What question did this study set out to answer?

Establish Doppler frequency shift criteria for grading internal carotid artery stenosis and evaluate the diagnostic accuracy and potential pitfalls of duplex sonography.

February 1, 1985Radiology

Duplex carotid sonography: criteria for stenosis, accuracy, and pitfalls.

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Authors

NJN M Jacobs EGE G GrantUniversity of California, Los Angeles DSDieter SchellingerGeorgetown University

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Overview

Diagnostic study demonstrates high accuracy for ultrasound frequency criteria in patients with suspected carotid disease, suggesting duplex sonography reliably detects severe arterial narrowing.

Key Points

Establish Doppler frequency shift criteria for grading internal carotid artery stenosis and evaluate the diagnostic accuracy and potential pitfalls of duplex sonography.
Evaluated bilateral carotid bifurcations in 353 patients over a 20-month period using real-time and pulsed Doppler ultrasound with a 5 MHz input frequency and 60-degree scan angle.
Correlated sonographic criteria based on peak frequency shift and waveform distortion against contrast angiography in 72 cases.
Defined peak frequency shift thresholds for stenosis: ≤30% (<3.5 kHz), 31–50% (3.5–4.0 kHz with moderate turbulence), 51–90% (4.0–8.0 kHz), >90% (>8.0 kHz), and >95% subtotal stenosis (<8.0 kHz with total waveform distortion).
Overall diagnostic accuracy improved from 77% during the first 6 months to 87% across the final 14 months.
Sensitivity for detecting stenosis greater than 50% increased from 82% in the initial 6 months to 97% over the subsequent 14 months.

Cite This Study

Jacobs et al. (1985) studied this question.

synapsesocial.com/papers/6a1286cfc031bb6829a6cda3 https://doi.org/10.1148/radiology.154.2.3880910

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February 1, 1985Radiology

Duplex carotid sonography: criteria for stenosis, accuracy, and pitfalls.

View Full Paper

Ask AI

Bookmark

Authors

NJN M Jacobs EGE G GrantUniversity of California, Los Angeles DSDieter SchellingerGeorgetown University

Discussion

Member takes

Overview

Diagnostic study demonstrates high accuracy for ultrasound frequency criteria in patients with suspected carotid disease, suggesting duplex sonography reliably detects severe arterial narrowing.

Key Points

Establish Doppler frequency shift criteria for grading internal carotid artery stenosis and evaluate the diagnostic accuracy and potential pitfalls of duplex sonography.
Evaluated bilateral carotid bifurcations in 353 patients over a 20-month period using real-time and pulsed Doppler ultrasound with a 5 MHz input frequency and 60-degree scan angle.
Correlated sonographic criteria based on peak frequency shift and waveform distortion against contrast angiography in 72 cases.
Defined peak frequency shift thresholds for stenosis: ≤30% (<3.5 kHz), 31–50% (3.5–4.0 kHz with moderate turbulence), 51–90% (4.0–8.0 kHz), >90% (>8.0 kHz), and >95% subtotal stenosis (<8.0 kHz with total waveform distortion).
Overall diagnostic accuracy improved from 77% during the first 6 months to 87% across the final 14 months.
Sensitivity for detecting stenosis greater than 50% increased from 82% in the initial 6 months to 97% over the subsequent 14 months.

Cite This Study

Jacobs et al. (1985) studied this question.

synapsesocial.com/papers/6a1286cfc031bb6829a6cda3 https://doi.org/10.1148/radiology.154.2.3880910

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