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The Role of Arterial Spin Labeling Functional MRI in Assessing Perfusion Impairment of Renal Allografts: A Systematic
Jayksh Chhabra1, Guruprasad Vasant Karwarker1, Medha Rajamanuri1
1Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA.
Abstract:
Arterial spin labeling (ASL) is a functional magnetic resonance imaging (fMRI) technique that uses water in arterial blood as a tracer to map an area of interest where the intravascular and extravascular compartments exchange. Our review article focuses primarily on the role of ASL fMRI in assessing perfusion impairment in renal allografts in order to take appropriate steps to eliminate the cause of perfusion impairment at an early stage, thereby extending graft life. The study also highlights various other fMRI techniques that are used to analyze other parameters that affect kidney transplants both acutely and chronically. We gathered our data in accordance with the 2020 Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, and our search strategy included exclusion/inclusion criteria. Several databases were used in the search strategy, including PubMed, Cochrane, and Science Direct, and the Medical Subject Headings (MeSH) strategy was specifically used for PubMed, and two people scrutinized those papers to conclude that a total of 10 research papers are included in our study. This review article includes papers involving 20 to 98 subjects who had renal allografts within the previous six months and had renal cortical perfusion values measured by ASL fMRI ranging from 35 to 304 ml/100 g/min. Furthermore, when compared to healthy kidney transplant patients, renal ASL perfusion values were significantly lower in subjects with the functional imbalance of kidney transplants. It had a positive correlation with the estimated glomerular filtration rate (eGFR). To summarize, ASL fMRI is critical in detecting renal allograft perfusion impairment.
Insights
Arterial spin labeling functional MRI (ASL fMRI) effectively detects reduced blood flow in kidney transplants. Early detection of this perfusion impairment can help extend the life of the transplanted organ.
Area of Science:
- Medical Imaging
- Nephrology
- Transplant Surgery
Background:
- Arterial spin labeling (ASL) is a functional MRI (fMRI) technique utilizing arterial blood water as a tracer.
- It maps perfusion by assessing exchange between intravascular and extravascular compartments.
- Assessing renal allograft perfusion is crucial for early intervention and graft longevity.
Purpose of the Study:
- To review the role of ASL fMRI in evaluating perfusion impairment in renal allografts.
- To highlight other fMRI techniques for analyzing kidney transplant parameters.
- To provide evidence for early detection and management of perfusion issues.
Main Methods:
- Systematic review adhering to PRISMA 2020 guidelines.
- Searched PubMed, Cochrane, and Science Direct using MeSH terms.
- Included 10 research papers with 20-98 subjects each, focusing on renal allografts within six months post-transplant.
Main Results:
- ASL fMRI measured renal cortical perfusion values ranging from 35 to 304 ml/100 g/min.
- Significantly lower ASL perfusion values were observed in kidney transplant recipients with functional imbalance compared to healthy controls.
- A positive correlation was found between ASL perfusion values and estimated glomerular filtration rate (eGFR).
Conclusions:
- ASL fMRI is a critical tool for detecting perfusion impairment in renal allografts.
- Early identification of reduced perfusion allows for timely intervention to prevent graft dysfunction.
- This technique aids in extending the functional life of kidney transplants.
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