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• W2035587062 abstract "The effects of pregnancy on bone turnover and the potential risk of developing an osteoporotic fracture in pregnancy are controversial. Utilizing biochemical markers of bone formation and resorption and dual-energy X-ray absorptiometry (DEXA), bone turnover before, during, and after pregnancy was studied in detail. Ten women (mean age 30 years; range 23-40) were recruited. Prepregnancy data were obtained and then a review was performed at 2-week intervals , once pregnancy was confirmed, until 14 weeks of gestation and thereafter monthly until term. Bone mineral density (BMD) was estimated by DEXA scanning of hip, spine, and forearm preconception and postpartum. In addition, BMD of the forearm at 14 weeks and 28 weeks gestation was obtained. All pregnancies had a successful outcome. Urinary free pyridinium cross-links, free pyridinoline (fPyr) and free deoxypyridinoline (fDPyr), were normal prepregnancy (mean [+/-SD]) 14.6 nmol/mmol (1.8) and 5.0 nmol/mmol (1.0) creat, respectively. By 14 weeks, they had increased to 20.8 nmol/mmol (4.3) and 6.1 nmol mmol (1.4) (both p < 0.02) and by 28 weeks to 26.3 nmol/mmol (5.6) and 7.4 nmol/mmol (1.6) (both p < 0.01). The ratio of fPyr to fDPyr remained constant. A similar significant increase was observed in N-telopeptide (NTx). Bone formation was assessed by measurement of carboxyterminal propeptide of type 1 collagen (P1CP) and bone-specific alkaline phosphatase (BSAP). Neither were altered significantly before 28 weeks, but subsequently mean P1CP increased from 110 microg/liter (23) to 235 microg/liter (84) at 38 weeks and mean BSAP increased from 11.1 U/liter (5.0) to 28.6 U/liter (11.1) (p < 0.01 for both variables). Lumbar spine (L1-L4) BMD decreased from a prepregnancy mean of 1.075 g/cm (0.115) to 1.054 g/cm2 (0.150) postpartum (p < 0.05). Total hip BMD decreased from a prepregnancy mean of 0.976 g/cm2 (0.089) to 0.941 g/cm2 (0.097) (p < 0.05). Forearm BMD at midradius, one-third distal and ultradistal decreased but did not reach statistical significance. As assessed by these bone markers, in the first 2 trimesters of pregnancy, bone remodeling is uncoupled with a marked increase in bone resorption. A corresponding increase in formation markers is not observed until the third trimester. Spinal BMD exhibits a significant decrease from prepregnancy to the immediate postpartum period with a mean reduction in BMD of 3.5 % in 9 months." @default.
• W2035587062 created "2016-06-24" @default.
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• W2035587062 date "2000-03-01" @default.
• W2035587062 modified "2023-10-14" @default.
• W2035587062 title "A Detailed Assessment of Alterations in Bone Turnover, Calcium Homeostasis, and Bone Density in Normal Pregnancy" @default.
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• W2035587062 doi "https://doi.org/10.1359/jbmr.2000.15.3.557" @default.
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