-
BioMed Research International 2021A 125 cm long catheter makes it possible to perform renal arteriography via radial artery, but its feasibility and safety remain unclear. Our study recruited 1,323...
A 125 cm long catheter makes it possible to perform renal arteriography via radial artery, but its feasibility and safety remain unclear. Our study recruited 1,323 patients grouped by two different vascular accesses to renal arteriography, i.e., femoral artery access and radial artery access. The success rate of angiography was 100% in both groups. Differential analysis showed that the overall complication incidence of radial artery access group was significantly lower (2.5% for radial artery access vs. 4.8% for femoral artery access, = 0.03). From this study, we suggest that using the 125 cm angiographic catheter to perform renal arteriography via radial artery access is feasible and safe.
Topics: Adult; Aged; Aged, 80 and over; Angiography; Catheters; Female; Femoral Artery; Humans; Kidney; Male; Middle Aged; Radial Artery; Renal Artery; Retrospective Studies
PubMed: 33977105
DOI: 10.1155/2021/5564462 -
British Medical Journal Sep 1980
Topics: Angiography; Brachial Artery; Coronary Angiography; Coronary Disease; Femoral Artery; Humans; Myocardial Infarction; Risk
PubMed: 7437741
DOI: No ID Found -
European Journal of Vascular and... Sep 2013To evaluate the diagnostic accuracy of computed tomography angiography (CTA) in detecting arterial lesions in patients with suspected arterial injury of the upper or... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVES
To evaluate the diagnostic accuracy of computed tomography angiography (CTA) in detecting arterial lesions in patients with suspected arterial injury of the upper or lower extremity due to trauma.
METHODS
A systematic review and meta-analysis was carried out. Medline and Embase were searched on August 13, 2012, for studies comparing CTA with surgery, digital subtraction angiography (DSA), or follow-up, which allowed extraction of data into two-by-two tables. The methodological quality of included studies was assessed using the QUADAS tool. Summary estimates of sensitivity and specificity of CTA in identifying or excluding arterial lesions were obtained using a bivariate model.
RESULTS
This review included 11 studies making up a total of 891 trauma patients. The included studies were of moderate methodological quality and at risk of misclassification and verification bias. Some 4.2% of all CTA studies were non-diagnostic. The summary estimates of sensitivity and specificity of CTA were 96.2% (95% CI 93.5-97.8%) and 99.2% (95% CI 96.8-99.8%), respectively.
CONCLUSION
Despite methodological flaws, the excellent estimates of sensitivity and specificity indicate that CTA is an accurate modality for evaluating arterial lesions in patients with extremity trauma and can replace DSA.
Topics: Angiography; Angiography, Digital Subtraction; Arm Injuries; Humans; Leg Injuries; Peripheral Vascular Diseases; Sensitivity and Specificity; Tomography, X-Ray Computed; Vascular System Injuries
PubMed: 23726770
DOI: 10.1016/j.ejvs.2013.04.034 -
Revista Da Associacao Medica Brasileira... 2003Recent advances in Medical Science and the thechnological improvements in the field of myocardial revascularisation, in surgical procedures and in percutaneous... (Review)
Review
Recent advances in Medical Science and the thechnological improvements in the field of myocardial revascularisation, in surgical procedures and in percutaneous interventions, made attractive the initial option for invasive strategies in the management of coronary heart disease. For this reason, coronary arteriography is nowadays more often indicated. Some concepts in coronary heart disease have been reviewed, specially those related to acute coronary syndromes. Non-ST-segment elevation myocardial infarction (previously called non-Q wave myocardial infarction) and unstable angina are now considered "unstable acute coronary syndromes" and both have the same guidelines for management. The main indications for coronary arteriography as the first diagnostic tool are: 1) incapacitating angina, even in stable patients; 2) high-risk patients with unstable coronary syndromes (refractory angina, troponin elevation, new ST- segment deviations, cardiac failure and serious arrythmias); 3) patients with acute ST-elevation myocardial infarction that will be submitted to primary angioplasty or with hemodynamic instability or persistent ischemia. Low-risk patients (angina that promptly subsides after medication, no electrocardiographic or laboratorial changes or atypical chest pain) may be submitted to non-invasive testing for further risk stratification; if no ischemia is detected, coronary arteriography is not indicated and optimized medical treatment is perfectly admitted for a great number of patients. The indications of coronary arteriography for the diagnosis and prognosis of coronary heart disease are not well delimited in clinical practice, and this method is frequently used as the first tool in the investigation of chest pain, even when the characteristics of pain are not exactly those of angina. In this review, the authors discuss the main indications of coronary arteriography in the multiple clinical aspects of coronary heart disease and in the differential diagnosis of chest pain.
Topics: Angina Pectoris; Cineangiography; Coronary Angiography; Coronary Disease; Electrocardiography; Humans; Myocardial Infarction; Risk Assessment
PubMed: 12886401
DOI: 10.1590/s0104-42302003000200042 -
Fukushima Journal of Medical Science Jun 2009We assessed the usefulness of the separate demonstration of the arterial- and venous phase on 3D-CT angiography (3D-CTA) using a 64-multidetector row CT (MDCT) scanner...
We assessed the usefulness of the separate demonstration of the arterial- and venous phase on 3D-CT angiography (3D-CTA) using a 64-multidetector row CT (MDCT) scanner for the surgery of brain tumors. Nineteen patients with meningiomas (n=11), schwannomas, metastatic brain tumors (n=2 each), glioblastoma multiforme, malignant lymphoma, craniopharyngioma, and embryonal carcinoma (n=1 each) underwent scanning on a 64-MDCT scanner. After dynamic CT scanning to determine the scan timing for the arterial- and venous-phase, we individually scanned the arterial- and venous phase for 4 sec after injecting a nonionic contrast medium. Using the CT threshold setting and subtraction and cutting techniques, we produced individual 3D-CT images of the arteries, veins, tumors, and bones. The operators subjectively assessed the usefulness of these images in comparison with 3D-CTA. We separately demonstrated the arterial- and venous phase on 3D-CTA covering the entire head in all 19 cases. The 3D-CT arteriographs, 3D-CT venographs, and the fused 3D-CT images facilitated our understanding of the 3D anatomic relationship among the tumor, arteries, veins, and bony structures. In 14 of 19 cases our method provided the surgically valuable findings; the information on the anatomical relation between tumor and the surrounding arteries and veins (in 13 cases) the identification of anatomical course of the encased vessels (in one), and feeding arteries and draining veins (in one), and discrimination between the venous sinus and tumor (in one). The anatomical information yielded by our technique makes safer surgery possible. If more detailed information which 3D-CTA cannot provide is required, our method should be performed.
Topics: Adult; Aged; Angiography; Arteries; Brain Neoplasms; Female; Humans; Imaging, Three-Dimensional; Male; Middle Aged; Phlebography; Tomography, X-Ray Computed; Veins
PubMed: 19999165
DOI: 10.5387/fms.55.7 -
Journal of Cerebral Blood Flow and... Aug 2022The pathogenesis of idiopathic intracranial hypertension (IIH) is attributed to segmental stenosis of the venous sinus. The current treatment paradigm requires a...
The pathogenesis of idiopathic intracranial hypertension (IIH) is attributed to segmental stenosis of the venous sinus. The current treatment paradigm requires a trans-stenotic pressure gradient of ≥8 mmHg or ≥6 mmHg threshold. This study aimed to develop a machine learning screening method to identify patients with IIH using hemodynamic features. A total of 204 venous manometry instances (n = 142, training and validation; n = 62, test) from 135 patients were included. Radiomic features extracted from five arteriography perfusion parameter maps were selected using least absolute shrinkage and selection operator and then entered into support vector machine (SVM) classifiers. The Thr8-23-SVM classifier was created with 23 radiomic features to predict if the pressure gradient was ≥8 mmHg. On an independent test dataset, prediction sensitivity, specificity, accuracy, and AUC were 0.972, 0.846, 0.919, and 0.980, respectively (95% confidence interval: 0.980-1.000). For the 6 mmHg threshold, thr6-28-SVM incorporated 28 features, and its sensitivity, specificity, accuracy, and AUC were 0.923, 0.956, 0.935, and 0.969, respectively (95% confidence interval: 0.927-1.000). The trans-stenotic pressure gradient result was associated with perfusion pattern changes, and SVM classifiers trained with arteriography perfusion map-derived radiomic features could predict the 8 mmHg and 6 mmHg dichotomized trans-stenotic pressure gradients with favorable accuracy.
Topics: Angiography; Constriction, Pathologic; Hemodynamics; Humans; Pseudotumor Cerebri; Retrospective Studies; Support Vector Machine
PubMed: 35255760
DOI: 10.1177/0271678X221086408 -
PloS One 2020For quantification of Optical Coherence Tomography Angiography (OCTA) images, Vessel Density (VD) and Vessel Skeleton Density (VSD) are well established parameters and... (Comparative Study)
Comparative Study
INTRODUCTION
For quantification of Optical Coherence Tomography Angiography (OCTA) images, Vessel Density (VD) and Vessel Skeleton Density (VSD) are well established parameters and different algorithms are in use for their calculation. However, comparability, reliability and ability to discriminate healthy and impaired macular perfusion of different algorithms are unclear, yet, of potential high clinical relevance. Hence, we assessed comparability and test-retest reliability of the most common approaches.
MATERIALS AND METHODS
Two consecutive 3×3mm OCTA en face images of the superficial and deep retinal layer were acquired with swept-source OCTA. VD and VSD were calculated with manual thresholding and six automated thresholding algorithms (Huang, Li, Otsu, Moments, Mean, Percentile) using ImageJ and compared in terms of intra-class correlation coefficients, measurement differences and repeatability coefficients. Receiver operating characteristic analyses (healthy vs. macular pathology) were performed and Area Under the Curve (AUC) values were calculated.
RESULTS
Twenty-six eyes (8 female, mean age: 47 years) of 15 patients were included (thereof 15 eyes with macular pathology). Binarization thresholds, VD and VSD differed significantly between the algorithms and compared to manual thresholding (p < 0.0001). Inter-measurement differences did not differ significantly between patients with healthy versus pathologic maculae (p ≥ 0.685). Reproducibility was higher for the automated algorithms compared to manual thresholding on all measures of reproducibility assessed. AUC was significantly higher for the Mean algorithm compared to the manual approach with respect to the superficial retinal layer.
CONCLUSIONS
Automated thresholding algorithms yield a higher reproducibility of OCTA parameters and allow for a more sensitive diagnosis of macular pathology. However, different algorithms are not interchangeable nor results readily comparable. Especially the Mean algorithm should be investigated in further detail. Automated thresholding algorithms are preferable but more standardization is needed for clinical use.
Topics: Algorithms; Angiography; Automation; Female; Humans; Macular Degeneration; Male; Middle Aged; Reproducibility of Results; Tomography, Optical Coherence
PubMed: 32196538
DOI: 10.1371/journal.pone.0230260 -
Journal of the American College of... May 1991Recent research advances in the area of quantitative coronary arteriography are described with respect to their potential role in assessing the effects of interventional... (Review)
Review
Recent research advances in the area of quantitative coronary arteriography are described with respect to their potential role in assessing the effects of interventional therapy and monitoring the restenosis process. Specific areas emphasized are the importance of quantitative arteriography and absolute measures of arterial dimension in monitoring restenosis, the development of a computerized method for measuring lesion roughness, the potential role of measuring stenosis flow reserve based on component analysis principles, limitations of direct measures of myocardial flow reserve using a digital angiographic method and cautionary notes about clinical applications of videodensitometry. The current use of radiography and quantitative measures in limiting arterial injury are briefly reviewed. Finally, a perspective is put forth on the need to develop complementary roles for endovascular echocardiography and angioscopy with existing radiographic imaging technology.
Topics: Angiography, Digital Subtraction; Animals; Blood Flow Velocity; Cardiac Catheterization; Coronary Angiography; Coronary Circulation; Coronary Disease; Densitometry; Humans; Recurrence
PubMed: 2016479
DOI: 10.1016/0735-1097(91)90935-3 -
Journal of Biomedical Optics Jun 2017Challenge persists in the field of optical coherence tomography (OCT) when it is required to quantify capillary blood flow within tissue beds in vivo. We propose a...
Challenge persists in the field of optical coherence tomography (OCT) when it is required to quantify capillary blood flow within tissue beds in vivo. We propose a useful approach to statistically estimate the mean capillary flow velocity using a model-based statistical method of eigendecomposition (ED) analysis of the complex OCT signals obtained with the OCT angiography (OCTA) scanning protocol. ED-based analysis is achieved by the covariance matrix of the ensemble complex OCT signals, upon which the eigenvalues and eigenvectors that represent the subsets of the signal makeup are calculated. From this analysis, the signals due to moving particles can be isolated by employing an adaptive regression filter to remove the eigencomponents that represent static tissue signals. The mean frequency (MF) of moving particles can be estimated by the first lag-one autocorrelation of the corresponding eigenvectors. Three important parameters are introduced, including the blood flow signal power representing the presence of blood flow (i.e., OCTA signals), the MF indicating the mean velocity of blood flow, and the frequency bandwidth describing the temporal flow heterogeneity within a scanned tissue volume. The proposed approach is tested using scattering phantoms, in which microfluidic channels are used to simulate the functional capillary vessels that are perfused with the scattering intralipid solution. The results indicate a linear relationship between the MF and mean flow velocity. In vivo animal experiments are also conducted by imaging mouse brain with distal middle cerebral artery ligation to test the capability of the method to image the changes in capillary flows in response to an ischemic insult, demonstrating the practical usefulness of the proposed method for providing important quantifiable information about capillary tissue beds in the investigations of neurological conditions in vivo.
Topics: Angiography; Animals; Blood Flow Velocity; Capillaries; Mice; Rheology; Tomography, Optical Coherence
PubMed: 28617921
DOI: 10.1117/1.JBO.22.6.066008 -
Scientific Reports Dec 2021This is a prospective observational study to establish the short- and long-term repeatability of measurements of peripapillary optical coherence tomography angiography... (Observational Study)
Observational Study
This is a prospective observational study to establish the short- and long-term repeatability of measurements of peripapillary optical coherence tomography angiography (OCTA) parameters in healthy eyes and identify factors affecting long-term repeatability. We enrolled 84 healthy eyes. Participants with a history of any ophthalmic disease (except high myopia) or intraocular surgery were excluded from the study. An experienced examiner performed OCTA using disc-centered 6 × 6 mm scans. All examinations were conducted twice at 5-min intervals at the initial visit and repeated at least 6 months later. For short-term repeatability, the coefficient of variation (CV) was 2.94-4.22% and the intraclass correlation coefficient (ICC) was 0.840-0.934. For long-term repeatability, the CV was 2.73-3.84% and the ICC was 0.737-0.934. Multivariate analyses showed that the axial length (AL) (B = 0.970; p = 0.002) and mean signal strength (SS) (B = - 2.028; p < 0.001) significantly affected long-term repeatability. Measurements of peripapillary OCTA parameters exhibited excellent short-term and good long-term repeatability in healthy individuals. The mean SS and AL affected long-term repeatability and should be considered while interpreting peripapillary OCTA images.
Topics: Adult; Aged; Angiography; Female; Humans; Male; Middle Aged; Reproducibility of Results; Retinal Vessels; Tomography, Optical Coherence
PubMed: 34903817
DOI: 10.1038/s41598-021-03469-4