The effect of long-term, non-suppressive levothyroxine treatment on quantitative ultrasonometry of bone in women.

Abstract:

OBJECTIVE:To evaluate the impact of long-term, non-suppressive levothyroxine (L-T(4)) treatment on quantitative ultrasonometry in women. DESIGN:This was a case-control study. SUBJECTS AND METHODS:Altogether 667 women (mean age+/-s.d., 49.5+/-13.1 years) were studied. Of these, 156 (23%) had non-toxic goitre or hypothyroidism and had been taking L-T(4) (75-100 microg/day) for at least 5 years (mean+/-s.d., 12.5+/-7.5 years); the remaining 511 (77%) women were not receiving L-T(4). All women had completed a questionnaire on risk factors for thyroid dysfunction and osteoporosis, and those with diseases or treatments known to effect bone metabolism - other than thyroxine or hormone replacement therapy (HRT) - were excluded. Women underwent quantitative ultrasonometry (QUS) at the heel. Speed of sound (SOS), broadband ultrasound attenuation (BUA) and the stiffness index (SI) were compared, first, in all women taking L-T(4) and controls and, secondly, in women taking L-T(4) and controls pair-matched for age, weight, body mass index (BMI), menopausal status and HRT use. RESULTS:Even after matching for age, weight, BMI, menopausal and HRT status, women taking L-T(4) had significantly lower values for SOS and SI (P<0.05), but not for BUA. However, absolute T- and Z-scores for SI were not low in either the study or control groups. Lower values were associated, but not significantly so, with years since the menopause and duration of L-T(4) treatment. CONCLUSIONS:Long-term, non-suppressive L-T(4) treatment in women with goitre or hypothyroidism was associated with a slight reduction in QUS values, which was more pronounced in postmenopausal women. This group could be at higher risk for osteoporotic fracture.

journal_name

Eur J Endocrinol

authors

Hadji P,Hars O,Sturm G,Bauer T,Emons G,Schulz KD

doi

10.1530/eje.0.1420445

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

445-50

issue

5

eissn

0804-4643

issn

1479-683X

pii

1420445

journal_volume

142

pub_type

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