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13 Cards in this Set
- Front
- Back
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How is DTPA excreted? |
By the kidney via GFR filtration (neither secretion nor absorption) |
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List 4 indications for use of DTPA. |
1. Determine GFRs 2. Determine functional of contralateral kidney 3. Rule out obstructive uropathies 4. Evaluate morphology |
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What are the routes of administration and acquisition modes for DTPA? |
IV Frame mode - Dynamic |
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How should the patient be positioned and what is the image timing for DTPA studies? |
Left lateral (camera dorsal to kidneys, then lateral for depth correction) Image immediately post injection |
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When should peak renal activity be seen in normal patients? |
~3 minutes |
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What is the percentage of its first pass extraction? |
20% (fast blood clearance) |
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What is the normal GFR value for dogs and cats respectively? |
Dogs > 3mL/min/kg Cats > 2.5mL/min/kg |
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What must GFR values be below in order to see azotemia on bloodwork? |
< 1mL/min/kg |
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If renal blood flow (RBF) is reduced, how may the body adapt in order to maintain an acceptable GFR? |
Vasoconstriction of the efferent arteriole. |
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What is average renal plasma flow? |
15 mL/min/kg |
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List 4 reasons why imagine studies with DTPA are a superior clinical choice over plasma clearance studies. |
1. 2 minutes of data (instead of 3 hours) 2. Can determine individual kidney GFRs 3. Can detect renal dysfunction before azotemia 4. It's just easier |
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For what species is depth attenuation correction important when calculating GFR? |
Dog |
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What is the equation used to correct for background activity in order to determine true net kidney counts? |
net kidney counts = gross counts kidney ROI - [(# pixels in kidney ROI)*(BKGRND counts/BKGRND pixels)]
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