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Impaired kidney growth in low-birth-weight children: distinct effects of maturity and weight for gestational age.

Abstract：

BACKGROUND:Low birth weight is an important risk factor for hypertension and unfavorable prognoses of a number of renal diseases. It is also associated with reduced kidney size and nephron number. A differentiation between the effects of low birth weight versus being born premature or small for gestational age has, however, not been addressed. METHODS:The influence of weight for gestational age (percentage deviation from expected mean), gestational age, birth weight, and early diet on kidney growth was studied in 178 children born pre- or postmature and/or small or large for gestational age, comparing them to 717 mature children, birth weight appropriate for gestational age. Kidney size was determined by bilateral ultrasonography measuring length, width and depth, using the equation of an ellipsoid for volume calculation. The examinations were performed at 0, 3, and 18 months of age together with measurements of body weight, height, and skinfold thickness. RESULTS:Weight for gestational age had a significant, positive effect on combined kidney volume at all three ages (0 months, P < 0.001; 3 months, P < 0.001; and 18 months, P < 0.001). A slight catch-up growth in kidney size was seen in the most growth-retarded infants (<10th percentile) between 0 and 18 months of age (mean Deltaz score(0-18 mo)=+0.22 SD) (P= 0.037). Premature children had smaller kidneys compared to mature at all ages (0 months, P= 0.001; 3 months, P= 0.007; and 18 months, P= 0.042), without any significant catch-up with age. Relative kidney volume was inversely correlated with weight for gestational age at birth (P= 0.007) but positively at 18 months (P= 0.008). Relative kidney growth 0 to 18 months was positively correlated to weight for gestational age (P= 0.013). Low birth weight was associated with impaired relative kidney growth in response to formula feeding. CONCLUSION:Being small for gestational age is associated with small kidneys at birth and impaired kidney growth in early childhood. The present data suggest that intrauterine growth has a regulatory influence on nephron formation and renal function in humans reaching beyond the neonatal period.

journal_name

Kidney Int

journal_title

Kidney international

authors

Schmidt IM,Chellakooty M,Boisen KA,Damgaard IN,Mau Kai C,Olgaard K,Main KM

doi

10.1111/j.1523-1755.2005.00451.x

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

731-40

issue

2

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)50893-4

journal_volume

68

pub_type

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