Effect of repeated occupational exposure to lead, cessation of exposure, and chelation on levels of lead in bone.

Abstract:

:A sensitive K-X-ray fluorescence (K-XRF) instrument was used to measure lead levels in the tibia and patella on a series of twelve subjects who had relatively well-documented histories of lead exposure and blood lead levels. For some subjects, K-XRF measurements were taken at multiple points in time, and before and after chelation with EDTA (ethylenediamine tetraacetic acid). Results confirm that K-XRF measured bone lead levels correspond to cumulative blood lead indices and not to current blood lead levels. Moreover, the data suggest that bone lead levels; (1) correspond to urinary lead following the EDTA mobilization test unless previous chelation has occurred; (2) rise initially after lead exposure ceases and blood lead levels decrease, probably from redistribution from soft tissue, and then fall; and (3) do not decrease with a 3- to 5-day course of therapeutic EDTA chelation. K-XRF levels in the patella were noted to decrease more rapidly than levels in the tibia after cessation of lead exposure, a finding that probably reflects the greater turnover of lead in trabecular bone than in cortical bone.

journal_name

Am J Ind Med

authors

Hu H,Pepper L,Goldman R

doi

10.1002/ajim.4700200603

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

723-35

issue

6

eissn

0271-3586

issn

1097-0274

journal_volume

20

pub_type

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