ANATOMY
EXTRACRANIAL HEAD AND NECK
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Highes ICA / Proximal CCA
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Highest ICA / Highest CCA
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Highest ICA / Distal ECA
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Highest ICA / Distal CCA
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Detailed explanation-1: -Doppler velocity ratios for ICA/CCA are 0.4 to 0.7 for normal vessels910; in the assessment of carotid atheroma, a velocity ratio >1.5 is considered significant for stenosis >50%. In the development of CSI, we have adopted the ICA/CCA ratio of 1:1.2.
Detailed explanation-2: -Conclusion: The PSVICA/CCA ratio can be used for detecting internal carotid artery angiographic stenosis. PSVICA/CCA ratios of 1.2, 1.8, and 2.2 are proper criteria for interpreting 50%≤, 60%≤ and 70%≤ stenosis, respectively.
Detailed explanation-3: -High-grade (80% to 99% diameter reduction) asymptomatic internal carotid artery stenoses are associated with an increased neurologic event rate (transient ischemic attack, stroke, asymptomatic internal carotid artery occlusion) compared to less severe asymptomatic lesions.
Detailed explanation-4: -normal. ICA PSV is <125 cm/sec and no plaque or intimal thickening is visible sonographically. additional criteria include ICA/CCA PSV ratio <2.0 and ICA EDV <40 cm/sec.