Evaluation of proximal tubular function in preterm infants by urinary α1‐microglobulin

HIROKAZU TSUKAHARA, MASAHIRO HIRAOKA, MASANORI KURIYAMA, SHINICHI HARUKI, KATSUJI NAKAMURA, FUMIHIKO SUEHIRO, MASAKATSU SUDO

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Abstract

α 1‐Microglobulin is a low molecular weight protein that is relatively stable in urine of low pH. There have been few reports on urinary α1‐microglobulin (U‐A1M) excretion in preterm infants. This study was designed to establish the ranges for U‐A1M in clinically stable preterm infants and to investigate changes observed in sick preterm infants. We measured U‐A1M and urinary β2‐microglobulin (U‐B2M) levels at 1, 4, 7, 14, 28 and 90 days after birth in stable preterm infants (Group 1) and sick preterm infants who were depressed at birth and required immediate resuscitation (Group 2). In Group 1 infants, both parameters were high during the first 28 days and appeared to decline thereafter. U‐A1M in Group 2 infants was only significantly increased compared with Group 1 on day 1, as was U‐B2M. On each day of the study, U‐A1M had significant positive correlations with U‐B2M for all the infants studied. The changes of the two parameters observed in Group 1 probably reflect postnatal evolution of proximal tubular function in stable preterm infants. A comparison of groups 1 and 2 shows a high prevalence of acute tubular injury at birth in sick infants and also suggests that U‐A1M as well as U‐B2M may be a sensitive index for detecting acute tubular damage and for following its course in preterm infants. 1993 Japan Pediatric Society

Original languageEnglish
Pages (from-to)127-129
Number of pages3
JournalPediatrics International
Volume35
Issue number2
DOIs
Publication statusPublished - Apr 1993

Keywords

  • preterm infants
  • renal proximal tubular function
  • urinary α‐microglobulin
  • urinary β‐microglobulin

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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    TSUKAHARA, HIROKAZU., HIRAOKA, MASAHIRO., KURIYAMA, MASANORI., HARUKI, SHINICHI., NAKAMURA, KATSUJI., SUEHIRO, FUMIHIKO., & SUDO, MASAKATSU. (1993). Evaluation of proximal tubular function in preterm infants by urinary α1‐microglobulin. Pediatrics International, 35(2), 127-129. https://doi.org/10.1111/j.1442-200X.1993.tb03022.x