1,721,071 research outputs found
Self-Inflicted Radial Artery Pseudoaneurysm Due to Attempted Needle Drainage of a Suspected Abscess
Full text linkAccessory renal artery stenosis and hypertension: are these correlated? Evaluation using multidetector-row computed tomographic angiography.
No full textBACKGROUND:
Renal artery stenosis may produce hypertension, and this condition is referred to as renovascular hypertension (RVH).
PURPOSE:
To evaluate, by using multidetector-row spiral computed tomographic angiography (MDCTA), whether a relationship between accessory renal artery stenosis and hypertension may be hypothesized.
MATERIAL AND METHODS:
214 patients (142 males, 72 females; mean age 66 years) who had previously undergone an MDCTA to study the abdominal vasculature were retrospectively studied. Patients with renal artery stenosis (RAS) were excluded from this analysis. The patients were studied by means of a four-detector-row CT, and scans were obtained after intravenous bolus administration of 110-140 ml of a nonionic contrast material with a 3-6 ml/s flow rate. As a second step, by means of statistical analysis, hypertension data were compared with findings of accessory artery stenosis. Two radiologists first independently reviewed the MDCTA images and then, in case of disagreement, in consensus. Interobserver agreement was calculated for all measurements.
RESULTS:
The overall number of detected accessory renal arteries was 74 in 56 of the 214 patients. Accessory renal artery stenosis was detected in 21 of the 56 patients. There was a difference in the prevalence of hypertension between patients with (n = 21) and without (n = 35) accessory renal artery stenosis (P = 0.0187). Interobserver agreement was good (kappa value 0.733).
CONCLUSION:
Any statistical association between the presence of accessory renal artery stenosis and hypertension could not be disclosed. However, accessory renal artery stenosis, detected by MDCTA, is an important pathological sign that the radiologist has to assess in the light of its possible association with hypertension
Agreement between multidetector-row CT angiography and ultrasound echo-color Doppler in the evaluation of carotid artery stenosis
No full textPURPOSE:
Stroke is a leading cause of severe disability in the western world. A correct diagnostic procedure to stratify risk is necessary in order to rapidly plan the most efficient therapy. The purpose of this work was to evaluate the agreement between ultrasound echo-color Doppler (US-ECD) and multidetector-row CT angiography (MDCTA) in determining the degree of carotid stenosis.
METHODS AND MATERIALS:
From January 2004 to February 2007, 187 patients who had previously undergone both US-ECD and MDCTA were studied retrospectively. For each patient, stenosis degree was measured by applying the North American Symptomatic Carotid Endarterectomy Trial criteria. Data derived from MDCTA and US-ECD were then compared to calculate the inter-technique variability by using Cohen kappa statistics. For all plaque types (fatty, mixed and calcified), inter-technique variability was assessed. The Wilcoxon signed-rank test was used to highlight differences between the procedures, and scatterplots were also calculated. As a gold standard, reference surgical comparisons were performed in 50 patients.
RESULTS:
The percentage of observed agreements in the evaluation of stenosis degree was 72.19% with a kappa value of 0.659 (95% confidence interval: 0.604-0.715) and a weighted kappa of 0.789. After the evaluating stenosis degree in fatty, mixed and calcified plaques, the percentages of observed agreements were 79.31, 74.58 and 64.29%, respectively, with kappa values of 0.738, 0.691 and 0.565.
CONCLUSION:
A good agreement between US-ECD and MDCTA in the evaluation of stenosis degree was observed, together with a remarkable difference between the 2 techniques in the assessment both of calcified plaques and of plaques showing a predominant calcific component
Hypertension and carotid artery stenosis. A correlative study by using multi-detector-row CT Angiography
No full text
Carotid Artery Wall Thickness Measured Using CT: Inter- and Intraobserver Agreement Analysis
No full textThe purpose of this work was to compare inter- and intraobserver agreement in the analysis of CAWT by using MDCTA. The CAWT in 35 patients was quantified by 4 observers. Bland-Altman statistics were used to measure the agreement between observers. The results of our study demonstrated that the CAWT measured by using MDCTA shows a good reproducibility between observers by considering inter- and intraobserver agreement
Carotid artery wall thickness (CAWT) and enhancement patterns of the vascular wall by using multi-detector-row CT angiography
No full text
Efficacy and sensitivity of axial scans and different reconstruction methods in the study of the ulcerated carotid plaque using multidetector-row CT angiography: Comparison with surgical results
No full textBACKGROUND AND PURPOSE:
Carotid plaque ulceration is an important risk factor for stroke, and its diagnosis may be very important to plan a correct therapeutic approach. We hypothesized that axial scans and various reconstruction methods could have different specificity and sensitivity in the study of plaque ulceration. The object of this study was to evaluate their role and diagnostic efficacy in patients with carotid plaque complicated by ulceration through the comparison with surgical results. Materials and
METHODS:
From January 2004 to November 2005, 109 patients who underwent a carotid endarterectomy were analyzed using CT angiography for a total of 218 carotid arteries. We assessed every carotid for the presence of ulcerations. For each patient axial image, maximum intensity projection (MIP), multiplanar reconstruction (MPR), shaded surface display (SSD), and volume rendering (VR) reconstructions were obtained.
RESULTS:
Multidetector row CT angiography (MDCT) found 32 ulcerations; surgical confirmation underlined an overall 93.9% sensitivity (95% confidence interval [CI] 0.858-1.021), and a 98.7% specificity (95% CI, 0.961-1.012). Axial scans and volume rendering images demonstrated the highest sensitivity (90.9% and 87.9%, respectively); SSD, on the contrary, showed the lowest sensitivity: 39.4% (95% CI sensitivity, 0.227-0.561).
CONCLUSION:
Axial scans plus VR reconstruction techniques offer superior depiction of carotid plaque ulceration compared with MIP, MPR, and SSD
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