Ultrasonic assessment of calcaneus in inhabitants in a cadmium-polluted area.
We used ultrasound (US) transmission to evaluate the speed of sound (SOS) and broadband ultrasonic attenuation (BUA) in the calcaneus in 17 male and 18 female inhabitants of a Cd-polluted area and 23 men and 45 women living in a nonpolluted area. Significant decreases in SOS and stiffness (Stiff), which was an index empirically derived from SOS and BUA, were found in Cd-exposed women. To evaluate the usefulness of the US measurements for detecting bone abnormality in Cd-exposed people, we examined the associations with the bone measurements of metacarpus by the previously used microdensitometry (MD) method and the grade of renal tubular damage due to Cd exposure. Bone density estimated by MD, sigmaGS/D, was significantly correlated with BUA, SOS, and Stiff in the Cd-exposed men and with BUA and Stiff in the Cd-exposed women. Further, in the Cd-exposed women, the decreases in BUA and Stiff correlated significantly with the increases in urinary beta 2-microglobulin, while sigmaGS/D by the MD method did not. These results suggest that the measurement of the calcaneus using US is not only radiation free but also can be used as a tool for population surveys aiming to evaluate bone damage in people, especially women, showing renal tubular damage due to environmental Cd exposure.
Tsuritani
I
I
Department of Hygiene, Kanazawa Medical University, Uchinada, Ishikawa, Japan.
Honda
R
R
Ishizaki
M
M
Yamada
Y
Y
Nishijo
M
M
D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density / Q000187:drug effects; D002104:Cadmium / Q000009:adverse effects* / Q000652:urine; D002105:Cadmium Poisoning / Q000000981:diagnostic imaging*; D002111:Calcaneus / Q000000981:diagnostic imaging* / Q000187:drug effects; D015331:Cohort Studies; D003720:Densitometry; D004781:Environmental Exposure / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007677:Kidney Function Tests; D007684:Kidney Tubules / Q000000981:diagnostic imaging / Q000187:drug effects; D008297:Male; D008663:Metacarpus / Q000000981:diagnostic imaging / Q000187:drug effects; D008875:Middle Aged; D012989:Soil Pollutants; D013054:Spectrophotometry, Atomic; D014463:Ultrasonography; D001613:beta 2-Microglobulin / Q000652:urine
D012989:Soil Pollutants; D001613:beta 2-Microglobulin; D002104:Cadmium