Renal Developmental Delay Expressed by Reduced Glomerular Number and Its Association with Growth Retardation in Victims of Sudden Infant Death Syndrome and in “Normal” Infants |
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Authors: | Darren J Beech Paul D Sibbons C Vyvyan Howard Dick van Velzen |
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Institution: | (1) Fetal and Infant Toxico-Pathology, The University of Liverpool, Mulberry Street, Liverpool, L69 7ZA, UK, GB;(2) Department of Surgical Research, Northwick Park Institute for Medical Research, Northwick Park Hospital, Harrow, HA1 3UJ, UK, GB;(3) Department of Pathology, Westeinde Zienkenhuis, Lijnbaan 32, Postbus 432, 2501 CK Den Haag, The Netherlands, NL |
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Abstract: | In victims of sudden infant death syndrome (SIDS), renal development has been reported to be significantly impaired. In the
present study, we used stereological techniques to estimate volume of kidney cortex and total number of glomeruli in a group
of human infants. Infants were classified according to cause of death—SIDS or non-SIDS. Cases were further subdivided according
to birth weight—normal birth weight (NBW) or low birth weight (LBW) (we were unable to identify any non-SIDS LBW infants for
our study). No significant differences were found between NBW and LBW infants (irrespective of cause of death) for cortical
volume, glomerular density, or total glomerular number (p > 0.140). Kidney cortical volume, glomerular density, and total glomerular number were not significantly different between SIDS and
non-SIDS infants (p > 0.510). Glomerular number was only significantly less in SIDS infants of LBW (p = 0.032) than in controls according to the Wilcoxon rank sum test; using the Kruskal-Wallis for one-way analysis, no significant difference
was found (p > 0.010). These results contrast with those from previous studies, as a reduction in glomerular number was not noted in SIDS NBW infants,
and the mean value for the control (non-SIDS NBW) group was significantly reduced (p < 0.01) from those of previous studies. This indicates that glomerular number reduction is seen in SIDS NBW and non-SIDS NBW cases
and is therefore directly associated with growth retardation rather than with SIDS.
Received May 24, 1999; accepted December 29, 1999. |
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Keywords: | : development glomeruli intrauterine growth retardation kidney stereology sudden infant death syndrome |
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