Nephrolithiasis in premature infants.

Abstract
Clinical records of 10 premature infants with nephrolithiasis were reviewed. The probable mechanism of stone formation was hypercalciuria due to furosemide therapy (9 patients) and congenital hyperparathyroidism (1 patient). The relatively high rates of urinary Ca excretion from immature kidneys predisposed these neonates to the development of Ca stones. Renal calculi in neonates are complications of distinct, treatable conditions and premature babies receiving furosemide treatment shoudl be screened by ultrasonography for renal calcifications.

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