Nephrocalcinosis in preterm infants: a single center experience

Area of Science:

• Neonatal Medicine
• Pediatric Nephrology
• Medical Imaging

Background:

• Nephrocalcinosis poses a significant risk to preterm infants, with reported incidence rates varying widely.
• Furosemide-induced hypercalciuria is frequently cited as a primary risk factor for this condition.

Purpose of the Study:

• To retrospectively investigate the incidence, etiological factors, and clinical outcomes of nephrocalcinosis in preterm infants.
• To analyze trends in nephrocalcinosis and related renal abnormalities over a decade (1988-1998).

Main Methods:

• Retrospective analysis of 2190 preterm infants born between 1988 and 1998.
• Assessment of renal echogenicity and diagnosis of nephrocalcinosis using ultrasound.
• Identification of risk factors including gestational age, birth weight, and laboratory parameters.

Main Results:

• Nephrocalcinosis or abnormal renal echogenicity was observed in 31 infants (29.7 weeks gestational age; 1307 g birth weight).
• Overall incidence of nephrocalcinosis was 0.73% (1.7% in very low birth weight infants), increasing to 7% by 1998.
• Key risk factors identified: low gestational age, low birth weight, prolonged hospitalization, acid-base variations, and hypercalciuria.

Conclusions:

• The incidence of nephrocalcinosis in this cohort was lower than previously reported but showed an increasing trend.
• Persisting renal abnormalities were noted in a significant proportion of infants during follow-up.
• Long-term monitoring of preterm infants is crucial for managing potential late-onset complications of nephrocalcinosis.