Usefulness of acceleration time for assessment of stenosis in the extracranial internal carotid artery

Takekawa, Hidehiro; Asakawa, Yohei; Lee, Tonguk; Yamamoto, M.; Okabe, Ryuta; Tanaka, Hideaki; Hirata, Koichi

doi:10.2301/neurosonology.22.79

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…They also compared the AcT ratio and degree of stenosis, and reported that an AcT ratio of 1.5 or higher suggests NASCET 50% or severer stenosis and that an AcT of 2.0 or higher suggests NASCET 70% or severer stenosis. 11) In our study, we did not perform transthoracic echocardiography in all patients and did not precisely evaluate AS, but patients with severe AS, confirmed by checking with the chart or attending physician, were excluded. With a check of the history for AS, evaluation of stenosis at the origin of the ICA is consid- …”

Section: Resultsmentioning

confidence: 99%

Usefulness of Acceleration Time for Internal Carotid Artery Origin Stenosis

Tamura¹,

Akaiwa

Onda³

2013

Annals of Vascular Diseases

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Section: Resultsmentioning

confidence: 99%

Usefulness of Acceleration Time for Internal Carotid Artery Origin Stenosis

Tamura¹,

Akaiwa

Onda³

2013

Annals of Vascular Diseases

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“…Previous studies demonstrated that a maxPSV over 200 cm/sec at the stenotic site on Doppler ultrasonography corresponded to a stenosis of 70% by the North American Symptomatic Carotid Endarterectomy Trial (NASCET) criteria in patients with internal carotid artery stenosis, 1) and that the prolongation of the AcT to ≥110 msec at the distal carotid artery suggested a stenosis of over 60% by the NASCET criteria at its origin. 6,7) Another study reported that similar findings were useful for the diagnosis of stenosis at VA origin. 8) In this study, we performed Doppler ultrasonography of the VA in patients with posterior circulation ischemia as screening to determine whether cerebral angiography should be indicated.…”

Section: Discussionmentioning

confidence: 85%

Doppler Ultrasonography for the Assessment of Proximal Vertebral Artery Stenosis

Koizumi

Yamaoka

Shojima

et al. 2018

JNET

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We examined the usefulness of Doppler ultrasonography for the diagnosis of severe stenosis of the proximal vertebral artery (VA). Case Presentations: We performed Doppler ultrasonography of the VA in patients diagnosed with cerebral ischemia of the posterior circulation. Incorporating the diagnostic criteria for severe stenosis at the origin of the internal carotid artery (maximum peak systolic flow velocity: ≥200 cm/sec, or acceleration time: ≥110 msec), patients were screened for proximal VA stenosis and cerebral angiography was conducted if they fulfilled the above criteria. In all six patients in whom proximal VA stenosis was suspected on ultrasonography, angiography confirmed severe stenosis, and endovascular treatment was performed. In five patients who underwent postoperative ultrasonography, an improvement of the stenosis was confirmed. Conclusion: Doppler ultrasonography is useful for the screening and postoperative assessment of proximal VA stenosis.

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“…Although these past reports suggested that AcT and the AcT ratio were useful in the diagnosis of stenosis of ICA origin, there was still a variance with the ICA-AcT cutoff values of 85-150 ms [4,6,8], and AcT ratios of 1.31-1.75 [4,5,8], even in stenosis rates considered to be DSA-NAS-CET ≥ 50%.…”

Section: Discussionmentioning

confidence: 89%

“…There are few reports on the diagnosis of ICA origin stenosis, where the AcT or the AcT ratio was used [4][5][6][7][8]. Takekawa et al [4] reported on 127 blood vessels, where the PSV and the ICA-AcT exhibited a significant positive correlation. Tamura et al [6] evaluated 266 blood vessels using carotid artery ultrasonography.…”

Section: Discussionmentioning

confidence: 99%

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Suitable methods of measuring acceleration time in the diagnosis of internal carotid artery stenosis

et al. 2020

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Purpose To enhance the utility of acceleration time (AcT) in the diagnosis of internal carotid artery (ICA) stenosis, we assessed the value of AcT measurements with different waveform patterns. Methods Ninety-three patients with acute atherothrombotic cerebral infarction were enrolled, and they underwent both carotid ultrasonography and digital subtraction angiography (DSA). AcT was determined by a conventional procedure (using the first peak point or the bending point) and the peak systolic velocity (PSV) procedure. The AcT ratio was calculated as (AcT of ICA)/(AcT of the ipsilateral common carotid artery). We evaluated the correlation of stenosis rate as assessed by the North American Symptomatic Carotid Endarterectomy Trial method using DSA (DSA-NASCET) with the AcT of ICA (ICA-AcT), the AcT ratio measured by the conventional procedure (conventional AcT ratio), and the AcT ratio measured by the PSV procedure (PSV AcT ratio). The area under receiver operating characteristic curves (AUC) for DSA-NASCET was calculated based on the ICA-AcT and AcT ratio. Results Forty-five vessels had 50% or greater ICA stenosis. DSA-NASCET was positively correlated with the conventional AcT ratio (r = 0.723), conventional ICA-AcT (r = 0.638), and PSV AcT ratio (r = 0.245). The corresponding AUCs for ICA stenosis ≥ 50% were 0.971, 0.886, and 0.572, respectively. Conclusion We demonstrated the usefulness of the conventional procedure for diagnosing stenosis of ICA origin using AcT and showed that the AcT ratio was a more beneficial parameter than AcT.

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Usefulness of acceleration time for assessment of stenosis in the extracranial internal carotid artery

Cited by 8 publications

References 5 publications

Usefulness of Acceleration Time for Internal Carotid Artery Origin Stenosis

Usefulness of Acceleration Time for Internal Carotid Artery Origin Stenosis

Doppler Ultrasonography for the Assessment of Proximal Vertebral Artery Stenosis

Suitable methods of measuring acceleration time in the diagnosis of internal carotid artery stenosis

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