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Thyroid and amiodarone

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https://www.readbyqxmd.com/read/28079354/effect-of-excess-iodine-intake-on-thyroid-on-human-health
#1
Eftychia G Koukkou, Nikolaos D Roupas, Kostas B Markou
INTRODUCTION: The recommended daily intake of iodide, is 150 μg for adolescents and adults, 175 μg for pregnancy and 200 μg for lactation. Thyroid gland is an effective collector of iodine. EVIDENCE ACQUISITION: The active iodine uptake along the basolateral membrane of thyroid cell is followed by its transport to the apical edge of the cell and then to the follicle lumen. TSH acts through cAMP and stimulates NIS gene expression and protein synthesis. The major proportion of iodine in the thyroid gland is bound to Thyroglobulin...
January 12, 2017: Minerva Medica
https://www.readbyqxmd.com/read/28059636/the-effects-of-adequate-iodine-supply-on-the-incidence-of-iodine-induced-thyroid-disorders-in-slovenia
#2
Vid Bajuk, Katja Zaletel, Edvard Pirnat, Sergej Hojker, Simona Gaberšček
BACKGROUND: We aimed to establish the changes in the incidence and characteristics of iodine-induced hyperthyroidism (II-Hyper) and iodine-induced hypothyroidism (II-Hypo) in the two-year period before and the ten-year period after the increase in mandatory salt iodization from the previous 10 mg of potassium iodide to 25 mg per kg in 1999. Furthermore, we aimed at determining the duration of treatment in II-Hyper patients, since no data regarding severity and treatment of II-Hyper with respect to iodine supply are available...
January 6, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/27957745/exploring-new-zealand-prescription-data-using-sequence-symmetry-analyses-for-predicting-adverse-drug-reactions
#3
P S Nishtala, T-Y Chyou
WHAT IS KNOWN AND OBJECTIVE: Prescription sequence symmetry analyses (PSSA) is a ubiquitous tool employed in pharmacoepidemiological research to predict adverse drug reactions (ADRs). Several studies have reported the advantage of PSSA as a method that can be applied to a large prescription database with computational ease. The objective of this study was to validate New Zealand (NZ) prescription database as a potential source for identifying ADRs using the PSSA method. METHODS: We analysed de-identified individual-level prescription data for people aged 65 years and above for the period 2005 to 2014 from the pharmaceutical collections supplied by the NZ Ministry of Health...
December 13, 2016: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/27922495/toxic-and-endocrine-myopathies
#4
Hans D Katzberg, Charles D Kassardjian
PURPOSE OF REVIEW: This article discusses the clinical features, pathophysiology, and management of toxic and endocrine myopathies. RECENT FINDINGS: Early detection and expeditious correction of metabolic disturbances in endocrinopathies such as Cushing syndrome, thyroid and parathyroid diseases, and acromegaly can minimize and prevent neurologic complications including myopathy. Recently proposed mechanisms of injury in patients with critical illness myopathy include inhibition of protein synthesis, mitochondrial dysfunction, disruption of the ubiquitin-proteasome system, oxidative stress, and disruption of intramuscular calcium homeostasis, which can cause a myosin-loss myopathy...
December 2016: Continuum: Lifelong Learning in Neurology
https://www.readbyqxmd.com/read/27920832/risk-factors-for-amiodarone-induced-thyroid-dysfunction-in-japan
#5
Sayoko Kinoshita, Tomohiro Hayashi, Kyoichi Wada, Mikie Yamato, Takeshi Kuwahara, Toshihisa Anzai, Mai Fujimoto, Kouichi Hosomi, Mitsutaka Takada
BACKGROUND: Amiodarone is associated with a number of significant adverse effects, including elevated transaminase levels, pulmonary fibrosis, arrhythmia, and thyroid dysfunction. Although thyroid dysfunction is considered to be a common and potentially serious adverse effect of amiodarone therapy, the exact pathogenesis remains unknown because of its complex manifestations. Therefore, the prevalence of, and risk factors for, amiodarone-induced thyroid dysfunction in Japanese patients were investigated in the present study...
December 2016: Journal of Arrhythmia
https://www.readbyqxmd.com/read/27903390/-current-status-of-antiarrhythmic-drug-use-and-safety-assessment-in-chinese-patients-with-atrial-fibrillation
#6
R He, X Du, S W Liu, L J Sun, Y Li, H Zeng, Y Y Li, C Sun, Y Zhang, C S Ma, W Gao
Objective: To investigate the current status of antiarrhythmic drugs (AADs) use in Chinese patients with atrial fibrillation(AF) and assess the safety of AADs in this patient cohort. Methods: From January 2011 to December 2013, a total of 4 008 AF patients treated with AADs was enrolled in this study and patients were followed up for 24 months. Detailed information of prescribed drug, the causes of drug discontinuation and side effects were recorded. Results: Amiodarone was prescribed to 64.3%(2 579 cases) and propafenone to 31...
November 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27818781/subclinical-hypothyroidism-is-an-independent-predictor-of-adverse-cardiovascular-outcomes-in-patients-with-acute-decompensated-heart-failure
#7
Tomohiro Hayashi, Takuya Hasegawa, Hideaki Kanzaki, Akira Funada, Makoto Amaki, Hiroyuki Takahama, Takahiro Ohara, Yasuo Sugano, Satoshi Yasuda, Hisao Ogawa, Toshihisa Anzai
AIMS: Altered thyroid hormone metabolism characterized by a low triiodothyronine (T3), so-called low-T3 syndrome, is a common finding in patients with severe systemic diseases. Additionally, subclinical thyroid dysfunction, defined as abnormal thyroid stimulating hormone (TSH) and normal thyroxine (T4), causes left ventricular dysfunction. Our objective was to identify the prevalence and prognostic impact of low-T3 syndrome and subclinical thyroid dysfunction in patients with acute decompensated heart failure (ADHF)...
September 2016: ESC Heart Failure
https://www.readbyqxmd.com/read/27734699/-thyroid-hormones-and-cardiovascular-system
#8
Zdeňka Límanová, Jan Jiskra
Cardiovascular system is essentially affected by thyroid hormones by way of their genomic and non-genomic effects. Untreated overt thyroid dysfunction is associated with higher cardiovascular risk. Although it has been studied more than 3 decades, in subclinical thyroid dysfunction the negative effect on cardiovascular system is much more controversial. Large meta-analyses within last 10 years have shown that subclinical hyperthyroidism is associated with higher cardiovascular risk than subclinical hypothyroidism...
2016: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/27526021/evaluation-and-characterization-of-thyroid-disrupting-activities-in-soil-samples-along-the-second-songhua-river-china
#9
Dongdong Kong, Yafei Wang, Jinsheng Wang, Yanguo Teng, Na Li, Jian Li
In this study, a recombinant thyroid receptor (TR) gene yeast assay combined with Monte Carlo simulation were used to evaluate and characterize soil samples collected from Jilin (China) along the Second Songhua River, for their ant/agonist effect on TR. No TR agonistic activity was found in soils, but many soil samples exhibited TR antagonistic activities, and the bioassay-derived amiodarone hydrochloride equivalents, which was calculated based on Monte Carlo simulation, ranged from not detected (N.D.) to 35...
November 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27515316/adherence-to-guidelines-in-monitoring-amiodarone-induced-thyroid-dysfunction
#10
Chun-Jui Huang, Chi-Lung Tseng, Chia-Huei Chu, De-Feng Huang, Chin-Chou Huang, Liang-Yu Lin
RATIONALE, AIMS AND OBJECTIVES: Baseline thyroid function testing and regular follow-up of thyroid function under amiodarone usage was recommended by guidelines. Little is known about the status of amiodarone monitoring in real-world clinical care in Taiwan. The objective was to determine the rate of thyroid monitoring and to assess the clinical and physicians' characteristics associated with adequate monitoring in a tertiary referral centre for arrhythmia. METHODS: We reviewed the medical records of patients receiving amiodarone during the period 2008-2009 at Taipei Veterans General Hospital...
August 12, 2016: Journal of Evaluation in Clinical Practice
https://www.readbyqxmd.com/read/27398220/plasma-exchange-in-the-treatment-of-thyroid-storm-secondary-to-type-ii-amiodarone-induced-thyrotoxicosis
#11
Ling Zhu, Sueziani Binte Zainudin, Manish Kaushik, Li Yan Khor, Chiaw Ling Chng
UNLABELLED: Type II amiodarone-induced thyrotoxicosis (AIT) is an uncommon cause of thyroid storm. Due to the rarity of the condition, little is known about the role of plasma exchange in the treatment of severe AIT. A 56-year-old male presented with thyroid storm 2months following cessation of amiodarone. Despite conventional treatment, his condition deteriorated. He underwent two cycles of plasma exchange, which successfully controlled the severe hyperthyroidism. The thyroid hormone levels continued to fall up to 10h following plasma exchange...
2016: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/27296156/safety-and-efficacy-of-early-radiofrequency-catheter-ablation-in-patients-with-paroxysmal-atrial-fibrillation-complicated-with-amiodarone-induced-thyrotoxicosis
#12
Maojing Wang, Shanglang Cai, Libo Sun, Qing Zhao, Wenjing Feng
BACKGROUND: Amiodarone is an antiarrhythmic drug that is frequently used to control atrial fibrillation (AF). Many patients with AF are afraid of the risk of ablation and take amiodar-one, some patients develop amiodarone-induced thyrotoxicosis (AIT). The purpose of the study was to investigate the safety and efficacy of early radiofrequency catheter ablation in patients with paroxysmal AF complicated with AIT. METHODS: From the 146 consecutive patients with paroxysmal AF who had been treated with amiodarone and underwent 3-dimensional mapping system guided circumferential pulmonary vein isolation (PVI) at our center from January 2013 to June 2014, 20 had developed AIT...
2016: Cardiology Journal
https://www.readbyqxmd.com/read/27276725/-iodine-excess-induced-thyroid-dysfunction
#13
Michael Egloff, Jacques Philippe
The principle sources of iodine overload, amiodarone and radiologic contrast media, are frequently used in modern medicine. The thyroid gland exerts a protective effect against iodine excess by suppressing iodine internalization into the thyrocyte and iodine organification, the Wolff-Chaikoff effect. Insufficiency of this effect or lack of escape from it leads to hypo- or hyperthyroidism respectively. Amiodarone induced thyrotoxicosis is a complex condition marked by two different pathophysiological mechanisms with different treatments...
April 20, 2016: Revue Médicale Suisse
https://www.readbyqxmd.com/read/27197836/dronedarone-and-amiodarone-induce-dyslipidemia-and-thyroid-dysfunction-in-rats
#14
Li-Qin Jiang, Shan-Jiang Chen, Jian-Jiang Xu, Zhang Ran, Wang Ying, Sheng-Gang Zhao
BACKGROUND/AIMS: Amiodarone, a thyroid hormone-like molecule, can induce dyslipidemia and thyroid dysfunction. However, the effects of dronedarone on lipid metabolism and of both dronedarone and amiodarone on thyroid function and lipid metabolism remain unknown. METHODS: Fifty male Sprague-Dawley rats were randomly divided into 5 groups (10 in each group): normal control (NC), amiodarone-treated (AMT), dronedarone-treated (DRT), rats treated with amiodarone combined with polyene phosphatidylcholine (AC), and rats treated with dronedarone combined with polyene phosphatidylcholine (DC)...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27163459/99mtc-sestamibi-thyroid-scan-in-amiodarone-induced-thyrotoxicosis-type-i
#15
Niraj R Patel, Luis A Tamara, Ho Lee
Amiodarone-induced thyrotoxicosis (AIT) type I describes inducement of clinical hyperthyroidism by excessive thyroidal iodine in the setting of latent Graves disease, and therapy differs from that used for AIT type II. A 65-year-old man previously on amiodarone for atrial fibrillation developed clinical hyperthyroidism. Diagnosis of AIT was made, but the type was not clear. Tc sestamibi thyroid scan showed diffusely increased uptake and retention in an enlarged thyroid gland, a pattern consistent with AIT type I...
July 2016: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/27129624/short-term-amiodarone-treatment-for-atrial-fibrillation-after-catheter-ablation-induces-a-transient-thyroid-dysfunction-results-from-the-placebo-controlled-randomized-amio-cat-trial
#16
Søren Zöga Diederichsen, Stine Darkner, Xu Chen, Arne Johannesen, Steen Pehrson, Jim Hansen, Ulla Feldt-Rasmussen, Jesper Hastrup Svendsen
BACKGROUND: Amiodarone is known to affect the thyroid, but little is known about thyroid recovery after short-term amiodarone treatment. OBJECTIVES: We aimed to evaluate the impact of 8weeks of amiodarone treatment on thyroid function in patients with atrial fibrillation (AF) undergoing catheter ablation in a randomised, double-blind clinical trial. METHODS: 212 patients referred for AF ablation at two centres were randomized to 8weeks of oral amiodarone or placebo...
September 2016: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/27110118/dysfunction-of-the-thyroid-gland-during-amiodarone-therapy-a-study-of-297-cases
#17
Agata Czarnywojtek, Maria Teresa Płazińska, Małgorzata Zgorzalewicz-Stachowiak, Kosma Woliński, Adam Stangierski, Izabela Miechowicz, Joanna Waligórska-Stachura, Paweł Gut, Leszek Królicki, Maja Zioncheck, Marek Ruchała
AIM: This study aims to explore and compare the efficacy of radioiodine treatment (RIT) in hyperthyroid and euthyroid patients who have been treated with amiodarone (AM) in the past or are currently undergoing AM treatment. Clinical observation of a group of patients with amiodarone-induced hypothyroidism during a 12-month follow-up period was used for comparison. DESIGN: This was a observational, two-centered study. Patients were assessed at baseline and at 2 months, 6 months, 8 months, and 12 months after RIT...
2016: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/27100465/adverse-reactions-of-amiodarone-on-the-thyroid
#18
John Somberg, Janos Molnar
No abstract text is available yet for this article.
2016: Cardiology
https://www.readbyqxmd.com/read/27100205/environmental-iodine-content-female-sex-and-age-are-associated-with-new-onset-amiodarone-induced-hypothyroidism-a-systematic-review-and-meta-analysis-of-adverse-reactions-of-amiodarone-on-the-thyroid
#19
Bin Zhong, Yazhu Wang, Guo Zhang, Zhe Wang
OBJECTIVES: To investigate the incidence of new-onset amiodarone-induced hypothyroidism (AIH) and the associated risk factors. METHODS: We performed a systematic search in MEDLINE, Embase, the Cochrane Library and the Chinese database from 1995 to 2015. Studies that investigated amiodarone-related adverse reactions on the thyroid were included. A random-effect model was used for the meta-analysis to investigate the incidence rate of AIH and associated risk factors...
2016: Cardiology
https://www.readbyqxmd.com/read/27042749/serial-changes-of-liver-function-tests-before-and-during-methimazole-treatment-in-thyrotoxic-patients
#20
Dan Alexandru Niculescu, Roxana Dusceac, Simona Andreea Galoiu, Cristina Ana-Maria Capatina, Catalina Poiana
OBJECTIVE: Overt hyperthyroidism and methimazole (MMI) treatment are frequently associated with abnormal liver function tests (LFTs). We describe the serial changes of LFTs in MMI-treated hyperthyroid patients. METHODS: We retrospectively analyzed all 77 patients presenting with newly diagnosed overt hyperthyroidism (59 Graves diseases, 11 toxic nodular goiters, 4 toxic adenomas, 3 amiodarone-induced thyrotoxicosis) between 2012 and 2014. All patients started MMI at 10 to 60 mg/day that was gradually tapered...
August 2016: Endocrine Practice
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