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Autoimmune thyroid disease and thyroid autoantibodies in rheumatoid arthritis patients and their families.

All 504 available members from 58 multicase rheumatoid arthritis (RA) families were interviewed and examined for the presence or history of autoimmune thyroid disease and were tested serologically for thyroid autoantibodies. The serological data were compared with those from a major population survey which used the same assay methods. Overall, 6% had thyroid disease with a fivefold female excess. Thyroglobulin antibodies were present in 5% of males and 11% of females and thyroid microsomal antibodies in 5% of males and 15% of females. These rates were all significantly greater than published rates for the general population. The differences persisted after analysing separately by age group. The results confirm the suggestions by others that there may be a common genetic link between RA and autoimmune thyroid disease.

Arthritis, Rheumatoid↗

Serum calcium in thyroid disease.

Thyroid hormones are believed to influence calcium metabolism. In the present prospective study we investigated the influence of various thryroid diseases on serum calcium levels. In addition to screening for thyroid diseases we measured serum calcium concentrations (S-Ca) in individuals who came to our outpatient service for thyroid diseases from 1992 to 1998. 13,387 persons, among them 9017 patients with thyroid diseases and 4370 persons without thyroid dysfunction, were studied. S-Ca was found to be higher in patients with hyperthyroidism (2.36 +/- 0.11 mmol/L n = 1201, p < 0.05) than in those with subclinical hyperthyroidism (2.33 +/- 0.11 mmol/L, n = 494), with euthyroid goiter (2.32 +/- 0.10 mmol/l, n = 5599), with hypothyroidism (2.31 +/- 0.11 mmol/L, 344), with subclinical hypothyroidism (2.32 +/- 0.10 mmol/L, n = 1290) and in healthy persons (2.31 +/- 0.11 mmol/L, n = 4370). 173/13,387 persons had serum calcium levels < 2.1 mmol/L, among them 31 patients with hypoparathyroidism after strumectomy (31/592) and 2 patients with primary hypoparathyroidism. 106/13,387 persons showed a S-Ca of > 2.6 mmol/L, which in 30 cases was due to primary hyperparathyroidism. Of 55 persons with S-Ca of > 2.6 mmol/L and without any other reason for hypercalcaemia, 31 were found to be in a hyperthyroid state. In conclusion, a clinically not relevant influence on S-Ca was demonstrated in patients with hyperthyroidism as compared with other thyroid diseases and individuals with no thyroid diseases. Measurement of S-Ca in every patient being referred to a thyroid outpatient department is recommended because of the frequent occurrence of postoperative hypoparathyroidism and primary hyperparathyroidism in this setting.

Adolescent↗

Ultrasonography of the thyroid gland in pregnancies complicated by autoimmune thyroid disease.

Thyroid function and ultrasonographically determined thyroid volume were studied in nine pregnant women with diagnosed autoimmune thyroid disease at regular intervals during pregnancy and two months after delivery. The results were compared to the findings in ten healthy pregnant women. In ultrasound examinations seven of the patients showed definite morphological changes such as hypoechogeneity and inhomogeneity of the thyroid gland, which did not change during the course of pregnancy nor during the post-partum period of eight weeks. There were no morphological changes in the thyroid glands of the control group. The mean thyroid volume did not significantly change during pregnancy and after delivery in both the patient group and controls. The mean thyroid volume was smaller in the study group, with 7.55 ml (SD 6.01) compared to the controls with 11.29 ml (SD 5.61), a difference which was not statistically significant. Neither course of pregnancy nor fetal outcome was influenced by inactive autoimmune disease of the thyroid.

Adult↗

A longitudinal assessment of bone loss in women with levothyroxine-suppressed benign thyroid disease and thyroid cancer.

To determine if differing degrees of levothyroxine (LT4) suppression therapy for benign and malignant thyroid disease are associated with proportionately increased rates of bone loss, this longitudinal assessment of bone densitometry changes (single-photon and dual-photon absorptiometry) was conducted in three groups of subjects: 24 thyroid cancer patients who were treated with near-total thyroidectomy, radioiodine ablation, and aggressive LT4-suppression; 44 patients who were treated with more conservative LT4-suppression for benign thyroid disorders; and 24 normal controls. Bone densitometry values were adjusted for age, weight, height, and menopausal status. The rates of bone loss in benign LT4-suppressed patients were greater than those in controls at the midradius, distal radius, lumbar spine, and femoral neck. The rates of loss in the thyroid cancer patients were also greater than those in the controls at all four sites and greater than in the benign LT4-suppressed patients at the midradius, distal radius, and femoral neck but not in the lumbar spine. Rates of bone loss were not significantly correlated with LT4 dose or with the serum level of T4 or TSH. LT4-suppression therapy for benign thyroid disease is associated with accelerated bone loss. More aggressive LT4-suppression for thyroid cancer is associated with even greater bone loss, particularly in cortical bone regions. These risks must be weighed against the benefits of LT4 therapy in individual patients.

Bone Density↗

Pathologic and immune factors in thyroid disease.

Thyroid glands from 33 children with hyperthyroidism and nine with juvenile lymphocytic thyroiditis were examined histologically and for IgG, IgA, IgM, and C3 by immunofluorescent staining. There was no significant difference between glands with JLT and those with hyperthyroidism in the degree of lymphoid infiltration or lymphoid follicle formation. In thyroiditis there was no correlation between the degree of histologic abnormalities and the presence of immunofluorescent staining for IgG, IgM, or IgA. In hyperthyroidism there was a correlation between the degree of histologic abnormalities and the presence of IgG. In both groups of patients LI and LFF were distinctly more severe in glands positive for C3. Postsurgical hypothyroidism correlated with LI but not with LFF, IgG, or C3.

Adolescent↗

The association between Alzheimer's disease and thyroid disease in Rochester, Minnesota.

To determine whether an association exists between Alzheimer's disease (AD) and thyroid disease, we carried out two studies in the population of Rochester, Minnesota. We reviewed medical records of a cohort of 198 women with histologically confirmed Hashimoto's thyroiditis (1935 to 1974) for evidence of subsequent dementia, applying the criteria used for dementia in a previous determination of incidence and prevalence rates in this population. From a total of 4,197 person-years of follow-up, eight cases of AD were diagnosed, whereas the expected number was 5.8. The standardized morbidity ratio was 1.37, which failed to reach statistical significance. The second study was a retrospective case-control comparison that sought any relationship between AD and all thyroid disorders, using a previously identified (1960 to 1979) AD cohort (N = 646) and their age- and sex-matched controls. For myxedema there was a positive association for AD without significance, whereas in Graves' disease there was a significant negative association for AD.

Adolescent↗

Dermatologic aspects of thyroid disease.

Thyroid disorders commonly have dermatologic manifestations. The purpose of the present chapter is to review and emphasize potential clinical dermatologic findings that can occur with Graves' disease, hypothyroidism and thyroid cancer. In autoimmune diseases such as Graves' disease and Hashimoto's thyroiditis the skin manifestations may be related to either thyroid hormone levels themselves or to the associated T and/or B cell abnormalities. Thyroid cancer may be associated with various syndromes that could have significant skin manifestations.

Autoimmune Diseases↗

Simultaneous occurrence of inflammatory bowel disease and thyroid disease.

We report a case of simultaneous occurrence of inflammatory bowel disease (IBD) and Graves' disease. A review of reported cases of simultaneous onset of ulcerative colitis (UC) and autoimmune hyperthyroidism is presented. A discussion of the prevalence of thyroid disease in patients with UC and possible common autoimmune etiology is entertained. The concurrent presentation has implications for the diagnosis and treatment of both diseases. At the time of suspected initial presentation or exacerbation or preexisting IBD, we emphasize the need to consider both IBD and thyroid disease in the differential diagnosis for optimal patient management.

Adult↗

Skin disorders and thyroid diseases.

Thyroid disorders have a high prevalence in medical practice; they are associated with a wide range of diseases with which they may or may not share etiological factors. One of the organs which best show this wide range of clinical signs is the skin. This review is an attempt to approach most of the dermopathies reflecting several degrees of harmfulness, coming directly or indirectly from thyroid abnormalities, as well as to update current knowledge on the relationship between the thyroid and skin. We have proposed a primary classification of skin disorders, regarding thyroid involvement, into two main groups: 1) dermopathies associated with thyroid abnormalities, mainly with autoimmune thyroid diseases, like melasma, vitiligo, Sjogren's syndrome, alopecia, idiopathic hirsutism, pre-menstrual acne, bullous diseases, connective tissue diseases, hamartoma syndrome, atopy, leprosy and DiGeorge anomaly; and 2) dermopathies depending on the nature of the thyroid disorder, in which the evolution and outcome of the skin disorder depend on the thyroidal treatment in most cases, such as trophism and skin blood flow, myxedema, alopecia, onychodystrophy, hypo- and hyperhidrosis, xanthomas, intraepidermal bullae, carotenodermia, pruritus, flushing, pyodermitis, palmoplantar keratoderma, ecchymosis, etc. In some other cases, the skin disease which developed as a consequence of the thyroid abnormality can remain unaltered despite functional treatment of the thyroid problem, such as pretibial myxedema, thyroid acropachy and some cutaneous manifestations of multiple endocrine neoplasia types 2A and 2B.

Humans↗

Thyroid abnormalities in dermatitis herpetiformis. Prevalence of clinical thyroid disease and thyroid autoantibodies.

We studied thyroid abnormalities in 50 patients with dermatitis herpetiformis. Two patients had a history of hyperthyroidism, and 5 had hypothyroidism and were on thyroid replacement therapy. Three patients had had thyroidectomies for nodules, and 5 had asymptomatic goiter. Two patients were clinically euthyroid with elevated thyrotrophin and low normal thyroxine levels, indicating early thyroid insufficiency. Thyroid microsomal antibodies were seen in 38% of patients with dermatitis herpetiformis compared to 12% of controls. The presence of clinical or serologic thyroid abnormalities in 26 of 50 patients shows a significant but unexplained association between dermatitis herpetiformis and thyroid disease.

Adolescent↗

[Inflammatory thyroid diseases].

Thyroiditis are common causes of the goitrous enlargement of the thyroid, and comprise a number of inhomogeneous disorders. The only criterion they have in common is an inflammatory infiltration of thyroid tissue. The following diseases belong to this group: Hashimoto's thyroiditis, thyroiditis de Quervain, acute thyroiditis, Riedel's thyroiditis and rare forms of thyroiditis. These diseases are reviewed with regard to incidence, etiology, pathogenesis, clinical features, diagnosis and treatment.

Biopsy, Needle↗

[Osteoporosis in thyroid diseases].

Thyroid hormones play the essential role in the regulation of metabolism and bone remodeling in physiological conditions and in the course of thyroid dysfunction. Introduction of densitometry to the diagnostics of osteoporosis has made possible the evaluation of influence of both hyperthyroidism and hypothyroidism and their treatment on bone mineral density. Moreover it became possible to estimate the influence of treatment with exogenous thyroid hormones on the skeletal system. Authors presented mechanisms of the thyroid hormones action on bone tissue and analysed current state of knowledge concerning the influence of the thyroxine treatment with replacement and suppressive doses on the bone mineral density. The influence of thyroid hormones on the skeletal system with respect to premenopausal and postmenopausal period was also discussed. Great discrepancies in literature data and its reasons were underlined.

Age Factors↗

Thyroid stimulating hormone receptor antibody in thyroid diseases.

Thyroid stimulating hormone receptor antibody (TRA) was estimated as a measure of TSH binding inhibitory immunoglobulin (TBII) in 48 persons. These included (i) 14 controls; (ii) 23 patients with Graves' disease who were tested for TRA within 3 months of commencing treatment with carbimazole of which 13 were studied serially; (iii) 5 patients with toxic nodular goitre; (iv) 4 with euthyroid exophthalmos; and (v) 2 neonates of thyrotoxic mothers. TRA was measured with an RIA system, while total thyroxine (T4), free thyroxine concentration (FTC) and TSH were also estimated along with TRA. All controls showed undetectable TRA levels; 87 per cent of patients with Graves' disease were TRA positive within 3 months of starting carbimazole therapy. In the serial study, 5 patients with Graves' disease who had undetectable TRA initially remained so while on treatment. Seven out of the remaining 8 patients showed a decline of TRA levels to normal over 3 to 18 months. This decline coincided with clinical and biochemical recovery.

Adult↗

Optimized dose planning of radioiodine therapy of benign thyroidal diseases.

Thyroid uptake measurements were performed on 246 patients, who underwent radioiodine therapy for benign disease up to 192 hr after oral application of either the test activity (7 MBq) or the therapeutic activity (150-1100 MBq). Using the complete set of uptake values, the cumulated activity in the thyroid was calculated and the dose-to-activity ratio (D/A) deduced. An empiric factor was derived, which allows prediction of the D/A with high precision, using only the late uptake measurement at 96 hr or 192 hr. The correlation between the value calculated from the complete set of uptake values and that of only one at 96 hr or 192 hr was R = 0.99 and 0.97, respectively. The activity required for intended dose can thus reliably be determined by a single, late uptake measurement. In a second analysis, the correlation between the D/A of the test and the therapeutic activity was established. There were two essential findings: For those patients who were without or under stable thyroid-specific medication there was a strong correlation between the two D/A values. The therapeutic value was on the average approximately 15% lower than the test ratio, which is assumed to be due to an enhanced iodine turnover under therapeutic conditions. In patients whose medication changed close to the test study or therapy, the measured test and therapeutic D/A were strongly noncorrelated.

Dose-Response Relationship, Radiation↗

[Intrathyroidal T cell activation and HLA-DR antigen expression on thyroid follicular cells in autoimmune thyroid diseases].

Thyroid specimens from 19 patients with Hashimoto's thyroiditis (HT), 11 with Graves' disease (GD), 4 with nontoxic goiter (NTG), 1 with subacute thyroiditis (SAT), 1 with thyroid adenoma and 4 from normal thyroids were investigated by alkaline phosphatase anti-alkaline phosphatase (APAAP) immunocytochemical technique. A group of monoclonal antibodies against the corresponding T cell activation antigens were used. The positive rates of all the four activation antigens in thyroid gland mononuclear cells (TG-MNC) were significantly higher in HT than in NTG (P less than 0.05-0.01). However, the differences between HT and GD were insignificant (P greater than 0.05) except for HLA-DR antigen. The activation antigen-positive (especially TLiSA 1+) TG-MNC were often seen intruding into thyroid lumens of HT. All the abnormal specimens expressed HLA-DR antigens on thyroid follicular cells (TFC) in different degrees (+/- to +3), and the degree in HT was significantly higher than that in GD (P less than 0.01) or NTG (P less than 0.05). The level of DR expression on TFC correlated significantly with the infiltrating degrees of T-activation-antigen-positive cells (P less than 0.01). This indicates that aberrant DR expression in vivo is closely related to the activation of intrathyroidal T cells.

Adult↗

Thyroglobulin: current aspects of its role in autoimmune thyroid disease and thyroid cancer.

Thyroglobulin (Tg) is a large glycoprotein (molecular weight: 660000) with 2 polypeptide chains of approximately 2768 amino acids each. It functions both as a pro-hormone and storage hormone for thyroid hormones. The complete Tg gene sequence has been determined for human, rat and bovine species. Tg is one of the thyroid autoantigens recognised in patients with autoimmune thyroid disease (AITD). Antibodies to Tg (TgAb) are present in the serum of patients with AITD and are also sometimes present in healthy euthyroid subjects. Though at least 40 antigenic epitopes on human Tg have been identified, only 2 or 3 of these bind TgAb. Epitope mapping studies suggest that TgAb in AITD patients express a restricted binding pattern while TgAb in the serum of healthy individuals do not show such specific binding. There is evidence to suggest that iodination of Tg may alter these epitope binding patterns. TgAb IgG on the other hand, do not appear to be subclass restricted. Several Tg fragments capable of inducing a T-cell response have been described. Tg is routinely used in the postoperative monitoring of patients with differentiated thyroid cancer. Its use has been limited by problems with assay methods which include poor inter-laboratory standardisation, poor inter-assay variation, low functional sensitivity of the assays, hook effects, and interference from TgAb present in patients serum. The use of rh-TSH in stimulating Tg prior to testing has improved the sensitivity of Tg values in the suppressed state.

Autoantibodies↗

Thyroid disease and abnormal thyroid function tests in women with eating disorders and depression.

Forty-two female patients with an eating disorder and major depression were compared with 48 female patients with major depression in a retrospective chart study for the prevalence of thyroid disease and laboratory thyroid function abnormalities in the absence of thyroid disease. Eating disorder patients, aged 30-80 years, had a significantly higher incidence in thyroid diseases (53%) then those with major depression alone (17%). The incidence of thyroid disease did not differ between the two groups among patients aged 11-29 years. Abnormal thyroid screening values occurred in 40% of euthyroid eating disorder patients and 34% of those with major depression. While the overall prevalence of thyroid disease in depressed females (15%) was similar to that in the general population (10.5%), thyroid disease in the eating disordered/depressed patients was twice the rate expected (24%) in the general population. Female patients who require psychiatric hospitalization should be routinely evaluated for thyroid function, especially those diagnosed with an eating disorder and depression.

Adolescent↗