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Thyroid hormone replacement

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https://www.readbyqxmd.com/read/28327186/clinical-behavioural-and-pharmacogenomic-factors-influencing-the-response-to-levothyroxine-therapy-in-patients-with-primary-hypothyroidism-protocol-for-a-systematic-review
#1
Rosie Dew, Onyebuchi Okosieme, Colin Dayan, Vinay Eligar, Ishrat Khan, Salman Razvi, Simon Pearce, Scott Wilkes
BACKGROUND: Suboptimal thyroid hormone therapy including under-replacement and over-replacement is common amongst patients with hypothyroidism. This is a significant health concern as affected patients are at risk of adverse cardiovascular or metabolic consequences. Despite a growing body of evidence on the effects of various factors on thyroid hormone replacement, a systematic appraisal of the evidence is lacking. This review aims to appraise and quantify the extent to which clinical, behavioural and pharmacogenomic factors affect levothyroxine therapy in patients with primary hypothyroidism...
March 21, 2017: Systematic Reviews
https://www.readbyqxmd.com/read/28324106/clinical-features-of-early-and-late-postoperative-hypothyroidism-after-lobectomy
#2
Suyeon Park, Min Ji Jeon, Eyun Song, Hye-Seon Oh, Mijin Kim, Hyemi Kwon, Tae Yong Kim, Suck Joon Hong, Young Kee Shong, Won Bae Kim, Tae-Yon Sung, Won Gu Kim
Context: Lobectomy is preferred in thyroid cancer to decrease surgical complications and avoid lifelong thyroid-hormone replacement. However, postoperative hypothyroidism, requiring thyroid-hormone replacement, may occur. Objective: We aimed to identify the incidence and risk factors of postoperative hypothyroidism to develop a surveillance strategy after lobectomy for papillary thyroid microcarcinoma (PTMC). Methods: This historical cohort study involved 335 PTMC patients treated by lobectomy...
January 11, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28324063/dio2-thr92ala-reduces-deiodinase-2-activity-and-serum-t3-levels-in-thyroid-deficient-patients
#3
M G Castagna, M Dentice, S Cantara, R Ambrosio, F Maino, T Porcelli, C Marzocchi, C Garbi, F Pacini, D Salvatore
Context: A significant proportion of athyreotic LT4-treated patients experience hypothyroid-like symptoms. During LT4 replacement, levels of the active hormone triiodothyronine (T3) strictly depend on type-2-deiodinase (D2)-mediated activation of LT4. The Thr92Ala polymorphism and the 258 G/A in the DIO2 gene have been associated with various clinical conditions. Objectives: To investigate the effects of DIO2 polymorphisms in thyroid hormone homeostasis. Design: We compared the pre-surgical hormonal status of thyroidectomized LT4-treated patients who had a similar TSH level, to their post-surgery status, and analyzed their DIO2 genotype in a subgroup of 102/140 (72...
February 2, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28320137/what-increases-the-risk-of-malnutrition-in-parkinson-s-disease
#4
Svetlana Tomic, Vlasta Pekic, Zeljka Popijac, Tomislav Pucic, Marta Petek, Tihana Gilman Kuric, Sanja Misevic, Ruzica Palic Kramaric
Parkinson's disease (PD) patients are at a higher risk of malnutrition. The prevalence has been estimated to 0-24%, while 3%-60% of PD patients are reported to be at risk of malnutrition. To date, there is no clear explanation for malnutrition in these patients. The aim of this study was to determine the prevalence of malnutrition and to analyze factors that influence its appearance. The Mini Nutritional Assessment (MNA) was used to determine normal nutritional status; at risk of malnutrition; and already malnourished status...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319287/iatrogenic-thyrotoxicosis-and-the-role-of-therapeutic-plasma-exchange
#5
Kabeer K Shah, Michael M Mbughuni, Edwin A Burgstaler, Darci R Block, Jeffrey L Winters
Thyroid storm or severe thyrotoxicosis results from extreme thyroid hormone elevation. Therapy includes medical management to prevent hormone production, release, recycling, and peripheral conversion while stabilizing adrenergic tone. Thyroid dysfunction is the usual cause but it can be due to excessive thyroid hormone ingestion. Therapeutic plasma exchange (TPE) has been used to rapidly remove protein-bound thyroid hormone. American Society for Apheresis guidelines make a weak recommendation to perform TPE in selected patients in the treatment of thyrotoxicosis based on low quality evidence...
March 20, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/28291505/the-high-prevalence-of-reversible-subclinical-hypothyroidism-with-elevated-serum-thyroglobulin-levels-in-chronic-kidney-disease-patients%C3%A2
#6
Toru Sanai, Ken Okamura, Shuichi Rikitake, Makoto Fukuda, Koji Onozawa, Mai Sanematsu, Tsuyoshi Takashima, Motoaki Miyazono, Yuji Ikeda
BACKGROUND: We examined the thyroid function of non-dialysis-dependent chronic kidney disease (CKD) patients in Japan. METHODS: Serum-free thyroxine, free triiodothyronine, thyroid-stimulating hormone (TSH), and thyroglobulin (Tg) levels were evaluated in 37 CKD patients. CKD was defined as sustained kidney damage for more than 3 months and was classified as CKD 1+2 (n = 11), 3+4 (n = 10), or 5 (n = 16), which were defined by glomerular filtration rates of ≥ 60, 15 - 59, or < 15 mL/min/1...
March 14, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28287838/renal-function-improves-with-the-treatment-of-hypothyroidism
#7
Oktay Bulur, Kursat Dal, Derun Taner Ertugrul, Murat Eser, Fatma Kaplan Efe, Serdar Karakaya, Kubilay Şahin, Salih Baser, Naim Ata, Aysun Aybal Kutlugun, Esin Beyan
BACKGROUND: It has been known that thyroid hormones may affect renal function. In this study, we aimed to investigate the effect of levothyroxine replacement on renal function in hypothyroid patients before and after treatment. METHODS: We retrospectively investigated free T3 (fT3), free T4 (fT4), TSH, creatinine, and eGFR measurements during both hypothyroid and euthyroid states of hypothyroid patients. The eGFR was calculated using the simplified Modification of Diet in Renal Disease formula...
March 13, 2017: Endocrine Research
https://www.readbyqxmd.com/read/28286688/beneficial-effects-on-pregnancy-outcomes-of-thyroid-hormone-replacement-for-subclinical-hypothyroidism
#8
Norman J Blumenthal, Creswell J Eastman
Background. Hypothyroidism and raised thyroid antibody levels have been associated with adverse obstetrical outcomes. Several studies have investigated causal associations, but results have been inconsistent and few studies have reported the effects of thyroxine replacement therapy on pregnancy outcomes in hypothyroid patients. Objective. The primary study objective was to determine the outcome of pregnancies in women diagnosed with overt and subclinical hypothyroidism (SCH) (serum TSH > 2.5 mIU/L) and those with elevated circulating thyroid autoantibody levels in the first trimester of pregnancy and after the institution of appropriate thyroxine replacement therapy to maintain the serum TSH ≤ 2...
2017: Journal of Thyroid Research
https://www.readbyqxmd.com/read/28283939/high-dose-of-radioactive-iodine-per-se-has-no-effect-on-glucose-metabolism-in-thyroidectomized-rats
#9
Roghaieh Samadi, Mahboubeh Ghanbari, Babak Shafiei, Sevda Gheibi, Fereidoun Azizi, Asghar Ghasemi
PURPOSE: Thyroid concentrates radioactive iodine by sodium-iodide symporter; this is used for treating hyperthyroidism and thyroid cancer. Pancreas expresses NIS and radioactive iodine uptake may damage pancreatic beta-cells and predispose patients to type 2 diabetes. The aim of this study was to determine whether radioactive iodine is associated with glucose metabolism in thyroidectomized rats. METHODS: Forty male Wistar rats were divided into four groups (n = 10/each); control, thyroidectomized, thyroidectomized-treated with 131-I (TX+I), and thyroidectomized-treated with 131-I and L-thyroxine (TX+I+T4)...
March 10, 2017: Endocrine
https://www.readbyqxmd.com/read/28273204/is-there-an-association-between-thyroid-function-abnormalities-and-breast-cancer
#10
Anna Angelousi, Evanthia Diamanti-Kandarakis, Evangelia Zapanti, Afroditi Nonni, Eftuxios Ktenas, Aimilia Mantzou, Konstantinos Kontzoglou, Grigorios Kouraklis
Objective: The aim of this study was to evaluate the association between thyroid function abnormalities and breast cancer and, in particular, the prognostic markers of breast cancer.. Subjects and methods: Baseline levels of thyrotropin, free triiodothyronine, free thyroxine and thyroid autoantibodies were measured in 97 women with primary breast cancer, 27 women with benign breast disease, and 4 women with atypical ductal hyperplasia. Their baseline levels were compared with those in 48 healthy women with a normal mammography in the last 2 years...
January 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28271292/prevalence-of-right-atrial-non-pulmonary-vein-triggers-in-atrial-fibrillation-patients-treated-with-thyroid-hormone-replacement-therapy
#11
Ki-Hun Kim, Sanghamitra Mohanty, Prasant Mohanty, Chintan Trivedi, Eli Hamilton Morris, Pasquale Santangeli, Rong Bai, Amin Al-Ahmad, John David Burkhardt, Joseph G Gallinghouse, Rodney Horton, Javier E Sanchez, Shane Bailey, Patrick M Hranitzky, Jason Zagrodzky, Soo G Kim, Luigi Di Biase, Andrea Natale
BACKGROUND: Thyroid hormone (TH) is known to enhance arrhythmogenicity, and high-normal thyroid function is related with an increased recurrence of atrial fibrillation (AF) after catheter ablation. However, the impact of thyroid hormone replacement (THR) on AF ablation is not well known. METHODS: This study evaluated 1163 consecutive paroxysmal AF patients [160 (14%) on THR and 1003 (86%) without THR] undergoing their first catheter ablation. A total of 146 patients on THR and 146 controls were generated by propensity matching, based on calculated risk factor scores, using a logistic model (age, sex, body mass index, and left atrium size)...
March 7, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28261292/epicardial-fat-thickness-and-oxidative-stress-parameters-in-patients-with-subclinical-hypothyroidism
#12
Ali Aydogdu, Emel Yigit Karakas, Emre Erkus, İbrahim Halil Altıparmak, Emin Savık, Turgay Ulas, Tevfik Sabuncu
INTRODUCTION: Thyroid disorders are known to be a risk factor for cardiovascular diseases. Epicardial fat thickness (EFT) and oxidative stress are also believed to be major risk factors for cardiovascular events. The aim of this study was to evaluate the possible relationship between oxidative stress parameters and EFT in patients with subclinical hypothyroidism (SCH). MATERIAL AND METHODS: A total of 60 individuals (30 patients with SCH and 30 healthy controls) were recruited for the study...
March 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28255851/the-impact-of-bariatric-surgery-on-thyroid-function-and-medication-use-in-patients-with-hypothyroidism
#13
Alex Zendel, Yasmin Abu-Ghanem, Joseph Dux, Eyal Mor, Douglas Zippel, David Goitein
BACKGROUND: Bariatric surgery (BS) is effective in treating obesity and its associated comorbidities. However, there is a paucity of data on the effect of BS on thyroid function in hypothyroid patients, specifically in those treated with thyroid hormone replacement therapy (THR). The aim of this study was to assess the effect of BS on thyroid function and on THR dosage in patients with hypothyroidism. METHODS: A retrospective analysis of prospectively collected data of all hypothyroid patients who underwent BS between 2010 and 2014 was performed...
March 2, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28255471/intracerebral-bleeding-and-massive-pericardial-effusion-as-presenting-symptoms-of-myxedema-crisis
#14
M Kirsch, C Rimpau, C H Nickel, P Baier
The endocrinological emergency of a fully blown myxedema crisis can present as a multicolored clinical picture. This can obscure the underlying pathology and easily lead to mistakes in clinical diagnosis, work-up, and treatment. We present a case of an unconscious 39-year-old patient with a medical history of weakness, lethargy, and findings of hyponatremia, intracerebral bleeding, and massive pericardial effusion. Finally, myxedema crisis was diagnosed as underlying cause. Replacement therapy of thyroid hormone and conservative management of the intracerebral bleeding resulted in patient's survival without significant neurological impairment...
2017: Case Reports in Emergency Medicine
https://www.readbyqxmd.com/read/28222413/a-new-tr%C3%AE-mutation-in-resistance-to-thyroid-hormone-syndrome
#15
Corina Neamţu, Claudiu Ţupea, Diana Păun, Anca Hoisescu, Adina Ghemigian, Samuel Refetoff, Chutintorn Sriphrapradang
Thyroid hormones (TH) exert their actions by binding nuclear receptors alpha (TRα1) and beta (TRß1 and TRß2). Resistance to thyroid hormone (RTH) is a clinical syndrome with various clinical manifestations, its hallmark being decreased tissue sensitivity to the action of thyroid hormones. We report the case of a family harbouring a novel TRß mutation. Sequencing of the TRβ gene revealed a single nucleotide substitution-C to G in codon 340: glutamine was replaced by glutamic acid. The clinical picture and biochemical and hormonal panel showed significant differences within the family, despite their sharing the same mutation...
October 2016: Hormones: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28208903/nephrotic-syndrome-increases-the-need-for-levothyroxine-replacement-in-patients-with-hypothyroidism
#16
Hareeshababu Karethimmaiah, Vijaya Sarathi
INTRODUCTION: Nephrotic syndrome is a known cause of hypothyroidism; however, its effect on replacement doses of L-thyroxine in patients with primary hypothyroidism is not systematically studied. AIM: The aim of the present study was to evaluate the effect of newly diagnosed nephrotic syndrome on the dose of L-thyroxine replacement in previously diagnosed patients with primary hypothyroidism who were on full, stable dose of L-thyroxine replacement for at least one year...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28207545/primary-hypothyroidism-in-the-community-lower-daily-dosages-of-levothyroxine-replacement-therapy-for-asian-patients
#17
Ngiap Chuan Tan, Rong Quan Chew, Yi Ling Eileen Koh, Reena Chandini Subramanian, Usha Sankari, Meykkumar Meyappan, Li Wei Cho
The goal of treatment in patients with primary hypothyroidism is to attain euthyroidism guided by the stipulated thyroid-stimulating hormone (TSH) levels range so as to minimize any potential long-term adverse effects. However, various factors may result in their Levothyroxine (T4) under and over-replacement.Our study aimed to evaluate the mean daily dose of L-T4 replacement for Asian patients with primary hypothyroidism. The secondary aims were to determine the proportion of those who were either over or under-replaced, and the factors associated with their thyroid function status and replacement adherence...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28193557/birds-and-flame-retardants-a-review-of-the-toxic-effects-on-birds-of-historical-and-novel-flame-retardants
#18
REVIEW
Mélanie F Guigueno, Kim J Fernie
Flame retardants (FRs) are a diverse group of chemicals, many of which persist in the environment and bioaccumulate in biota. Although some FRs have been withdrawn from manufacturing and commerce (e.g., legacy FRs), many continue to be detected in the environment; moreover, their replacements and/or other novel FRs are also detected in biota. Here, we review and summarize the literature on the toxic effects of various FRs on birds. Birds integrate chemical information (exposure, effects) across space and time, making them ideal sentinels of environmental contamination...
April 2017: Environmental Research
https://www.readbyqxmd.com/read/28177382/effect-of-expeller-extracted-canola-meal-on-growth-performance-organ-weights-and-blood-parameters-of-growing-pigs
#19
D E Velayudhan, K Schuh, T A Woyengo, J S Sands, C M Nyachoti
The aim of this study was to assess the effects of increasing levels of expeller extracted canola meal (EECM) in diets for growing pigs on performance, gastrointestinal tract weight, thyroid gland weights, blood plasma concentration of triiodothyronine and tetraiodothyronine, red blood cell count, hemoglobin content in blood, and hematocrit. Four diets were fed to 48 pigs (19.9 ± 1.60 kg initial BW) in 24 pens (6 pens per diet) for 4 wk in a completely randomized design. The diets were a control corn-soybean meal basal diet and 3 additional diets produced by replacing 33, 66, or 100% of soybean meal with EECM to achieve inclusion levels of 0, 10, 20, and 30%...
January 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28176633/hypothyroidism-and-nephrotic-syndrome-why-when-and-how-to-treat
#20
Francesca Di Mario, Riccardo Pofi, Antonietta Gigante, Laura Rivoli, Edoardo Rosato, Andrea Maria Isidori, Rosario Cianci, Biagio Barbano
Hypothyroidism, characterised by low/normal free thyroxine (FT4) and free tri-iodothyronine (FT3) with elevated thyroid-stimulating hormone (TSH), is a well-known complication of nephrotic syndrome (NS). This is a common feature of primary and secondary glomerular diseases and comprises loss of protein in the urine and increased urinary excretion of thyroid hormones and thyroxine-binding globulin. With a normal thyroid reserve, this scenario is associated with the development of subclinical hypothyroidism, with a slight increase in TSH and normal free fractions...
February 7, 2017: Current Vascular Pharmacology
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