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I. Litmanovitz, T. Dolfin, R. Regev, S. Arnon, O. Friedland, R. Shainkin-Kestenbaum, M. Lis, A. Eliakim
Bone turnover markers and bone strength during the first weeks of life in very low birth weight premature infants
Objective: To determine the association between changes in bone turnover markers and bone strength of very low birth weight infants during the first eight postnatal weeks. Study design: Twelve very low birth weight premature infants [mean gestational age: 28.4+-0.6 weeks, mean birth weight: 1131+-62 grams] participated in the study. Bone strength was evaluated weekly by quantitative ultrasound measurements of tibial bone speed of sound (SOS, Sunlight Omnisense?). Bone specific alkaline phosphatase (BSAP), a marker of bone formation, and carboxy terminal cross-links telopeptide of type-I collagen (ICTP), a marker of bone resorption, were collected at the ages of one, four and eight weeks. Results: BSAP increased significantly (from 119.9+-16.2 U/L to 132.1+-11.9 U/L and 152.1+-15.7 U/L at one, four and eight weeks of life, respectively, p<0.05). ICTP decreased significantly during the study period (from 122.3+-8.7 ng/ml to 96.0+-4.8 ng/ml and 92.3+-5.4 ng/ml at one, four and eight weeks of life, respectively; p<0.05). There was a significant decrease in bone SOS (from 2886+-29 m/sec to 2792+-30 m/sec and 2753+-30 m/sec at birth, four weeks and eight weeks of life, respectively; p<0.02). There was no correlation between the levels of bone markers and bone SOS. Conclusion: In VLBW premature infants, there is a significant decrease in bone strength concomitant with biochemical evidence for new bone formation (increase in BSAP and a decrease in ICTP) during the first eight postnatal weeks. Changes in the biochemical markers could not predict the changes in bone strength.
Journal of Perinatal Medicine, Walter de Gruyter
Print ISSN: 1619-3997
Volume: 32, 02/2004
Pages: 58 - 61