Given an ICA waveform with a peak systolic velocity of 285 cm/sec and an end-diastolic velocity of 66 cm/sec, which statement is TRUE?

The statement that these velocities suggest severe ICA stenosis greater than 50% is true based on the peak systolic and end-diastolic velocities provided. In vascular ultrasound, particularly in the assessment of the internal carotid artery (ICA), peak systolic velocity (PSV) and end-diastolic velocity (EDV) are critical parameters for diagnosing stenosis.

When the peak systolic velocity is above 230 cm/sec, it is indicative of a significant degree of stenosis, with greater than 50% narrowing of the artery. A PSV of 285 cm/sec is notably high and aligns with severe stenosis. Additionally, an end-diastolic velocity of 66 cm/sec reinforces this assessment, as end-diastolic velocities can also provide information on the severity of the stenosis. A higher EDV typically suggests more significant disease as well, particularly when correlated with a high PSV.

In this context, the other statements do not accurately represent the relationship between the provided velocities and ICA stenosis. Diastolic flow in this case does not indicate normal ICA function due to the elevated velocities, which generally suggest pathology. A filled systolic window would typically indicate higher turbulence, which contradicts the assertion that there is low turbulence. Lastly