sonologists give a diameter narrowing as criteria for stenosis, some
give a combination of PSV and diameter.
collateral pathway in carotid artery stenosis
PSV is usually 0.2 to 0.5 m/s
diameter is usually not > than 4 mm, and not less than 2 mm.
resistance is suggestive of intrinsic vertebral aertery disease
to visualize a vertebral artery could indicate that the vessel is
occluded, but more often than not, it could be a false-positive
finding due to poor visualization / poor image quality.
from a stenosis of the subclavian artery proximal to the origin of
the vertebral artery. The main direct sign of the steal phenomenon
is reversed blood flow in the ipsilateral vertebral artery.
Stenosis, plaques, hemodynamic
flow disturbances can be graded accurately and non-invasively by
with inputs from
Dr. Rahul Sachdev (Delhi), Dr.
Alpana Joshi (Mumbai), Dr. Sanjeev Mani (Mumbai)
be Concluded…..Troubleshooting Tips in Carotid Doppler