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14 Cards in this Set

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What does the number 2 represent in doppler equation?
That there are 2 doppler shifts
What angle is not reliable in doppler?
>60 degrees
What arteries do you evaluate with lower extremity doppler?
Distal external iliac, common femoral, CFA bifurcation, SFA Prox-Dist, Popliteal artery, trifurcation
If a >50% stenosis is suspected what do you obtain?
Pre stenotic PSV, PSV in stenosis and post stenotic turbulence
What type of lower extremity grafts are there?
Reversed Saphenous Vein Graft and In-Situ Vein Graft
Explain Reversed Saphenous Vein Graft
Small end is proximal
Large end is distal
Vein valves stay open due to arterial flow pressure
Branches are ligated
Explain In Situ Graft
GSV stays in place
Small end is distal
Large end is proximal
Prior to surgery valves are broken up with special instrument
Branches ligated
A 2:1 ratio in PSV equals how much of a diameter reduction?
>50% diameter reduction
A 4:1 ratio in PSV equals how much of a diameter reduction?
>75%
How much of a reduction is present with a PSV of greater than 400 cm/sec?
>75% diameter reduction
In a normal bypass graft is some retrograde flow normal?
Yes, it may be evident at the distal anastamosis of an RSVG
How much of a PSV decrease in a graft is abnormal?
30 cm/sec
Is a change from triphasic to biphasic in a graft normal?
No
In a graft a decrease of ABI of how much is abnormal?
>.15