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15 Cards in this Set
- Front
- Back
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What are the indications for a diuresis renogram?
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To assess renal function and urodynamics, to determine what percent of total renal function is contributed to both of the kidneys, to diagnose or exclude urinary tract obstruction.
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What is the name of the diuretic that is most commonly used for this study? How much is administered via IV?
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Lasix (Furosemide), 20-40 mg
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What preparation is necessary for the patient prior to the study?
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Patient must be well hydrated, give about 5-10 ml/kg of water 30-60 minutes prior to injection. Patient should also void before injection and after study is complete.
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Any contraindications? If so, what are they?
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No iodine contrast studies within 24 hours of exam, dehydration, pregnancy, breast feeding, no diuretics prior, and patient movement.
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What kind of collimator is used?
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Low Energy, high resolution (LEHR), parallel hole
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How long after the injection should imaging begin?
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Immediately; some wait 10-15 minutes if dealing with patients with known obstruction.
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How long does a Diuresis Renogram study take to complete?
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30 minutes to 1 hour
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For how long should each image be obtained?
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2-3 seconds/frame for 1 minute (flow)
30-60 seconds/frame for 20-30 minutes (dynamics) 500 kcts-1 million cts (statics) |
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How many images should be in a data set?
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30 images (flow), 45-60 images for dynamics and statics
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What radiopharmaceutical is most commonly used for this study? What is the adult dose?
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Tc-99m - MAG3, 5-10 mCi
or Tc-99m - DTPA, 5-15 mCi |
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What is the mode of localization for Tc-99m - MAG3?
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Glomerular filtration
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At what view of the patient's body are imaged being obtained?
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Posterior
(Anterior images are optional for renal transplant patients) |
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At what position is the patient situated prior to the exam?
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Supine
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What are considered normal results for a diuresis renogram?
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Homogenous distribution of Rph in both kidneys, normal results with furosemide (T-1/2) washout time from injection is typically at <15 minutes; 15-20 minutes is indeterminate, Curves are declining and continue to do so after administration of diuretic.
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What are considered abnormal results for a diuresis renogram?
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False-positive results and equivocal interpretation may arise when a diseased kidney is not responsive to furosemide injection (such as w/ immature renal function in neonates, severe dehydration, and poor baseline renal function), and the collecting system is dilated, and VUR or fully distended bladder is present.
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