Paul L. Hofman, M.B., Ch.B., Fiona Regan, M.B., B.S., Wendy E. Jackson, M.B., Ch.B., Craig Jefferies, M.B., Ch.B., David B. Knight, M.B., B.S., Elizabeth M. Robinson, M.Sc., and Wayne S. Cutfield, M.D.
Background Term infants who are small for gestational age appearprone to the development of insulin resistance during childhood.We hypothesized that insulin resistance, a marker of type 2diabetes mellitus, would be prevalent among children who hadbeen born prematurely, irrespective of whether they were appropriatefor gestational age or small for gestational age.
Methods Seventy-two healthy prepubertal children 4 to 10 yearsof age were studied: 50 who had been born prematurely (32 weeks'gestation or less), including 38 with a birth weight that wasappropriate for gestational age (above the 10th percentile)and 12 with a birth weight that was low (i.e., who were small)for gestational age, and 22 control subjects (at least 37 weeks'gestation, with a birth weight above the 10th percentile). Insulinsensitivity was measured with the use of paired insulin andglucose data obtained by frequent measurements during intravenousglucose-tolerance tests.
Results Children who had been born prematurely, whether theirweight was appropriate or low for gestational age, had an isolatedreduction in insulin sensitivity as compared with controls (appropriate-for-gestational-agegroup, 14.2x104 per minute per milliunit per liter [95percent confidence interval, 11.5 to 16.2]; small-for-gestational-agegroup, 12.9x104 per minute per milliunit per liter [95percent confidence interval, 9.7 to 17.4]; and control group,21.6x104 per minute per milliunit per liter [95 percentconfidence interval, 17.1 to 27.4]; P=0.002). There were nosignificant differences in insulin sensitivity between the twopremature groups (P=0.80). As compared with controls, both groupsof premature children had a compensatory increase in acute insulinrelease (appropriate-for-gestational-age group, 2002 pmol perliter [95 percent confidence interval, 2153 to 2432]; small-for-gestational-agegroup, 2253 pmol per liter [95 percent confidence interval,1622 to 3128]; and control group, 1148 pmol per liter [95 percentconfidence interval, 875 to 1500]; P<0.001).
Conclusions Like children who were born at term but who weresmall for gestational age, children who were born prematurelyhave an isolated reduction in insulin sensitivity, which maybe a risk factor for type 2 diabetes mellitus.
Source Information
From the Liggins Institute (P.L.H., F.R., W.E.J., C.J., W.S.C.) and the Health Research Council Biostatistics Unit, Department of Community Health (E.M.R.), University of Auckland; and the National Women's Hospital Neonatal Unit (D.B.K.) both in Auckland, New Zealand.
Address reprint requests to Dr. Hofman at the Liggins Institute, Faculty of Medicine and Health Science, University of Auckland, Private Bag 92019, Auckland, New Zealand, or at p.hofman{at}auckland.ac.nz.
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