black
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42. A 4-year-old boy is being evaluated for renal calculi. Urinalysis shows numerous hexagonally shaped crystals. Urine concentrations of several amino acids, including ornithine, arginine, and lysine, are increased. Which of the following is the most likely predominant component of the crystals?
A. Calcium oxalate
B. Cholesterol
C. Cystine
D. Struvite
E. Uric acid
HELP!! does C qualify among the contenders?
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| Dragonfly
Forum Elite
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yes, all these amnio acids are basic, so they make the urine alkaline, and that can predispose to Sturvite.
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| study_ing
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dragonfly's talked abt the important stuff
just to add a little clue...hexagonal crystals---cystine
and while we're at it...
which crystals are
1. star shaped
2.look like the back of an envelope
3. look like coffin lids?
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| study_ing
Forum Fanatic
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1. uric cid
2. calcium oxalate
3. triple phosphate
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| Dragonfly
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great info study_ing 
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| mitty
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the answer is C.
Cystinuria a transport protien defect with increase in excretion of lysine,arginine ,cystine and ornithine; excess cystine precipitate as kidney stones;
Tx:acetazolamide.
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| young_doc
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doens't Acetazolamide alkalize the urine (by retaining all that bicarb in the urine)?
how is that the treatment? i would think that it would only make it worst. anyone know the mechanism?
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| young_doc
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although important to remember COLA with Cysteinuria...BLACK be sure to google search for PICS of these stones. I have heard of such pics being on the board. So make sure you what they look like (and hence WHY we call them "envlope or coffin-lid shape)...
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