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What are the optimal ultrasound velocity criteria for detecting ≥50% and ≥70% carotid in-stent restenosis compared to angiography?
What are the optimal ultrasound velocity criteria for detecting ≥50% and ≥70% carotid in-stent restenosis compared to angiography?
Specific ultrasound velocity thresholds (PSV and ICA/CCA ratio) can be used to identify ≥50% and ≥70% carotid in-stent restenosis.
May refine noninvasive carotid ISR surveillance; leaves open prospective angiographic validation before practice change.
PSV and ICA/CCA ratio in ISR increased to a greater extent for angiographic stenosis > or =50%. PSV 240 cm/sec and ICA/CCA ratio 2.45 are optimal thresholds for > or =50% ISR, and PSV 450 cm/sec and ICA/CCA ratio 4.3 are optimal thresholds for > or =70% ISR.
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Chi et al. (2006) studied this question.
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