Based on the University of Washington criteria, a peak systolic velocity > 125 cm/s and an end-diastolic velocity of 47 cm/s in an ICA are consistent with stenosis of:
a. ≥ 80 percent
b. ≥ 50 percent
c. <50 percent
d. ≥ 70 percent
Answer (2)
The problem provides PSV > 125 cm/s and EDV = 47 cm/s in the ICA.
According to University of Washington criteria, PSV > 125 cm/s suggests at least 50% stenosis.
EDV < 50 cm/s further refines the stenosis range to 50-69%.
Therefore, the stenosis is ≥ 50 percent .
Explanation
Understanding the Problem We are given a peak systolic velocity (PSV) > 125 cm/s and an end-diastolic velocity (EDV) of 47 cm/s in the internal carotid artery (ICA). We need to determine the degree of stenosis based on the University of Washington criteria.
Applying the Criteria According to the University of Washington criteria, the following ranges are generally observed:
Less than 50% stenosis: PSV < 125 cm/s
50-69% stenosis: PSV > 125 cm/s and EDV < 50 cm/s
70-99% stenosis: PSV > 125 cm/s and EDV > 50 cm/s
Near occlusion/occlusion: Very high PSV or absent flow
Determining Stenosis Range In our case, PSV > 125 cm/s and EDV = 47 cm/s. Comparing these values to the criteria, we see that the PSV is above 125 cm/s, which suggests at least 50% stenosis. The EDV is 47 cm/s, which is less than 50 cm/s. Therefore, the stenosis is in the range of 50-69%.
Final Answer Based on the analysis, the given PSV and EDV values are consistent with stenosis of ≥ 50 percent.
Examples
Carotid artery stenosis is a narrowing of the carotid arteries, which are major blood vessels in the neck that supply blood to the brain. Assessing the degree of stenosis using Doppler ultrasound, which measures blood flow velocities, helps doctors determine the risk of stroke. For instance, if a patient has a peak systolic velocity greater than 125 cm/s and an end-diastolic velocity of 47 cm/s, it suggests a stenosis of at least 50%, prompting further investigation and potential intervention to prevent a stroke. This diagnostic approach is crucial in managing cardiovascular health and preventing serious complications.
Based on the University of Washington criteria, a peak systolic velocity > 125 cm/s and an end-diastolic velocity of 47 cm/s indicate that the stenosis is consistent with at least 50% stenosis. Hence, the correct answer is option b. ≥ 50 percent .
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