概述,一、定义和分类。骨质疏松症(osteoporosis)是一种以骨量低下、骨组织微结构损坏,导致骨脆性增加、易发生骨折为特征的全身性骨病[1]。2001年美国国立卫生研究院(National Institutes of Health,NIH)将其定义为骨强度下降和骨折风...
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概述,一、定义和分类。骨质疏松症(osteoporosis)是一种以骨量低下、骨组织微结构损坏,导致骨脆性增加、易发生骨折为特征的全身性骨病[1]。2001年美国国立卫生研究院(National Institutes of Health,NIH)将其定义为骨强度下降和骨折风险增加为特征的骨骼疾病[2]。骨质疏松症可发生于任何年龄,但多见于绝经后女性和老年男性。依据病因,骨质疏松症分为原发性和继发性两大类。原发性骨质疏松症包括绝经后骨质疏松症(Ⅰ型)、老年骨质疏松症(Ⅱ型)和特发性骨质疏松症(青少年型)。绝经后骨质疏松症一般发生在女性绝经后5~10年内;老年骨质疏松症一般指70岁以后发生的骨质疏松;特发性骨质疏松症主要发生在青少年,病因尚未明确[3,4]。继发性骨质疏松症指由影响骨代谢的疾病或药物或其他原因导致的骨质疏松。
Objective To investigate the effects of substitutive and suppressive doses of levothyroxine on bone metabolism in patients with differentiated thyroid carcinoma after surgery and 131I ablation. Methods The patients, w...
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Objective To investigate the effects of substitutive and suppressive doses of levothyroxine on bone metabolism in patients with differentiated thyroid carcinoma after surgery and 131I ablation. Methods The patients, who had received levothyroxine(L-T4) for at least 3 years for treating their differentiated thyroid carcinoma after surgery and 131I therapy, were classified into substitutive group and suppressive group according to the levels of serum free triiodothyronine (FT3), free thyroxine (FT4), thyroid-stimulating hormone (TSH). We compared the levels of FT3, FT4, TSH, serum parathyroid hormone (PTH), serum calcium (Ca), serum phosphate (P), serum alkaline phosphates (ALP) and Bone mineral density (BMD) to those of healthy volunteers well matched for sex, age, menopausal status, and body mass index (BMI). Results No significant differences were found in the bone density and biochemical parameters of bone metabolism of the subjects treated with substitutive or suppressive doses of L-T4 compared with the control subgroup. No significant differences were observed among the subgroups according to accumulative doses of 131I. No bone fracture was found in all the patients. Conclusion The substitutive and suppressive doses of L-T4 are safe and necessary for patients with differentiated thyroid carcinoma after surgery and 131I therapy. Such treatment for 3 years is not associated with increased risk of osteoporosis. Much longer term of follow up is still needed in patients receiving substitutive and suppressive doses of L-T4.
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