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Selby NM, Francis ST. Assessment of Acute Kidney Injury using MRI. J Magn Reson Imaging 2024. [PMID: 38334370 DOI: 10.1002/jmri.29281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/19/2024] [Accepted: 01/23/2024] [Indexed: 02/10/2024] Open
Abstract
There has been growing interest in using quantitative magnetic resonance imaging (MRI) to describe and understand the pathophysiology of acute kidney injury (AKI). The ability to assess kidney blood flow, perfusion, oxygenation, and changes in tissue microstructure at repeated timepoints is hugely appealing, as this offers new possibilities to describe nature and severity of AKI, track the time-course to recovery or progression to chronic kidney disease (CKD), and may ultimately provide a method to noninvasively assess response to new therapies. This could have significant clinical implications considering that AKI is common (affecting more than 13 million people globally every year), harmful (associated with short and long-term morbidity and mortality), and currently lacks specific treatments. However, this is also a challenging area to study. After the kidney has been affected by an initial insult that leads to AKI, complex coexisting processes ensue, which may recover or can progress to CKD. There are various preclinical models of AKI (from which most of our current understanding derives), and these differ from each other but more importantly from clinical AKI. These aspects are fundamental to interpreting the results of the different AKI studies in which renal MRI has been used, which encompass different settings of AKI and a variety of MRI measures acquired at different timepoints. This review aims to provide a comprehensive description and interpretation of current studies (both preclinical and clinical) in which MRI has been used to assess AKI, and discuss future directions in the field. LEVEL OF EVIDENCE: 1 TECHNICAL EFFICACY: Stage 3.
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Affiliation(s)
- Nicholas M Selby
- Centre for Kidney Research and Innovation, Academic Unit for Translational Medical Sciences, School of Medicine, University of Nottingham, Nottingham, UK
- Department of Renal Medicine, University Hospitals of Derby and Burton NHS Foundation Trust, Derby, UK
| | - Susan T Francis
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and The University of Nottingham, Nottingham, UK
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Wang B, Wang Y, Wang J, Jin C, Zhou R, Guo J, Zhang H, Wang M. Multiparametric Magnetic Resonance Investigations on Acute and Long-Term Kidney Injury. J Magn Reson Imaging 2024; 59:43-57. [PMID: 37246343 DOI: 10.1002/jmri.28784] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 04/29/2023] [Accepted: 05/01/2023] [Indexed: 05/30/2023] Open
Abstract
Acute kidney injury (AKI) is a frequent complication of critical illness and carries a significant risk of short- and long-term mortality. The prediction of the progression of AKI to long-term injury has been difficult for renal disease treatment. Radiologists are keen for the early detection of transition from AKI to long-term kidney injury, which would help in the preventive measures. The lack of established methods for early detection of long-term kidney injury underscores the pressing needs of advanced imaging technology that reveals microscopic tissue alterations during the progression of AKI. Fueled by recent advances in data acquisition and post-processing methods of magnetic resonance imaging (MRI), multiparametric MRI is showing great potential as a diagnostic tool for many kidney diseases. Multiparametric MRI studies offer a precious opportunity for real-time noninvasive monitoring of pathological development and progression of AKI to long-term injury. It provides insight into renal vasculature and function (arterial spin labeling, intravoxel incoherent motion), tissue oxygenation (blood oxygen level-dependent), tissue injury and fibrosis (diffusion tensor imaging, diffusion kurtosis imaging, T1 and T2 mapping, quantitative susceptibility mapping). The multiparametric MRI approach is highly promising but the longitudinal investigation on the transition of AKI to irreversible long-term impairment is largely ignored. Further optimization and implementation of renal MR methods in clinical practice will enhance our comprehension of not only AKI but chronic kidney diseases. Novel imaging biomarkers for microscopic renal tissue alterations could be discovered and benefit the preventative interventions. This review explores recent MRI applications on acute and long-term kidney injury while addressing lingering challenges, with emphasis on the potential value of the development of multiparametric MRI for renal imaging on clinical systems. EVIDENCE LEVEL: 1 TECHNICAL EFFICACY: Stage 2.
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Affiliation(s)
- Bin Wang
- Department of Medical Imaging, First Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
- Department of Medical Imaging, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Yongfang Wang
- Department of Medical Imaging, First Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jing Wang
- Department of Nuclear Medicine and PET Center, The Second Hospital of Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, China
| | - Chentao Jin
- Department of Nuclear Medicine and PET Center, The Second Hospital of Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, China
| | - Rui Zhou
- Department of Nuclear Medicine and PET Center, The Second Hospital of Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, China
| | - Jinxia Guo
- GE Healthcare, MR Research China, Beijing, China
| | - Hong Zhang
- Department of Nuclear Medicine and PET Center, The Second Hospital of Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, China
- Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
- College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou, China
| | - Min Wang
- Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China
- College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou, China
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Greite R, Schott S, Wang L, Gohlke L, Kreimann K, Derlin K, Gutberlet M, Schmidbauer M, Leffler A, Tudorache I, Salman J, Ius F, Natanov R, Fegbeutel C, Haverich A, Lichtinghagen R, Hüsing AM, von Vietinghoff S, Schmitt R, Shushakova N, Rong S, Haller H, Schmidt‐Ott KM, Gram M, Vijayan V, Scheffner I, Gwinner W, Immenschuh S. Free heme and hemopexin in acute kidney injury after cardiopulmonary bypass and transient renal ischemia. Clin Transl Sci 2023; 16:2729-2743. [PMID: 37899696 PMCID: PMC10719480 DOI: 10.1111/cts.13667] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/13/2023] [Accepted: 10/09/2023] [Indexed: 10/31/2023] Open
Abstract
Free heme is released from hemoproteins during hemolysis or ischemia reperfusion injury and can be pro-inflammatory. Most studies on nephrotoxicity of hemolysis-derived proteins focus on free hemoglobin (fHb) with heme as a prosthetic group. Measurement of heme in its free, non-protein bound, form is challenging and not commonly used in clinical routine diagnostics. In contrast to fHb, the role of free heme in acute kidney injury (AKI) after cardiopulmonary bypass (CPB) surgery is unknown. Using an apo-horseradish peroxidase-based assay, we identified free heme during CPB surgery as predictor of AKI in patients undergoing cardiac valve replacement (n = 37). Free heme levels during CPB surgery correlated with depletion of hemopexin (Hx), a heme scavenger-protein. In mice, the impact of high levels of circulating free heme on the development of AKI following transient renal ischemia and the therapeutic potential of Hx were investigated. C57BL/6 mice were subjected to bilateral renal ischemia/reperfusion injury for 15 min which did not cause AKI. However, additional administration of free heme in this model promoted overt AKI with reduced renal function, increased renal inflammation, and reduced renal perfusion on functional magnetic resonance imaging. Hx treatment attenuated AKI. Free heme administration to sham operated control mice did not cause AKI. In conclusion, free heme is a predictor of AKI in CPB surgery patients and promotes AKI in transient renal ischemia. Depletion of Hx in CPB surgery patients and attenuation of AKI by Hx in the in vivo model encourage further research on Hx therapy in patients with increased free heme levels during CPB surgery.
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Affiliation(s)
- Robert Greite
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Sebastian Schott
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Li Wang
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Lukas Gohlke
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Kirill Kreimann
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Katja Derlin
- Institute for Diagnostic and Interventional RadiologyHannover Medical SchoolHannoverGermany
| | - Marcel Gutberlet
- Institute for Diagnostic and Interventional RadiologyHannover Medical SchoolHannoverGermany
| | - Martina Schmidbauer
- Institute for Diagnostic and Interventional RadiologyHannover Medical SchoolHannoverGermany
| | - Andreas Leffler
- Department of Anesthesiology and Intensive Care MedicineHannover Medical SchoolHannoverGermany
| | - Igor Tudorache
- Department of Cardiac SurgeryUniversity Hospital DusseldorfDusseldorfGermany
| | - Jawad Salman
- Department of Cardiothoracic, Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany
| | - Fabio Ius
- Department of Cardiothoracic, Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany
| | - Ruslan Natanov
- Department of Cardiothoracic, Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany
| | - Christine Fegbeutel
- Department of Cardiothoracic, Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany
| | - Axel Haverich
- Department of Cardiothoracic, Transplantation and Vascular SurgeryHannover Medical SchoolHannoverGermany
| | | | - Anne M. Hüsing
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Sibylle von Vietinghoff
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
- Nephrology Section, Medical Clinic 1University Hospital BonnBonnGermany
| | - Roland Schmitt
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Nelli Shushakova
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Song Rong
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Hermann Haller
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Kai M. Schmidt‐Ott
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Magnus Gram
- Pediatrics, Department of Clinical Sciences LundSkane University Hospital, Lund UniversityLundSweden
| | - Vijith Vijayan
- Institute for Transfusion Medicine and Transplant EngineeringHannover Medical SchoolHannoverGermany
- Division of Critical Care Medicine, Department of PediatricsStanford University School of MedicineStanfordCaliforniaUSA
| | - Irina Scheffner
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Wilfried Gwinner
- Department of Nephrology and HypertensionHannover Medical SchoolHannoverGermany
| | - Stephan Immenschuh
- Institute for Transfusion Medicine and Transplant EngineeringHannover Medical SchoolHannoverGermany
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Francis ST, Selby NM, Taal MW. Magnetic Resonance Imaging to Evaluate Kidney Structure, Function, and Pathology: Moving Toward Clinical Application. Am J Kidney Dis 2023; 82:491-504. [PMID: 37187282 DOI: 10.1053/j.ajkd.2023.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 02/20/2023] [Indexed: 05/17/2023]
Abstract
Recent advances in multiparametric magnetic resonance imaging (MRI) allow multiple quantitative measures to assess kidney morphology, tissue microstructure, oxygenation, kidney blood flow, and perfusion to be collected in a single scan session. Animal and clinical studies have investigated the relationship between the different MRI measures and biological processes, although their interpretation can be complex due to variations in study design and generally small participant numbers. However, emerging themes include the apparent diffusion coefficient derived from diffusion-weighted imaging, T1 and T2 mapping parameters, and cortical perfusion being consistently associated with kidney damage and predicting kidney function decline. Blood oxygen level-dependent (BOLD) MRI has shown inconsistent associations with kidney damage markers but has been predictive of kidney function decline in several studies. Therefore, multiparametric MRI of the kidneys has the potential to address the limitations of existing diagnostic methods to provide a noninvasive, noncontrast, and radiation-free method to assess whole kidney structure and function. Barriers to be overcome to facilitate widespread clinical application include improved understanding of biological factors that impact MRI measures, development of a larger evidence base for clinical utility, standardization of MRI protocols, automation of data analysis, determining optimal combination of MRI measures, and health economic evaluation.
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Affiliation(s)
- Susan T Francis
- Sir Peter Mansfield Imaging Centre, School of Physics & Astronomy, University of Nottingham, Nottingham; NIHR Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, University of Nottingham, Nottingham
| | - Nicholas M Selby
- Centre for Kidney Research and Innovation, Academic Unit for Translational Medical Sciences, School of Medicine, University of Nottingham, Nottingham; Department of Renal Medicine, University Hospitals of Derby and Burton NHS Foundation Trust, Derby, United Kingdom
| | - Maarten W Taal
- Centre for Kidney Research and Innovation, Academic Unit for Translational Medical Sciences, School of Medicine, University of Nottingham, Nottingham; Department of Renal Medicine, University Hospitals of Derby and Burton NHS Foundation Trust, Derby, United Kingdom.
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Pacheco MP, Carneiro-D'Albuquerque LA, Mazo DF. Current aspects of renal dysfunction after liver transplantation. World J Hepatol 2022; 14:45-61. [PMID: 35126839 PMCID: PMC8790396 DOI: 10.4254/wjh.v14.i1.45] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 10/24/2021] [Accepted: 01/06/2022] [Indexed: 02/06/2023] Open
Abstract
The development of chronic kidney disease (CKD) after liver transplantation (LT) exerts a severe effect on the survival of patients. The widespread adoption of the model for end-stage liver disease score strongly impacted CKD incidence after the procedure, as several patients are transplanted with previously deteriorated renal function. Due to its multifactorial nature, encompassing pre-transplantation conditions, perioperative events, and nephrotoxic immunosuppressor therapies, the accurate identification of patients under risk of renal disease, and the implementation of preventive approaches, are extremely important. Methods for the evaluation of renal function in this setting range from formulas that estimate the glomerular filtration rate, to non-invasive markers, although no option has yet proved efficient in early detection of kidney injury. Considering the nephrotoxicity of calcineurin inhibitors (CNI) as a factor of utmost importance after LT, early nephroprotective strategies are highly recommended. They are based mainly on delaying the application of CNI during the immediate postoperative-period, reducing their dosage, and associating them with other less nephrotoxic drugs, such as mycophenolate mofetil and everolimus. This review provides a critical assessment of the causes of renal dysfunction after LT, the methods of its evaluation, and the interventions aimed at preserving renal function early and belatedly after LT.
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Affiliation(s)
- Mariana P Pacheco
- Division of Clinical Gastroenterology and Hepatology, Department of Gastroenterology, University of São Paulo School of Medicine, Sao Paulo 05403-900, Sao Paulo, Brazil
| | - Luiz Augusto Carneiro-D'Albuquerque
- Division of Digestive Organs Transplant, Department of Gastroenterology, University of São Paulo School of Medicine, Sao Paulo 05403-900, Sao Paulo, Brazil
| | - Daniel F Mazo
- Division of Clinical Gastroenterology and Hepatology, Department of Gastroenterology, University of São Paulo School of Medicine, Sao Paulo 05403-900, Sao Paulo, Brazil
- Division of Gastroenterology, Department of Internal Medicine, School of Medical Sciences of University of Campinas, Campinas 13083-878, Sao Paulo, Brazil
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