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Aim: Thyroid dysfunction is closely associated with periodontitis. We aim to explore the association between sensitivity to thyroid hormones (THs) and periodontitis and to investigate the mediating role of serum 25-hydroxyvitamin D[25(OH)D] in this relationship in Chinese euthyroid populations. Methods: This population-based retrospective study included 2,530 euthyroid participants. Central sensitivity to THs was assessed by the thyroid feedback quantile-based index (TFQI), parametric thyroid feedback quantile-based index (PTFQI), thyrotrophic thyroxine resistance index (TT4RI) and thyroid-stimulating hormone index (TSHI), while FT3/FT4 was evaluated to assess peripheral sensitivity. Multivariable regression analysis and restricted cubic spline were performed to explore the association between sensitivity to THs and periodontitis. Threshold effect and subgroup analysis were also conducted. Mediation analysis was performed to estimate direct and indirect effects through 25(OH)D. Results: Multivariable regression analysis indicated that central sensitivity to THs indices(per SD increase) were positively associated with periodontitis risk [TFQI: OR=1.19,95% CI (1.09, 1.31); PTFQI: OR=1.22, 95% CI(1.12,1.34); TSHI: OR=1.36, 95% CI (1.21,1.52); TT4RI: OR=1.43, 95% CI (1.25,1.63)](all P value <0.001). TT4RI only had a non-linear relationship with periodontitis in euthyroid participants. Subgroup analysis showed that no significant correlations were founded among those aged over 65 years or with hypertension/diabetes. Mediation analysis revealed that the proportions mediated by 25(OH)D on the association of TFQI, PTFQI,TSHI, TT4RI and periodontitis risk were 16.37%, 16.43%, 9.93% and 10.21%, respectively. Conclusions: Impaired central sensitivity to THs is positively associated with periodontitis in euthyroid and serum 25(OH)D might be one of its biological mechanisms. [ABSTRACT FROM AUTHOR]

Aims: We evaluated the association of multiple thyroid parameters with the levels interleukin 6 (IL6) and interleukin 8 (IL8) in patients with euthyroid type 2 diabetes (T2D). Methods: A total of 166 adults with euthyroid T2D were examined. Serum IL6, IL8, triiodothyronine (FT3), free thyroxin (FT4), thyroid-stimulating hormone (TSH), five thyroid sensitivity indexes (FT3/FT4, TSH index [TSHI], thyrotroph T4 resistance index [TT4RI], thyroid feedback quantile-based index by FT3 [TFQIFT3], and TFQIFT4), and biochemical parameters were determined. Results: The median age was 64 years (IQR: 54.75,70) and the median duration of diabetes was 10 years (IQR: 3,18). Patients with high levels of IL6 (≥2.38 pg/mL) had lower levels of FT3 and TFQIFT3 (P <0.05). Patients with high levels of IL8 (≥18.1 pg/mL) had lower levels of TSH and higher levels of FT4 (P <0.05). IL6 was negatively correlated with FT3 (r=−0.359, P <0.001), TFQIFT3 (r=−0.273, P =0.009), and FT3/FT4 (r=−0.22, P =0.037). IL8 was negatively correlated with TSH (r=−0.256, P =0.01), TSHI (r=−0.226, P =0.033), and TT4RI (r=−0.244, P =0.021). Binary logistic regression analysis with multiple adjusted models showed that a high level of IL6 was negatively associated with FT3 (aOR: 0.529; 95%CI: 0.302, 0.926, P =0.026), and that a high level of IL8 was negatively associated with TSH (aOR: 0.343; 95%CI: 0.155, 0.759; P =0.008) and TT4RI (aOR: 0.398;95%CI: 0.191, 0.831; P= 0.014). Conclusion: Patients with euthyroid T2D who had lower levels of FT3 had significantly higher levels of IL6, and those with lower levels of TSH and TT4RI had significantly higher levels of IL8. [ABSTRACT FROM AUTHOR]

Background: Subclinical hypothyroidism (SCH) in pregnancy is associated with adverse foetomaternal outcomes. The literature is scarce with respect to maternal and perinatal outcomes in women with mild SCH (TSH levels between 2.5–4 mIU/L). Objectives: The primary objective of the study was to compare the pregnancy outcome between SCH and euthyroid women. The secondary objectives were to find out the proportion of women with SCH having thyroid peroxidase antibodies (TPOAb) and to see the effect of TPOAb positivity on foetomaternal outcomes. Materials and methods: A total of 178 pregnant women were recruited in the first trimester, and those with TSH between 0.1 and 2.4 mIU/L were considered as euthyroid and 2.5–4mIU/L were labelled as SCH. Women with SCH underwent testing for TPOAb. All women were followed until delivery, and foetomaternal outcomes were assessed. Results: Amongst SCH group, there was a significantly higher proportion of overweight and obese women (76/91 (83.51%) vs 59/87 (68%), p = 0.031). The neonatal intensive care unit (NICU) admission was higher with adjusted odds ratio of 3.24 (1.41–7.43) in women with SCH as compared to euthyroid women. Otherwise, there was no difference in foetomaternal outcomes between the two groups. The proportion of gestational diabetes mellitus, intrauterine growth retardation and still birth were higher in SCH women with TPOAb as compared to euthyroid. Amongst SCH women, the proportion of induced labour was lower (aOR:0.27 (0.08–0.93) whereas the proportion of stillbirth and low APGAR scores were higher in TPOAb-positive women with a statistically significant difference and adjusted odds ratio (aOR:20.18 (1.84–220.83)) and (aOR:4.77 (1.06–21.3)), respectively, when compared to TPOAb-negative women. Conclusion: There appears to be no difference in pregnancy outcomes between women with SCH and euthyroid women except higher NICU admission in SCH group. Future multi-centre large prospective studies are required to understand better about the pregnancy outcomes in these women. [ABSTRACT FROM AUTHOR]

This study aimed to investigate the associations between thyroid hormone (TH) levels, central sensitivity to THs, and body composition in overweight and obese patients with euthyroid type 2 diabetes mellitus (T2DM). Methods: This cross-sectional study included 1215 euthyroid T2DM patients (721 men and 494 women) aged 20– 80 years. The thyroid hormone sensitivity indices included the thyroid feedback quartile-based index (TFQI), thyrotroph T3 resistance index (TT3RI), thyrotroph T4 resistance index (TT4RI), and thyroid-stimulating hormone index (TSHI). The appendicular fat ratio, trunk fat ratio, android fat ratio, gynoid fat ratio, and appendicular skeletal muscle mass (ASM) were measured via dual-energy X-ray absorptiometry. Results: The data revealed a greater proportion of subjects with impaired central sensitivity to THs in the obese group. TFQIFT4 and TFQIFT3 levels were positively correlated with the upper limb fat ratio, lower limb fat ratio, gynoid fat ratio, and total fat ratio. TSHI was positively correlated with body mass index (BMI), upper limb fat ratio, lower limb fat ratio, trunk fat ratio, android fat ratio, gynoid fat ratio, total fat ratio, and appendicular skeletal muscle mass index (ASMI) in women. In men, TSHI was only positively correlated with upper limb fat ratio, lower limb fat ratio, and total fat ratio. Logistic regression analysis indicated that TT3RI and TFQIFT3 were independently and positively associated with central obesity and low muscle mass in overweight and obese men. No significant differences were found among the women. Conclusion: THs central sensitivity is related to the body composition of euthyroid T2DM patients. Specifically, high levels of TT3RI and TFQIFT3 are associated with central obesity and low muscle mass in T2DM men with overweight and obesity. [ABSTRACT FROM AUTHOR]

Immune Thrombocytopenic Purpura (ITP), an autoimmune disease, is characterised by isolated thrombocytopenia, with or without bleeding. Thyroid autoimmune illness can coexist with ITP. The specific clinical characteristics are still unknown. The length of ITP or the patients’ response to treatment is not related to their thyroid condition. In patients with ITP, thyroid impairment is more common. In the present case report, a 60-year-old female patient, a known case of asthma, presented to the hospital with complaints of swelling in the neck along with transient episodes of breathlessness for 3-4 years. On local examination, a butterfly-shaped mass was seen in the neck, which moved upwards on deglutination but did not move on protrusion of the tongue. Pemberton’s sign was also positive. On palpation, the thyroid measured around 8×6 cm in size, thyroid lobes were bosselated, consistency was firm, and no bruit was heard on auscultation. Based on routine laboratory findings, she was found to have refractory thrombocytopenia with a normal thyroid profile. Further investigations revealed that the patient had positive antithyroid stimulating hormone antibodies, and Fine Needle Aspiration Cytology (FNAC) showed colloid nodular goitre with haemorrhagic cystic changes. A bone marrow biopsy was performed in view of refractory thrombocytopenia, which was suggestive of ITP. The patient was advised to take tablet eltrombopag, after which the platelet counts improved drastically. Subsequently, the patient was advised to undergo thyroidectomy, but this could not be done due to haemodynamic instability.

Objective: Iodine is an essential mineral for the synthesis of thyroid hormones, so its deficiency can lead to serious problems. Therefore, routine iodine supplementation is recommended for pregnant women by World Health Organization .Fetal thyroid disorder is uncommon, and typically arises in the context of a managed maternal thyroid condition. Antithyroid therapy in mothers contributes to 10–15% of cases of congenital hypothyroidism in fetuses. The excessive iodine ingestion above daily intake limits during the pregnancy is a well-known mechanism among the known causes of fetal goiter. The occurrence of fetal goiter in babies of euthyroid mothers is quite rare. Fetal goiter, due to the maternal and fetal complications it causes, affects long-term morbidity and mortality. Among these complications are polyhydramnios, intrauterine growth restriction (IUGR), preterm birth, labor dystocia, hypoxia and brain damage resulting from airway obstruction caused by this mass. Case(s): At 24 weeks pregnant, a 27-year-old primigravida was referred for a routine second trimester ultrasound evaluation despite not having a relevant family history or any personal thyroid or autoimmune illness. which showed cervical hyperextension and a high vascularized, bilobed, and symmetric mass in the anterior region of the fetal neck measuring 2.6 cm cranio-caudal × 1.5 cm transverse >%95 SD, suggesting fetal goiter. No signs of polyhydramnios, and no other fetal anomalies were found. Overall, these findings stated fetal goiter. Conclusion: The clinicians and healthcare providers should carefully review the medications and supplements used by patients and ensure they are being used at the correct dosage. Improper use of any medication can lead to teratogenic effects. [ABSTRACT FROM AUTHOR]

Objective: Assessing fetal behavior in utero is challenging and of great value for perinatal screening, but the evolution of ultrasonography has led to a better comprehension of fetal pathology. Antenatal screening for early detection of fetal neurological well-being has provided valuable information. The aim of this study is to determine a possible correlation between hypothyroidism in pregnancy and altered fetal behavior. Materials and methods: Kurjak antenatal neurodevelopmental test (KANET) was applied from 28 weeks to 38 weeks in 85 gestations (group A) with hypothyroidism and 87 euthyroid pregnant women (group B). Results: No statistically significant differences were observed considering maternal age (29.2 ± 4.9 years for group A vs 29.7 ± 3.3 years for group B) and gestational age (GA) (33 ± 1.6 weeks for hypothyroidic compared to 33 ± 2.1 weeks for euthyroidic group). The control group reported higher KANET scores than group A. Conclusion: It appears that fetal behavior differences are observed in women with hypothyroidism. [ABSTRACT FROM AUTHOR]

Immune Thrombocytopenic Purpura (ITP), an autoimmune disease, is characterised by isolated thrombocytopenia, with or without bleeding. Thyroid autoimmune illness can coexist with ITP. The specific clinical characteristics are still unknown. The length of ITP or the patients’ response to treatment is not related to their thyroid condition. In patients with ITP, thyroid impairment is more common. In the present case report, a 60-year-old female patient, a known case of asthma, presented to the hospital with complaints of swelling in the neck along with transient episodes of breathlessness for 3-4 years. On local examination, a butterfly-shaped mass was seen in the neck, which moved upwards on deglutination but did not move on protrusion of the tongue. Pemberton’s sign was also positive. On palpation, the thyroid measured around 8×6 cm in size, thyroid lobes were bosselated, consistency was firm, and no bruit was heard on auscultation. Based on routine laboratory findings, she was found to have refractory thrombocytopenia with a normal thyroid profile. Further investigations revealed that the patient had positive antithyroid stimulating hormone antibodies, and Fine Needle Aspiration Cytology (FNAC) showed colloid nodular goitre with haemorrhagic cystic changes. A bone marrow biopsy was performed in view of refractory thrombocytopenia, which was suggestive of ITP. The patient was advised to take tablet eltrombopag, after which the platelet counts improved drastically. Subsequently, the patient was advised to undergo thyroidectomy, but this could not be done due to haemodynamic instability. [ABSTRACT FROM AUTHOR]

AimThyroid dysfunction is closely associated with periodontitis. We aim to explore the association between sensitivity to thyroid hormones (THs) and periodontitis and to investigate the mediating role of serum 25-hydroxyvitamin D[25(OH)D] in this relationship in Chinese euthyroid populations.MethodsThis population-based retrospective study included 2,530 euthyroid participants. Central sensitivity to THs was assessed by the thyroid feedback quantile-based index (TFQI), parametric thyroid feedback quantile-based index (PTFQI), thyrotrophic thyroxine resistance index (TT4RI) and thyroid-stimulating hormone index (TSHI), while FT3/FT4 was evaluated to assess peripheral sensitivity. Multivariable regression analysis and restricted cubic spline were performed to explore the association between sensitivity to THs and periodontitis. Threshold effect and subgroup analysis were also conducted. Mediation analysis was performed to estimate direct and indirect effects through 25(OH)D.ResultsMultivariable regression analysis indicated that central sensitivity to THs indices(per SD increase) were positively associated with periodontitis risk [TFQI: OR=1.19,95% CI (1.09, 1.31); PTFQI: OR=1.22, 95% CI(1.12,1.34); TSHI: OR=1.36, 95% CI (1.21,1.52); TT4RI: OR=1.43, 95% CI (1.25,1.63)](all P value

AimsWe evaluated the association of multiple thyroid parameters with the levels interleukin 6 (IL6) and interleukin 8 (IL8) in patients with euthyroid type 2 diabetes (T2D).MethodsA total of 166 adults with euthyroid T2D were examined. Serum IL6, IL8, triiodothyronine (FT3), free thyroxin (FT4), thyroid-stimulating hormone (TSH), five thyroid sensitivity indexes (FT3/FT4, TSH index [TSHI], thyrotroph T4 resistance index [TT4RI], thyroid feedback quantile-based index by FT3 [TFQIFT3], and TFQIFT4), and biochemical parameters were determined.ResultsThe median age was 64 years (IQR: 54.75,70) and the median duration of diabetes was 10 years (IQR: 3,18). Patients with high levels of IL6 (≥2.38 pg/mL) had lower levels of FT3 and TFQIFT3 (P

Background: Subclinical hypothyroidism, defined by elevated thyrotropin (TSH) and normal free thyroxine levels, is associated with adverse pregnancy outcomes, including preterm birth, pre-eclampsia, and small for gestational age. Despite the uncertainty regarding the effectiveness of levothyroxine (LT4) treatment on pregnancy outcomes in subclinical hypothyroidism, LT4 is widely administered with a pre-treatment threshold TSH level of 2.5 mU/L. The aim of this study is to investigate the efficacy of periconceptional LT4 treatment for subclinical hypothyroidism, including TSH levels >2.5 mU/L, and identify the characteristics of subclinical hypothyroidism that can benefit from LT4 treatment. Methods: We conducted a systematic review and meta-analysis of randomized controlled trials from inception to February 2023. We analyzed the pooled effects of LT4 on subclinical hypothyroidism before and during pregnancy. The main outcomes before pregnancy were live birth, pregnancy, and miscarriage. The main outcomes during pregnancy were live birth, miscarriage, and preterm birth. We conducted subgroup analyses to compare the effects of LT4 on subclinical hypothyroidism with TSH levels of 2.5–4.0 and >4.0 mU/L. Results: Of the 888 studies identified, 27 full-text articles were screened for eligibility. Five studies on pre-conception treatment with 768 participants and eight studies on treatment during early pregnancy with 2622 participants were analyzed. One of the two studies on pre-conception treatment in subclinical hypothyroidism with TSH >4.0 mU/L had high risk of bias and the other was composed of 64 participants. Pre-conception LT4 treatment had no significant effect in improving rates of live births and pregnancies, or reducing miscarriages (risk ratio [RR], 95% confidence interval): 1.41 (0.84–2.36), 1.73 (0.88–3.39), and 0.46 (0.11–2.00), respectively. LT4 treatment during pregnancy was not significantly associated with higher rates of live births (RR 1.03, 0.98–1.09) nor decreased miscarriage rates (RR 1.01, 0.66–1.53). The effect of LT4 treatment on preterm birth during pregnancy was significantly different depending on the TSH values (p = 0.04); a positive effect was shown in the subclinical hypothyroidism subgroup with TSH >4.0 mU/L (RR 0.47, 0.20–1.10), while no significant effect was observed in the subgroup with TSH 2.5–4.0 mU/L (RR 1.35, 0.79–2.31). Conclusions: Pre-conceptional LT4 treatment for subclinical hypothyroidism does not improve fertility or decrease the incidence of miscarriages. However, further well-designed studies are needed for pre-conceptional treatment, especially in TSH >4.0 mU/L. LT4 treatment during pregnancy had a positive effect on preterm birth; nevertheless, this was only applicable to subclinical hypothyroidism with TSH >4.0 mU/L. [ABSTRACT FROM AUTHOR]

Background: There are inconsistent results about the effect of gastric bypass surgery on thyroid function tests in morbidly obese subjects. The aim of this study was to investigate the changes in thyroid function tests and insulin resistance status in euthyroid morbidly obese subjects before and three months after gastric bypass surgery (GBS). Methods: Twenty-nine subjects with morbid obesity (BMI=40) were enrolled in this before-after study. Patients with known thyroid disorders or a history of thyroid ablative therapy, users of drugs that affect thyroid function, or fasting blood sugar and insulin were excluded. TSH, Free T4, total T3, fasting blood sugar and insulin level, and BMI were measured before and 3 months after GBS. Statistical analysis was performed with appropriate tests and p<0.05 was considered significant. Results: Body mass index (BMI), insulin sensitivity index (HOMA-IR), and total T3 significantly decreased after bypass surgery (all with p<0.001) but no significant changes were seen in TSH (P=0.203) and FreeT4 (P=0.33). There was a significant negative correlation between changes in HOMA-IR and changes in FreeT4 (P=0.038, r= -0.38). There was no statistically significant correlation between the percentage of excess BMI loss (%EBMIL) and changes in T3 (P=0.66), Free T4 (P=0.92), TSH (P= 0.27), and HOMA-IR (P=0.17). Conclusion: Although significant changes can occur in BMI, insulin sensitivity index, fasting blood sugar, and T3 in short-time follow-up after bariatric surgery, significant TSH and FreeT4 changes may need longer follow-ups. [ABSTRACT FROM AUTHOR]

Objective: Although several studies have examined the relationship between thyroid function and muscle strength, their population primarily derived from Asian areas, and their results were controversial. Thus, this study aimed to explore the association between thyroid function and handgrip strength (HGS) in the U.S. population. Methods: A total of 1,067 participants from NHANES were categorized into three different age groups including young (<45 years), middle (45~64 years), and old (≥65 years) age groups. Thyroid function was measured by the competitive binding immune-enzymatic assays, while HGS was examined by a trained evaluator using a dynamometer. The weighted multiple linear regression models were used to examine the association between thyroid function and handgrip strength. The restricted cubic splines were employed to explore the non-linear relationship between these two variables. All statistical analyses were performed using the SPSS version 20.0 and R software. Results: After adjustment for potential covariates, FT3/FT4, but not TSH was positively associated with HGS in middle age group (b=0.091, t=2.428, P=0.016). The subgroup analysis by sex revealed that the positive association between FT3/ FT4 and HGS was observed in the middle age group for both male and female participants (b=0.163, t=2.121, P=0.035; b=0.157, t=2.180, P=0.031). The RCS analysis showed a statistically significant non-linear association between FT3/FT4 and HGS in overall population (P for non-linear=0.026). After adjustment for covariates, men with low HGS had a significant lower FT3/FT4 than those without low HGS in old age group (P=0.013). There was a significant increase in TSH level for female participants with low HGS in old age group compared to those with normal HGS (P=0.048). Conclusions: This study demonstrated FT3/FT4, but not TSH, was positively associated with HGS in middle age group, and the different association was observed in men in middle age group when participants were stratified by sex. Future longitudinal cohort study should be conducted to reveal the causal relationship between thyroid function and muscle strength. [ABSTRACT FROM AUTHOR]

Context: The relationship between vitamin D and thyroid profiles lacks consensus despite extensive investigations. Whether vitamin D levels correlate with thyroid hormone sensitivity remains largely unexplored. Objective: To explore the relationship between vitamin D levels and thyroid hormone sensitivity among euthyroid individuals. Methods: This study involved 6452 euthyroid participants. Clinical parameters, including TSH, free thyroxine, 25-hydroxyvitamin D [25(OH)D], and other relevant indicators were extracted from the National Health and Nutrition Examination Survey 2007-2012. To quantify thyroid hormone sensitivity, we calculated the Thyroid Feedback Quantile-based Index (TFQI), the TSH index (TSHI), and the thyrotropin thyroxine resistance index (TT4RI). Results: Subjects with impaired thyroid hormone sensitivity have decreased 25(OH)D levels (TFQI, TT4RI: P < 0.05; TSHI: P = .05574) following adjustment of confounding variables. Age-specific analysis found negative correlations between thyroid hormone sensitivity indices and 25(OH)D within the 20 to 60 years subgroup, turning positive in the 60 to 80 years subgroup. In females, thyroid hormone sensitivity indices and vitamin D levels were negatively linked, while in males, vitamin D’s relationships with TFQI, TT4RI, and TSHI shifted from negative to positive when 25(OH) D levels exceeded 63.5 nmol/L, 56.7 nmol/L, and 56.7 nmol/L, respectively. Stratification by race revealed U-shaped curvilinear patterns resembling those found in the males. In body mass index (BMI) subanalysis, vitamin D had differing associations with thyroid hormone sensitivity indices: negative in the <25 kg/m² and ≥30 kg/m² subgroups and U-shaped in the 25-30 kg/m² subgroup. Conclusion: Impaired thyroid hormone sensitivity correlates with decreased vitamin D levels among euthyroid subjects, with associations varying by age, sex, race, and BMI. [ABSTRACT FROM AUTHOR]

Background: There are inconsistent results about the effect of gastric bypass surgery on thyroid function tests in morbidly obese subjects. The aim of this study was to investigate the changes in thyroid function tests and insulin resistance status in euthyroid morbidly obese subjects before and three months after gastric bypass surgery (GBS). Methods: Twenty-nine subjects with morbid obesity (BMI≥40) were enrolled in this before-after study. Patients with known thyroid disorders or a history of thyroid ablative therapy, users of drugs that affect thyroid function, or fasting blood sugar and insulin were excluded. TSH, Free T4, total T3, fasting blood sugar and insulin level, and BMI were measured before and 3 months after GBS. Statistical analysis was performed with appropriate tests and p

Jiangling Wang,1,2,&ast; Lijuan Yang,3,&ast; Wei Liu,1 Chaogang Wei,1 Junkang Shen1 1Department of Radiology, The Second Affiliated Hospital of Soochow University, Soochow, Jiangsu, People’s Republic of China; 2Department of Physical Diagnosis, Huadong Sanatorium, Wuxi, Jiangsu, People’s Republic of China; 3Department of Geriatric, Huadong Sanatorium, Wuxi, Jiangsu, People’s Republic of China&ast;These authors contributed equally to this workCorrespondence: Junkang Shen; Chaogang Wei, Department of radiology, The Second Affiliated Hospital of Soochow University, No. 1055 Sanxiang Road, Soochow, 215004, People’s Republic of China, Email shenjunkang@suda.edu.cn; weichaogang1122@163.comObjective: Previous research on the correlation between thyroid function and carotid plaque has revealed conflicting results, possibly attributable to the sensitivity of thyroid hormone indices. In this study, we aimed to analyze the association between thyroid hormone sensitivity indices and the risk of carotid plaque development in a Chinese health check-up population.Methods: A total of 19,388 health check-up subjects were included in this study (mean age: 50.78± 10.17 years). Central sensitivity to thyroid hormone was evaluated using the thyroid feedback quantile-based index (TFQI), the Chinese-referenced parametric TFQI (PTFQI), the TSH index (TSHI), and the thyrotropin thyroxine resistance index (TT4RI), while peripheral sensitivity to thyroid hormone was assessed by free triiodothyronine/free thyroxine (FT3/FT4) ratio. Multivariable logistic regression analyses were performed to detect the association between thyroid hormone sensitivity indices and carotid plaque risk, and subgroup analysis was also conducted to explore this association stratified by sex, age, obesity, and the status of smoking, drinking, diabetes, hypertension and dyslipidemia.Results: Among the 19,388 participants, 3753 (19.4%) had carotid plaque. In multivariable adjustment models, the risk of carotid plaque was positively associated with TSHI (odds ratio [OR]: 1.23; 95% confidence interval [CI]: 1.18~1.28), TT4RI (OR: 1.28; 95% CI: 1.23~1.33), TFQI (OR: 1.06; 95% CI: 1.02~1.10), and PTFQI (OR: 1.11; 95% CI: 1.07~1.16), respectively. Conversely, the risk of carotid plaque was negatively correlated with FT3/FT4 (OR: 0.94; 95% CI: 0.90~0.98). In stratified analyses, all thyroid hormone sensitivity indices significantly increased the risk of carotid plaque especially in females, subjects< 65 years, non-obese individuals, and those without current smoking, drinking, diabetes, hypertension and dyslipidemia.Conclusion: In Chinese health check-up populations, a considerable connection between reduced sensitivity to thyroid hormones and carotid plaque has been observed, especially in females, those younger than 65 years, non-obese individuals, and those without any current smoking, drinking, diabetes, hypertension, or dyslipidemia.Keywords: carotid plaque, thyroid hormone sensitivity, euthyroid, resistance to thyroid hormone, Chinese population

Chunxia Shi,1– 3,&ast; Xiaoning Liu,4,&ast; Zouxi Du,2,3,5 Limin Tian2,3 1School of Medicine, Jiangsu University, Zhenjiang, People’s Republic of China; 2Department of Endocrinology, Gansu Provincial Hospital, Lanzhou, People’s Republic of China; 3Clinical Research Center for Metabolic Diseases, Lanzhou, Gansu Province, People’s Republic of China; 4Institution of Health Statistics and Epidemiology, School of Public Health, Lanzhou University, Lanzhou, People’s Republic of China; 5The First School of Clinical Medicine, Lanzhou University, Lanzhou, People’s Republic of China&ast;These authors contributed equally to this workCorrespondence: Limin Tian, Department of Endocrinology, Gansu Provincial Hospital, Donggang West Road, Lanzhou, Gansu, 730000, People’s Republic of China, Tel +86-15293184257, Email tlm7066@sina.comPurpose: This study aims to investigate the relationship between thyroid and type 1 diabetic nephropathy (T1DN) in euthyroid populations, focusing on thyroid hormone sensitivity.Methods: A cross-sectional study was conducted between January 2016 and December 2021, including 357 euthyroid patients with type 1 diabetes mellitus (T1DM). Parameters representing thyroid hormone sensitivity were assessed, including the thyroid feedback quantile-based index (TFQI), parameter thyroid feedback quantile index (PTFQI), thyroid stimulating hormone index (TSHI), thyrotropin thyroxine resistance index (TT4RI), and free triiodothyronine/free thyroxine (FT3/FT4). Logistic regression and restricted cubic spline regression were performed to detect the association between thyroid hormone sensitivity and the risk of T1DN.Results: The study found a negative correlation between the risk of T1DN and FT3/FT4 in euthyroid T1DM patients (OR 0.71, 95% CI 0.51– 0.97, P < 0.01). PTFQI (P< 0.05), TSHI (P< 0.05), and TT4RI (P< 0.01) showed an M-shaped nonlinear relationship with the risk of T1DN. Elevated risk of T1DN was associated with PTFQI, TSHI, and TT4RI values outside the range of zero, 2.3– 3.88, and 27.56– 32.19, respectively.Conclusion: This study confirms the relationship between impaired thyroid hormone sensitivity and the risk of T1DN in euthyroid patients. It emphasizes the importance of evaluating thyroid hormone sensitivity in T1DM patients, even when their thyroid function appears normal, to promptly prevent the occurrence of T1DN.Keywords: euthyroid, sensitivity to thyroid hormones, type 1 diabetic nephropathy

Purpose: The present work examines the associations of dietary habits, sedentarism, physical activity (PA) levels and sleep habits, with thyroid function in young euthyroid adults. Methods: A total of 105 young euthyroid adults participated in this cross-sectional study. Thyroid function was determined in fasting conditions (> 6 h). Dietary habits were measured by a food frequency questionnaire and three non-consecutive 24 h recalls, and different dietary intake and patterns were then estimated. The time spent in sedentary, PA levels and sleep habits were objectively measured using a wrist-worn accelerometer. Results: Energy and carbohydrate intake were positively associated with thyroid stimulating hormone (TSH) (β = 0.222; R2 = 0.102; P = 0.022 and β = 0.425; R2 = 0.129; P = 0.007, respectively) whereas fat intake was negatively associated with TSH (β = −0.428; R2 = 0.137; P = 0.004). Energy intake was also positively associated with free triiodothyronine (β = 0.277; R2 = 0.137; P = 0.004). Further, adherence to the Mediterranean diet was negatively related to TSH and free thyroxine (FT4) (β = −0.221; R2 = 0.113; P = 0.020 and β = −0.268; R2 = 0.071; P = 0.007, respectively). Vigorous-intensity and overall PA were negatively associated with FT4 (β = −0.227; R2 = 0.052; P = 0.022 and β = −0.204; R2 = 0.042; P = 0.041, respectively). In contrast, no associations were found between sleep parameters and thyroid function. Conclusions: Lifestyle factors such as dietary intake and PA levels seems to be related to thyroid function even in young euthyroid adults.

This document presents the results of a study on the relationship between thyroid hormone status and blood pressure. The study divided participants into three groups: hypothyroid patients, hyperthyroid patients, and healthy controls. The study found that resting systolic blood pressure was significantly higher in hyperthyroid patients compared to the other groups. The study suggests that elevated levels of thyroid hormone can increase cardiac output, leading to higher blood pressure. The study concludes that maintaining normal thyroid hormone levels is important for preventing the negative effects of elevated blood pressure. [Extracted from the article]

Background It appears to be relatively simple to control postoperative hypothyroidism after total thyroidectomy (TT) with L-T4 replacement therapy, but from the patient's perspective, a daily reliance on L-T4 administration and regular follow-up visits to the hospital may become somewhat of a burden and may interfere with reaching euthyroid status utilizing replacement therapy because of patient noncompliance. Aim and objectives To evaluate implantation of thyroid tissue in the thigh muscle after TT for benign simple nodular goiter to avoid lifelong use of thyroid hormones as replacement therapy and preservation of autoregulatory mechanism of thyroid hormone production. Patients and methods From April 2021 to September 2022, with approval from the Ethics Committee of the Faculty of Medicine at Assiut University, Assiut, Egypt, 40 individuals with simple nodular goiter who required TT participated in a prospective case series study. Results There was significant relation between 12 months follow up thyroid-stimulating hormone (TSH) levels and preoperative TSH levels. There was significant relation between 12 months follow up free T4 levels and preoperative TSH levels. Conclusion When performed on individuals who have benign thyroid disorders, TT is followed by autotransplantation of the patient's own thyroid tissue. This technique is safe, straightforward, and applicable, and it results in a postoperative euthyroid state in the vast majority of carefully selected individuals without the need for additional replacement therapy. [ABSTRACT FROM AUTHOR]

Introduction: Hypothyroidism, a prevalent endocrine disorder, leads to a generalised metabolic slowdown due to insufficient thyroid hormone production, potentially resulting in elevated levels of serum uric acid and creatinine, thus affecting renal function and purine metabolism. Aim: To assess serum creatinine and serum uric acid levels in hypothyroid patients while establishing correlations with their thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) levels. Materials and Methods: A comparative cross-sectional study was conducted in the Department of Biochemistry, Government Medical College, Kozhikkode, Kerala, India. The study involved 140 participants, including 70 recently diagnosed hypothyroid patients and 70 age- and sex-matched euthyroid individuals. Thyroid hormone levels (FT3, FT4) and TSH were quantified using the Cobas e411 electro-chemiluminescence technique. Serum creatinine levels were measured using the Modified Jaffe’s method, and serum uric acid levels were assessed through the Uricase method (Enzokit). Data analysis was performed using Statistical Package for the Social Sciences (SPSS) version 21.0, and tables and graphs were generated using Microsoft Word and Excel. Results: The mean age of study participants of control group was 39.02 years and of the hypothyroid group was 36.80 years. The comparative cross-sectional analysis revealed significantly higher levels of serum uric acid and serum creatinine in hypothyroid patients compared to euthyroid controls. Specifically, hypothyroid patients exhibited a mean serum uric acid level of 10.77±2.34 mg/dL, while euthyroid controls had a mean of 4.37±0.94 mg/dL. Mean serum creatinine levels for hypothyroid patients and euthyroid controls were 2.16±0.80 mg/dL and 0.75±0.14 mg/dL, respectively. Notably, a significant positive correlation was observed between serum uric acid and serum creatinine levels with TSH (r=0.42, p-value

Jing Du, Xin Zhao, Xiumei Xu, Zhichao Zhang, Xiaomei Zhang Department of Endocrinology and Metabolism, Peking University International Hospital, Beijing, People’s Republic of ChinaCorrespondence: Xiaomei Zhang, Department of Endocrinology and metabolism, Peking University International Hospital, No. 1 Life Garden Road Zhongguancun Life Science Garden Changping District, Beijing, People’s Republic of China, Tel/Fax +86-010-69006105, Email z.x.mei@163.comPurpose: To explore the association between thyroid parameters and subclinical atherosclerosis (AS) in hospitalised euthyroid patients with type 2 diabetes mellitus (T2DM).Patients and Methods: A retrospective analysis was conducted involving 1245 inpatients with T2DM. Free triiodothyronine (FT3), free thyroxine (FT4), and thyroid stimulating hormone (TSH) levels were measured, and carotid artery ultrasonography was performed. Thyroid hormone (TH) sensitivity was evaluated using thyroid feedback quantile-based index (TFQI), TSH index (TSHI), thyrotropin thyroxine resistance index (TT4RI), and free triiodothyronine/free thyroxine ratio (FT3/FT4).Results: In inpatients with T2DM having normal thyroid function, the incidence of subclinical AS declined with increasing levels of FT3, FT4, and FT3/FT4 (P trend < 0.05). Logistic regression analysis revealed that FT4 (OR, 0.914; 95% CI, 0.845– 0.989), FT3 (OR, 0.374; 95% CI, 0.277– 0.504), and FT3/FT4 (OR, 0.036; 95% CI, 0.013– 0.061) were independently associated with subclinical AS (P < 0.05). However, TSH, TFQI, TSHI, and TT4RI levels were not associated with subclinical AS (P > 0.05). FT3/FT4 demonstrated superior predictive accuracy for subclinical AS than that of FT3 or FT4 alone (P < 0.001), with a cutoff point of 0.25.Conclusion: In euthyroid inpatients with T2DM, subclinical AS exhibited negative correlation with FT3, FT4, and FT3/FT4 levels, independent of other risk factors for AS. Additionally, FT3/FT4 ratio had a good predictive value for subclinical AS.Keywords: thyroid hormone, thyroid hormone sensitivity, euthyroid, diabetes mellitus, atherosclerosis

Introduction: Hypothyroidism, a prevalent endocrine disorder, leads to a generalised metabolic slowdown due to insufficient thyroid hormone production, potentially resulting in elevated levels of serum uric acid and creatinine, thus affecting renal function and purine metabolism. Aim: To assess serum creatinine and serum uric acid levels in hypothyroid patients while establishing correlations with their thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) levels. Materials and Methods: A comparative cross-sectional study was conducted in the Department of Biochemistry, Government Medical College, Kozhikkode, Kerala, India. The study involved 140 participants, including 70 recently diagnosed hypothyroid patients and 70 age- and sex-matched euthyroid individuals. Thyroid hormone levels (FT3, FT4) and TSH were quantified using the Cobas e411 electro-chemiluminescence technique. Serum creatinine levels were measured using the Modified Jaffe's method, and serum uric acid levels were assessed through the Uricase method (Enzokit). Data analysis was performed using Statistical Package for the Social Sciences (SPSS) version 21.0, and tables and graphs were generated using Microsoft Word and Excel. Results: The mean age of study participants of control group was 39.02 years and of the hypothyroid group was 36.80 years. The comparative cross-sectional analysis revealed significantly higher levels of serum uric acid and serum creatinine in hypothyroid patients compared to euthyroid controls. Specifically, hypothyroid patients exhibited a mean serum uric acid level of 10.77±2.34 mg/dL, while euthyroid controls had a mean of 4.37±0.94 mg/dL. Mean serum creatinine levels for hypothyroid patients and euthyroid controls were 2.16±0.80 mg/dL and 0.75±0.14 mg/dL, respectively. Notably, a significant positive correlation was observed between serum uric acid and serum creatinine levels with TSH (r=0.42, p-value<0.001 and r=0.45, p=0.00, respectively). Conclusion: The study identified significantly higher levels of serum uric acid and creatinine in hypothyroid patients compared to euthyroid individuals, potentially attributed to haemodynamic changes and disruptions in purine metabolism. Regular monitoring of these parameters is crucial for individuals with hypothyroidism. [ABSTRACT FROM AUTHOR]

Diabetes mellitus (DM) and thyroid dysfunction, which have a significant incidence worldwide, are the most common endocrine system disorders that occur together in patients. Our aim is to explain these 2 diseases with high incidence and the relationship between these 2 diseases. Thyroid hormones (TH) are essential hormones that govern body metabolism. Thyroid hormone changes are thought to be effective on the pathogenesis of DM. Diabetes mellitus treatments can be beneficial, as TH changes may contribute to the pathogenesis of DM. However, more research needs to be done. This lack of information limits potential biomarkers and targets for diagnosis, prognosis, and the development of new DM treatments. The limitations of the use of natural THs have led to the development of synthetic hormones called thyromimetics. However, most of the thyromimetics tested so far have been ineffective or toxic. [ABSTRACT FROM AUTHOR]

Introduction: Hypothyroidism, one of the most common thyroid gland disorders, can cause electrolyte disturbances in the body. Hypothyroidism can alter mineral metabolism by changing the levels of serum calcium and magnesium. Therefore, it is essential to study any abnormalities in calcium and magnesium metabolism in patients with hypothyroidism. Aim: The aim of this study was to assess the levels of calcium and magnesium in patients with hypothyroidism and to study the correlation between Thyroid Stimulating Hormone (TSH), fT3, and fT4 with calcium and magnesium in subclinical and Overt Hypothyroidism (OH). Materials and Methods: This cross-sectional study was held from August 2019 to January 2020 in the Department of Biochemistry, BS Medical College, Bankura. A total of 150 subjects were included in the study, distributed equally among three groups: euthyroidism, subclinical hypothyroidism, and OH. Serum TSH, fT3, fT4, calcium, and magnesium levels were determined in the laboratory, and the data obtained were statistically analysed using ANOVA test and Pearson’s correlation test. Results: Out of a total of 150 subjects, 61 were female, among whom 23 had subclinical hypothyroidism and 21 had OH. There were significant differences in the mean levels of TSH, fT3, fT4, calcium, and magnesium between the SCH, OH, and euthyroid groups. The study showed that the mean serum calcium level was significantly lower in SCH and OH compared to euthyroids, while the level of serum magnesium was significantly increased in SCH and OH compared to euthyroid. There was a statistically significant negative correlation between TSH and serum calcium in both OH and SCH, while a statistically significant positive correlation was observed between TSH and serum magnesium levels in both groups. Conclusion: The present study revealed that serum magnesium levels were high while serum calcium levels were low in both subclinical hypothyroidism and OH when compared to euthyroid subjects. Additionally, calcium levels negatively correlated with TSH, while magnesium levels positively correlated with TSH levels.

Objective: The aim of this study was to elaborate the link of thyroid hormones (THs) and metabolic syndrome (MetS) in a Chinese euthyroid employee popul ation with MetS component(s). Methods: An annual health checkup was performed on employees in 2019. Anthropometric parameters, metabolic parameters, and thyroid function were measured. A questionnaire was used in conjunction with Zhenhai Lianhua Hospital database to receive employees' medication records and thyroid s urgical history records. Results: A total of 5486 eligible employees were included; the prevalen ce of MetS was generally higher in males than in females (38.9 vs. 30.4%, P < 0.001). Among employees with central obesity, hypertriglyceridemia, hyperglycemia, hypertension, and low high-density lipoprotein cholesterol (HDL-C), the prevalence of MetS was 68.8, 63.6, 68.2, 48.8, and 60.0% in males and 72.6, 63.3, 61.3, 42.3, and 42.3% in females, respectively. Logistic regression analysis showed that thyroid-stimulating hormone and free thyroxine (FT4) quartiles had no significant impact on MetS. Free triiodot hyronine/free thyroxine (FT3/FT4) and free triiodothyronine (FT3)) quartiles were posit ively associated with the increased odds ratio (OR) for MetS and dyslipidemia (hypertrigl yceridemia and low HDL-C), regardless of gender. In males, FT3 and FT3/FT4 quartil es were positively associated with the OR for central obesity, whereas FT4 quartil es were negatively associated; both FT3 and FT4 quartiles were positively associat ed with increased OR of hyperglycemia, while similar results were not observed in femal es. Interaction analysis indicated no significant effect of gender and TH interactions on risk of MetS. Conclusion: High FT3 and FT3/FT4 were strongly linked with MetS and dyslip idemia in our study, even in the euthyroid individuals. Tighter control of th yroid function was necessary for those with preexisting MetS component(s).

The effectiveness of newborn screening (NBS) for congenital hypothyroidism (CH) relies on timely screening, confirmation of diagnosis, and initiation and ongoing monitoring of treatment. The objective of this study was to ascertain the extent to which infants with CH have received timely and appropriate management within the first 3 years of life, following diagnosis through NBS in Alberta, Canada. Deidentified laboratory data were extracted between 1 April 2014 and 31 March 2019 from Alberta Health administrative databases for infants born in this time frame. Time to lab collection was anchored from date of birth. Timeliness was assessed as the frequency of monitoring of Thyroid Stimulating Hormone (TSH) and appropriateness as the frequency of children maintaining biochemical euthyroidism. Among 160 term infants, 95% had confirmation of diagnosis by 16 days of age. The cohort had a median of 2 (range 0–5) TSH measurements performed in the time interval from 0 to 1 month, 4 (0–12) from 1 to 6 months, 2 (0–10) from 6 to 12 months, and 7 (0–21) from 12 to 36 months. Approximately half were still biochemically hypothyroid (TSH > 7 mU/L) at 1 month of age. After becoming euthyroid, at least some period of hypo- (60%) or hyperthyroidism (TSH < 0.2 mU/L) (39%) was experienced. More work needs to be performed to discern factors contributing to prolonged periods of hypothyroidism or infrequent lab monitoring.

Sudden spontaneous swelling in the neck is an emergency condition required to be addressed immediately. It poses a diagnostic dilemma. It is extremely rare for a thyroid malignancy to present as a sudden onset neck swelling in a euthyroid young male with no obvious trauma to the neck. This is a rare case report of a follicular variant of papillary carcinoma thyroid presenting as sudden neck swelling to the extent of shifting trachea to other side in a young euthyroid male. [ABSTRACT FROM AUTHOR]

Objective: To compare the frequency and types of anemia in subclinical hypothyroid and euthyroid patients. Study Design: Comparative cross sectional study. Place and Duration: Department of Medicine, PNS Shifa, Karachi Pakistan, from Jun 2019 to Dec 2019. Methodology: All patients who fulfilled the inclusion criteria and visited Medicine Department, PNS Shifa Karachi were included in the study. After ethical approval and informed written consent patients were divided into two groups, subclinical hypothyroidism group (149 patients) and euthyroid group (148 patients). Blood samples of all included patients were sent for hematocrit, mean cell volume and hemoglobin level to assess the outcome i-e anemia & its different types. Results: A total of 297 patients were included in the study. Amongst the sub clinically hypothyroid patients, anemia was noted in 40 patients (26.9%), while in the euthyroid group, it was noted in 23 patients (15.5%). In the subclinical hypothyroidism group, the type of anemia was microcytic in 13 patients (8.7%), macrocytic in 7 patients (4.7%) and normocytic in 20 patients (13.4%); while in the euthyroid group, anemia was microcytic in 7 patients (4.7%), macrocytic in 4 patients (2.7%) and normocytic in 12 patients (8.1%). Conclusion: The commonest type of anemia found in sub clinically hypothyroid patients is normocytic normochromic anemia. The frequency of anemia was 26.9% in the subclinical hypothyroid group and 15.5% in the euthyroid group. [ABSTRACT FROM AUTHOR]

Objective: To compare the demographic and clinical phenotypes of thyroid-associated ophthalmopathy (TAO) with euthyroidism (Eu-TAO), hyperthyroidism (Hr-TAO), and hypothyroidism (Ho-TAO). Methods: We enrolled 2158 TAO patients in this retrospective study and assessed their demographics, clinical manifestations, activity, and severity. Results: Among the enrolled patients, 526 (24.37%) had Eu-TAO, 1544 (71.55%) had Hr-TAO, and 88 (4.08%) had Ho-TAO. Compared to Hr-TAO (2.02) and Ho-TAO (2.52) patients, Eu-TAO (1.57) patients had the lowest female-to-male ratio (p = 0.026). The mean ages of Eu-TAO, Hr-TAO, and Ho-TAO patients were 43.11 ± 12.05, 42.23 ± 13.63, and 47.39 ± 13.28 years, respectively (p = 0.001). Patients with Eu-TAO had more unilateral involvement (50% vs. 14.38% vs. 21.59%, p < 0.001) than Hr-TAO or Ho-TAO patients. Clinically active TAO patients presented 8.56% in euthyroid vs. 13.86% in hyperthyroid vs. 11.36% in hypothyroid (p = 0.006). Regarding the severity of the European Group on Graves' Orbitopathy (EUGOGO) classification among euthyroid, hyperthyroid, and hypothyroid patients, mild TAO was present in 67.68, 54.27, and 72.72% of participants, moderate-to-severe TAO in 31.18, 42.49, and 26.14%, and sight-threatening TAO in 1.14, 3.24, and 1.14%, respectively. Eu-TAO was positively correlated with unilateral involvement (OR = 5.671, p < 0.001) and age (OR = 1.013, p = 0.003) and negatively correlated with the female-to-male ratio (OR = 0.656, p < 0.001) and TAO severity (OR = 0.742, p < 0.01). Conclusions: Eu-TAO patients are older and less likely to be female, and show more unilateral and milder clinical phenotypes than hyper/hypothyroid TAO patients. [ABSTRACT FROM AUTHOR]

Background: Several studies have demonstrated a correlation between subclinical hypothyroidism (SCH) and diabetic retinopathy (DR) with conflicting results. The study is aimed to find out the correlation and severity of DR with thyroid status. Materials and Methods: A cross-sectional study was conducted taking up 59 patients of DR and categorized them according to the severity of DR as per early treatment DR study classification. Thyroid stimulating hormone (TSH), free thyroxine (FT4), and FT3 concentration were measured in all 59 patients. Patients with normal TSH and FT4 values are euthyroid patients and those with normal FT4 but TSH >4.12 mIU/L is considered having SCH and those with FT4 4.12 mIU/L are considered having hypothyroidism. The severity of DR is compared between the euthyroid, subclinical hypothyroid, and hypothyroid groups. Results: Out of the 59 patients included in the study, 23 (38.98%) were females and 36 (61.01%) were males. Out of 59 cases of DR, 51 (86.44) cases were diagnosed with nonproliferative DR (NPDR) and 8 (13.56%) were diagnosed with PDR. Fifteen had thyroid dysfunction, SCH were seen in 13 patients, two patients had hypothyroidism, and 44 had euthyroid. Fifty-one patients of NPDR and SCH were seen in seven patients, and hypothyroid was present in two patients. In eight patients of PDR, six had SCH. Conclusions: In the present study, the prevalence of SCH among the patients of DR with type 2 diabetes mellitus (DM) was found to be 20.33%. The prevalence of severe NPDR and PDR was higher in patients with SCH compared to euthyroid patients. Therefore, SCH is associated with the severity of DR.

Objective: Pregnant women with autoimmune (subclinical) hypothyroidism have an increased risk of developing gestational diabetes mellitus (GDM). However, this association remains controversial in euthyroid women with thyroid autoimmunity (TAI). Therefore, the aim of the study was to determine the association between TAI and GDM in euthyroid women in a logistic regression analysis with adjustments for baseline/ demographic parameters. Methods: Cross-sectional study in 1447 euthyroid women who performed their entire clinical/biological workup and oral glucose tolerance test (OGTT) in our center. At median 13 (11–17) weeks of gestation, thyroid-stimulating hormone, free T4, and thyroid peroxidase antibodies (TPOAb) were measured, baseline characteristics were recorded, and an OGTT was performed between 24 and 28 weeks of pregnancy. Exclusion criteria were pre-pregnancy diabetes, assisted pregnancies, and women with (treated) thyroid dysfunction before or after screening. The diagnosis of GDM was based on 2013 World Health Organization criteria, and TAI was defined as TPOAb level s ≥60 kIU/L. Results: Two hundred eighty women were diagnosed with GDM (19.4%), 26.1% in women with TAI, and 18.9% in women without TAI (P = 0.096). In the logistic regression analysis, TAI was associated with GDM in women older than 30 years (adjusted odds ratio 1.68 (95% CI, 1.01–2.78); P = 0.048). Maternal age >30 years, pre-pregnancy BMI ≥30 kg/m2, and other than Caucasian background were also associated with GDM; aOR 1.93 (95% CI, 1.46–2.56); P < 0.001, 2.03 (95% CI, 1.46–2.81); P < 0.001 and 1.46 (95% CI, 1.03–2.06); P = 0.034, respectively. Conclusions: In older pregnant women, the presence of TAI in euthyroid women was associated with GDM. In line with the literature data, (higher) age and BMI were strongly associated with GDM. Future investigations should focus on treatments that might prevent the development of GDM in euthyroid women with TAI.

Objective: Impaired sensitivity to thyroid hormones has been reported as a common metabolic disorder, and it remains poorly understood whether it interplays with uric acid (UA) metabolism as an established risk factor for cardiovascular diseases (CVDs). We aimed to investigate the relationship between thyroid hormone sensitivity and elevated UA in a Chinese euthyroid population. Methods: A total of 15,955 euthyroid subjects were included in this study. Thyroid hormone sensitivity indices were calculated, including the thyroid feedback quantile-based index (TFQI), the Chinese-referenced parametric TFQI (PTFQI), the TSH index (TSHI), and the thyrotropin thyroxine resistance index (TT4RI), and the FT3/FT4 ratio. Linear and logistic regression analyses were performed to detect the association between thyroid hormone sensitivity and elevated UA. Results: Subjects with reduced sensitivity to thyroid hormones had increased UA levels in both genders (p for trend < 0.001). Logistic and linear regression analyses showed that higher TFQI, PTFQI, TSHI, and TT4RI were positively associated with elevated UA levels, but negatively associated with the FT3/FT4 ratio. The odds ratio (OR) of the highest versus the first quartile of TFQI was 1.20 (1.05, 1.38) in men and 1.80 (1.46, 2.23) in women (p < 0.001). PTHQI, TSHI, and TT4RI obtained similar results in both genders. Conversely, the highest quartile of the FT3/FT4 ratio was negatively correlated with elevated UA levels [men: OR 0.78 (0.68,0.89), women: OR 0.66 (0.53,0.81)]. Conclusion: Impaired sensitivity to thyroid hormones was associated with elevated UA levels in euthyroid subjects. Our findings shed light on the role of thyroid hormone sensitivity in UA metabolism. [ABSTRACT FROM AUTHOR]

Introduction: Hypothyroid or Hyperthyroid state affects all the physiological systems including cardiovascular system, central nervous system, digestive system, blood, etc. Despite increasing knowledge of thyroid physiology and better means for investigation of thyroid functions, we still are at preliminary stage of understanding the pathophysiology of these disorders Objectives: The present study was carried out to compare body T3, T4 and TSH levels in newly diagnosed patients of hypothyroidism, hyperthyroidism and age and gender matched euthyroid subjects Materials and methods: The present study was carried out in 90 female subjects in the age group of 30 to 45. Diagnosis of hypothyroidism and hyperthyroidism was based on both clinical and biochemical criteria. Subjects were divided in euthyroid, hypothyroid and hyperthyroid groups with each group containing 30 subjects. T3, T4 & TSH levels were measured in all the groups. Results: Hyperthyroid group had significantly higher T3 and T4 levels as compared to euthyroid and hypothyroid groups. Hypothyroid group had significantly higher TSH as compared to euthyroid and hyperthyroid groups. Conclusion: T3 and T4 levels are significantly higher in hyperthyroidism and they are significantly lower in Hypothyroidism as compared to euthyroid premenopausal women. TSH levels are significantly higher in hypothyroid subjects, while TSH levels are significantly lower in hyperthyroid subjects. Regular monitoring of T3, T4 and TSH especially in women is recommended. [ABSTRACT FROM AUTHOR]

The most prevalent endocrine illnesses worldwide are thyroid disorders. India is also no different. There are thought to be 42 million thyroid ailment sufferers in India, based on projections from numerous research on the condition. to investigate Kidney function in hypo-thyroid individuals at a tertiary medical facility. This cross-sectional investigation was conducted over a one-year period in 100 hypo-thyroid individuals at a Medical College and Hospital in Central India after receiving approval from the institutional ethical committee. The investigation includes similar euthyroid participants in addition to the diagnosed hypo-thyroidism individuals who provided consent. Both groups underwent the kidney function test, which included indicators such as creatinine clearance, creatinine urea, and uric acid, among others. Unpaired t-test statistics were computed using SPSS version 22 software. 49 -16%, 50-59 12%, and >60 10%. Women individuals made up 66% of the total population, with male individuals making up 24%. The Creatinine Clearance was considerably poorer in the hypo-thyroidism individuals compared to controls, measuring 102.08±9.98, 80.74±10.56 (P 0.001), Creatinine -0.82±0.102, 0.726±0.0456 (P 0.001), Urea -28.18±3.18, 21.82±3.01 (P 0.001), and Uric acid - 5.082±0.7614, 3.124±0.158 (P 0.001). According to the results of our investigation, the majority of hypo-thyroid individuals were women and in the age range of 30-39. They also demonstrated significantly abnormal kidney function tests, such as lower creatinine clearance and higher creatinine, urea, and uric acid levels in comparison to euthyroid individuals.

Introduction: Hypothyroidism, one of the most common thyroid gland disorders, can cause electrolyte disturbances in the body. Hypothyroidism can alter mineral metabolism by changing the levels of serum calcium and magnesium. Therefore, it is essential to study any abnormalities in calcium and magnesium metabolism in patients with hypothyroidism. Aim: The aim of this study was to assess the levels of calcium and magnesium in patients with hypothyroidism and to study the correlation between Thyroid Stimulating Hormone (TSH), fT3, and fT4 with calcium and magnesium in subclinical and Overt Hypothyroidism (OH). Materials and Methods: This cross-sectional study was held from August 2019 to January 2020 in the Department of Biochemistry, BS Medical College, Bankura. A total of 150 subjects were included in the study, distributed equally among three groups: euthyroidism, subclinical hypothyroidism, and OH. Serum TSH, fT3, fT4, calcium, and magnesium levels were determined in the laboratory, and the data obtained were statistically analysed using ANOVA test and Pearson's correlation test. Results: Out of a total of 150 subjects, 61 were female, among whom 23 had subclinical hypothyroidism and 21 had OH. There were significant differences in the mean levels of TSH, fT3, fT4, calcium, and magnesium between the SCH, OH, and euthyroid groups. The study showed that the mean serum calcium level was significantly lower in SCH and OH compared to euthyroids, while the level of serum magnesium was significantly increased in SCH and OH compared to euthyroid. There was a statistically significant negative correlation between TSH and serum calcium in both OH and SCH, while a statistically significant positive correlation was observed between TSH and serum magnesium levels in both groups. Conclusion: The present study revealed that serum magnesium levels were high while serum calcium levels were low in both subclinical hypothyroidism and OH when compared to euthyroid subjects. Additionally, calcium levels negatively correlated with TSH, while magnesium levels positively correlated with TSH levels. [ABSTRACT FROM AUTHOR]

Purpose: The objective of this study was to evaluate the association between thyroid hormone and bone mineral density (BMD) among euthyroid adults. Methods: This cross-sectional study researched the information from the National Health and Nutrition Examination Survey 2007–2010. We included 3,759 euthyroid participants finally. We used multivariate linear regression models to evaluate the linear relationship between the thyroid hormone profile and BMD. Subgroup analyses stratified by gender and age were further performed. Moreover, the nonlinear relationship was characterized by fitted smoothing curves and generalized additive models, and logistic regression models were used to determine the association of thyroidstimulating hormone (TSH) and thyroxine (T4) with previous fractures. Results: The weighted multivariable linear regression models showed no association between TSH and BMD. Free thyroxine (FT4), T4, free triiodothyronine (FT3), and total triiodothyronine (T3) were negatively associated with the total femur BMD and the total spine BMD after adjusting for all covariates. Subgroup analyses demonstrated that all groups had a negative association between T4 and BMD, even in patients with osteopenia/ osteoporosis. The nonlinear relationship characterized by smooth curve fittings and generalized additive models suggested that an obvious U-shaped, an inverted U -shaped, and an L - shaped curve was exhibited between thyroid hormone and BMD in the different subgroups. In addition, normal high-level T4 was associated with an increased prevalence of previous fractures than normal low-level T4. Conclusions: In this sample of euthyroid adults, T4 exhibits a negative correlation with BMD, regardless of age and gender, in subjects with either normal or lowered BMD. Moreover, high-normal FT4 was associated with an increased prevalence of previous fractures. TSH was not associated with variations of BMD and the fracture risk. [ABSTRACT FROM AUTHOR]

Background: Echocardiography is used to assess cardiac parameters. Altered parameters can affect the morbidity in patients of hypothyroidism so echocardiography can be used to assess morbidity in such cases. Aims and Objective: To measure cardiac functions in patients of hypothyroidism and to correlate cardiac functions with euthyroid state. Material and Methods: The study conducted at M.M.I.M.S.R, Mullana. Ambala. Fifty individuals were included in the study out of them 25 were cases and 25 were control. The patients were taken from both from OPD and Indoor wards of department of Medicine. The patients were studied during October 2014 to December 2016. All the patients were scrutinized and investigated as per the plan. All were subjected to evaluation by echocardiography. Results: In our study there was significant increase in left ventricular mass with preserved left ventricular systolic function. Conclusion: Echocardiography can be used as a sensitive tool to assess morbidity associated with hypothyroidism. [ABSTRACT FROM AUTHOR]

Background: Appropriate iodine intake for adults is essential to reduce the prevalence of thyroid diseases, but there is little research data on iodine requirement of Chinese population. This study aimed to explore the iodine requirement of young adults to maintain a healthy status based on 'overflow theory'.Methods: Iodine-balance experiment has been performed in this project. We conducted an 18-day study consisted of a 6-day acclimation period and 3 consecutive experimental stages in 37 Chinese healthy young adults (23 female and 14 male). Each stage was consumed for 4 days. Strictly-controlled low-iodine intake diets were provided for adults in the first period, an egg or 125mL milk was added in the second and third period, respectively. The dietary samples, 24-h urine specimens and faeces of volunteers were collected daily for assessment of iodine intake and excretion in volunteers.Results: Mean values of iodine intake (22.7±3.6, 35.1±3.7, and 52.2±3.8μg/d), excretion (64.7±13.9, 62.3±12.6, and 94.3±14.5μg/d) and iodine balance (-35.2±19.5, -21.0±19.8, and -33.5±26.9μg/d) were significantly different among three periods for male (P<0.001 for all); mean values of iodine intake (16.6±3.1, 29.7±2.7, and 48.0±2.7μg/d), and excretion (47.0±9.9, 55.5±8.1, and 75.7±12.4μg/d) were significantly different among three periods for female (P < 0.001 for all). No significant difference was observed among the 3 periods for female in the iodine balance (-30.5±9.3, -25.9±7.3, and -27.6±12.1μg/d). The linear regression equation of iodine excretion on iodine intake was Y=0.979X+37.04 (male) and Y=0.895X+31.48 (female). Compared with stage 2, iodine excretion increments in stage 3 had exceeded the iodine intake increment for men. The ratio of increment was 1.675 for male when the average iodine intake was 52.2μg/d in stage 3. When the iodine excretion increment equaled to the iodine intake increment, the daily iodine intake of men was 47.0μg.Conclusion: We have evaluated the iodine requirement of young adults in southern China based on overflow theory. Our results indicate the lower limit of iodine requirement for Chinese young men is 47.0μg/d. The trial was registered at www.chictr.org.cn as ChiCTR1800014877. [ABSTRACT FROM AUTHOR]

Abstract Background Appropriate iodine intake for adults is essential to reduce the prevalence of thyroid diseases, but there is little research data on iodine requirement of Chinese population. This study aimed to explore the iodine requirement of young adults to maintain a healthy status based on ‘overflow theory’. Methods Iodine-balance experiment has been performed in this project. We conducted an 18-day study consisted of a 6-day acclimation period and 3 consecutive experimental stages in 37 Chinese healthy young adults (23 female and 14 male). Each stage was consumed for 4 days. Strictly-controlled low-iodine intake diets were provided for adults in the first period, an egg or 125mL milk was added in the second and third period, respectively. The dietary samples, 24-h urine specimens and faeces of volunteers were collected daily for assessment of iodine intake and excretion in volunteers. Results Mean values of iodine intake (22.7±3.6, 35.1±3.7, and 52.2±3.8μg/d), excretion (64.7±13.9, 62.3±12.6, and 94.3±14.5μg/d) and iodine balance (-35.2±19.5, -21.0±19.8, and -33.5±26.9μg/d) were significantly different among three periods for male (P

Objective: To know the gender difference in the autoimmune profile that is anti TPO antibodies and thyroid profile in patients with hypothyroidism and in euthyroid controls. Study Design: Case Control study. Settings: Medical Out Door Department of Bahawal Victoria Hospital, Bahawalpur. Period: 01/09/2018 to 31/08/2019. Material & Methods: Case control study that was conducted after taking ethical approval from hospital ethical committee. After taking informed consent data was entered on a predesigned questionnaire and 5 ml of venous blood was taken for thyroid profile and anti TPO antibodies. Study population was selected by nonprobability sampling. A total 128 patients in which 69 in the hypothyroid group A and 69 in euthyroid control group were added. Results: Most of the anti TPO positive hypothyroid participants were females but TSH value was more in males. All euthyroid anti TPO participants were females. Female hypothyroid patients were young compared to males. Conclusion: Autoimmune thyroid disorders are more common in females, autoimmunity appears before biochemical failure of thyroid. [ABSTRACT FROM AUTHOR]

Background: In the euthyroid state, the risk of developing diabetes according to changes in thyroid‐stimulating hormone (TSH) levels remains controversial. Additionally, the correlation of various body indices affecting blood glucose levels according to changes in TSH levels over a certain period is not well known. Methods: Patients who underwent health check‐ups twice at a 2 year interval at a tertiary university hospital between 2009 and 2018 were included. By dividing baseline TSH levels into quartiles (TSH_Q1, Q2, Q3, and Q4), various variables were compared, and their changes after 2 years (∆TSH_Q1, Q2, Q3, and Q4) were confirmed. Results: Among 15 557 patients, the incidence of diabetes mellitus after 2 years was 2.4% (377/15 557 patients). There was no statistically significant difference in the incidence of diabetes according to TSH_Q (p = 0.243) or ∆TSH_Q (p = 0.131). However, as TSH levels increased, skeletal muscle mass decreased (p < 0.001), and body fat mass and percent body fat significantly increased (p < 0.001). As ∆TSH increased, ∆fasting blood glucose and ∆body mass index also significantly increased (all p < 0.001). The incidence of diabetes decreased significantly as skeletal muscle mass increased (odds ratio 0.734, p < 0.001). Conclusions: Owing to the short study period, it was not possible to prove a statistical relationship between the incidence of diabetes mellitus and TSH levels in the euthyroid state. Significant decreases in skeletal muscle mass and increases in body mass index and body fat mass according to baseline TSH levels were demonstrated. Therefore, a focus on improving physical functions, such as increasing muscle mass and decreasing fat, is required in this case. [ABSTRACT FROM AUTHOR]

Many studies have shown that socio-economic status (SES) contributes to health inequalities, with nutrition as one of the major risk factors. Iodine intake entirely depends on external sources, and deficiencies are known to be more prevalent in lower social groups, especially in countries with limited access to iodized salt. This study aimed to determine the influence of SES on iodine status and iodine availability from household salt in North Macedonia. Using cluster sampling, 1,200 children were recruited, and 1,191 children participated (response rate: 99.2%). Iodine status was assessed through urinary iodine concentration (UIC), and iodine availability through iodine content in household salt requested from participants. SES was assessed using standardized Family Affluence Score (FAS). No statistically significant correlation was found between FAS and iodine in salt. Median regression revealed no significant associations of middle vs. low FAS (β=0.00; 95%-confidence interval (CI)=[−0.61, 0.62]; p=0.999) or high vs. low affluence (β=0.48; 95% CI=[−1.37, 0.41]; p=0.291) with iodine content in household salt. UIC levels were significantly lower in middle FAS children compared to low FAS children (β=−16.4; 95% CI=[−32.3, −0.5]; p=0.043). No statistically significant differences in UIC were found between children with high and low affluence (β=−12.5; 95% CI=[−35.5, 10.5]; p=0.287), possibly due to lowered statistical power for this comparison. Universal salt iodization (USI) proves to be a cost-effective measure for appropriate iodine intake in healthy children and adults, irrespective of their social status. It can thus be concluded that USI contributes to reducing health inequalities related to iodine status among population of different social strata. [ABSTRACT FROM AUTHOR]

Context: Homocysteine (Hcy), a known risk factor for cardiovascular disease, has been reported to be linked with thyroid dysfunction. However, the association of thyroid hormones sensitivity with Hcy levels remains unknown. Objective: We aimed to investigate the relationship between thyroid hormone sensitivity and elevated Hcy levels in the euthyroid population. Methods: A total of 8957 euthyroid adults were included in this study. Free triiodothyronine (FT3), free thyroxine (FT4), thyrotropin (TSH), Hcy levels, and other clinical parameters were measured. Hyperhomocysteinemia (HHcy) was defined as serum Hcy level > 15 μmol/L. Thyroid hormone sensitivity indices were calculated by thyroid feedback quantile-based index (TFQI), Chinese-referenced parametric TFQI (PTFQI), TSH index (TSHI) and thyrotropin thyroxine resistance index (TT4RI). Results: Subjects with decreased sensitivity to thyroid hormones had higher Hcy levels (P for trend < 0.001). Logistic regression analysis revealed the higher quartiles of TFQI, PTFQI, TSHI, and TT4RI were significantly associated with elevated Hcy levels, and these associations remained significant even after adjustment for multiple risk factors. After adjusting for age, sex, body mass index, dyslipidemia, fatty liver, diabetes, and hypertension, the odds ratio (95% CI) for having HHcy of the TFQI in the highest quartile was 1.393 (1.210, 1.603), the PTFQI in the highest quartile was 1.409 (1.225, 1.621), the TSHI in the highest quartile was 1.372 (1.190, 1.583), and the TT4RI in the highest quartile was 1.315 (1.141, 1.515) (all P < 0.001). Conclusion: In euthyroid subjects, impaired sensitivity to thyroid hormones was associated with elevated Hcy levels. [ABSTRACT FROM AUTHOR]

Aims: Thyroid hormones impact lipid metabolism and glucose homoeostasis through both central and peripheral regulation; however, little research has delved into the association between thyroid hormone sensitivity and metabolically obese phenotypes. We aimed to investigate the correlation between indices of central and peripheral sensitivity to thyroid hormones and metabolically obese phenotypes in euthyroid Chinese adults., Methods: This cross-sectional study included 20,084 euthyroid individuals. Central thyroid hormone sensitivity was assessed using the thyroid feedback quantile-based index (TFQI), parametric thyroid feedback quantile-based index (PTFQI), thyroid-stimulating hormone index (TSHI), and thyrotropin thyroxine resistance index (TT4RI), while peripheral thyroid hormone sensitivity was measured by FT3/FT4. Metabolically obesity phenotypes included metabolically healthy non-obesity (MHNO), unhealthy non-obesity (MUNO), metabolically healthy obesity (MHO), and unhealthy obesity (MUO). Multinomial logistic regression and restricted cubic spline analyses were conducted to investigate the association between thyroid hormone sensitivity indices and metabolically obese phenotypes risk. Subgroup analysis was also performed to examine this association stratified by sex and age. Mediation analysis was performed to estimate direct and indirect effects of BMI., Results: Prevalence of MHNO, MUNO, MHO and MUO was 66.1% (n = 13,273), 21.3% (n = 4271), 5.3% (n = 1055), and 7.4% (n = 1485) respectively. After adjustment for potential confounders, the odds ratios (ORs) (95% CI) for MUNO and MUO were increased with all elevated thyroid hormones sensitivity indices (per SD increase) [MUNO: TFQI 1.14(1.09-1.19), PTFQI 1.18(1.23-1.23); TSHI 1.26(1.19-1.33), TT4RI 1.41, (1.31-1.53), FT3/FT4 1.20(1.14-1.25) and [MUO: TFQI 1.20(1.11-1.31), PTFQI 1.26(1.16-1.37), TSHI 1.39 (1.26-1.54), TT4RI 1.70(1.48-1.95), FT3/FT4 1.26 (1.16-1.37)] (p value < 0.001), and only TSHI and TT4RI (per SD increase) significantly increased the risk of MHO (TSHI: OR = 1.12, 95% CI 1.01-1.24; TT4RI: OR = 1.25, 95%CI 1.08-1.4) (p value < 0.05). Non-linear relationships were observed between central thyroid hormones sensitivity indices and MUNO and MUO(p for nonlinearity  < 0.05). Conversely, a linear relationship between FT3/FT4 and metabolically obese phenotypes was noted in all subjects (p for nonlinearity  > 0.05). Besides, subgroup analysis indicated that this association remained consistent among sex and age (p for interaction  > 0.05). The proportions mediated by BMI on the association of TFQI, PTFQI, TSHI, TT4RI, FT3/FT4 and risk of metabolically unhealthy conditions were 13.73%, 25.38%, 22.75%, 17.94% and 62.28%, respectively., Conclusions: In euthyroid adults, central and peripheral sensitivity to thyroid hormones indices are positively associated with metabolically obese phenotypes risk, especially MUNO and MUO phenotypes., (© 2024 John Wiley & Sons Ltd.)

Background: Associative learning deficits are constantly found in subclinical hypothyroidism (SCH). Despite achieving normal thyroid stimulating hormone (TSH) levels, a considerable number of patients undergoing levothyroxine (LT-4) treatment frequently complain about memory retrieval. The Paired Association Learning (PAL) task involves computerised testing on the CANTAB- Cambridge Neuropsychological Test Automated Battery, also considered a screening tool for Alzheimer's disease (AD)., Purpose: This study aimed to investigate the impact of different levels of TSH on visual associative learning in SCH and determine if these impairments were reversed with LT-4., Methods: A total of 134 participants were included in this cross-sectional study. Group 1: 35 healthy controls; patients with SCH (Group 2: 33 newly identified cases; Group 3: 32 patients on LT-4 with elevated TSH; Group 4: 34 euthyroid but on LT-4). A thyroid profile and a neuropsychological clinical assessment were done. The visual PAL task was performed on CANTAB., Results: PAL was significantly impaired (p = <0.05) in all 3 patient groups as compared to Group 1. The PAL total errors (adjusted) scores were significantly higher in Groups 2 and 3, indicating that associative learning is definitely impaired in SCH, reaching levels previously seen in patients with AD., Conclusion: Our findings encourage screening for visual associative learning or memory retrieval in patients with SCH. The study present has established a more reasonable threshold of TSH 2.5mIU/L to encourage examination of associative learning and the initiation of LT-4 in SCH. Poor PAL task performance in patients with SCH may have significant implications in clinical settings for suspecting AD., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)

Subclinical hypothyroidism and thyroid autoimmunity in pregnancy are common conditions. They are both associated with adverse maternal and offspring outcomes. Women with thyroid autoimmunity should be monitored with regular thyroid function tests preconception and during gestation to identify women who develop hypothyroidism. The effectiveness of thyroid hormone treatment in reducing adverse outcomes in pregnancy has been studied in a number of randomized controlled trials. Current evidence shows obstetrical benefits of levothyroxine treatment in pregnant women with a thyroid-stimulating hormone level greater than 4 mU/L., Competing Interests: Disclosure The authors have nothing to disclose., (Copyright © 2024 Elsevier Inc. All rights reserved.)