scholarly journals Renal Artery Stenosis, Diagnosis and Management: a Literature Review

2021 ◽  
Vol 11 (3) ◽  
pp. 235-243
Author(s):  
I. A. Idrisov ◽  
T. N. Khafizov ◽  
R. R. Khafizov ◽  
I. Kh. Shaymuratov ◽  
E. E. Abhalikova ◽  
...  
Keyword(s):  
Screening Method ◽  
Cost Effective ◽  
Renal Arteries ◽  
Arterial Stenosis ◽  
Cochrane Library ◽  
Management Approach ◽  
Fractional Flow ◽  
Flow Reserve ◽  
Magnetic Resonance Imaging Mri ◽  
Peripheral Arterial

Peripheral arterial atherosclerosis, i.a., in renal arteries, is quite a regular pathology. Despite long clear aetiology and pathogenesis, a unified systemic management approach in such patients is still lacking. We have reviewed and analysed classical academic resources and scientific record databases (Cochrane Library, PubMed and Google Scholar) in the topic and engaged self-experience on the observation and treatment of patients with stenotic peripheral arteries. Ultrasonic duplex scanning (USDS) of renal arteries is the most accessible and cost-effective screening method to date. Among non-invasive techniques are magnetic resonance imaging (MRI) and contrast-enhanced multislice computed tomography (MSCT). Subtraction angiography remains the gold standard for deciding a surgical treatment, and intravascular diagnostic capacities grow as well. Today’s interventional radiology is powered by fractional flow reserve (FFR) measurement, intravascular ultrasound (IVUS) and optical coherence tomography (OCT).The management of patients with narrowed renal arteries remains relevant and requires further insight. A continuing accumulation and synthesis of experience in diagnosis and treatment of peripheral arterial stenosis is imperative. Current medicine relies on high technologies in the discovery and treatment of peripheral arterial stenosis. The quality of patient management directly relates to the hospital technical and financial level, the personnel competence and mastery of current state-of-the-art.

scholarly journals Deferral Versus Performance of Revascularization for Coronary Stenosis With Grey Zone Fractional Flow Reserve Values: A Systematic Review and Meta-Analysis

Angiology ◽  
2019 ◽  
Vol 71 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Yu Du ◽  
Yan Liu ◽  
Gaojun Cai ◽  
Bangguo Yang ◽  
Yujing Cheng ◽  
...  
Keyword(s):  
Fractional Flow Reserve ◽  
Coronary Stenosis ◽  
Meta Analysis ◽  
Cochrane Library ◽  
Grey Zone ◽  
Cardiac Events ◽  
Fractional Flow ◽  
Target Vessel Revascularization ◽  
Flow Reserve ◽  
Inverse Variance

We searched PubMed, EMBASE, Cochrane Library, and Web of Science for studies using fractional flow reserve (FFR) to determine whether revascularization should be performed or deferred for patients with coronary stenosis and grey zone FFR. Meta-analysis was performed using the generic inverse variance method, and hazard ratios (HR) were synthesized with a random-effects model. Of 2766 records, 7 nonrandomized studies including 2683 patients were selected. The pooled results demonstrated, during a median follow-up of 32 months, that revascularization significantly reduced the risk of major adverse cardiac events (MACE; 7 studies: HR [95% confidence interval, CI]: 0.65 [0.45-0.93], P = .02) and target vessel revascularization (TVR; 4 studies: HR [95% CI]: 0.52 [0.36-0.76], P < .01). Whereas revascularization was not significantly superior in terms of all-cause death (3 studies: HR [95% CI]: 0.56 [0.26-1.22], P = .14), cardiac death (2 studies: HR [95% CI]: 0.57 [0.16-2.01], P = .38), myocardial infarction (MI; 4 studies: HR [95% CI]: 1.03 [0.26-4.03]), and all-cause death or MI (3 studies: HR [95% CI]: 0.66 [0.20-2.19], P = .50). Therefore, revascularization appeared to be superior to deferral for patients with grey zone FFR in MACE and TVR, while hard end points did not show such significance. This work was registered in PROSPERO (CRD42019118432).

Noninvasive Functional Characterization of Coronary Plaques by Coronary Computed Tomography – Beyond the Morphology of Vulnerable Plaques

2019 ◽  
Vol 4 (3) ◽  
pp. 132-135
Author(s):  
Zsolt Parajkó ◽  
András Mester ◽  
István Kovács ◽  
Lehel Bordi ◽  
Ioana Cîrneală ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Coronary Stenosis ◽  
Functional Characterization ◽  
Screening Method ◽  
Functional Evaluation ◽  
Fractional Flow ◽  
Coronary Computed Tomography ◽  
Flow Reserve ◽  
Coronary Lesions

Abstract Coronary computed tomography angiography (CCTA) is a reliable screening method of patients with coronary artery disease (CAD). CCTA is capable to assess both coronary stenosis and plaque morphology, but does not provide hemodynamic characterization of the coronary lesions. However, the severity of coronary stenosis does not always reflect the hemodynamic significance of the plaque. Invasive fractional flow reserve (FFR) is considered the gold standard for the functional evaluation of a potential ischemia-causing stenosis. FFR derived from CCTA (FFR-CT) is a new noninvasive diagnostic tool, using a typically acquired CCTA, without the need for any further radiation or medication. Additional functional assessment of the coronary lesions permits a more complex characterization of CAD patients. Based on the FFR-CT examination, patients who need invasive coronary intervention can be selected more precisely, and a more personalized and optimized treatment can be provided.

Fractional Flow Reserve: Does a Cut-off Value add Value?

2016 ◽  
Vol 11 (1) ◽  
pp. 17
Author(s):  
Shah R Mohdnazri ◽  
◽  
◽  
◽  
Thomas R Keeble ◽  
...  
Keyword(s):  
Fractional Flow Reserve ◽  
Coronary Intervention ◽  
Grey Zone ◽  
Fractional Flow ◽  
Non Invasive ◽  
Invasive Test ◽  
Flow Reserve ◽  
A Value ◽  
Percutaneous Coronary ◽  
Value Add

Fractional flow reserve (FFR) has been shown to improve outcomes when used to guide percutaneous coronary intervention (PCI). There have been two proposed cut-off points for FFR. The first was derived by comparing FFR against a series of non-invasive tests, with a value of ≤0.75 shown to predict a positive ischaemia test. It was then shown in the DEFER study that a vessel FFR value of ≥0.75 was associated with safe deferral of PCI. During the validation phase, a ‘grey zone’ for FFR values of between 0.76 and 0.80 was demonstrated, where a positive non-invasive test may still occur, but sensitivity and specificity were sub-optimal. Clinical judgement was therefore advised for values in this range. The FAME studies then moved the FFR cut-off point to ≤0.80, with a view to predicting outcomes. The ≤0.80 cut-off point has been adopted into clinical practice guidelines, whereas the lower value of ≤0.75 is no longer widely used. Here, the authors discuss the data underpinning these cut-off values and the practical implications for their use when using FFR guidance in PCI.

Epicardial coronary stenosis severity and myocardial perfusion

2020 ◽  
pp. 12-16
Keyword(s):  
Myocardial Perfusion ◽  
Myocardial Ischemia ◽  
Coronary Disease ◽  
Myocardial Perfusion Reserve ◽  
Pharmacological Intervention ◽  
Fractional Flow ◽  
Perfusion Reserve ◽  
Flow Reserve ◽  
Stenosis Severity ◽  
Microvascular Resistance

Patients suspected of having epicardial coronary disease are often investigated with noninvasive myocardial ischemia tests to establish a diagnosis and guide management. However, the relationship between myocardial ischemia and coronary stenoses is affected by multiple factors, and there is marked biological variation between patients. The ischemic cascade represents the temporal sequence of pathophysiological events that occur after interruption of myocardial oxygen delivery. The earliest part of the cascade is examined via perfusion imaging, and fractional flow reserve (FFR) is a corresponding index which is specific to the coronary artery. Whereas FFR has come to be regarded a clinical reference standard against which other newer invasive and noninvasive tests are validated, the diagnostic FFR threshold for detecting ischemia was established against a combination of noninvasive ischemia tests that assessed different stages of the ischemic cascade. Moreover, the validity of invasive pressure-derived indices of stenosis severity are contingent on the assumption that pressure is proportional to flow if microvascular resistance is constant, a condition induced by pharmacological intervention or by examining specific segments of the cardiac cycle. Furthermore, myocardial perfusion reserve depends on dynamic modulation of microvascular resistance, and dysfunction of the microvasculature can lead to ischemia even in the absence of epicardial coronary disease.

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