What is the clinical evidence from this study?

Study design: Cross-Sectional. Population: Carotid stenosis (n=110). Intervention: Duplex Doppler ultrasound vs. Arteriography (NASCET method). Primary outcome: Detection of ≥70% carotid stenosis.

What does this research mean for the field?

Duplex Doppler ultrasound can reliably detect ≥70% carotid stenosis as defined by NASCET, with a peak systolic velocity in the internal carotid artery >210 cm/s yielding 94% sensitivity and 77% specificity. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To establish and validate duplex Doppler ultrasound velocity thresholds for identifying carotid artery stenosis of 70% or greater, matching the criteria used in the North American Symptomatic Carotid Endarterectomy Trial.

April 1, 1996Stroke

Determination of Duplex Doppler Ultrasound Criteria Appropriate to the North American Symptomatic Carotid Endarterectomy Trial

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Key result

Duplex Doppler ultrasound reliably detected ≥70% carotid stenosis, with PSV ICA >210 cm/s yielding 94% sensitivity and 77% specificity compared to arteriography.

Why the study?

Does duplex Doppler ultrasound accurately detect >=70% carotid stenosis compared to NASCET arteriography in patients undergoing carotid evaluation?

Key Points

To establish and validate duplex Doppler ultrasound velocity thresholds for identifying carotid artery stenosis of 70% or greater, matching the criteria used in the North American Symptomatic Carotid Endarterectomy Trial.
Reviewed duplex scans and arteriograms of 110 patients (210 carotid arteries) performed within 1 month of each other, interpreted by blinded readers.
Quantified arteriographic stenosis via the trial standard method and recorded duplex peak systolic velocity (PSV), end-diastolic velocity (EDV), and internal-to-common carotid artery (ICA/CCA) ratios.
Generated receiver-operator characteristic curves to calculate sensitivity, specificity, positive predictive value, negative predictive value, and overall diagnostic accuracy.
Interobserver agreement for measurement of arteriographic stenosis was high, with a kappa value of 0.86.
An internal carotid artery PSV greater than 210 cm/s identified 70% or greater stenosis with 94% sensitivity, 77% specificity, 68% PPV, 96% NPV, and 83% accuracy.
An ICA/CCA PSV ratio greater than 3.0 yielded 91% sensitivity, 78% specificity, and 83% accuracy, while an EDV ratio greater than 3.3 achieved 100% sensitivity, 65% specificity, and 79% accuracy.

Study Design

Type

Cross-Sectional (n=110)

Blinding

Blinded readers

Structured PICO

Does duplex Doppler ultrasound accurately detect >=70% carotid stenosis compared to NASCET arteriography in patients undergoing carotid evaluation?

Population

110 patients (210 carotids) who underwent duplex scan and arteriograms within 1 month of each other to evaluate criteria for ≥70% carotid stenosis.

Exposure

Duplex Doppler ultrasound (measuring peak systolic and end-diastolic velocity [PSV, EDV] and ratios)

Comparator

Arteriographic stenosis determined by the NASCET method

Outcome

Diagnostic accuracy (sensitivity, specificity, PPV, NPV, accuracy) for detecting >=70% carotid stenosissurrogate

Duplex Doppler ultrasound criteria, specifically PSVICA >210 cm/s, can reliably identify >=70% carotid stenosis corresponding to the NASCET arteriographic method.

Limitations

Individual vascular laboratories must validate their own results.

Authors

JCJeffrey P. CarpenterMiddlebury College FLFrank J. LexaAmerican College of Radiology JDJulia T. DavisPenn State Milton S. Hershey Medical Center

Discussion

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Implication

Supports duplex screening for ≥70% stenosis; leaves open prospective outcome validation before guiding intervention.

Cite This Study

Carpenter et al. (1996) conducted a cross-sectional in Carotid stenosis (n=110). Duplex Doppler ultrasound vs. Arteriography (NASCET method) was evaluated on Detection of ≥70% carotid stenosis. Duplex Doppler ultrasound reliably detected ≥70% carotid stenosis, with PSV ICA >210 cm/s yielding 94% sensitivity and 77% specificity compared to arteriography.

synapsesocial.com/papers/6a1ec1616b4935698da448b2 https://doi.org/10.1161/01.str.27.4.695

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