在老年肾脏病中的临床意义及风险评估。方法回顾性分析152例老年肾脏病患者行肾自动活检术的成功率及并发症,并与同期2219例非老年组肾脏病患者进行比较。结果152例老年肾脏病患者肾活检均取得肾组织,其中取材不良6例（3．95％）,取材合格27例（17．76％）,取材良好119例（78．29％）,与非老年患者比较,无统计学差异（P〉0．05）;152例老年患者中21例出现轻度并发症（13．82％）,其中肉眼血尿7例,肾周血肿14例,无出现严重并发症,并发症发生率与非老年组无统计学差异（P〉0．05）;老年组通过。肾活检后修改诊断36例,诊断修正率为23．68％;根据病理结果修正治疗方案47例,治疗修正率为30．92％。结论超声引导自动肾活检术在老年肾脏病患者中应用成功率高且安全;肾活检病理诊断对老年肾脏疾病的诊治有重要价值,值得进一步推广应用。     

糖尿病合并肾脏损害患者肾活检的临床意义

糖尿病肾脏疾病(DKD)是导致慢性肾衰竭的主要原因,其中2型糖尿病所致的肾脏病变占绝大多数。肾活检病理检查是诊断的"金标准",对患者治疗方案的选择及预后判断具有重要价值,对新药的开发具有重要意义,也是DKD流行病学调查、确定临床病理联系和开发无创诊断方法的重要依据。因此,对糖尿病尤其是2型糖尿病合并肾脏损害的患者积极开展肾活检病理检查具有重要的临床意义。     

Epidemiology of renal disease in Romania: a 10 year review of two regional renal biopsy databases.

BACKGROUND: Epidemiological data of renal disease are available from large national renal biopsy registries from Central and Western European countries; in contrast, detailed epidemiological data from Eastern European countries are missing. This report is the first review of histological data, over a period of 10 years (1995-2004), covering a population of over 6 million inhabitants and two distinct regions from an East European country - Romania. METHODS: 635 eco-guided kidney biopsies from the Moldova (North-Eastern Romania, 8 counties, 4 754 048 inhabitants) and Banat (Western Romania, 3 counties, 1 454 747 inhabitants) regions were analysed. Data on serum creatinine concentration (sCr), 24 h proteinuria, haematuria, clinical diagnosis, histological diagnosis and complications after renal biopsy were collected. RESULTS: The number of biopsies performed varied between 10.9 p.m.p./year in 1995 and 11.3 p.m.p./year in 2004. The most common clinical syndromes - as indication for performing the renal biopsy - were: nephrotic syndrome (52.3%), followed by nephritic syndrome (21.9%), acute renal failure (ARF) (12.4%), chronic kidney disease (CKD) (10.2%) and asymptomatic urinary abnormalities (AUA) (3.3% of the cases). The major histological groups identified were: primary glomerulonephritis (GN) (66.2%), secondary GN (26.4%), vascular nephropathies (2.3%), and tubulointerstitial nephropathies (TIN) (1.5%) of the cases. Among primary GN's, the most frequent diagnoses were: membranoproliferative GN (MPGN) (29.4%, incidence in 2004 - 9.3 p.m.p./year), mesangioproliferative GN (MesGN) (28.9%, incidence - 10 p.m.p./year), membranous GN (MGN) (11.2%, incidence - 5.3 p.m.p./year), minimal change disease (MCD) (8.5%, incidence - 7.3 p.m.p./year), focal and segmental glomerulosclerosis (FSGS) (11.5%, incidence - 3.3 p.m.p./year) and crescentic GN (CGN) (7.9%, incidence - 3.3 p.m.p./year). The prevalence of membranoproliferative GN significantly decreased from 1995 to 2004. The prevalence of different types of secondary GN was similar to Western and Central European countries, with the particular difference of higher infectious diseases associated GN. CONCLUSION: The present data are an important contribution to the epidemiology of renal diseases in Europe, highlighting not only numerous similarities but also significant epidemiological differences in Western and Central European countries, particularly a higher, albeit declining, incidence and prevalence of membranoproliferative GN. This report represents the basis for the future of Romanian Registry of Renal Biopsies and is intended to serve as a source of information for nephrologists concerned with East European renal pathology.     

经皮肾穿刺活检术中的临床应用

经皮肾穿刺活检术是较为安全、准确的肾肿瘤诊断方法。良性肾肿瘤通常无需手术治疗,穿刺活检术可以用于良性肾肿瘤的诊断,使患者避免不必要的外科治疗。经皮肾穿刺活检能明确肿瘤性质,为临床医师选择合理的治疗方案提供重要依据。目前经皮肾穿刺活检也应用于射频消融治疗肾肿瘤术后病灶残留或复发的评估与确诊。本文就经皮肾穿刺活检的诊断效果、适应证及风险作一综述。     

Peripheral arterial disease as a predictor of outcome after renal transplantation

Abstract Our aim was to assess the prevalence of symptomatic and asymptomatic peripheral occlusive arterial disease (POAD) in 129 consecutive diabetic ( n = 34) and non-diabetic ( n = 95) patients undergoing renal transplantation. The association of pre-existent POAD and complaints of claudication, lower limb amputations, and graft and patient survival were evaluated during a 5-year follow up. A questionnaire on walking capacity, ankle/brachial (ABI) and toe/brachial (TBI) pressure indices as well as the pulse volume recording (PVR) at the ankle were used to assess resting haemodynamics and the presence of POAD 4 days after the transplantation. Unquestionable ischaemia was encountered in 5 (4 %) patients all with a history of intermittent claudication and an ABI equal or below 0.77. While using assessment methods not affected by vessel calcification, i.e. toe pressures and PVR damping, a many-fold frequency of arterial disease was observed when compared to previous studies. TBI below 0.65 was found in 11 of diabetic (32 %) and in 15 of the others (16%), and a PVR amplitude below 5 min in 28 of diabetics (82 %) and in 34 of non-diabetics (36 %). During the 5-year follow up, abnormal TBI and PVR values and diabetes at the time of transplantation were the greatest risk factors for proximal foot amputations. The low TBI levels also indicated a shortened patient survival. However, transplant function was not affected by the presence of abnormal haemodynamic indices at the time of transplantation.     

Comparison of two core biopsy techniques before and after laparoscopic cryoablation of small renal cortical neoplasms

Introduction:

Cryoablation is an acceptable treatment option for small renal cortical neoplasms (RCN). Unlike extirpative interventions, intraoperative needle biopsy is the only pathologic data for ablated tumors. It is imperative that sampled tissue accurately captures pathology. We studied the optimal intraoperative needle core biopsy protocol for small RCN during laparoscopic renal cryoablation (LCA).

Methods:

Patients with RCN<4cm underwent intraoperative biopsy during LCA. Four biopsy cores were taken per tumor, 2 before and 2 after LCA by using both a standard and modified technique. Standard technique: needle biopsy device was deployed after insertion into the renal tissue at a depth of 5mm. Modified technique: needle biopsy device was deployed 1mm outside of the renal tissue. Biopsies were examined and compared with reference standard pathology. Percentage agreement was calculated across biopsy types (standard vs. modified) and time points (pre- vs. postcryoablation). Logistic regression was used to identify factors impacting biopsy accuracy.

Results:

Thirty patients with 33 RCNs underwent LCA. The mean patient age was 69.1±8.0yrs, and mean tumor size was 2.3±0.7cm. No significant bleeding resulted from biopsies. A definitive diagnosis was made in 31/33 RCNs (94.0%). Ten tumors (30.3%) were benign, 21 (63.7%) were malignant, and 2 (6.0%) were nondiagnostic. Biopsy length was significantly longer using the standard vs. modified technique with mean lengths of 9.3mm vs. 7.0mm, respectively (P=.02). Highest agreement was seen in preablation biopsies (90.3%). A significant association with agreement was seen for younger age (P=.05) and larger tumor size (P=.02).

Conclusions:

Younger age and larger tumor size were associated with improved accuracy. Preoperative sampling resulted in superior accuracy and the standard technique resulted in significantly longer cores. Use of preablation standard biopsy technique may result in the most accurate pathologic diagnosis for patients undergoing cryoablation for small RCNs.     

Repeat renal biopsy in a girl with tubulointerstitial nephritis and uveitis syndrome

A Japanese girl aged 8 years who presented with a 2-month history of uveitis subsequently developed tubulointerstitial nephritis. A percutaneous renal biopsy revealed massive interstitial mononuclear cell infiltrates consisting of CD4-positive T cells. Despite administration of topical corticosteroids, the ocular symptoms persisted. Systemic corticosteroid therapy dramatically reduced the ocular symptoms and urinary β₂-microglobulin (β 2MG) concentration. However, reducing the prednisolone dosage induced recurrence of uveitis associated with increased levels of urinary β 2MG. The CD4-positive T cell infiltration persisted in the second renal biopsy performed 6 months after the first renal biopsy. These observations suggest that the interstitial cell infiltration persists for a relatively long time in a proportion of patients with tubulointerstitial nephritis and uveitis syndrome (TINU). Although the renal outcome of TINU has been reported to be favorable, prolonged interstitial cell infiltration may affect long-term renal outcome. Selected patients with TINU should be followed with close observation. Received: 7 February 2001 / Revised: 8 June 2001 / Accepted: 27 June 2001     

Long-term impact of subclinical inflammation diagnosed by protocol biopsy one year after renal transplantation

The long-term impact of subclinical acute rejection (SCAR) on renal graft function remains poorly understood. Furthermore, the interpretation of borderline lesions is difficult and their incidence is variable. The aim of this study was to analyze the characteristics of subclinical inflammation (SCI) in protocol biopsies performed 1-year after renal transplantation. SCI was defined as the presence of borderline lesions or SCAR according to the Banff 2005 classification. The patients included were a subpopulation of the CONCEPT study in which patients were randomized 3 months after transplantation to receive either sirolimus (SRL) or cyclosporine A (CsA) in combination with mycophenolate mofetil. At 1 year, we observed SCI in 37 of the 121 patients observed with an evaluable biopsy. The incidence was more frequent in the SRL group (SRL 45.2% vs. CsA 15.3%). At 30 months , SCI was associated with a significantly lower level of estimated glomerular filtration rate (mean MDRD 50.8 [±13.3] vs. 57.7 [±16.3] mL/min/1.73 m(2) , p = 0.035). In conclusion, SCI at 1-year posttransplantation is associated with worsening renal function and is more frequent in SRL-treated patients. Therefore, evaluation of SCI may be a valuable tool to allow the optimization of immunosuppressive regimens.