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