## What is normal CCA velocity?

Normal flow in the CCA is usually greater than 45 cm/sec. High flow (>135 cm/sec) in both CCAs may be due to high cardiac output in hypertensive patients or young athletes.

What should the ICA CCA ratio be?

Table 1. Society of Radiologists in Ultrasound Consensus Criteria for Carotid Stenosis 23

Primary parameters Secondary parameters
Degree of stenosis, % ICA PSV, cm/sec ICA/CCA PSV ratio
Normal <125 <2.0
<50 <125 <2.0
50-69 125-230 2.0-4.0

What is prox CCA?

Proximal common carotid artery (prox. CCA)

### How do I calculate ICA CCA ratio?

The ICA/CCA PSV ratio was calculated by dividing the PSV of the ICA, which was selected for analysis by the PSV of the CCA. Specific recordings were also taken proximal to the stenosis, at the stenosis site, and immediately distal to the stenosis in the ICA, as seen on real-time imaging.

What is PSV and EDV?

PSV = peak systolic velocity. EDV = end diastolic velocity.

What is normal PSV?

The normal PSV in adults is 100–180 cm/sec, and the normal EDV is 25–50 cm/sec (,29).

## What is normal blood velocity?

Normal human peak systolic blood flow velocities vary with age, cardiac output, and anatomic site. At the aortic valve, peak velocities of up to 500 cm/sec may be possible. The ascending aorta has the highest average peak velocities of the major vessels; typical values are 150-175 cm/sec.

What is normal blood flow velocity?

Are there universally accepted ECA duplex velocity criteria?

Universally accepted ECA duplex velocity criteria, for the prediction of stenosis, do not exist. Methods: Consecutive patients undergoing angiography and carotid duplex assessments were compared (n = 140). ICA, common carotid artery (CCA), and ECA peak systolic velocities (PSVs) were recorded.

### What is the systolic velocity ratio of the CCA?

For example, for a patient with right CCA PSV 170 cm/s and left CCA PSV 90 cm/s, the ratio would be 1.88. If that patient has 40% stenosis on the right CCA and 20% on the left, the differential stenosis would be +20%, indicating ipsilateral stenosis.

What is the inter-CCA PSV ratio for carotid artery?

The CCA spectral waveform was considered dampened in the presence of low overall PSV and slower rise to peak systole compared with the contralateral CCA waveform.11 Inter-CCA PSV ratio was defined as the ratio between the side with higher PSV and the contralateral side with lower PSV; thus, all the ratios calculated would be ≥1.

What should the ECA / CCA PSV ratio be?

An ECA/CCA PSV ratio of 1.45 demonstrated a sensitivity of 73.7%, specificity of 66.7%, and an accuracy of 68.2%.In patients with ICA stenosis ≥50%, for the detection of ECA stenosis of ≥50%, an ECA PSV >179 cm/sec provided a sensitivity of 50%, specificity of 79.6%, and overall accuracy of 71.3%.

What is normal CCA velocity? Normal flow in the CCA is usually greater than 45 cm/sec. High flow (>135 cm/sec) in both CCAs may be due to high cardiac output in hypertensive patients or young athletes. What should the ICA CCA ratio be? Table 1. Society of Radiologists in Ultrasound Consensus Criteria for Carotid Stenosis…