Xiaoyun Liu

Nanjing Medical University, Nanjing, Jiangsu Sheng, China

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Publications (3)4.41 Total impact

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    ABSTRACT: Abstract Objective: To investigate the changes in thyroid function and morphology in overweight and obese school-aged children and adolescents in Chinese population. Methods: Altogether, 880 children and adolescents were enrolled in a cross-sectional survey in Anhui Province and we assessed thyroid function, thyroid ultrasound, metabolic indicators and high-sensitivity C-reactive protein (hs-CRP) levels in 781 subjects, which were divided into obesity (n=327), overweight (n=242), and normal-weight (n=212) groups. Overweight and obese subjects were further divided into four subgroups according to thyroid peroxidase antibody and ultrasound pattern to compare thyroid function and morphology with or without thyroid autoimmune evidence. Results: Thyroid-stimulating hormone (TSH) and free 3,5,3'-triiodothyronine (FT3), as well as thyroid volume, were found to be positively associated with body mass index Z-score, waist/hip ratio, waist/height ratio and/or waist circumference (WC). Conversely, free thyroxine was negatively associated with WC. The detection rates of thyroid nodules among these groups were not significantly different (p=0.828). Among the four subgroups in 569 overweight or obese subjects, the changes in thyroid function and volume were more obvious in group D which showed no autoimmune evidence. The levels of hs-CRP were also higher in the overweight and obese groups with or without autoimmune evidence than in the normal-weight group (p<0.05). Conclusion: Thyroid function and morphology may be affected in obese and overweight children and adolescents with elevated TSH, FT3 and thyroid volume. The detection rates of thyroid nodules may not be affected by obesity. Alterations in thyroid function and morphology cannot be completely explained by local autoimmune responses. Low-grade inflammation may be involved in the changes in thyroid function and morphology in obesity.
    Journal of pediatric endocrinology & metabolism: JPEM 03/2013; · 0.75 Impact Factor
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    ABSTRACT: This study was performed to ascertain whether a relationship exists between thyroid function and blood pressure in school-aged Chinese subjects without overt thyroid disease. A cross-sectional survey of 880 subjects (541 females and 339 males) aged 7-18 years in Bengbu, Anhui province was conducted. The investigation, which was based on a stratified random cluster sampling method, included a questionnaire and measurements of blood pressure, height, and body weight. Fasting blood samples were taken for measurements of thyroid-stimulating hormone (TSH), free 3,5,3'-triiodothyronine (FT(3)) and free thyroxine (FT(4)). Serum TSH and FT(3) were positively correlated with systolic and diastolic blood pressure Z scores (SBP-Z and DBP-Z) even after adjusting for body mass index (BMI) (P < 0.05) but no correlation was observed between FT(4) and SBP-Z or DBP-Z after comparable adjustments (P > 0.05). SBP-Z and DBP-Z in subjects with subclinical hypothyroidism were significant higher than in euthyroid subjects (P < 0.05). Both SBP-Z and DBP-Z increased linearly with TSH concentration in boys after adjusting BMI (P < 0.05); however, a similar linear trend was not observed in girls. Our findings support the hypothesis that elevated TSH and FT(3) concentrations increase blood pressure in school-aged Chinese subjects without overt thyroid disease; this increase may be even more significant in boys.
    Endocrine 02/2012; 41(1):122-9. · 1.42 Impact Factor
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    ABSTRACT: The relationship between subclinical thyroid dysfunction and blood pressure has been controversial and received unsufficient attention. Thus, we performed a cross-sectional study conducted among 6,992 inhabitants from six districts of Jiangsu Province to investigate the association of subclinical thyroid dysfunction with blood pressure in China. The data from 6,583 subjects (4,115 women and 2,468 men) were included and divided into three groups: euthyroidism (n = 5669, 86.11%), subclinical hyperthyroidism (n = 108, 1.65%), and subclinical hypothyroidism (n = 806, 12.24%). In the groups with subclinical hypothyroidism and hyperthyroidism, systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse pressure were not significantly different from those in the groups with euthyroidism after being adjusted for age, sex, BMI, and smoking status (P > 0.05). More extensively, the SBP and DBP in the group of subclinical hypothyroidism with lower level of TSH (TSH 4.51-10.00 mIU/l, SCH(1)) were significantly higher than those of participants with euthyroidism (P < 0.05). Multivariable logistic analysis revealed that subclinical hypothyroidism with lower TSH (TSH 4.51-10.00 mIU/l) was an independent risk factor for increased SBP (OR = 1.28, 95% CI 1.03-1.59, P = 0.028). Similar results could not be found between groups of euthyroid and subclinical hypothyroid with higher level of TSH (TSH > 10 mIU/l, SCH(2)). Further subdivision of the euthyroid group on the basis of a TSH cut-off of 2.5 mIU/l, revealed still no significant difference in blood pressure after adjustment regardless of whether the TSH levels were in the lower reference (TSH 0.40-2.50 mIU/l, n = 4093) or in the upper reference ranges (TSH 2.51-4.50 mIU/l, n = 1576) (P > 0.05). We concluded that subclinical thyroid dysfunction was not associated with blood pressure. Neither subclinical hyperthyroidism nor subclinical hypothyroidism independently predicted increased blood pressure.
    Endocrine 02/2009; 35(2):136-42. · 2.25 Impact Factor