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15 Cards in this Set
- Front
- Back
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What are the capabilities of duplex/ color flow imaging?
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Localize stenosis/ occlusion
Determine presence/ absence of aneurysm Post op study of hemodialysis access or arterial bypass graft Detect AVF's |
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Sample size of pulsed doppler is usually?
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1-1.5 mm and increased as needed
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Is it common for upper extremity arteries to become stenosed?
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No, main use is evaluation of dialysis access grafts
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Is it normal or abnormal to hear a thrill at a hemodialysis access site?
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Normal. You can hear it at a patent site as well as a stenotic one.
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How do you evaluate a dialysis access graft?
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Inflow artery
Arterial anastomosis Continue through body of arch Venous anastomosis Outflow vein |
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Examples of dialysis access grafts include?
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Brescia-Cimino fistula, straight, lopped synthetic grafts
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Why is there no current criteria for evaluated stenosis in upper extremity?
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Normal PSV vary widelyn with skin temperature changes
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If a a >50% reduction is present, what do you do?
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Observe for stenosis profile
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What should you see if you have an occlusion of upper extremity?
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Observe for lack of doppler signals and the proverbial thump which is obtained proximal to occlusion
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What type of aneurysm can be formed by using palm of hand as a hammer?
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Ulnar artery aneurysm
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PSV and EDV vary as to the type of access but normally both are?
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Elevated
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Low PSV's obtained in access graft could indicate?
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Arterial INFLOW problems
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What are the most common sites for stenosis in a hemodialysis access?
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Venous anastomosis and outflow vein are most common
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What is a Steal syndrome?
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Distal arterial blood is reversed into lower resistant venous circulation
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What symptoms can a steal syndrome cause?
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Pain on exertion, pallor and coolness distal to shunt.
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