Journal of Clinical Endocrinology & Metabolism, Vol 60, 109-113, Copyright © 1985 by Endocrine Society

ARTICLES

Multifactorial low remodeling bone disease during cyclic total parenteral nutrition

MC de Vernejoul, B Messing, D Modrowski, J Bielakoff, A Buisine and L Miravet

The physiopathology of metabolic bone disease described during long term total parenteral nutrition is poorly understood. We therefore prospectively assessed bone status of seven adult patients [mean age, 42 +/- 16 (SD) yr] treated with cyclic total parenteral nutrition for a period of 7 +/- 2 (SD) months. All patients had hypercalciuria (381 +/- 96 mg/day) associated with negative calcium balance in six of seven patients (-49 +/- 120 mg/day). A correlation was found (r = +0.74, P less than 0.01) between protein intake and calciuria. Two patients developed slight transient hypercalcemia. Serum magnesium and phosphate levels remained within the normal range. A high aluminum load due to the added phosphate solution (253 +/- 84 micrograms/day) was associated with increased serum aluminum levels (52 +/- 38 micrograms/liter). Normal serum levels of 25 hydroxyvitamin D (12 +/- 7 ng/ml) and low normal 1,25 dihydroxyvitamin D levels (21 +/- 8 pg/ml) were found. Serum PTH was normal in five and increased in two of the seven patients. However, in these two patients skeletal unresponsiveness to the action of PTH was found. A new histomorphometric picture of bone was observed; it consisted of a markedly reduced bone formation with subnormal osteoclastic activity leading to a low trabecular bone volume. No osteomalacia was found. The aluminum load may have played a role in these bone defects. The hypercalciuria with negative calcium balance was attributed to the cyclic amino-acid delivery during TPN.

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