Prevalence of Hyponatremia in Hypothyroid Patients during Radioactive ¹³¹I Ablation for Differentiated Thyroid Cancer: Single Institution Experience.

BACKGROUND: Hyponatremia developing in hypothyroid patients has been encountered in clinical practice; however, its prevalence has not been well established. METHODS: Thirty patients diagnosed with differentiated thyroid cancer, rendered hypothyroid after surgery and levothyroxine withdrawal, and who are for radioactive iodine (RAI) ablation were included. Serum sodium concentrations were measured twice, at the time of admission for RAI ablation, and before discharge after increased oral fluid intake. The outcome measures were to determine the prevalence of hyponatremia among hypothyroid patients prior to RAI ablation and after oral hydration post-RAI, and to correlate the serum sodium levels pre-RAI and post-RAI with thyroid-stimulating hormone (TSH) concentration and age. RESULTS: Thirty patients were included, with ages from 23 to 65 years old (median, 40). Two patients (6.7%) were hyponatremic prior to RAI ablation, and eight patients (26.7%) had mild hyponatremia (130 to 134 mEq/L) after RAI and hydration. There was no significant correlation between TSH levels and serum sodium levels prior to or after RAI. There was also no significant correlation between pre- and post-RAI sodium concentration and age. CONCLUSIONS: The prevalence of hyponatremia pre-RAI was 6.7%, and 26.7% post-RAI. No significant correlation was noted between TSH concentration and age on pre- or post-RAI sodium concentrations. Routine measurement of serum sodium post-RAI/isolation is still not advised. Measurement of sodium post-RAI may be considered in patients who are elderly, with comorbid conditions or on medications.

Prevalence of diabetes mellitus and pre-diabetes in the Philippines: A sub-study of the 7th National Nutrition and Health Survey (2008)

INTRODUCTION: Diabetes mellitus is rapidly increasing worldwide but the greatest increase is expected in developing countries including the Philippines. It is of public health concern to monitor countrywide prevalence of diabetes as it leads to significant cardiovascular-related mortality as well as significant complications such end stage renal disease, blindness, lower leg amputations and blindness.METHODOLOGY: This is a national survey to estimate the prevalence of diabetes and pre-diabetes using the criteria of the World Health Organization through a stratified multi-stage sampling design representing each of the 17 regions in the country.RESULTS AND DISCUSSION: The national prevalence of diabetes in the year 2008 was 7.2% (6.5-7.9); impaired glucose tolerance 7.0% (6.1-7.8) and impaired fasting glucose was 2.2% (2.2-3.1). There was a greater prevalence of individuals with diabetes in the urban areas at 8.5% (7.5-9.5) compared to the rural areas at 5.7% (4.6-6.8). Diabetes is slightly more preponderant among females at 7.4% (6.4-8.3) compared to males at 7.0% (6.1-8.0).CONCLUSION: The prevalence of diabetes mellitus in the Philippines is rising with the prevalence in 2008 at 7.2%. The prevalence of pre-diabetes exceeds that of diabetes mellitus at approximately 10.2%.

A randomized double-blind comparison of fixed versus calculated radioiodine dose in the treatment of Graves' hyperthyroidism

INTRODUCTION:Radioactive iodine(I131) therapy is an established definitive treatment for Graves' hyperthyroidism.However,the optimal method of determining the radioiodine treatment dose remains controversial.OBJECTIVE: To compare the efficacy of fixed dose versus  calculated  dose  regimen  in  the  treatment  of  Graves'  hyperthyroidism  among  Filipinos  METHODOLOGY: Diagnosed   Graves'   disease   patients underwent  thyroid  ultrasound  to  estimate  thyroid  size. Patients  were  randomized  to  either  fixed  or  calculated dose  of  radioiodine  treatment.  For  fixed  dose  group,the  WHO  goiter  grading  was  utilized:  Grade   0   (5mCi),  Grade   1  (7mCi),  Grade2  (10mCi),  Grade  3  (15mCi).  For calculated  dose  group  the  following  formula  was  used:                    Dose(mCi)= 160uCi/g thyroid x thyroid gland weight in grams x 100  /  24-hour RAIU(%)Thyroid function test (TSH,FT4)  was monitored every  three  months  for  one  year.  RESULTS: Of  the  60  patients  enrolled,  45  (fixed  dose;  n= 27,  calculated  dose;  n=  18)  completed  the  six  months follow-up  study.  Analysis  was  done  by  application  of  the  intention-to-treat  principle.  The  percentage  failure  rate  at  third  month  in  the  fixed  vs.  calculated  dose  group  was:  26  v.  28%  with  a  relative  risk  (RR)  value  of  0.93.  At  six  months  post-therapy,  there  was  a  noted  reduction  in  the  failure  rates  for  both  study  groups  (11  vs.  22%,  respectively),  with   a   further   reduction   in   the   relative   risk   value (0.67),  favoring  the  fixed  dose  group.CONCLUSION: Fixed   dose   radioiodine   therapy   for Graves'   disease   is   observed   to   have   a   lower   risk   of   treatment   failure   (persistent   hyperthyroidism)   at   three  and  six  months  post-therapy  compared  to  the calculated  dose.

The Philippine thyroid diseases study (PhilTiDeS): Prevalence of thyroid disorders among adults in the Philippines / Journal of the ASEAN Federation of Endocrine Societies

BACKGROUND:The national prevalence of goiters in the Philippines was 3.7% in 1987 and 6.7% in 1993. Since then, there has been no follow-up survey on goiter prevalence, nor has there been any national survey on the prevalence of abnormal thyroid dysfunction. The PhilTiDeS is a survey on the prevalence of both goiters and thyroid disorders in the Philippines.OBJECTIVES:To determine the prevalence of various categories of abnormal thyroid dysfunction among the Filipino non-pregnant adult population and to describe the prevalence of thyroid enlargement in the Philippines in relation to thyroid dysfunction status.MATERIALS AND METHODS:The PhilTiDes was a substudy of the 2008 National Nutrition and Health Survey (NNHeS), which covered all 17 regions and 80 provinces of the Philippines. It included all Filipino adults 20 years and older, who are non-pregnant and non-lactating. A standard questionnaire was used to collect data on previous diagnosis and current treatment for thyroid disorders, and neck examination by trained field personnel was done to assess the presence of goiter. Blood was extracted, processed and sent to an accredited laboratory for free T4 and TSH testing using micro-particle enzyme immunoassay.RESULTS: A total of 4897 persons had thyroid function tests. Of these, 417 (8.53%) had thyroid function abnormalities with the most common abnormality being subclinical hyperthyroidism occurring in 5.33%. The other categories had the following prevalence: true hyperthyroidism 0.61% ; true hypothyroidism 0.41%; and subclinical hypothyroidism 2.18%. Majority of the population 4480 (91.47%) had normal thyroid function tests. Of those with subclinical hyperthyroidism, 55% are females with mean age of 48 years (95% CI 45.9-50.1 years) compared with the volunteers with normal thyroid function who were younger (mean age of 43.1, 95% CI 42.5-43.6 years). Out of the 7,227 volunteers who responded to the survey and clinical examination, a total of 674 (8.9%) had goiters. Out of the 674 subjects with goiters, 379 had diffuse enlargement (56%) while the rest had nodular goiter (44%). Among the sub-population (n= 4897) who underwent thyroid function testing, 9% of those with normal thyroid function tests have goiters.CONCLUSION: The prevalence of thyroid function abnormalities in the Philippines is 8.53% with the greatest proportion of volunteers having subclinical thyroid disease. There is a low prevalence of both true or overt hyperthyroidism and hypothyroidism. In the larger survey, it was found that 8.9% of volunteers who were examined had goiters. The etiology of these goiters will need to be ascertained in future studies.

Validation of the UST thyroid scoring index against ultrasensitive assays for thyroid-stimulating hormone and free thyroxine

BACKGROUND: Clinical manifestations of thyroid dysfunction are variable. The UST Scoring Index for thyroid disorders, formulated in the 1990s to evaluate thyroid functional status, was based on total thyroid hormone levels and thyroidal iodine uptake. However, with the advent of newer and more sensitive tests, the recommendations and practice now dictate the use of thyrotropin (TSH) and free thyroxine (FT4) levels in the confirmation of thyroid dysfunction.OBJECTIVE: To validate the UST Scoring Index for thyroid disorders using TSH and FT4.METHODS/RESULTS: The UST Clinical Scoring Index was administered to 170 patients presenting for thyroid-relatedcomplaints. Thyroid function tests were then requested (TSH and Free T4) and they were classified according to biochemical status. We obtained the following: 43 hyperthyroid, 102 euthyroid and 25 hypothyroid subjects. The mean TSH for the 3 groups were 0.08, 1.28, and 41.50 uIU/mL respectively (NV 0.27-3.75.) Mean FT4 levels were 36.18, 18.33, and 8.43 pM/L respectively (NV 10.3-25.0.) The most frequent findings in the biochemically hyperthyroid group were thyroid enlargement (88%), easy tiredness (74%), palpitations (70%), and nervousness (65%); in the euthyroid group, easy tiredness (62%), thyroid enlargement (54%), palpitations (53%), and irritability (49%); in the hypothyroid group, easy tiredness (64%), exertional dyspnea (52%), weight gain (44%), and constipation (44%.) The UST scoring index for thyroid disorders has a sensitivity of 67%, specificity of 84%, and accuracy rate of 80 %, with AUC of 0.850 on ROC analysis for the detection ofhyperthyroidism. For detecting hypothyroidism, it has a sensitivity of 40%, specificity of 92%, and asccuracy rate of 85%, with AUC 0.7553 on ROC analysis.CONCLUSION: The UST scoring index for thyroid disorders has good sensitivity, specificity and accuracy rate based on ROC when validated using TSH and FT4 for the detection of hyperthyroidism and hypothyroidism.

Cushing's disease after surgical resection and radiation therapy for nonfunctioning pituitary adenoma.

OBJECTIVE: To describe a patient with an aggressive nonfunctioning pituitary adenoma in whom Cushing's disease developed after two resections of tumor and radiation therapy. METHODS: We present a case report, with serial laboratory and immunohistochemical data, and summarize information about similar patients described in the medical literature. RESULTS: A 48-year-old woman had irregular menstrual periods, decreased peripheral vision, headaches, and weight gain. Laboratory and radiologic investigation revealed a large nonfunctioning pituitary adenoma. Transsphenoidal subtotal resection of the tumor improved her vision. Results of immunohistochemical studies were positive for b-follicle-stimulating hormone and b-luteinizing hormone. She had radiation therapy 1 year postoperatively for rapidly enlarging residual tumor. Bifrontal craniotomy was done 3 months later because of worsening vision. The pituitary adenoma from the second surgical procedure stained negatively for all pituitary hormones. Postoperatively, she received tapering doses of prednisone for 4 months. Two months after the last dose of prednisone, she had signs and symptoms of hypercortisolism. Inferior petrosal sinus venous sampling studies for plasma corticotropin confirmed the presence of Cushing's disease. She did not tolerate medical therapy. Bilateral adrenalectomy led to remission of hypercortisolism. CONCLUSION: Nonfunctioning pituitary tumors often come to clinical attention when they are large and cause symptoms associated with hypopituitarism or invasion of parasellar structures. In contrast, functioning pituitary tumors may have few compressive symptoms if they manifest with complaints attributable to excessive pituitary hormones.

Coexistence of malignant struma ovarii and Graves' disease.

OBJECTIVE: To report an unusual case of hyperthyroidism from Graves' disease that was coexistent with malignant struma ovarii. METHODS: We summarize the clinical history, physical findings, laboratory data, imaging studies, pathologic features, and treatment in a patient with recurrent hyperthyroidism and discuss the incidence of ovarian tumors of various histologic origins, including thyroid tissue (that is, struma ovarii). RESULTS: Five years after diagnosis of Graves' disease and resolution of symptoms with 1 year of antithyroid drug therapy, a 53-year-old woman had recurrence of palpitations, tremors, and weight loss. Results of thyroid function tests showed high total and free thyroxine levels and a low thyrotropin level. Thyroid radioiodine uptake was high (69% at 24 hours). Abdominal ultrasound studies disclosed a cystic mass in the right adnexal area. Total abdominal hysterectomy and bilateral oophorectomy revealed a 7.5-cm cystic right ovary that contained a 1.0-cm struma ovarii with a 0.4-cm nodule of follicular variant papillary thyroid carcinoma within it. The patient was treated with methimazole and radioiodine ablation of the thyroid. Three months later, a massive myocardial infarction resulted in her death. CONCLUSION: The concomitant presence of Graves' disease complicates the management of struma ovarii and raises interesting questions about treatment and prognosis.