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Fraga Dias B, Marques R, Faria V, Domingues P, Ribeiro C, Silvano J, Malheiro J, Almeida M, Pedroso S, Martins LS. Renal Artery Stenosis in Living Donor Kidney Transplantation: A Rare Cause of "Flash Edema". Transplant Proc 2024:S0041-1345(24)00010-1. [PMID: 38355372 DOI: 10.1016/j.transproceed.2024.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 01/16/2024] [Indexed: 02/16/2024]
Abstract
Transplant renal artery stenosis (TRAS) is a well-recognized vascular complication after kidney transplantation, with an incidence ranging from 1% to 23%. TRAS often presents with clinical features such as refractory hypertension, de novo hypertension, allograft dysfunction, and the presence of a bruit over the graft. A rare manifestation of TRAS is flash pulmonary edema. Here, we present a case of a 37-year-old male who received a living donor kidney. Four years after the transplant, he presented with acute kidney injury, hypertensive crisis, and flash pulmonary edema. Initially, methylprednisolone pulses were administered due to suspicion of acute rejection, which was later ruled out after a kidney graft biopsy. Computed tomography angiography showed findings suggesting stenosis or thrombus in the renal artery. The patient developed sudden acute pulmonary edema, requiring hemodialysis, with notable clinical improvement. Subsequently, stent placement was performed without complications, resulting in the complete recovery of renal function and effective blood pressure control. The incidence of renal artery stenosis is higher in living donor kidney transplantation, mainly due to technical complexities during surgery. Acute presentations, such as flash edema, are exceptionally rare but can occur years after transplantation. Prompt intervention can lead to favorable outcomes.
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Affiliation(s)
- Bruno Fraga Dias
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal.
| | - Roberto Marques
- Nephrology Department, Centro Hospitalar Universitário do Algarve, Faro, Portugal
| | - Vitória Faria
- Nephrology Department, Centro Hospitalar Vila de Gaia/Espinho, Vila Nova de Gaia, Portugal
| | | | - Catarina Ribeiro
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal
| | - José Silvano
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal
| | - Jorge Malheiro
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal; UMIB-Unit for Multidisciplinary Research in Biomedicine, ICBAS - School of Medicine and Biomedical Sciences, Universidade do Porto, Porto, Portugal
| | - Manuela Almeida
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal; UMIB-Unit for Multidisciplinary Research in Biomedicine, ICBAS - School of Medicine and Biomedical Sciences, Universidade do Porto, Porto, Portugal
| | - Sofia Pedroso
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal; UMIB-Unit for Multidisciplinary Research in Biomedicine, ICBAS - School of Medicine and Biomedical Sciences, Universidade do Porto, Porto, Portugal
| | - La Salete Martins
- Nephrology Department, Centro Hospitalar Universitário de Santo António, Porto, Portugal; UMIB-Unit for Multidisciplinary Research in Biomedicine, ICBAS - School of Medicine and Biomedical Sciences, Universidade do Porto, Porto, Portugal
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Verloh N, Doppler M, Hagar MT, Kulka C, von Krüchten R, Neubauer J, Weiß J, Röthele E, Schneider J, Jänigen B, Uller W. Interventional Management of Vascular Complications after Renal Transplantation. ROFO-FORTSCHR RONTG 2023; 195:495-504. [PMID: 36863368 DOI: 10.1055/a-2007-9649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
BACKGROUND Kidney transplantations are increasing due to demographic changes and are the treatment of choice for end-stage renal disease. Non-vascular and vascular complications may occur in the early phase after transplantation and at later stages. Overall postoperative complications after renal transplantations occur in approximately 12 % to 25 % of renal transplant patients. In these cases, minimally invasive therapeutic interventions are essential to ensure long-term graft function. This review article focuses on the most critical vascular complications after renal transplantation and highlights current recommendations for interventional treatment. METHOD A literature search was performed in PubMed using the search terms "kidney transplantation", "complications", and "interventional treatment". Furthermore, the 2022 annual report of the German Foundation for Organ Donation and the EAU guidelines for kidney transplantation (European Association of Urology) were considered. RESULTS AND CONCLUSION Image-guided interventional techniques are favorable compared with surgical revision and should be used primarily for the treatment of vascular complications. The most common vascular complications after renal transplantation are arterial stenoses (3 %-12.5 %), followed by arterial and venous thromboses (0.1 %-8.2 %) and dissection (0.1 %). Less frequently, arteriovenous fistulas or pseudoaneurysms occur. In these cases, minimally invasive interventions show a low complication rate and good technical and clinical results. Diagnosis, treatment, and follow-up should be performed in an interdisciplinary approach at highly specialized centers to ensure the preservation of graft function. Surgical revision should be considered only after exhausting minimally invasive therapeutic strategies. KEY POINTS · Vascular complications after renal transplantation occur in 3 % to 15 % of patients.. · Image-guided interventional procedures should be performed primarily to treat vascular complications of renal transplantation.. · Minimally invasive interventions have a low complication rate with good technical and clinical outcomes.. CITATION FORMAT · Verloh N, Doppler M, Hagar MT et al. Interventional Management of Vascular Complications after Renal Transplantation. Fortschr Röntgenstr 2023; DOI: 10.1055/a-2007-9649.
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Affiliation(s)
- Niklas Verloh
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Michael Doppler
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Muhammad Taha Hagar
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Charlotte Kulka
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Ricarda von Krüchten
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Jakob Neubauer
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Jakob Weiß
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
| | - Elvira Röthele
- Department of Medicine IV, Medical Center-University of Freiburg, Germany
| | - Johanna Schneider
- Department of Medicine IV, Medical Center-University of Freiburg, Germany
| | - Bernd Jänigen
- Department of General and Visceral Surgery, Medical Center-University of Freiburg, Germany
| | - Wibke Uller
- Department of Diagnostic and Interventional Radiology, Medical Center-University of Freiburg, Germany
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Fananapazir G, LaRoy JR, Navarro SM, Corwin MT, Carney B, Troppmann C. Ultrasound Screening for Transplant Renal Artery Stenosis Risk Stratification Using Standardized Criteria in Structured Reporting: A Validation Study. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2022; 41:1433-1438. [PMID: 34536039 DOI: 10.1002/jum.15826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 08/27/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
OBJECTIVES To evaluate the effectiveness of templated ultrasound reports using transplant renal artery stenosis (TRAS) risk stratification (RS), particularly with regard to utilization of downstream angiographic studies and angiographic presence of TRAS. METHODS Ultrasounds with TRAS-RS templated reports from August 2017 to May 2020 were included. Studies were excluded if performed <28 days posttransplant and where TRAS was not clinically considered. A total of 530 ultrasounds met inclusion/exclusion criteria. TRAS-RS criteria were recorded (renal artery velocity ≥300 cm/s, spectral broadening in the renal artery, and intraparenchymal acceleration time ≥0.1 second). Depending on the number of criteria present, recipients were stratified into low (0/3), intermediate (1/3), high (2/3), and very high (3/3) risk for TRAS. Student's t-test was performed to identify whether the TRAS-RS category was associated with 1) performance of angiography to assess for TRAS and 2) angiographic presence of TRAS. RESULTS Of the 530 ultrasounds, 74 (14%) underwent angiography. Of these, 41 (55%) were positive for TRAS (overall positive rate, 8%). Number of ultrasounds, angiograms, and angiograms positive for TRAS, respectively, in each of the TRAS-RS categories for the 530 cases were: low probability: n = 370 (70% of all studied reports), 7 angiograms (2%), and 0 (0%) positive for TRAS; intermediate: n = 87 (16%), 24 angiograms (28%), and 8 (33%) positive; high: n = 46 (9%), 23 angiograms (50%), and 14 (61%) positive; and very high: n = 27 (5%), 20 angiograms (74%), and 19 (95%) positive. TRAS-RS score was associated with subsequent performance of angiography and positive rate for TRAS (P < .01). CONCLUSION Implementing a defined ultrasound screening tool with templated reporting for TRAS allowed for effective selection of those requiring an angiogram.
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Affiliation(s)
| | - Jennifer R LaRoy
- Department of Radiology, University of California Davis, Davis, Sacramento, CA, USA
| | - Shannon M Navarro
- Department of Radiology, University of California Davis, Davis, Sacramento, CA, USA
| | - Michael T Corwin
- Department of Radiology, University of California Davis, Davis, Sacramento, CA, USA
| | - Benjamin Carney
- Department of Radiology, University of California Davis, Davis, Sacramento, CA, USA
| | - Christoph Troppmann
- Department of Surgery, University of California Davis, Davis, Sacramento, CA, USA
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Safety And Efficacy of Drug Eluting Stents for Treatment of Transplant Renal Artery Stenosis. Ann Vasc Surg 2022; 87:245-253. [DOI: 10.1016/j.avsg.2022.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/09/2022] [Accepted: 03/29/2022] [Indexed: 11/20/2022]
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Assessment and management of transplant renal artery stenosis. A literature review. Ann Vasc Surg 2022; 82:13-29. [PMID: 35108560 DOI: 10.1016/j.avsg.2022.01.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 01/07/2022] [Accepted: 01/10/2022] [Indexed: 12/13/2022]
Abstract
BACKGROUND transplant renal artery stenosis (TRAS) following kidney transplantation is a possible cause of graft failure. This review aimed to summarize the evidence about physiopathology, diagnosis and early and late effectiveness of the endovascular treatment (EVT), including angioplasty and stenting procedures. METHODS a literature research was performed using Pubmed, Scopus and the Cochrane Library databases (January 2000 to September 2020) according to PRISMA guidelines. Studies were included if they describe EVT, percutaneous transluminal angioplasty or stent placement of TRAS, published in English and with a minimum of ten patients. RESULTS 56 studies were included. TRAS incidence ranges from 1% up to 12% in transplanted kidneys. The TRAS risk factors were: elderly donor and recipient, cytomegalovirus match status, Class II Donor Specific Antibodies (DSA), expanded donor criteria, delayed graft functioning and other anatomical and technical factors. The highest frequency of TRAS presentation is after 3-6 months after kidney transplantation. The most frequent localization of stenosis was para-anastomotic (ranging from 25% to 78%). In 9 studies, all patients were treated by percutaneous transluminal angioplasty (PTA), in 16 studies all patients received percutaneous transluminal stenting (PTS) and in 21 series patients received either PTA or PTS. The Twelve months patency rates after EVT ranged from 72% to 94%. The overall complication rate was 9%, with pseudoaneurysms and hematomas as most frequent complications. CONCLUSION TRAS can be successfully and safely treated through an endovascular approach. Stent delivery seems to guarantee a higher patency rate compared to simple angioplasty, however further studies are needed to confirm these results.
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6
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Kanhouche G, Santos GRF, Orellana HC, Galhardo A, Faccinetto ACB, Barteczko MLM, de Carvalho LSF, Taddeo JB, Foresto RD, Moises VA, Tedesco-Silva H, Pestana JM, Barbosa AHP. Risk factors of transplant renal artery stenosis in kidney transplant recipients. Clinics (Sao Paulo) 2022; 77:100087. [PMID: 35931001 PMCID: PMC9350869 DOI: 10.1016/j.clinsp.2022.100087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 01/14/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Transplant Renal Artery Stenosis (TRAS) is a recognized vascular complication after kidney transplantation. The overall risk predictors of TRAS are poorly understood. METHODS Retrospective analysis of patients with suspected TRAS (Doppler ultrasound PSV > 200 cm/s) who underwent angiographic study in a single center between 2007 and 2014. All patients with stenosis > 50% were considered with TRAS. Stenosis restricted in the body of the artery was also analyzed in a subgroup. RESULTS 274 patients were submitted to a renal angiography and 166 confirmed TRAS. TRAS group featured an older population (46.3 ± 11.0 vs. 40.9 ±14.2 years; p = 0.001), more frequent hypertensive nephropathy (30.1% vs. 15.7%; p = 0.01), higher incidence of Delayed Graft Function (DGF) (52.0% vs. 25.6%; p < 0.001) and longer Cold Ischemia Time (CIT) (21.5 ± 10.6 vs. 15.7 ± 12.9h; p < 0.001). In multivariable analyses, DGF (OR = 3.31; 95% CI 1.78‒6.30; p < 0.0001) was independent risk factors for TRAS. DM and CIT showed a tendency towards TRAS. The compound discriminatory capacity of the multivariable model (AUC = 0.775; 95% CI 0.718‒0.831) is significantly higher than systolic blood pressure and creatinine alone (AUC = 0.62; 95% CI 0.558-0.661). In body artery stenosis subgroup, DGF (OR = 1.86; 95% CI 1.04‒3.36; p = 0.03) and Diabetes Mellitus (DM) (OR = 2.44; 95% CI 1.31‒4.60; p = 0.005) were independent risk factors for TRAS. CONCLUSION In our transplant population, DGF increased more than 3-fold the risk of TRAS. In the subgroup analysis, both DGF and DM increases the risk of body artery stenosis. The addition of other factors to hypertension and renal dysfunction may increase diagnostic accuracy. TRAS TRIAL REGISTRED: clinicaltrials.gov (n° NCT04225338).
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Affiliation(s)
- Gabriel Kanhouche
- Cardiology Division, Hospital São Paulo, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
| | | | - Henry Campos Orellana
- Cardiology Division, Hospital São Paulo, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Attilio Galhardo
- Cardiology Division, Hospital São Paulo, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | | | | | | | - Julia Bernardi Taddeo
- Nephrology Division, Hospital do Rim, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Renato Demarchi Foresto
- Nephrology Division, Hospital do Rim, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Valdir Ambrósio Moises
- Cardiology Division, Hospital São Paulo, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - Helio Tedesco-Silva
- Nephrology Division, Hospital do Rim, Universidade Federal de São Paulo, São Paulo, SP, Brazil
| | - José Medina Pestana
- Nephrology Division, Hospital do Rim, Universidade Federal de São Paulo, São Paulo, SP, Brazil
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Hinojosa-Gonzalez DE, Salgado-Garza G, Torres-Martinez M, Villegas-De Leon SU, Bueno-Gutierrez LC, Herrera-Carrillo FE, Gonzalez-Urquijo M, Segura Ibarra V, Fabiani MA, Flores-Villalba E. Endovascular Treatment of Transplant Renal Artery Stenosis: A Systematic Review and Meta-analysis. J Endovasc Ther 2021; 29:294-306. [PMID: 34399594 DOI: 10.1177/15266028211038593] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE Endovascular treatment through either percutaneous transluminal angioplasty (PTA) alone or stenting has been previously used as a treatment for transplant renal artery stenosis (TRAS). This review aimed to investigate the results of endovascular treatment for renal artery stenosis in transplanted kidneys as compared with the outcomes of interventions, medical management, and graft survival in non-TRAS patients. METHODS A systematic review of PubMed, Google Scholar, Cochrane, and Scopus was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines in which studies that reported outcomes of the treatment of TRAS via the endoluminal approach were identified, and their results were meta-analyzed. RESULTS Fifty-four studies with a total of 1522 patients were included. A significant reduction of serum creatinine level was found, favoring the stenting group, with a mean difference of 0.68 mg/dL (95% confidence interval (CI), 0.17-1.19; Z=2.60, p=0.0009). Comparison of pre- and post-intervention values of any intervention revealed a significant decrease in overall serum creatinine level (0.65 mg/dL; 95% CI, 0.40-0.90; Z=5.09, p=0.00001), overall blood pressure, with a mean difference of 11.12 mmHg (95% CI, 7.29-14.95; Z=5.59, p=0.00001), mean difference in the use of medications (0.77; 95% CI, 0.29-1.24; p=0.002), and peak systolic velocity (190.05; 95% CI, 128.41-251.69; p<0.00001). The comparison of serum creatinine level between endovascular interventions and best medical therapy favored endovascular intervention, with a mean difference of 0.23 mg/dL (95% CI, 0.14-0.32; Z=5.07, p<0.00001). Graft survival was similar between the treated patients and those without TRAS (hazard ratio, 0.98; 95% CI, 0.75-1.28; p=0.091). The overall pooled success rate was 89%, and the overall complication rate was 10.4%, with the most prevalent complication being arterial dissection. CONCLUSION The endovascular treatment of TRAS improves graft preservation and renal function and hemodynamic parameters. PTA + stenting appears to be a more effective option to PTA alone in the stabilization of renal function, with additional benefits from decreased restenosis rates. Further high-quality studies could expand on these findings.
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Affiliation(s)
| | - Gustavo Salgado-Garza
- Escuela de Medicina y Ciencias de la Salud, Tecnologico de Monterrey, Monterrey, NL, Mexico
| | | | | | | | | | | | - Victor Segura Ibarra
- Escuela de Medicina y Ciencias de la Salud, Tecnologico de Monterrey, Monterrey, NL, Mexico.,Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Monterrey, NL, Mexico
| | | | - Eduardo Flores-Villalba
- Escuela de Medicina y Ciencias de la Salud, Tecnologico de Monterrey, Monterrey, NL, Mexico.,Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Monterrey, NL, Mexico
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8
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Kim Y, Kim MH, Hwang JK, Park SC, Kim JI, Jun KW. Endovascular treatment for transplant renal artery stenosis: A retrospective cohort study. Medicine (Baltimore) 2021; 100:e26935. [PMID: 34397942 PMCID: PMC8360457 DOI: 10.1097/md.0000000000026935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 07/27/2021] [Indexed: 01/04/2023] Open
Abstract
Transplant renal artery stenosis (TRAS) is the most common (1%-23%) vascular complication following kidney transplantation. The aim of this study was to review our experience with an endovascular approach to treat TRAS.We retrospectively reviewed kidney transplant recipients who underwent percutaneous transluminal angioplasty (PTA) due to TRAS in our institute from January 2009 to December 2015. We analyzed the patient's baseline characteristics, postoperative renal function, blood pressure evolution, and the number of pre- and post-procedure antihypertensive drugs.A total of 21 patients (15 men, 6 women) were treated with the endovascular technique. The predominant presentation was graft dysfunction (76.2%). Stenosis or hemodynamic kinking was located at the anastomosis in 7 (33.3%) patients, proximal to the anastomosis in 13 (61.9%) patients, and distal the anastomosis in 1 (4.8%) patient. PTA without stent placement was performed in 7 patients (33.3%), and PTA with stent placement was performed in 14 patients (67.7%). Serum creatinine levels demonstrated no difference between the pre-procedure level and that on discharge day (1.61 mg/dl [0.47-3.29 mg/dl] vs 1.46 mg/dl [0.47-3.08 mg/dl]; P = .33). The glomerular filtration rate also showed no difference between the pre-procedure value and that on discharge day (53.6 ml/min [22.4-145.7 ml/min] vs 57.0 ml/min [17.56 -145 ml/min]; P = .084). Systolic blood pressure and diastolic blood pressure (DBP) varied from 137 mm Hg (120-160 mm Hg) and 84 mm Hg (70-100 mm Hg) pre-procedure to 129 mm Hg (90-150 mm Hg) and 79 mm Hg (60-90 mm Hg) at discharge, respectively (P = .124 and P = .07). The number of antihypertensive medications significantly decreased from 1.5 (0-6) pre-procedure to 0.5 (0-2) at discharge (P = .023). In our study, there were no technical failures, procedure-related complications or deaths. During the follow-up period, the free-from-reintervention rate was 100%, and graft failures occurred in 2 patients (9.5%) due to rejection.Endovascular procedures for TRAS show a high technical success rate with a low complication rate and a low reintervention rate. PTA showed a trend toward a positive impact on lowering serum creatinine, systolic blood pressure, and diastolic blood pressure and improving estimated glomerular filtration rate, and the number of antihypertensive medications could be significantly reduced after this procedure.
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Affiliation(s)
- Youngmin Kim
- Department of Surgery, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Mi Hyeong Kim
- Department of Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jeong Kye Hwang
- Department of Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sun Cheol Park
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ji Il Kim
- Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Kang Woong Jun
- Department of Surgery, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Wongpraparut N, Chaipruckmalakarn T, Tongdee T, Jaspttananon A, Vongwiwatana A, Premasathian N, Anusonadisai K, Pongakasira R. Long-term outcome of percutaneous transluminal renal angioplasty (PTRA) versus PTRA with stenting (PTRAS) in transplant renal artery stenosis. BMC Cardiovasc Disord 2021; 21:212. [PMID: 33902459 PMCID: PMC8077892 DOI: 10.1186/s12872-021-02015-4] [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: 08/18/2020] [Accepted: 04/15/2021] [Indexed: 11/23/2022] Open
Abstract
Background Endovascular treatment is standard of care for transplant renal artery stenosis (TRAS). No study has evaluated long-term outcomes compared between percutaneous transluminal renal angioplasty (PTRA) and PTRA with stenting (PTRAS). Accordingly, this study aimed to investigate the 1-year clinical success, and short- and long-term event-free survival between PTRA and PTRAS in patients diagnosed with TRAS at Thailand’s largest national tertiary referral center. Methods This single-center retrospective study included kidney transplant patients treated for TRAS during January 2001 to June 2019. Clinical success was defined as (1) increase in estimated glomerular filtration rate (eGFR) > 15%, or (2) reduction in mean arterial pressure (MAP) > 15% with no decrease in antihypertensive medication, or no reduction in MAP or reduction in MAP < 15% with decrease in antihypertensive medication. Incidence of kidney transplant graft failure and transplant renal artery stenosis were also collected. Results Sixty-five cases of TRAS were identified from 1072 patients who underwent kidney transplantation. The majority (98.5%) had end-to-side anastomosis technique. Thirty-four patients had PTRA, while 31 patients had PTRAS. One-year clinical success according to renal outcome and BP reduction was 78.5% and 49.2%, respectively. Both renal outcome (79.4% vs. 77.4%, p = 0.845) and BP reduction (40.6% vs. 58.1%, p = 0.166) at 1 year were similar between the PTRA and PTRAS groups. Compared between PTRA and PTRAS, event-free survival for composite of kidney transplant graft failure or transplant renal artery restenosis was significantly higher for PTRAS at 1 year (82.4% vs. 100%, p = 0.025), but not significantly different at 10 years (73.5% vs. 71%, p = 0.818). Conclusions We demonstrated the 1-year clinical success, and short- and long-term event-free survival between PTRA and PTRAS in TRAS patients. One-year clinical success was found to be similar between groups. Event-free survival for composite of kidney transplant graft failure or transplant renal artery restenosis was significantly higher in PTRAS at 1 year, but similar between groups at 10 years. Trial registration Thai Clinical Trials Registry, TCTR20200626002. Registered 26 June 2020—Retrospectively registered, http://www.clinicaltrials.in.th/index.php?tp=regtrials&menu=trial search&smenu = fulltext&task = search&task2 = view1&id = 6441
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Affiliation(s)
- Nattawut Wongpraparut
- Division of Cardiology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand.
| | - Thunyarat Chaipruckmalakarn
- Division of Cardiology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand
| | - Thongtum Tongdee
- Interventional Radiology Unit, Department of Radiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Archan Jaspttananon
- Division of Cardiology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand
| | - Attapong Vongwiwatana
- Division of Nephrology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Nalinee Premasathian
- Division of Nephrology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Kawin Anusonadisai
- Division of Cardiology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand
| | - Rungtiwa Pongakasira
- Her Majesty's Cardiac Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
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10
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Montali F, Panarese A, Binda B, Lancione L, Pisani F. Transplant Renal Artery Stenosis: A Case Report of Functional Recovery Six Months After Angioplasty. Transplant Proc 2021; 53:1272-1274. [PMID: 33894988 DOI: 10.1016/j.transproceed.2021.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 03/17/2021] [Indexed: 10/21/2022]
Abstract
Transplant renal artery stenosis (TRAS) is a common vascular complication after kidney transplantation, leading to worsening or refractory hypertension, deterioration in renal function, and possible cause of graft loss. Early diagnosis and an appropriate treatment are crucial for organ preservation. Endovascular treatment, including percutaneous transluminal angioplasty and stent implantation, is considered the first-line therapy for TRAS. Here we report the case of a 69-year-old woman with end-stage renal disease for chronic kidney disease not biopsy proven, who underwent a kidney transplant from expanded criteria donors on December 2018. Postoperative course was characterized by delayed graft function. Doppler ultrasonography (US) showed an increase of peak systolic velocity at the origin of the renal artery, and parvus-tardus waveform in periferic graft arteries and an abdominal computed tomography scan confirmed a stenosis at the origin of the main renal artery (TRAS). The patient underwent a percutaneous transluminal angioplasty. It was not possible to place a stent at the particular location of the stenosis at the anastomosis. Despite the improvement of the graft's perfusion, monitored with Doppler US, the patient showed a very poor improvement in renal function and remained on hemodialysis for months. A percutaneous needle biopsy reported a normal renal parenchyma and excluded acute rejection. During this period, the patient received immunosuppressive therapy. About 6 months after the transplant, the patient had an unexpected and slow renal function recovery until she was weaned completely from hemodialysis.
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Affiliation(s)
- Filippo Montali
- General and Transplant Surgery Department, University of L'Aquila, L'Aquila, Italy
| | - Alessandra Panarese
- General and Transplant Surgery Department, University of L'Aquila, L'Aquila, Italy.
| | - Barbara Binda
- General and Transplant Surgery Department, San Salvatore Hospital, L'Aquila, Italy
| | - Laura Lancione
- General and Transplant Surgery Department, San Salvatore Hospital, L'Aquila, Italy
| | - Francesco Pisani
- General and Transplant Surgery Department, University of L'Aquila, L'Aquila, Italy; General and Transplant Surgery Department, San Salvatore Hospital, L'Aquila, Italy
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11
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Vijayvergiya R, Kasinadhuni G, Bootla D, Rajan P, Sharma A, Lal A. Intravascular ultrasound-supported percutaneous angioplasty of post-kidney transplant renal artery bifurcation stenosis. Vascular 2021; 30:167-170. [PMID: 33730955 DOI: 10.1177/17085381211001176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Transplant renal artery stenosis (TRAS) is an uncommon complication following renal transplantation. Its usual clinical presentation includes worsening hypertension and/or renal function, without any evidence of graft rejection. Bifurcation renal artery stenosis of the transplanted renal artery is rarely encountered. METHODS Percutaneous transluminal renal angioplasty (PTRA) with or without stenting is the procedure of choice to treat TRAS. We hereby describe a patient, who presented with impaired renal functions, four months following the renal transplantation. He underwent intravascular ultrasound-guided PTRA of the bifurcation lesion of TRAS.Results and conclusion: Superior renal artery had coronary drug-eluting stent implantation, while inferior renal artery and side branch of the superior renal artery had balloon angioplasty, alone. Post-intervention, the raised serum creatinine level decreased from 2.9 mg% to 1.7 mg%. The index case described the successful PTRA and stenting of the bifurcation lesion of TRAS, the technical results of which was optimized with the use of intravascular ultrasound.
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Affiliation(s)
- Rajesh Vijayvergiya
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Ganesh Kasinadhuni
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Dinakar Bootla
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Palanivel Rajan
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Ashish Sharma
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Anupam Lal
- Department of Cardiology, Renal Transplant Surgery, Radio-diagnosis, Post Graduate Institute of Medical Education & Research, Chandigarh, India
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12
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Transplant renal artery and vein occlusion evaluated with ferumoxytol-enhanced magnetic resonance angiography. Clin Imaging 2021; 77:142-146. [PMID: 33684787 DOI: 10.1016/j.clinimag.2021.02.022] [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: 12/15/2020] [Revised: 02/06/2021] [Accepted: 02/10/2021] [Indexed: 11/24/2022]
Abstract
BACKGROUND Compromise of the transplanted vasculature accompanying a kidney allograft can lead to graft failure if not diagnosed and treated expeditiously. Location of the vascular defect in the transplant renal artery or vein is difficult to anticipate, given the variety of etiologies. However, early diagnosis can anticipate further progression of kidney allograft dysfunction. Ferumoxytol-enhanced magnetic resonance angiography (FeMRA) can precisely localize lesions in both the transplant renal artery and vein and provide a comprehensive survey of the vascular conduits of concern. It avoids complications of kidney injury associated with intravenous iodinated contrast that may amplify a diagnosis of delayed graft function or further impair an allograft already compromised by donor-derived vascular disease. METHODS We report a case of concomitant and irreversible proximal transplant renal artery and vein stenosis diagnosed by FeMRA and treated with surgical intervention. RESULTS AND CONCLUSIONS FeMRA offers a rapid, non-invasive approach to simultaneously diagnose compromised blood flow through the transplant artery and or vein in preparation for definitive correction of the defect.
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13
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Gunawansa N, Aziz D, Sharma A, Halawa A. Transplant renal artery stenosis: urgent and judicious to avoid disaster; A narrative review. INDIAN JOURNAL OF TRANSPLANTATION 2021. [DOI: 10.4103/ijot.ijot_108_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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14
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Wasnik AP, Aslam AA, Millet JD, Pandya A, Bude RO. Multimodality imaging of pancreas-kidney transplants. Clin Imaging 2020; 69:185-195. [PMID: 32866771 DOI: 10.1016/j.clinimag.2020.07.028] [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: 06/04/2020] [Revised: 07/08/2020] [Accepted: 07/27/2020] [Indexed: 10/23/2022]
Abstract
Simultaneous pancreas-kidney transplant remains a treatment option for patients with insulin-dependent diabetes mellitus type 1, aimed at restoring normoglycemia, alleviating insulin dependency, avoiding diabetic nephropathy, and thereby improving the quality of life. Imaging remains critical in the assessment of these transplant grafts. Ultrasound with Doppler remains the primary imaging modality for establishing baseline assessment of the graft as well as for evaluating vascular, parenchymal, and perigraft complications. Noncontrast MR imaging is preferred over non-contrast CT for evaluation of parenchymal or perigraft complications in patients with decreased renal function, although contrast-enhanced CT/MR imaging may be obtained following multidisciplinary consultation in cases with high clinical and laboratory suspicion for graft dysfunction. Catheter angiography is reserved primarily for therapeutic intervention in suspected or confirmed vascular complications. An understanding of the surgical techniques and imaging appearance of a normal graft is crucial to identify potential complications and direct timely management. This article provides an overview of surgical techniques, normal imaging appearance, as well as the spectrum of imaging findings and potential complications in pancreas-kidney transplants.
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Affiliation(s)
- Ashish P Wasnik
- Department of Radiology, University of Michigan-Michigan Medicine, 1500 E. Medical Center Dr., Ann Arbor, MI 48109, United States.
| | - Anum A Aslam
- Department of Radiology, University of Michigan-Michigan Medicine, 1500 E. Medical Center Dr., Ann Arbor, MI 48109, United States.
| | - John D Millet
- Department of Radiology, University of Michigan-Michigan Medicine, 1500 E. Medical Center Dr., Ann Arbor, MI 48109, United States.
| | - Amit Pandya
- Department of Radiology, University of Michigan-Michigan Medicine, 1500 E. Medical Center Dr., Ann Arbor, MI 48109, United States.
| | - Ronald O Bude
- Department of Radiology, University of Michigan-Michigan Medicine, 1500 E. Medical Center Dr., Ann Arbor, MI 48109, United States.
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15
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Kim HS, Lee JH, Lee DY, Kim HY, Kim DH, Oh JS, Sin YH, Kim JK, Hwang SD. Allograft dysfunction and parenchymal necrosis associated with renal artery stenosis and perigraft hematoma after kidney transplantation. KOREAN JOURNAL OF TRANSPLANTATION 2020; 34:126-131. [PMID: 35769345 PMCID: PMC9187043 DOI: 10.4285/kjt.2020.34.2.126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 04/11/2020] [Accepted: 04/12/2020] [Indexed: 11/21/2022] Open
Abstract
Transplant renal artery stenosis (TRAS) is one cause of allograft dysfunction. TRAS causes parenchymal necrosis and graft insufficiency. Herein, we report the case of a 40-year-old female with end-stage renal disease due to immunoglobulin A nephropathy, who underwent kidney transplantation with her elder sister. The surgery was successful and the allograft showed primary graft function. At postoperative day (POD) 2, urine output decreased sharply. We checked a non-enhanced abdominal computed tomography scan which showed subcapsular and pelvic cavity hematomas. She underwent hematoma removal surgery with renal upper polar capsulotomy. Bleeding control was successful, but her serum creatinine was 5.4 mg/dL. At POD 25, abdomen magnetic resonance angiography showed significant stenosis at the anastomosis site between the graft renal artery and the recipient’s internal iliac artery. Then, percutaneous transluminal angioplasty was implemented. Significant stenosis (>80%) was detected at the anastomotic site and a 5-mm stent was inserted at stenotic lesion with post-stent balloon angioplasty using a 5-mm balloon catheter. The renal arterial diameter and blood flow were normalized. At postoperative 5 months, a 99mTc dimercaptosuccinic acid scan showed multiple focal radioisotope defects. At 54 months after renal transplantation, her serum creatinine level was 4.0 mg/dL and her glomerular filtration rate was 13 mL/min/1.73 m2. Hence, we report that TRAS can cause parenchymal necrosis and allograft dysfunction.
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Affiliation(s)
- Han Sae Kim
- Department of Internal Medicine, Q Hospital, Busan, Korea
| | - Jin Ho Lee
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Dong Yeol Lee
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Hee Yeoun Kim
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Dong Han Kim
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Joon Seok Oh
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Yong Hun Sin
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Joong Kyung Kim
- Department of Internal Medicine, Bongseng Memorial Hospital, Busan, Korea
| | - Seun Deuk Hwang
- Division of Nephrology and Hypertension, Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea
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16
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Elzanaty A, Mhanna M, Sabbagh E, Soni R, Ekwenna O, Moukarbel GV. Intra-Arterial Hemodynamics to Guide the Percutaneous Treatment of a Difficult-to-Engage Transplant Renal Artery Stenosis. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2020; 21:171-173. [PMID: 32565005 DOI: 10.1016/j.carrev.2020.06.009] [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: 04/19/2020] [Accepted: 06/08/2020] [Indexed: 10/24/2022]
Abstract
Transplant renal artery stenosis (TRAS) is the most frequent vascular complication after renal transplantation. TRAS is associated with resistant hypertension and allograft dysfunction, early diagnosis and either endovascular or surgical treatment is crucial to preserve graft function. Noninvasive imaging can usually detect the underlying stenosis. In this report we present a novel technique for successful angioplasty and stent deployment in a difficult-to-engage transplant-renal artery.
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Affiliation(s)
- Ahmed Elzanaty
- Internal Medicine Department, The University of Toledo, Toledo, OH, USA
| | - Mohammed Mhanna
- Internal Medicine Department, The University of Toledo, Toledo, OH, USA
| | - Ebrahim Sabbagh
- Cardiovascular Medicine Division, The University of Toledo, Toledo, OH, USA
| | - Ronak Soni
- Cardiovascular Medicine Division, The University of Toledo, Toledo, OH, USA
| | - Obi Ekwenna
- Department of Urology, The University of Toledo, Toledo, OH, USA
| | - George V Moukarbel
- Cardiovascular Medicine Division, The University of Toledo, Toledo, OH, USA.
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17
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Shampain KL, Liles AL, Chong ST. Imaging of Transplant Emergencies. Semin Roentgenol 2020; 55:115-131. [PMID: 32438975 DOI: 10.1053/j.ro.2019.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Amber L Liles
- Department of Radiology, Michigan Medicine, Ann Arbor, MI
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18
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Ortiz CC, Miyara SJ, Cagliani JA, Cho YM, Guevara S, Hayashida K, Shinozaki K, Clement D, Becker LB, Wang B, Krishnasastry KV, Teperman LW, Molmenti EP. Renal Transplant Artery Inflow Stenosis Treated with Femorofemoral Bypass. Int J Angiol 2020; 30:310-312. [PMID: 34849111 DOI: 10.1055/s-0040-1709502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
In this case report we describe a novel and successful revascularization approach in instances of allograft and distal limb ischemia after kidney transplantation. Stenosis proximal to transplant renal artery anastomoses is a complication leading to allograft dysfunction and/or loss. We present a femorofemoral bypass graft with ringed polytetrafluoroethylene (PTFE). In this occasion, revascularization was achieved by a backflow mechanism. The approach described achieved its goal of revascularizing the allograft as well as the distal extremity, with both short- and long-term successful outcomes. Benefits of this approach when compared with re-implantation or procedures directly involving the transplant renal artery include minimization of ischemic time, no need to repair the stenosis, anastomoses with vessels of greater diameter, no need to perfuse the kidney, no need to take down the renal artery anastomosis, no need to dissect the transplanted kidney, and no further lower extremity ischemia. This approach does not require any proximal temporary inflow occlusion (as seen with stent placement) or clamping of the arterial inflow to the kidney. This procedure was completed without having to infuse any preservation fluid into the kidney.
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Affiliation(s)
| | - Santiago J Miyara
- Department of Surgery, Northwell Health, Manhasset, New York.,Department of Emergency Medicine, Northwell Health, Manhasset, New York.,Elmezzi Graduate School of Molecular Medicine, Manhasset, New York
| | | | - Young Min Cho
- Department of Surgery, Northwell Health, Manhasset, New York
| | - Sara Guevara
- Department of Surgery, Northwell Health, Manhasset, New York
| | - Kei Hayashida
- Department of Emergency Medicine, Northwell Health, Manhasset, New York
| | | | - Damian Clement
- Department of Surgery, Northwell Health, Manhasset, New York
| | - Lance B Becker
- Department of Emergency Medicine, Northwell Health, Manhasset, New York.,Elmezzi Graduate School of Molecular Medicine, Manhasset, New York
| | - Bo Wang
- Department of Surgery, Northwell Health, Manhasset, New York
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19
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Wang Q, Li X, Liu Z, Xu J, Han Y, Yu T, Chen S, Tang Y, Liu Y, Li X. Diagnosis and Treatment of Renal Artery Stenosis in China in the Era of Donation After Cardiac Death. Ann Transplant 2020; 25:e918076. [PMID: 32015300 PMCID: PMC7023544 DOI: 10.12659/aot.918076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Background The aim of this study was to investigate the clinical features and treatment strategies of transplant renal artery stenosis (TRAS) with kidneys from donation after cardiac death (DCD). Material/Methods We collected the clinical data of donors and recipients of single-center DCD-induced TRAS from January 2015 to June 2017. Results All the 8 cases of TRAS were from hypertensive cerebrovascular accident DCD-originated kidneys. The mean donor age was 53.5 (45~57) years, with mean BMI 27.8 (26.4~32.3) kg/m2, atherosclerosis index 5.8 (4.9~7.0), and renal atherosclerotic plaque. Clinical features of TRAS were: refractory hypertension with elevated serum creatinine >50%, and negative urine protein and occult blood. Ultrasound of transplanted kidneys showed renal blood flow index 0.49 (0.43~0.55). Angiography confirmed the diagnosis of renal artery trunk or secondary branch stenosis. There were 2 cases of moderate stenosis and 6 cases of severe stenosis. Six patients underwent stent implantation and 2 patients underwent balloon dilatation. Seven patients had serum creatinine recovery after interventional therapy during follow-up. The transplanted kidney of 1 patient ruptured 6 h after interventional therapy and was then resected. Conclusions The incidence of TRAS with hypertensive cerebrovascular accident DCD-originated kidneys is relatively high, which is a warning to kidney transplant physicians. Digital subtraction angiography (DSA) is the most reliable diagnostic means of TRAS and can be performed concurrently with intervention therapy. If the donor has severe atherosclerosis, plaques that are visible to the unaided eye in the renal artery trunk should be removed as completely as possible.
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Affiliation(s)
- Qiang Wang
- Department of Urology, Beijing Friendship Hospital, Capital Medical University, Beijing, China (mainland)
| | - Xiaoli Li
- Department of Geriatric Cardiology, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
| | - Zhijia Liu
- Organ Transplant Institute, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
| | - Junnan Xu
- Organ Transplant Institute, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
| | - Yong Han
- Organ Transplant Institute, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
| | - Tao Yu
- Organ Transplant Institute, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
| | - Song Chen
- Department of Urology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China (mainland)
| | - Yuzhe Tang
- Department of Urology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China (mainland)
| | - Yubao Liu
- Department of Urology, Beijing Tsinghua Changgung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China (mainland)
| | - Xiang Li
- Organ Transplant Institute, The 8TH Medical Center of Chinese People's Liberation Army (PLA) General Hospital, Beijing, China (mainland)
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20
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Mannemuddhu S, Pekkucuksen N, Bush R, Johns F, Upadhyay K. Transplant renal artery stenosis in a child with BK nephropathy. Pediatr Transplant 2020; 24:e13629. [PMID: 31815337 PMCID: PMC7167878 DOI: 10.1111/petr.13629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/23/2019] [Accepted: 11/08/2019] [Indexed: 12/29/2022]
Abstract
TRAS and BK nephropathy are known complications of RT, but the association between both has not been reported. A 2-year-old girl underwent a deceased donor renal transplant from a 20-year-old donor, along with bilateral native nephrectomies. She had a DGF due to a renal artery thrombus and required thrombectomy with re-anastomosis. Heparin and aspirin were used. Immunosuppressive agents included thymoglobulin, steroid, tacrolimus, and MMF. CMV and EBV DNA PCRs were negative, but she developed BK viremia at 2 months with stable allograft function. Immunosuppression was reduced, and leflunomide was initiated. Blood pressures were well controlled on low-dose amlodipine. Five months after RT, she presented with hypertensive emergency, following a respiratory infection, and required dialysis for oliguric acute kidney injury. Allograft biopsy showed evidence of BK nephropathy. Immunosuppression was further minimized. Doppler renal US and renal artery duplex studies were both suggestive of TRAS. Angiogram showed severe proximal anastomotic TRAS (>95% occlusion). PTA with stenting was done with immediate improvement in the blood flow and reduction in the pressure gradient. BPs and renal function normalized. Ten months post-RT, she remains normotensive with stable renal function and resolution of BK viremia. Although ureteral stenosis and nephropathy are known to occur with BK infection, TRAS is an interesting association and possibly suggest the tropism of BK virus to the vascular endothelial cells. Timely recognition and management of both is important to prevent uncontrolled hypertension and allograft dysfunction.
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Affiliation(s)
- Sudha Mannemuddhu
- Division of Pediatric NephrologyDepartment of PediatricsUniversity of FloridaGainesvilleFlorida
| | - Naile Pekkucuksen
- Division of Pediatric NephrologyDepartment of PediatricsUniversity of FloridaGainesvilleFlorida
| | - Rachel Bush
- Division of Pediatric NephrologyDepartment of PediatricsUniversity of FloridaGainesvilleFlorida
| | - Felicia Johns
- Division of Pediatric NephrologyDepartment of PediatricsUniversity of FloridaGainesvilleFlorida
| | - Kiran Upadhyay
- Division of Pediatric NephrologyDepartment of PediatricsUniversity of FloridaGainesvilleFlorida
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21
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Hori S, Yoneda T, Tomizawa M, Ichikawa K, Morizawa Y, Nakai Y, Miyake M, Fujimoto K. Unexpected presentation and surgical salvage of transplant renal artery dissection caused by vascular clamping: a case report. BMC Nephrol 2020; 21:29. [PMID: 31996160 PMCID: PMC6990553 DOI: 10.1186/s12882-020-1699-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 01/20/2020] [Indexed: 11/18/2022] Open
Abstract
Background Transplant renal artery dissection is a rare and serious event that can cause allograft dysfunction and activation of the renin–mediated renovascular hypertension. Most cases are induced by percutaneous transluminal angioplasty, arteriosclerotic disease, or fibromuscular dysplasia. We observed a case of transplant renal artery dissection induced by unusual causes during kidney transplantation. Case presentation A 35-year-old woman, whose mother donated a kidney to her, underwent ABO-incompatible living kidney transplantation. The allograft had one renal artery and vein that were anastomosed to the internal iliac artery and external iliac vein, respectively. Although careful handling was performed in all procedures including vascular clamping, Doppler ultrasonography (US) immediately after reperfusion showed an increase in the systolic blood velocity and urine output was not observed. Arterial anastomotic stenosis was suspected, but upon exploration, a renal artery dissection was detected in the middle portion of the donor artery. The part of the transplant renal artery was resected, and cold reflux was started again. At the resected part of transplant renal artery, dissection was identified. After re-anastomosis, Doppler US revealed that the blood flow of the renal artery was adequate without an increase in the systolic blood velocity, and sufficient blood flow was observed throughout the allograft. Urine output was also observed as soon as blood flow returned, and serum creatinine level decreased to 0.95 mg/dL after surgery. The cause of injury might have been vascular clamping in order to drain the air and check bleeding at the anastomosis. Conclusions Our case reaffirmed that careful handling is needed in all procedures, including donor nephrectomy, cannulation for transplant perfusion, vascular clamping, and anastomosis, even without any evidence of arteriosclerosis. Kidney transplant recipients commonly have atherosclerosis and hypertension, which are risk factors for arterial dissection. Early diagnosis and intervention can lead to the prevention of allograft dysfunction. Therefore, close monitoring of allograft blood flow by Doppler US during surgery should be considered.
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Affiliation(s)
- Shunta Hori
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Tatsuo Yoneda
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Mitsuru Tomizawa
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Kazuki Ichikawa
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Yosuke Morizawa
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Yasushi Nakai
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Makito Miyake
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan
| | - Kiyohide Fujimoto
- Departments of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8522, Japan.
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22
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Schutter R, Lantinga VA, Borra RJH, Moers C. MRI for diagnosis of post-renal transplant complications: current state-of-the-art and future perspectives. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2019; 33:49-61. [PMID: 31879853 DOI: 10.1007/s10334-019-00813-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/27/2019] [Accepted: 11/30/2019] [Indexed: 02/07/2023]
Abstract
Kidney transplantation has developed into a widespread procedure to treat end stage renal failure, with transplantation results improving over the years. Postoperative complications have decreased over the past decades, but are still an important cause of morbidity and mortality. Early accurate diagnosis and treatment is the key to prevent renal allograft impairment or even graft loss. Ideally, a diagnostic tool should be able to detect post-transplant renal dysfunction, differentiate between the different causes and monitor renal function during and after therapeutic interventions. Non-invasive imaging modalities for diagnostic purposes show promising results. Magnetic resonance imaging (MRI) techniques have a number of advantages, such as the lack of ionizing radiation and the possibility to obtain relevant tissue information without contrast, reducing the risk of contrast-induced nephrotoxicity. However, most techniques still lack the specificity to distinguish different types of parenchymal diseases. Despite some promising outcomes, MRI is still barely used in the post-transplantation diagnostic process. The aim of this review is to survey the current literature on the relevance and clinical applicability of diagnostic MRI modalities for the detection of various types of complications after kidney transplantation.
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Affiliation(s)
- Rianne Schutter
- University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
| | - Veerle A Lantinga
- University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Ronald J H Borra
- University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Cyril Moers
- University Medical Center Groningen, University of Groningen, Groningen, Netherlands
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23
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Hasjim BJ, Fujitani RM, Chen SL, Donayre C, Kuo IJ, Raza A, Reddy U, Ichii H, Kabutey NK. Utilization of Carbon Dioxide Angiography and Percutaneous Balloon Angioplasty for Treatment of Transplant Renal Artery Stenosis. Ann Vasc Surg 2019; 65:10-16. [PMID: 31712187 DOI: 10.1016/j.avsg.2019.11.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 09/23/2019] [Accepted: 11/04/2019] [Indexed: 11/18/2022]
Abstract
BACKGROUND Transplant renal artery stenosis (TRAS) may lead to graft dysfunction and failure. Progressive deterioration of renal allograft function may be exacerbated by contrast-induced nephrotoxicity during iodine contrast administration for renovascular imaging of allografts. We present our institutional experience of endovascular management for TRAS using CO2 digital subtraction angiography (CO2-DSA) and balloon angioplasty to manage failing renal transplants. METHODS Four patients with renal allografts from March 2017-May 2018 were referred for graft dysfunction and pending renal transplant failure. Indications for referral included refractory hypertension, decreasing renal functioning, and elevated renovascular systolic velocities. RESULTS Median age of the four patients was 41.5 years (22-60 years). There were two male and female patients. Chronic hypertension and type 2 diabetes mellitus were the most common comorbidities. An average total of 75 mL of CO2 was used, supplemented with 17.4 mL of iodinated contrast. All patients had improvements in renal function following intervention with a mean decrease in systolic and diastolic blood pressure of 25.8% and 21.4%, respectively. We also observed a mean decrease of BUN by 13.6% and creatinine by 37.4%. Additionally, eGFR increased by 37.7%. All allografts survived after surgery, and only one patient required repeat angioplasty for recurrence. CONCLUSIONS CO2-DSA with balloon angioplasty can be successfully utilized to salvage deteriorating kidney allograft function in patients with TRAS.
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Affiliation(s)
- Bima J Hasjim
- Division of Vascular Surgery, Department of Surgery, University of California, Irvine, Orange, CA
| | - Roy M Fujitani
- Division of Vascular Surgery, Department of Surgery, University of California, Irvine, Orange, CA
| | - Samuel L Chen
- Division of Vascular Surgery and Endovascular Therapy, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - Carlos Donayre
- Division of Vascular Surgery, Department of Surgery, University of California, Irvine, Orange, CA
| | - Isabella J Kuo
- Division of Vascular Surgery, Department of Surgery, University of California, Irvine, Orange, CA
| | - Aamir Raza
- Division of Nephrology and Hypertension, Department of Medicine, University of California, Irvine, Orange, CA
| | - Uttam Reddy
- Division of Nephrology and Hypertension, Department of Medicine, University of California, Irvine, Orange, CA
| | - Hirohito Ichii
- Division of Transplant Surgery, Department of Surgery, University of California, Irvine, Orange, CA
| | - Nii-Kabu Kabutey
- Division of Vascular Surgery, Department of Surgery, University of California, Irvine, Orange, CA.
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Bull AS, Piovesan AC, Marchini GS, Yamaçake KGR, Antonopoulos IM, Falci R, Kanashiro H, Ebaid G, Carnevale FC, Messi G, Nahas WC. Outcomes of endovascular treatment of renal arterial stenosis in transplanted kidneys. Int Braz J Urol 2019; 45:925-931. [PMID: 31268637 PMCID: PMC6844355 DOI: 10.1590/s1677-5538.ibju.2018.0737] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 04/14/2019] [Indexed: 02/06/2023] Open
Abstract
Objective To evaluate the effectiveness and outcomes of endovascular treatment of TRAS with PTA. Materials and Methods We searched our prospectively collected database looking at cases of TRAS between January 2005-December 2011. CCT was the gold-standart for diagnosis of TRAS. Parameters analysed comprised technical aspects, arterial blood pressure variation, and renal function. A minimum follow-up of 24 months was considered. Results Of the 2221 renal transplants performed in the selected period, 22 (0.9%) patients were identified with TRAS. Fourteen (63.6%) were male and mean age was 377±14.8years (12-69). Kidney graft was from deceased donnors in 20 (80%) cases. On doppler evaluation, mean blood flow speed after transplantation, at TRAS diagnosis and after TAP was 210.6±99.5, 417±122.7 and 182.5±81.6mL/sec, respectively (p<0.001). For SBP and DBP, there was a significant difference between between pre-intervention and all post-treatment time points (p<0.001). After 1 month of the procedure, there was stabilization of the Cr level with a significant difference between mean Cr levels along time (p<0.001). After a mean follow-up of 16±4.2 (3-24) months, overall success rate was 100%. Conclusions Endovascular treatment with PTA/stenting is a safe and effective option for managing TRAS, ensuring the functionality of the graft and normalization of blood pressure and renal function.
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Affiliation(s)
- Alexandre Sallum Bull
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Affonso Celso Piovesan
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Giovanni Scala Marchini
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Kleiton Gabriel Ribeiro Yamaçake
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Ioannis Michel Antonopoulos
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Renato Falci
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Hideki Kanashiro
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Gustavo Ebaid
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Francisco César Carnevale
- Unidade de Radiologia Intervencionista da Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - Gustavo Messi
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
| | - William Carlos Nahas
- Divisão de Urologia, Unidade de Transplante Renal, Faculdade de Medicina da Universidade de São Paulo - USP, São Paulo, SP, Brasil
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Elmously A, Stern JR, Greenberg J, Agrusa CJ, Schneider DB, Ellozy SH, Connolly PH. Carbon Dioxide Angiography in the Treatment of Transplant Renal Artery Stenosis. Ann Vasc Surg 2019; 63:198-203. [PMID: 31626944 DOI: 10.1016/j.avsg.2019.08.085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 08/04/2019] [Accepted: 08/11/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Transplant renal artery stenosis (TRAS) is a serious complication associated with graft loss. Selective carbon dioxide angiography allows for effective diagnosis and therapy with the use of minimal to no contrast agent. This study sought to evaluate the efficacy of the adjunctive use of carbon dioxide angiography in the treatment of TRAS. METHODS Patients undergoing endovascular therapy (percutaneous transluminal angioplasty with or without stent) for TRAS between the years 2012 and 2017 at a single tertiary care academic medical center were studied. Outcomes of interest included technical success, postoperative glomerular filtration rate, and renal ultrasound hemodynamic parameters. RESULTS Of the 37 patients who underwent angiography for TRAS during the study period, 34 underwent a therapeutic intervention. Of those, 24 patients (70.6%) underwent adjunctive carbon dioxide angiography versus 10 patients (29.4%) who underwent standard contrast angiography. Baseline characteristics between the carbon dioxide angiography and traditional angiography groups were similar. Patients undergoing carbon dioxide angiography received significantly less contrast agent than patients undergoing traditional angiography [9.5 mL (IQR 2-19.5) versus 19.5 mL (IQR 15-30), P = 0.03)] and maintained equivalent technical success rates (92.2% vs. 91.7%, P = 0.9). CONCLUSIONS The adjunctive use of carbon dioxide angiography allows for significantly less contrast administration compared with standard angiography while achieving an equivalent rate of technical success. Selective carbon dioxide angiography should be considered a first-line modality for patients with TRAS in need of endovascular therapy.
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Affiliation(s)
- Adham Elmously
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY.
| | - Jordan R Stern
- Division of Vascular and Endovascular Surgery, Stanford University School of Medicine, Stanford, CA
| | - Jacques Greenberg
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY
| | - Christopher J Agrusa
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY
| | - Darren B Schneider
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY
| | - Sharif H Ellozy
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY
| | - Peter H Connolly
- Division of Vascular and Endovascular Surgery, New York Presbyterian Hospital - Weill Cornell Medicine, New York, NY
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Fan M, Ni X, Li Y, Chen J, Cheng D, Shi D, He X, Wen J. Assessment of transplant renal artery stenosis with diffusion-weighted imaging: A preliminary study. Magn Reson Imaging 2019; 60:157-163. [DOI: 10.1016/j.mri.2019.05.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 03/28/2019] [Accepted: 05/04/2019] [Indexed: 01/19/2023]
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Percutaneous transluminal angioplasty alone versus stent placement for the treatment of transplant renal artery stenosis. Diagn Interv Imaging 2019; 100:493-502. [PMID: 30952527 DOI: 10.1016/j.diii.2019.03.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 02/28/2019] [Accepted: 03/10/2019] [Indexed: 11/20/2022]
Abstract
PURPOSE The purposes of this retrospective study were to assess the efficacy of endovascular techniques for the treatment of transplant renal artery stenosis (TRAS) by analyzing technical and clinical success and to compare the results of percutaneous transluminal angioplasty (PTA) alone to those of stenting. MATERIALS AND METHODS A retrospective analysis was conducted on 31 patients who underwent endovascular treatment for TRAS between January 2012 and December 2017. There were 23 men and 8 women with a mean age of 60.5±14 (SD) years (range: 24-81 years). Ten patients (10/31; 32%; 8 men, 2 women; median age, 63 years) were treated with PTA alone and 21/31 (68%; 15 men, 6 women; median age, 65 years) with metallic stent placement. Several variables including serum creatinine level, glomerular filtration rate, arterial blood pressure value, antihypertensive medication obtained before and after treatment were compared. Technical success was assessed for each procedure. Clinical success was defined as a 15% drop in serum creatinine level, a decrease greater than 15% in mean blood pressure values or a decrease greater than 10% in mean blood pressure values with a reduction in the number of antihypertensive drugs needed for hypertension control. RESULTS Technical success was obtained in all patients [31/31; 100%; 95% confidence interval (CI): 89-100%] and clinical success in 27/31 patients (87%; 95%CI: 71-95%). Four patients (4/31; 13%; 95%CI: 5-29%) underwent repeat endovascular intervention. Mean serum creatinine level and mean arterial blood pressure values were significantly lower after treatment (177.4 and 93.8μmol/l, respectively) compared to before treatment (319.4 and 106.7μmol/l, respectively) in the stent group but not in the group treated with PTA alone (P=0.0012 and P=0.002, respectively). CONCLUSION The endovascular approach is safe and effective in the management of TRAS and stenting, depending on the morphology of the stenosis, should be the treatment of choice when possible.
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Kuczborska K, Gozdowska J, Chmura A, Durlik M. Successful Pediatric Kidney Transplantation Into an Adult Recipient: A Case Report. Transplant Proc 2018; 50:3920-3922. [PMID: 30577286 DOI: 10.1016/j.transproceed.2018.06.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Accepted: 06/19/2018] [Indexed: 11/24/2022]
Abstract
BACKGROUND The constant shortage of kidney donors prompts exploration into new strategies of transplantation. One of these strategies is the use of pediatric donors aged up to 5 years whose kidneys can be transplanted into adult recipients, mainly en bloc. This involves retrieving kidneys en bloc with aorta and inferior vena cava and anastomosing them to the recipient's external iliac vessels. CASE PRESENTATION In our hospital, kidneys from a 3-year-old child were transplanted to a 30-year-old man. The recipient with end-stage renal failure, due to glomerular nephritis, was dialyzed for 12 years and had 1 failed transplantation with consequent graftectomy. In 2009, kidneys were transplanted to the external iliac artery and vein with reconstruction of the renal vessels. Shortly after transplantation the patient had normal renal measures. Three months later a critical stenosis of 1 renal artery was detected. Angioplasty was performed but technical reasons did not allow for effective dilatation of the vessel. Further, 6 months after kidney transplantation (KTx) nephrotic proteinuria appeared and features of membranous nephropathy were detected in a renal biopsy. The proteinuria subsided after administration of ramipril and losartan. Doppler ultrasound revealed that 1 artery remained 90% stenotic with a peak systolic velocity of 377 cm/sec. Despite reported complications, renal function appeared normal over 7 years of observation. CONCLUSIONS A transplantation of 2 pediatric kidneys into an adult recipient has very high efficacy. The survival of both graft and recipient is similar to the results obtained after living donor kidney transplantation.
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Affiliation(s)
- K Kuczborska
- Department of Transplantation Medicine, Nephrology and Internal Medicine, Medical University of Warsaw, Warsaw, Poland
| | - J Gozdowska
- Department of Transplantation Medicine, Nephrology and Internal Medicine, Medical University of Warsaw, Warsaw, Poland.
| | - A Chmura
- Department of General and Transplantation Surgery, Medical University of Warsaw, Warsaw, Poland
| | - M Durlik
- Department of Transplantation Medicine, Nephrology and Internal Medicine, Medical University of Warsaw, Warsaw, Poland
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Nicholson ML, Yong C, Trotter PB, Grant L, Hosgood SA. Risk factors for transplant renal artery stenosis after live donor transplantation. Br J Surg 2018; 106:199-205. [DOI: 10.1002/bjs.10997] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 06/07/2018] [Accepted: 08/09/2018] [Indexed: 11/05/2022]
Abstract
Abstract
Background
Renal transplant surgeons are making increasing use of live donor kidneys with multiple renal arteries. This study aimed to identify independent risk factors for the development of transplant renal artery stenosis (TRAS) in the modern era of complex arterial reconstruction for multiple vessels.
Methods
Multivariable logistic regression analysis with a stepwise variable deletion model was used to identify risk factors for the development of TRAS in a consecutive series of live donor kidney transplants.
Results
Of 506 kidney transplants, 19 (3·8 per cent) had evidence of significant TRAS on CT angiography. Functional TRAS, defined by improvement in BP control or renal function after correction of a stenosis by angioplasty, occurred in 13 of 506 patients (2·6 per cent). Independent risk factors for TRAS were: use of an explanted internal iliac artery graft from the recipient (odds ratio (OR) 4·95; P = 0·020) and total ischaemia time (OR 1·82; P = 0·010). TRAS was associated with a lower 5-year allograft survival rate (79 versus 88·7 per cent; P = 0·020) but only one graft loss was attributed directly to TRAS. The 5-year allograft survival rate after internal iliac artery grafting was 86 per cent.
Conclusion
Although use of an internal iliac artery graft is an independent risk factor for TRAS after live donor kidney transplantation, this technique is still a useful option for complex arterial reconstruction.
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Affiliation(s)
- M L Nicholson
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
- Department of Surgery, University of Cambridge, Cambridge, UK
| | - C Yong
- Department of Surgery, University of Cambridge, Cambridge, UK
| | - P B Trotter
- Department of Surgery, University of Cambridge, Cambridge, UK
| | - L Grant
- Department of Surgery, University of Cambridge, Cambridge, UK
| | - S A Hosgood
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK
- Department of Surgery, University of Cambridge, Cambridge, UK
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Aziz F, Clark D, Garg N, Mandelbrot D, Djamali A. Hypertension guidelines: How do they apply to kidney transplant recipients. Transplant Rev (Orlando) 2018; 32:225-233. [DOI: 10.1016/j.trre.2018.06.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/05/2018] [Accepted: 06/17/2018] [Indexed: 12/28/2022]
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Abstract
Proper pre- and post-transplant diagnostic imaging work-up is fundamental in ensuring a successful outcome for renal transplantation. Despite exposure to ionizing radiation, CT has high spatial resolution and is a widely available and fast imaging technique. CT is performed routinely to delineate the anatomy of the kidney, relevant vasculature, and urinary collecting system in the living donor, to assess the iliac vessels in potential recipients prior to surgery, and to assess early and late-term post-transplant complications. The purpose of this article is to outline the optimal CT protocol and the main reportable findings for both the donor and the recipient diagnostic imaging work-up as well as to point out the main issues regarding ionizing radiation exposure and contrast medium injection in these subjects.
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Roustan FR, Lareyre F, Bentellis I, Haider R, Torrino S, Sedat J, Albano L, Jean-Baptiste E, Raffort J, Durand M. Endovascular Treatment of Transplant Renal Artery Stenosis: Evaluation of Postoperative Outcomes and Risk Factors for Recurrence. Angiology 2018; 70:249-256. [DOI: 10.1177/0003319718787665] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Angioplasty with or without stenting has become a well-established procedure to treat transplant renal artery stenosis (TRAS). We evaluated our experience on postoperative outcomes following the intervention and identified potential predictive factors of TRAS recurrence. Consecutive patients who underwent endovascular treatment of TRAS were retrospectively reviewed. The study end points were the technical success, 30-day postoperative complications, and the estimated glomerular filtration rate (eGFR). Thirty-two patients underwent endovascular treatment for TRAS. The technical success rate was 96.6%. Complications were observed for 7 (21.9%) patients: 4 had a dissection, 2 a pseudoaneurysm, and 1 (3.1%) patient developed an acute pulmonary edema. The mean eGFR significantly increased at 7 days, 3 months, and 6 months postintervention (43.1, 44.9, and 44.3 vs 33.9 mL/min/1.73 m2 preoperatively, P < .05). The TRAS recurrence was observed in 7 (21.9%) patients. These patients had significantly higher preoperative peak systolic velocity and systolic rise time (5 vs 4 m/s, P = .0383 and 103 vs 80 milliseconds, P = .0148, respectively). Endovascular treatment of TRAS is associated with high technical success and significant improvement in renal function. Further studies are required to confirm predictive factors of TRAS recurrence following endovascular treatment.
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Affiliation(s)
- François-René Roustan
- Department of Urology, University Hospital of Nice, Nice, France
- Université Côte d’Azur, CHU, Inserm, C3M, Nice, France
| | - Fabien Lareyre
- Université Côte d’Azur, CHU, Inserm, C3M, Nice, France
- Department of Vascular Surgery, University Hospital of Nice, Nice, France
| | - Imad Bentellis
- Department of Urology, University Hospital of Nice, Nice, France
| | - Romain Haider
- Department of Urology, University Hospital of Nice, Nice, France
| | | | - Jacques Sedat
- Department of Interventional Radiology, University Hospital of Nice, Nice, France
| | - Laetitia Albano
- Department of Nephrology, University Hospital of Nice, Nice, France
| | - Elixène Jean-Baptiste
- Université Côte d’Azur, CHU, Inserm, C3M, Nice, France
- Department of Vascular Surgery, University Hospital of Nice, Nice, France
| | - Juliette Raffort
- Université Côte d’Azur, CHU, Inserm, C3M, Nice, France
- Clinical Chemistry Laboratory, University Hospital of Nice, Nice, France
| | - Matthieu Durand
- Department of Urology, University Hospital of Nice, Nice, France
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Mueller-Peltzer K, Rübenthaler J, Fischereder M, Habicht A, Reiser M, Clevert DA. The diagnostic value of contrast-enhanced ultrasound (CEUS) as a new technique for imaging of vascular complications in renal transplants compared to standard imaging modalities. Clin Hemorheol Microcirc 2018; 67:407-413. [PMID: 28885208 DOI: 10.3233/ch-179221] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Vascular complications in renal transplant patients are a well-known issue in post transplant patient care. If malfunctioning of the renal transplant is suspected to be caused by vascular complications an early diagnosis and therapy is required to maintain the renal transplant. Computed tomography (CT), digital substraction angiography (DSA) and radioisotope renography are the gold standard imaging modalities to diagnose vascular complications. OBJECTIVE To analyse the sensitivity and specificity of contrast-enhanced ultrasound (CEUS) in comparison to the standard imaging modalities CT, DSA and radioisotope renography in the diagnosis of vascular complications in renal transplant patients. METHODS A total of 33 renal transplant recipients with elevated kidney function parameters with initial diagnostic imaging between 2006 and 2017 were included in the study. The imaging studies and clinical data were analysed retrospectively. The diagnostic accuracy of CEUS was compared to CT, DSA and renal scintigraphy respectively which are classified as gold standard for diagnosis of vascular complications in renal transplant patients. Out of 23 patients 15 patients showed vascular complications in CT, DSA or radioisotope renography and in 15 out of 15 patients CEUS detected the vascular complication. RESULTS CEUS showed a sensitivity of 100%, a specificity of 66.7%, a positive predictive value (PPV) of 71.4%, and a negative predictive value (NPV) of 100%. CONCLUSIONS CEUS is a non-nephrotoxic and safe method for the initial imaging of vascular complications in renal transplant recipients. Compared to the gold standard imaging modalities CT, DSA and radioisotope renography CEUS shows a high sensitivity and NPV in detecting vascular complications. In cases with suspected stenosis of the transplant renal artery additional DSA might be needed.
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Affiliation(s)
- K Mueller-Peltzer
- Department of Radiology, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
| | - J Rübenthaler
- Department of Radiology, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
| | - M Fischereder
- Department of Internal Medicine IV, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
| | - A Habicht
- Department of Internal Medicine IV, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
| | - M Reiser
- Department of Radiology, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
| | - D-A Clevert
- Department of Radiology, Ludwig-Maximilians-University Munich - Grosshadern Campus, Munich, Germany
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Li X, Zhang J, Meng Y, Yang L, Wang F, Li B, Zhang X. Transplant renal artery stenosis caused by the stretch of an artey branch: a case report and literature review. BMC Nephrol 2018. [PMID: 29523086 PMCID: PMC5845193 DOI: 10.1186/s12882-018-0856-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Background Renal transplant is the preferred treatment option for these patients with end-stage renal disease. Transplant renal artery stenosis (TRAS) is one of the most common and serious vascular complications after renal transplantation, and most of the TRAS occurred in the anastomosis. The complication must be diagnosed and treated timely, otherwise the function of transplanted kidney may be losed. Case presentation A 46-year-old male with end-stage renal disease of unknown cause received a cadaveric renal transplant one year ago. Although three antihypertensive medications were administrated, his blood pressure gradually increased to 190/120 mmHg 3 weeks posttransplantation. Also the level of creatinine increased to 194 μmol/L.Color Doppler ultrasonography indicated a decreased resistance index (RI) in intrarenal arteries and increased blood flow of the transplant renal artery, therefore, a vascular complication of TRAS was suspected. Arteriography was performed and demonstrated TRAS caused by stretch of an artery branch, and the TRAS occurred in the distal site of the anastomosis instead of the anastomosis. Percutaneous transluminal bare stent implantation treatment was successfully performed. Satisfactory clinical efficacy with improvement in transplant renal function and renovascular hypertension was achieved after the interventional treatment. Conclusion To our knowledge this is the first reported case of TRAS caused by stretch of an artery branch. When refractory hypertension and allograft dysfunction are presented posttransplantation, TRAS should be suspected. Color Doppler ultrasonography as a non-invasive examination may provide some valuable information, three-dimention CT can be useful for further diagnosis, but is seldom necessary. Arteriography provides the definitive diagnosis of TRAS. Percutaneous transluminal stent implantation treatment of TRAS has high success rate with minimal invasion and complications. When an artery branch situated on the stenosis, a bare stent rather than covered stent is the preferred choice.
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Affiliation(s)
- Xiaohang Li
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
| | - Jialin Zhang
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China.
| | - Yiman Meng
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
| | - Lei Yang
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
| | - Fengshan Wang
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
| | - Baifeng Li
- Department of Hepatobiliary Surgery and Organ Transplant, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
| | - Xitong Zhang
- Department of Intervention, First Affiliated Hospital, China Medical University, No.155, Nanjing North Street, Shenyang, Liaoning Province, 110001, People's Republic of China
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Gomes Júnior MPM, Alves CMR, Barbosa AHP, Caixeta A, Batista MC, Pestana JOM, Carvalho AC. Initial experience with the use of fractional flow reserve in the hemodynamic evaluation of transplant renal artery stenosis. Catheter Cardiovasc Interv 2018; 91:820-826. [DOI: 10.1002/ccd.27476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 11/07/2017] [Accepted: 11/25/2017] [Indexed: 12/29/2022]
Affiliation(s)
- Manuel Pereira Marques Gomes Júnior
- Interventional Cardiology Catheterization Laboratory Unit, Cardiology Division, Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM, São Paulo; SP Brazil
| | - Cláudia Maria Rodrigues Alves
- Interventional Cardiology Catheterization Laboratory Unit, Cardiology Division, Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM, São Paulo; SP Brazil
| | - Adriano Henrique Pereira Barbosa
- Interventional Cardiology Catheterization Laboratory Unit, Cardiology Division, Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM, São Paulo; SP Brazil
| | - Adriano Caixeta
- Interventional Cardiology Catheterization Laboratory Unit, Cardiology Division, Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM, São Paulo; SP Brazil
| | - Marcelo Costa Batista
- Departament of Nefrology; Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM; São Paulo SP Brazil
| | - José Osmar Medina Pestana
- Departament of Nefrology; Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM; São Paulo SP Brazil
| | - Antônio Carlos Carvalho
- Cardiology Division; Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP/EPM; São Paulo SP Brazil
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Screening for Transplant Renal Artery Stenosis: Ultrasound-Based Stenosis Probability Stratification. AJR Am J Roentgenol 2017; 209:1064-1073. [PMID: 28858538 DOI: 10.2214/ajr.17.17913] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The objective of our study was to evaluate which spectral Doppler ultrasound parameters are useful in patients with clinical concern for transplant renal artery stenosis (TRAS) and create mathematically derived prediction models that are based on these parameters. MATERIALS AND METHODS The study subjects included 120 patients with clinical signs of renal dysfunction who had undergone ultrasound followed by angiography (either digital subtraction angiography or MR angiography) between January 2005 and December 2015. Five ultrasound variables were evaluated: ratio of highest renal artery velocity to iliac artery velocity, highest renal artery velocity, spectral broadening, resistive indexes, and acceleration time. Angiographic studies were categorized as either showing no stenosis or showing stenosis. Reviewers assessed the ultrasound examinations for TRAS using all five variables, which we refer to as the full model, and using a reduced number of variables, which we refer to as the reduced-variable model; sensitivities and specificities were generated. RESULTS Ninety-seven patients had stenosis and 23 had no stenosis. The full model had a sensitivity and specificity of 97% and 91%, respectively. The reduced-variable model excluded the ratio and resistive index variables without affecting sensitivity and specificity. We applied cutoff values to the variables in the reduced-variable model, which we refer to as the simple model. Using these cutoff values, the simple model showed a sensitivity and specificity of 96% and 83%. The simple model was able to categorize patients into four risk categories for TRAS: low, intermediate, high, and very high risk. CONCLUSION We propose a simple model that is based on highest renal artery velocity, distal spectral broadening, and acceleration time to classify patients into risk categories for TRAS.
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Zhang X, Wang H, Liu S, Yan J, Liu X, Xu D, Tian C. Three-Dimensional Computed Tomography Reconstruction in Transplant Renal Artery Stenosis. EXP CLIN TRANSPLANT 2017; 15:615-619. [PMID: 28332957 DOI: 10.6002/ect.2016.0156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES Transplant renal artery stenosis is a frequently recognized complication of kidney transplant procedures. A single-center retrospective study was conducted to examine the use of 3-dimensional computed tomography reconstruction in diagnosing transplant artery stenosis. MATERIALS AND METHODS During 2013 at our center, 86 patients underwent kidney transplant. All patients underwent ultrasonographic analyses. Patients with clinically suspected transplant renal artery stenosis were examined by 3-dimensional computed tomography reconstruction and were treated with endovascular approaches or medically managed. RESULTS Ten patients were diagnosed with transplant renal artery stenosis by 3-dimensional computed tomography reconstruction. No evidence of contrast-induced nephrotoxicity was observed. Nine of the 10 patients underwent percutaneous transluminal angio-plasty, whereas the remaining patient was treated conservatively. Procedural success rate was 100%. Patients were followed for a mean period of 20 ± 3 months. Blood pressure improved from a mean of 163/90 to 132/73 mm Hg at the end of the follow-up period. In the 9 patients who underwent angioplasty, serum creatinine improved from 198 ± 24 to 134 ± 16 μmol/L at the end of the follow-up period. The cystatin C level in some patients declined after interventional therapy. CONCLUSIONS Three-dimensional computed tomography reconstruction is a safe choice for patients who present with increased serum creatinine levels and refractory hypertension. Percutaneous transluminal angioplasty is the preferred therapeutic technique for transplant renal artery stenosis.
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Affiliation(s)
- Xufeng Zhang
- Department of Kidney Transplantation, Second Hospital of Shandong University, Jinan 250000, China
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Pan FS, Liu M, Luo J, Tian WS, Liang JY, Xu M, Zheng YL, Xie XY. Transplant renal artery stenosis: Evaluation with contrast-enhanced ultrasound. Eur J Radiol 2017; 90:42-49. [PMID: 28583646 DOI: 10.1016/j.ejrad.2017.02.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 01/12/2017] [Accepted: 02/19/2017] [Indexed: 02/09/2023]
Abstract
OBJECTIVE To assess the efficacy of contrast-enhanced ultrasound (CEUS) in depicting transplant renal artery stenosis (TRAS). MATERIALS AND METHODS Seventy-eight patients (56 men and 22 women; aged 36±12.2years) who were suspected of TRAS due to either Doppler ultrasound (DUS) abnormalities or difficult control of blood pressure and/or persistent deterioration of renal function were enrolled to perform CEUS. The reference standard for the TRAS diagnoses was computed tomography angiography (CTA). The diagnostic performance of DUS and CEUS parameters was assessed by the area under the receiver operating characteristic curve (AUC). RESULTS TRAS was diagnosed in 32 out of 78 cases by CTA. The AUC, accuracy, sensitivity, specificity, positive predictive value, and negative predictive value of CEUS in predicting TRAS were 0.92, 92.3%, 87.5%, 95.7%, 93.3%, and 91.7%, respectively. CEUS rectified 13 (28.3%) false-positive cases on DUS, which were confirmed by CTA. Compared to DUS parameters, CEUS showed the highest AUC, statistically significant differences of AUC were found (P=0.006-0.039), except for that of the PSV ratio in the main transplant renal artery to that in interlobar artery (PSV-ratio) (AUC: 0.92 versus 0.86, P=0.422). However, CEUS showed a significantly higher specificity (95.7% versus 76.1%, P=0.008) and the same sensitivity compared to PSV-ratio. CONCLUSIONS CEUS is superior to DUS in depicting TRAS. Moreover, our results suggest that CEUS might potentially be used as a noninvasive tool to spare many patients from unnecessary CTA.
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Affiliation(s)
- Fu-Shun Pan
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Ming Liu
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Jia Luo
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Wen-Shuo Tian
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Jin-Yu Liang
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Ming Xu
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Yan-Ling Zheng
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
| | - Xiao-Yan Xie
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou 510080, PR China.
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Charnaya O, Moudgil A. Hypertension in the Pediatric Kidney Transplant Recipient. Front Pediatr 2017; 5:86. [PMID: 28507980 PMCID: PMC5410589 DOI: 10.3389/fped.2017.00086] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/01/2017] [Accepted: 04/07/2017] [Indexed: 12/14/2022] Open
Abstract
Hypertension after kidney transplant is a frequent occurrence in pediatric patients. It is a risk factor for graft loss and contributes to the significant burden of cardiovascular disease (CVD) in this population. The etiology of posttransplant hypertension is multifactorial including donor factors, recipient factors, medications, and lifestyle factors similar to those prevalent in the general population. Ambulatory blood pressure monitoring has emerged as the most reliable method for measuring hypertension in pediatric transplant recipients, and many consider it to be essential in the care of these patients. Recent technological advances including measurement of carotid intima-media thickness, pulse wave velocity, and myocardial strain using specked echocardiography and cardiac magnetic resonance imaging have improved our ability to assess CVD burden. Since hypertension remains underrecognized and inadequately treated, an early diagnosis and an appropriate control should be the focus of therapy to help improve patient and graft survival.
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Affiliation(s)
- Olga Charnaya
- Division of Pediatric Nephrology, Children's National Health System, Washington, DC, USA
| | - Asha Moudgil
- Division of Pediatric Nephrology, Children's National Health System, Washington, DC, USA
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Robinson KA, Kriegshauser JS, Dahiya N, Young SW, Czaplicki CD, Patel MD. Detection of transplant renal artery stenosis: determining normal velocities at the renal artery anastomosis. Abdom Radiol (NY) 2017; 42:254-259. [PMID: 27539123 DOI: 10.1007/s00261-016-0876-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE Renal artery anastomosis peak systolic velocity (RAA PSV) exceeding 250 cm/s and a ratio of the renal artery to the adjacent external iliac artery (RAA:EIA) exceeding 1.8 historically suggest significant transplant renal artery stenosis (TRAS). However, the range of RAA PSV in transplants without TRAS has not been established. METHODS A retrospective review of renal transplants at a single institution over 5 years was performed identifying patients without graft dysfunction, failure, or refractory hypertension. RAA PSV obtained during interval postoperative sonograms was recorded. RESULTS Of 1141 patients, 844 met the inclusion criteria. Mean RAA PSV for 377 patients evaluated within 2 days of transplant measured 195 cm/s; RAA PSV exceeded 250 cm/s in 97 patients (26%). Mean RAA PSV for 820 patients evaluated 1-month post-transplant measured 206 cm/s; RAA PSV exceeded 250 cm/s in 224 patients (27%). Mean RAA PSV for 785 patients evaluated 4-month post-transplant measured 203 cm/s; RAA PSV exceeded 250 cm/s in 201 patients (26%). Mean RAA PSV for 766 patients evaluated 1-year post-transplant measured 189 cm/s; RAA PSV exceeded 250 cm/s in 141 patients (18%). At each of the given time points, 24%-34% of normal patients had RAA-to-EIA ratios greater than 1.8. CONCLUSION Approximately, 26% of patients without TRAS have RAA PSV > 250 cm/s in the first 9 months, and 18% do at 1 year. Similar findings also occurred with regards to the RAA-to-EIA ratio threshold of 1.8. In isolation, a PSV over 250 cm/s or 1.8 ratio threshold for suspicion of TRAS will lead to a large number of false-positive assessments.
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Affiliation(s)
- Kristin A Robinson
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA.
| | - J Scott Kriegshauser
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA
| | - Nirvikar Dahiya
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA
| | - Scott W Young
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA
| | - Christopher D Czaplicki
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA
| | - Maitray D Patel
- Department of Diagnostic Radiology, Mayo Clinic Hospital, 5777 East Mayo Blvd, Phoenix, AZ, 85054, USA
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Wang L, Liu B, Yan J, Wang Y, Wang W, Wang W, Chang H, Wang H, Wang C, Li Z, Li Y. Interventional Therapy for Transplant Renal Artery Stenosis Is Safe and Effective in Preserving Allograft Function and Improving Hypertension. Vasc Endovascular Surg 2016; 51:4-11. [PMID: 28100159 DOI: 10.1177/1538574416682157] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Purpose: To evaluate the outcomes of percutaneous intervention (PI) for transplant renal artery stenosis (TRAS). Materials and Methods: Doppler ultrasonography was used as the screening tool, and angiography was the diagnostic method for TRAS. The indications for PI were (1) a reduction in lumen diameter of >50% or (2) a mean pressure gradient of >15 mm Hg. Technical success was assessed immediately after the procedure. The short-term results of stenosis were evaluated by serum creatinine (Scr) levels and blood pressure (BP). The long-term results were assessed by graft survival and renal function. Results: From October 2009 to July 2015, a total of 660 patients had kidney transplantation and 22 cases underwent PI. The technical success was 100%. The mean Scr level preintervention was 321.6 ± 167.2 (range, 171.3-862.0) μmol/L, and it decreased to 145.3 ± 44.7 (range, 74.3-260.8) μmol/L 1 month postintervention ( P < .001). Blood pressure was also improved at 1 month postintervention, as assessed by systolic (157.0 ± 13.0 vs 131.0 ± 11.0 mm Hg, P < .001), diastolic (95.0 ± 5.0 vs 77.0 ± 9.0 mm Hg, P < .001), and mean arterial pressure (116.0 ± 7.0 vs 95.0 ± 9.0 mm Hg, P < .001). The patency rate was 100%, 91.7%, and 85.7% at 1, 3, and 12 months, respectively. The secondary patency rate was 100%. Graft survival was 100% during follow-up. There was no significant deterioration in graft function or BP ( P > .05) postintervention when compared to posttransplantation. Conclusions: Percutaneous intervention for TRAS is safe and results in significant improvement both in allograft function and in BP.
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Affiliation(s)
- Lili Wang
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Bin Liu
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Jieke Yan
- Department of Kidney Transplantation, the Second Hospital of Shandong University, Jinan, China
| | - Yongzheng Wang
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Wujie Wang
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Wei Wang
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Haiyang Chang
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Hongwei Wang
- Department of Kidney Transplantation, the Second Hospital of Shandong University, Jinan, China
| | - Changjun Wang
- Department of Radiology, The Jiyang People’s Hospital, Jinan, Shandong, China
| | - Zheng Li
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
| | - Yuliang Li
- Department of Interventional Medicine, the Second Hospital of Shandong University, Jinan, China
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Artery Stenosis of the Renal Graft: Experience of a Center of Northeastern Brazil. Transplant Proc 2016; 48:74-80. [PMID: 26915846 DOI: 10.1016/j.transproceed.2015.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Accepted: 11/17/2015] [Indexed: 12/21/2022]
Abstract
BACKGROUND Transplant renal artery stenosis (TRAS), the most common vascular complication after transplant (Tx), leads to resistant hypertension, impaired renal function, and even loss of the graft. The purpose of the study was to investigate the prevalence and factors associated with TRAS in northeastern Brazil. METHODS The study was conducted as a retrospective case-control study in a population of Tx recipients in a renal Tx center in northeastern Brazil. Demographic and clinical characteristics of the recipients and donors, data related to the surgery, laboratory data, and number of anti-hypertensive drugs were assessed. Statistical analysis was performed with the use of SPSS 17.0. RESULTS A total of 494 of 529 recipients were assessed, of which 24 had TRAS. The prevalence of TRAS was 4.8%. Twelve patients (50%) were men with a mean age of 46.7 ± 13.5 years. The mean time of diagnosis was 89.9 days after Tx. The risk factors associated with TRAS were number of anti-hypertensive drugs ≥2 (odds ratio, 17.0; confidence interval, 4.1 to 70.4; P = .001) and grafting with 2 or more arteries (odds ratio, 8.9; confidence interval, 1.4 to 56.6; P = .021). There was a significant reduction in mean systolic blood pressure (147.1 ± 23.7 to 127.8 ± 15.2 mm Hg, P = .001) and diastolic blood pressure (86.6 ± 13.0 to 77.6 ± 9.4 mm Hg, P = .001) after TRAS repair and in serum creatinine (2.8 ± 2.4 to 1.9 ± 1.8 mg/dL, P = .04). CONCLUSIONS Grafts with 2 or more arteries are associated with TRAS, as well as patients who use a higher number of anti-hypertensive drugs. TRAS repair was associated with improved blood pressure control and renal function.
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Long B, Koyfman A. The emergency medicine approach to transplant complications. Am J Emerg Med 2016; 34:2200-2208. [DOI: 10.1016/j.ajem.2016.08.049] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 08/18/2016] [Accepted: 08/20/2016] [Indexed: 02/07/2023] Open
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Patil AB, Ramesh D, Desai SC, Mylarappa P, Guttikonda SH, Puvvada S. Transplant renal artery stenosis: The impact of endovascular management and their outcomes. Indian J Urol 2016; 32:288-292. [PMID: 27843211 PMCID: PMC5054659 DOI: 10.4103/0970-1591.189707] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Introduction: Transplant renal artery stenosis (TRAS) is a well-known vascular complication of renal transplantation. The aim of this analysis was to assess the short and midterm outcomes of endovascular therapy to salvage transplant kidney. Methods: We retrospectively analyzed our transplant database from 2000 to 2015. Percutaneous transluminal angioplasty/stenting was done in 24 patients (22 men and two women) with significant TRAS. The mean age was 59 ± 12 years. The parameters analyzed were: Technical success, pre- and post-treatment serum creatinine and number of antihypertensive drugs before and after treatment and vessel patency on Doppler ultrasonography at 3 and 6 months. Results: Overall incidence of TRAS in this study was 5.06%. Incidence of TRAS following live donor transplantation was 4.68% while that in deceased donors was 11.5%. Technical success was 100%. There were no periprocedural deaths. Renal function was improved from 2.32 ± 0.5 mg/dL to 1.72 ± 0.3 mg/dL (P < 0.001) and number of antihypertensive medications after the procedure was reduced from 2.9 ± 0.7 to 2 ± 0.6 (P < 0.001) at 6 months follow-up. One patient developed restenosis within 5 months (4.2%). Clinical success at 6 months follow-up was 79.2%. Conclusions: Endovascular treatment of TRAS has high technical success with minimal complications. It also provides satisfactory clinical success with improvement in overall transplant renal function and renovascular hypertension in early follow-up.
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Affiliation(s)
| | - D Ramesh
- Department of Urology, M.S. Ramaiah Hospital, Bengaluru, Karnataka, India
| | - Sanjay C Desai
- Department of Vascular and Endovascular Surgery, M.S. Ramaiah Hospital, Bengaluru, Karnataka, India
| | - Prasad Mylarappa
- Department of Urology, M.S. Ramaiah Hospital, Bengaluru, Karnataka, India
| | - Sri Harsha Guttikonda
- Department of Vascular and Endovascular Surgery, M.S. Ramaiah Hospital, Bengaluru, Karnataka, India
| | - Sandeep Puvvada
- Department of Urology, M.S. Ramaiah Hospital, Bengaluru, Karnataka, India
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Moreno CC, Mittal PK, Ghonge NP, Bhargava P, Heller MT. Imaging Complications of Renal Transplantation. Radiol Clin North Am 2015; 54:235-49. [PMID: 26896222 DOI: 10.1016/j.rcl.2015.09.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Renal transplant complications are categorized as those related to the transplant vasculature, collecting system, perinephric space, renal parenchyma, and miscellaneous complications including posttransplant lymphoproliferative disorder. Many of these renal transplant complications are diagnosed with imaging. Medical complications including rejection, acute tubular necrosis, and drug toxicity also can impair renal function. These medical complications are typically indistinguishable at imaging, and biopsy may be performed to establish a diagnosis. Normal transplant anatomy, imaging techniques, and the appearances of renal transplant complications at ultrasound, computed tomography, and MR imaging are reviewed.
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Affiliation(s)
- Courtney Coursey Moreno
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1364 Clifton Road, NE, Atlanta, GA 30322, USA.
| | - Pardeep K Mittal
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1364 Clifton Road, NE, Atlanta, GA 30322, USA
| | - Nitin P Ghonge
- Department of Radiology, Indraprastha Apollo Hospitals, Delhi-Mathura Road, New Delhi 110076, India
| | - Puneet Bhargava
- Department of Radiology, VA Puget Sound Health Care System, University of Washington Medical Center, 1959 NE Pacific Street, Room BB308, Box 357115, Seattle, WA 98195-7115, USA
| | - Matthew T Heller
- Department of Radiology, University of Pittsburgh School of Medicine, 200 Lothrop Street, Suite 174E PUH, Pittsburgh, PA 15213, USA
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Bent C, Fananapazir G, Tse G, Corwin MT, Vu C, Santhanakrishnan C, Perez RV, Troppmann C. Graft arterial stenosis in kidney en bloc grafts from very small pediatric donors: incidence, timing, and role of ultrasound in screening. Am J Transplant 2015; 15:2940-6. [PMID: 26153092 DOI: 10.1111/ajt.13365] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 03/29/2015] [Accepted: 04/25/2015] [Indexed: 01/25/2023]
Abstract
In previous studies with different donor selection criteria and noncontemporary surgical techniques, graft arterial stenosis (GAS) has been reported to occur more frequently in adult recipients of pediatric en bloc renal allografts (EBKT) as compared to single adult donor allografts. The purpose of our study was to evaluate the incidence of GAS within our EBKT recipient population and to evaluate clinical and imaging features of those cases with GAS. In a retrospective cohort study, we analyzed 182 EBKT performed at a single institution. We identified cases of suspected GAS based on clinical factors, lab results, and noninvasive imaging. Diagnosis of GAS was confirmed by digital subtraction angiography. Two EBKT recipients (1.1% of 182) had angiographically confirmed GAS at 2.5 and 4.5 months after transplant. In both cases, the stenoses were short segment within the proximal (perianastomotic) donor aorta, color Doppler ultrasound demonstrated peak systolic velocities of >400 cm/s, and poststenotic parvus tardus waveforms were present. Both patients underwent angioplasty and demonstrated postintervention improvement in renal function and blood pressure. Restenosis did not occur during follow up. In conclusion, recipients of EBKT have a low incidence of GAS, similar to the lowest reported for adult single allografts.
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Affiliation(s)
- C Bent
- Department of Radiology, University of California, Davis, Sacramento, CA
| | - G Fananapazir
- Department of Radiology, University of California, Davis, Sacramento, CA
| | - G Tse
- Department of Radiology, University of California, Davis, Sacramento, CA
| | - M T Corwin
- Department of Radiology, University of California, Davis, Sacramento, CA
| | - C Vu
- Department of Radiology, University of California, Davis, Sacramento, CA
| | | | - R V Perez
- Department of Surgery, University of California, Davis, Sacramento, CA
| | - C Troppmann
- Department of Surgery, University of California, Davis, Sacramento, CA
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Kim HY, Yun JH, Kim DH, Lee JH, Oh JS, Kim SM, Sin YH, Kim JK, Kim YJ. Treatment of Renal Transplant Recipients with Concurrent Acute Cellular Rejection and Transplant Renal Artery Stenosis. KOREAN JOURNAL OF TRANSPLANTATION 2015. [DOI: 10.4285/jkstn.2015.29.3.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Hee Yeoun Kim
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Jeong Hee Yun
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Dong Han Kim
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Jin Ho Lee
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Joon Seok Oh
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Seong Min Kim
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Yong Hun Sin
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Joong Kyung Kim
- Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, Korea
| | - Yong Jin Kim
- Department of Pathology, Yeungnam University College of Medicine, Daegu, Korea
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Liu XL, Zu QQ, Wang B, Zhou CG, Zhao LB, Xia JG, Gu M, Shi HB, Liu S. Minimally invasive salvage therapy for transplanted renal allografts. Ren Fail 2015; 37:1470-5. [PMID: 26335729 DOI: 10.3109/0886022x.2015.1074492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
PURPOSE To evaluate the effectiveness of interventional therapy for complications of transplanted renal allografts. MATERIALS AND METHODS Between January 2009 and March 2014, 14 patients underwent interventional therapy for complications of renal allografts. Complications included transplant renal artery stenosis (TRAS), TRAS combined with pseudoaneurysms, transplant renal venous kinking and ureteral obstruction (UO). Serum creatinine (S.Cr) levels were evaluated before and after procedure. The characteristics and procedure outcomes of these patients with vascular and nonvascular complications were also analyzed. RESULTS All primary procedures were successfully performed, which included percutaneous transluminal angioplasty (PTA) for TRAS (n = 4), stenting and coil embolization for TRAS combined with pseudoaneurysms (n = 1), stenting for renal vein kinking (n = 2), and percutaneous nephrostomy (PCN) for UO (n = 7) and secondary antegrade stent placement in six UO patients after 1 week of PCN. No major procedure related complications occurred. S.Cr level subsequently improved from 6.0 ± 3.6 to 2.6 ± 2.1 mg/dL (p < 0.001), as well as patients' clinical features within 1 week after procedure. In our study, the onset time of vascular complications was earlier (<6 months) than nonvascular complications with significant difference (p < 0.001). During follow-up, the patient with TRAS and pseudoaneurysms suffered acute rejection 1 month after treatment and received transplant renal artery embolization. One patient with TRAS showed restenosis 4 months after procedure, and was retreated successfully with stenting. Thirteen cases reserved their transplanted renal allografts. CONCLUSION Interventional therapy could be prior considered for transplanted renal allograft complications as its effectiveness and minimal invasiveness in saving the transplanted renal grafts.
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Affiliation(s)
- Xing-Long Liu
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Qing-Quan Zu
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Bin Wang
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Chun-Gao Zhou
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Lin-Bo Zhao
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Jin-Guo Xia
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Min Gu
- b Urology Surgery , The First Affiliated Hospital of Nanjing Medical University , Nanjing , P.R. China
| | - Hai-Bin Shi
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
| | - Sheng Liu
- a Radiology Department , The First Afflicted Hospital of Nanjing Medical University , Nanjing , P.R. China and
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Zeisbrich M, Kihm LP, Drüschler F, Zeier M, Schwenger V. When is contrast-enhanced sonography preferable over conventional ultrasound combined with Doppler imaging in renal transplantation? Clin Kidney J 2015; 8:606-14. [PMID: 26413289 PMCID: PMC4581388 DOI: 10.1093/ckj/sfv070] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 07/10/2015] [Indexed: 12/18/2022] Open
Abstract
Conventional ultrasound in combination with colour Doppler imaging is still the standard diagnostic procedure for patients after renal transplantation. However, while conventional ultrasound in combination with Doppler imaging can diagnose renal artery stenosis and vein thrombosis, it is not possible to display subtle microvascular tissue perfusion, which is crucial for the evaluation of acute and chronic allograft dysfunctions. In contrast, real-time contrast-enhanced sonography (CES) uses gas-filled microbubbles not only to visualize but also to quantify renal blood flow and perfusion even in the small renal arterioles and capillaries. It is an easy to perform and non-invasive imaging technique that augments diagnostic capabilities in patients after renal transplantation. Specifically in the postoperative setting, CES has been shown to be superior to conventional ultrasound in combination with Doppler imaging in uncovering even subtle microvascular disturbances in the allograft perfusion. In addition, quantitative perfusion parameters derived from CES show predictive capability regarding long-term kidney function.
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Affiliation(s)
- Markus Zeisbrich
- Department of Nephrology , University Hospital , Heidelberg , Germany
| | - Lars P Kihm
- Department of Nephrology , University Hospital , Heidelberg , Germany
| | - Felix Drüschler
- Department of Nephrology , University Hospital , Heidelberg , Germany
| | - Martin Zeier
- Department of Nephrology , University Hospital , Heidelberg , Germany
| | - Vedat Schwenger
- Department of Nephrology , University Hospital , Heidelberg , Germany
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