Abstract
Urinary calculi found in 4 patients on chronic hemodialysis or continuous ambulatory peritoneal dialysis (CAPD) were identified as protein calculi by infrared spectroscopic analysis. Positive Congo red staining and immunological assessment revealed that the calculi were composed of amyloid protein derived from beta 2-microglobulin. A comparison of the patients who excreted calculi with 10 patients on chronic dialysis without urinary calculi showed no significant differences in the urinary and serum levels of beta 2-microglobulin. The mechanism of amyloid calculus formation may involve factors independent of the concentration of beta 2-microglobulin in urine or serum. Urinary calculi found in patients on chronic hemodialysis or CAPD were composed of amyloid protein derived from beta 2-microglobulin.
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