A validation study on the intraobserver and interobserver reproducibility of renal artery duplex ultrasound

Baumgartner, Iris; Behrendt, P; Rohner, P; Baumgartner, Ralf W.

doi:10.1016/s0301-5629(98)00142-2

Cited by 26 publications

(24 citation statements)

References 18 publications

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“…These results agree with the findings of Baumgartner and associates, that while examining the reproducibility of this method in healthy individuals, demonstrated that the RAR presented an average of 0.85 ± 0.41, suggesting that values lower than 3.5 could be associated with significant renal artery stenosis, without losing the specificity of the method 20 . Although a RAR of 3.5 had produced an elevated specificity (93%) it provoked considerable loss in sensitivity (79%).…”

Section: Discussionsupporting

confidence: 92%

“…Parameters analyzed: PSV and RAR -The technical success rate for detecting the renal arteries was 100%, concurrent with the success rates of recent studies (95-100%) 20,21 . The mean values ± SD of renal artery PSV presented a significant statistical difference (p < 0.005) between the groups with RAS 0-59% and RAS 60-99% (see table 3) in agreement with the results obtained in various publications 22,23,24 .…”

Section: Discussionsupporting

confidence: 64%

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Parâmetros diretos do duplex scan no diagnóstico da estenose da artéria renal: estudo de validação e otimização dos pontos de corte

Cardoso

Xavier

Lopez

et al. 2006

Arq. Bras. Cardiol.

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OBJECTIVETo test the efficiency of the direct duplex scanning parameters in the diagnosis of renal artery stenosis (RAS), and verify whether or not the cut-off points recommended by medical literature are the most appropriate means to distinguish lesion severity. METHODSProspective study, including 62 patients with RAS, submitted to a duplex ultrasound scan and selective arteriography. The peak systolic velocity (PSV) and the renal-aortic ratio (RAR) were measured. Statistical analysis included the ROC (receiver operating characteristic curve), unpaired student's t-test, sensitivity, specificity, positive and negative predictive values and accuracy. RESULTSThe arteriography revealed RAS 0-59% in 31 arteries (24%); RAS 60-99% in 91 arteries (72%) and 5 occlusions (4%). ROC analysis demonstrated that the lesion detection efficiency of PSV and RAR were similar with areas below the curves of 0.96 and 0.95, respectively. Considering the cut-off points recommended by medical literature, PSV of 180 cm/sec presented a sensitivity of 100% and specificity of 81%, while the RAR of 3.5 presented a sensitivity of only 79%, with a specificity of 93%. These parameters were analyzed in conjunction (direct criteria) revealing a sensitivity of 79% and specificity of 97%. The optimized cut-off points were: PSV of 189 cm/sec and RAR of 2.6, demonstrating sensitivity and specificity rates of 100%, 87%, 96% and 87% respectively.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 64%

Parâmetros diretos do duplex scan no diagnóstico da estenose da artéria renal: estudo de validação e otimização dos pontos de corte

Cardoso

Xavier

Lopez

et al. 2006

Arq. Bras. Cardiol.

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“…Als indirekte Stenosekriterien verwendet werden der Resistance-Index nach Pourcelot (RI), der Pulsatilitäts-index und die Akzelerationszeit intrarenal gemessen bzw. die Analyse der intrarenal abgeleiteten pw-Dopplerkurve [1,3,4,11,21,22].…”

Section: Introductionunclassified

Farbduplexsonographische Darstellbarkeit von Nierenarterien und Erkennung hämodynamisch relevanter Nierenarterienstenosen

Zeller

Frank²,

Späth³

et al. 2001

Ultraschall in Med

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“…7 But, still an error range of up to 10% exists and, hence, TCCD measurements are only trustable up to this accuracy. 4 Conversion of quantities With die TCCD device flow velocities instead of volumetric flow as required for the comparison with the flow quantification algorithm were measured. Hence, the extracted projected centerline velocities from TCCD were used together with the information of the vessel radius to compute the volumetric blood flow based on the Womersley assumption of velocity distribution over the vessel cross section.…”

Section: Discussionmentioning

confidence: 99%

Clinical study of model-based blood flow quantification on cerebrovascular data

Groth¹,

Wächter-Stehle²,

Brina³

et al. 2011

SPIE Proceedings

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Diagnosis and treatment decisions of cerebrovascular diseases are currently based on structural information like the endovascular lumen. In future, clinical diagnosis will increasingly be based on functional information which gives direct information about the physiological parameters and, hence, is a direct measure for the severity of the pathology. In this context, an important functional quantity is the volumetric blood flow over time. The proposed flow quantification method uses contrasted X-ray images from cerebrovascular interventions and a model of contrast agent dispersion to estimate the flow parameters from the spatial and temporal development of the contrast agent concentration through the vascular system. To evaluate the model-based blood flow quantification under realistic circumstances, dedicated cerebrovascular data has been acquired during clinical interventions. To this aim, a clinical protocol for this novel procedure has been defined and optimized. For the verification of the measured flow results ultrasound Doppler measurements have been performed acting as ground truth.The clinical data available so far indicates the ability of the proposed flow model to explain the in-vivo transport of contrast agent in blood. The flow quantification results show good correspondence of flow waveform and mean volumetric flow rate with the accomplished ultrasound measurements before angiography. Hence, the method has the potential to give sufficiently accurate, quantitative flow estimates for clinical practice and to be an alternative to ultrasound Doppler.

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A validation study on the intraobserver and interobserver reproducibility of renal artery duplex ultrasound

Cited by 26 publications

References 18 publications

Parâmetros diretos do duplex scan no diagnóstico da estenose da artéria renal: estudo de validação e otimização dos pontos de corte

Parâmetros diretos do duplex scan no diagnóstico da estenose da artéria renal: estudo de validação e otimização dos pontos de corte

Farbduplexsonographische Darstellbarkeit von Nierenarterien und Erkennung hämodynamisch relevanter Nierenarterienstenosen

Clinical study of model-based blood flow quantification on cerebrovascular data

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