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Thyroid and amiodarone

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https://www.readbyqxmd.com/read/28814251/the-role-of-radiopharmaceuticals-in-amiodarone-induced-thyroid-pathology
#1
Doina Piciu, Alexandru Irimie
Amiodarone is a di-iodinated benzofuran derivative and is classified as a class III antiarrhythmic agent. It is one of the most powerful and effective antiarrhythmics, being a first-line agent due to its ability to treat ventricular and supraventricular dysrhythmias; since 1960 the drug has become one of the most frequently prescribed antiarrhythmics, despite its potentially serious, side effects. By far, one of the most challenging condition is the thyroid pathology induced by this drug. Each 200 mg tablet of amiodarone contains approximately 75 mg of iodine, 3-10% from each tablet being released as free iodine...
August 16, 2017: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/28705229/brugada-syndrome-in-a-patient-with-amyotrophic-lateral-sclerosis-a-case-report
#2
Anusha Battineni, Rohit Gummi, Naresh Mullaguri, Raghav Govindarajan
BACKGROUND: Amyotrophic lateral sclerosis is a fatal neuromuscular disorder characterized by progressive death of the upper and lower motor neurons in the central nervous system. Patients with this disease die mostly as a result of respiratory failure; however, owing to prolonged survival through assisted ventilation, cardiovascular causes are increasingly responsible for mortality. We report what is to the best of our knowledge the first case of type 2 Brugada syndrome causing ventricular tachyarrhythmia and cardiac arrest in a patient with upper limb onset amyotrophic lateral sclerosis...
July 14, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28681142/early-timing-of-thyroidectomy-for-hyperthyroidism-in-graves-disease-improves-biochemical-recovery
#3
Domenic Vital, Grégoire B Morand, Christian Meerwein, Roman D Laske, Hans C Steinert, Christoph Schmid, Michelle L Brown, Gerhard F Huber
BACKGROUND: The role of thyroidectomy as an early treatment for hyperthyroidism has been poorly investigated. Our aim was to examine its success rates, particularly focusing on thyroidectomy as an early treatment. METHODS: Patients with thyroidectomy for hyperthyroidism between February 2008 and October 2014 were included. They were divided into two groups (early and delayed thyroidectomy), and patient characteristics, treatment indications, complications and time to biochemical recovery were analyzed...
July 5, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28612237/assessment-of-the-impact-of-l-thyroxine-therapy-on-bleeding-risk-in-patients-receiving-vitamin-k-antagonists
#4
Farès Moustafa, Rémi Malhomme, Bruno Pereira, Alain Barres, Jennifer Saint-Denis, Frederic Dutheil, Marie Batisse, Jeannot Schmidt
BACKGROUND: Several studies have suggested a link exists between L-thyroxine and the coagulation system, and, according to some drug interaction studies, L-thyroxine can potentiate the effect of warfarin. This study sought to assess whether thyroid hormone therapy could impact the risk of bleeding in patients receiving vitamin K antagonists (VKAs). METHODS: We conducted a monocentric, retrospective study on prospectively collected data from consecutive patients enrolled in the Registry of patient with AntiThrombotic agents admitted to an Emergency Department (RATED) database, and compared the hemorrhage rates (both major and nonmajor) of patients receiving treatment with and without L-thyroxine...
June 13, 2017: Clinical Drug Investigation
https://www.readbyqxmd.com/read/28589093/successful-pretreatment-using-plasma-exchange-before-thyroidectomy-in-a-patient-with-amiodarone-induced-thyrotoxicosis
#5
Annelies Tonnelier, Jeroen de Filette, Ann De Becker, Sophie Deweer, Brigitte Velkeniers
INTRODUCTION: Amiodarone, used for the management of tachyarrhythmias, is associated with both hypothyroidism and thyrotoxicosis. Total thyroidectomy is an effective procedure for promptly reducing circulating thyroid hormone levels. It has been proposed in patients who have severe amiodarone-induced thyrotoxicosis (AIT) or are refractory to medical therapy, or when such therapy is contraindicated. Therapeutic plasma exchange (TPE) may be considered as a pretreatment for restoring a euthyroid state preoperatively, thereby reducing a patient's symptoms and the potential perioperative risk associated with thyrotoxicosis...
April 2017: European Thyroid Journal
https://www.readbyqxmd.com/read/28567296/thyrotoxicosis-leading-to-adrenal-crises-reveals-primary-bilateral-adrenal-lymphoma
#6
Catarina Roque, Ricardo Fonseca, Carlos Tavares Bello, Carlos Vasconcelos, António Galzerano, Sância Ramos
Primary adrenal lymphoma is a rare malignancy. It frequently presents bilaterally and with symptoms of adrenal insufficiency. Amiodarone may induce secondary organ dysfunction, and thyrotoxicosis develops in 15% of cases. The symptomatology of both conditions is nonspecific, especially in the elderly, and a high suspicion index is necessary for appropriate diagnosis. A 78-year-old female presented to the emergency department with confusion, nausea and vomiting. She had recently been to the emergency department with urinary tract infection, vomiting and acute hypochloremic hyponatremia...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28458899/takotsubo-cardiomyopathy-in-amiodarone-induced-hyperthyroidism
#7
Ismael Capel, Elisabet Tasa-Vinyals, Albert Cano-Palomares, Irene Bergés-Raso, Lara Albert, Mercedes Rigla, Assumpta Caixàs
SUMMARY: Takotsubo cardiomyopathy (TC) is an atypical, severe but reversible form of acute heart insufficiency. It typically presents with left ventricular failure, transient apical and mid-segments hypokinesis, absence of significant coronary stenosis and new electrographic abnormalities and/or elevation in serum cardiac enzymes. Although TC ('broken heart syndrome') has classically been associated with emotional trauma, evidence suggests that other precipitants might exist, including iatrogenic and thyroid-mediated forms...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28439924/prevalence-and-predictors-of-thyroid-functional-abnormalities-in-newly-diagnosed-al-amyloidosis
#8
E Muchtar, D S Dean, A Dispenzieri, D Dingli, F K Buadi, M Q Lacy, S R Hayman, P Kapoor, N Leung, S Russell, J A Lust, Yi Lin, R Warsame, W Gonsalves, T V Kourelis, R S Go, R Chakraborty, S Zeldenrust, R A Kyle, S Vincent Rajkumar, S K Kumar, M A Gertz
BACKGROUND: Data on the effect of systemic immunoglobulin light chain amyloidosis (AL amyloidosis) on thyroid function are limited. OBJECTIVE: To assess the prevalence of hypothyroidism in AL amyloidosis patients and determine its predictors. METHODS: 1142 newly diagnosed AL amyloidosis patients were grouped based on the thyroid-stimulating hormone (TSH) measurement at diagnosis: hypothyroid group (TSH above upper normal reference; >5 mIU L(-1) ; n = 217, 19% of study participants) and euthyroid group (n = 925, 81%)...
June 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28424174/the-clinical-value-of-regular-thyroid-function-tests-during-amiodarone-treatment
#9
Stan Benjamens, Robin P F Dullaart, Wim J Sluiter, Michiel Rienstra, Isabelle C van Gelder, Thera P Links
OBJECTIVE: Amiodarone is used for the maintenance of sinus rhythm in patients with arrhythmias, but thyroid dysfunction (amiodarone-induced thyrotoxicosis (AIT) or amiodarone-induced hypothyroidism (AIH)) is a common adverse effect. As the onset of AIT and AIH may be unpredictable, the value of long-term regular monitoring of amiodarone treated patients for thyroid dysfunction is still uncertain. DESIGN: We retrospectively documented the frequency at which overt thyroid dysfunction was preceded by subclinical thyroid dysfunction...
July 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28398380/-amiodarone-induced-thyrotoxicosis
#10
Fausto Bogazzi, Luca Tomisti, Vitantonio Di Bello, Enio Martino
Amiodarone-induced thyroid dysfunction occurs in about 15-20% of patients under amiodarone therapy. Amiodarone-induced hypothyroidism (AIH) can develop in patients with an apparently normal thyroid gland or in those with an underlying chronic autoimmune thyroiditis. On a clinical ground, AIH is not challenging and can be easily treated with L-thyroxine therapy. Amiodarone-induced thyrotoxicosis (AIT) can occur in patients with (AIT 1) or without (AIT 2) an underlying thyroid disease. AIT 1 is a true iodine-induced hyperthyroidism occurring in patients with an underlying thyroid autonomy while AIT 2 is a drug-induced destructive thyroiditis...
March 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28276175/population-level-incidence-and-monitoring-of-adverse-drug-reactions-with-long-term-amiodarone-therapy
#11
S Rankin, D H Elder, S Ogston, J George, C C Lang, A M Choy
INTRODUCTION: Amiodarone is associated with significant long-lasting adverse drug reactions (ADRs). Guidelines recommend laboratory monitoring during long-term use. However, data of compliance with laboratory monitoring is lacking. AIMS: The aim of this study was to assess laboratory monitoring of liver and thyroid function during amiodarone prescribing from 1989-2011 in the Tayside, UK, population (approximately 400,000) in relation to National guidelines recommending laboratory monitoring every 6 months...
March 9, 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/28250689/amiodarone-induced-loculated-pleural-effusion-without-pulmonary-parenchymal-involvement-a-case-report-and-literature-review
#12
Amer Hawatmeh, Mohammad Thawabi, Ashraf Jmeian, Hamid Shaaban, Fayez Shamoon
Amiodarone is an extremely effective antiarrhythmic drug that is known to cause many adverse effects such as pulmonary, thyroid, and liver toxicities. Of these, pulmonary toxicity is most serious. Pulmonary toxicity can present as interstitial pneumonitis, organizing pneumonia, pulmonary nodules and masses, and very rarely pleural effusions. We present a case of a 73-year-old male who presented with progressive exertional dyspnea, nonproductive cough, generalized fatigue, and weakness. He was found to have multiorgan toxicity secondary to long-term treatment with high doses of amiodarone...
January 2017: Journal of Natural Science, Biology, and Medicine
https://www.readbyqxmd.com/read/28217504/improving-iodine-nutritional-status-and-increasing-prevalence-of-autoimmune-thyroiditis-in-children
#13
Srinivasan Palaniappan, Lakshmi Shanmughavelu, Hemchand K Prasad, Sundari Subramaniam, Nedunchezian Krishnamoorthy, Lakshmi Lakkappa
OBJECTIVE: The objective of this study is to evaluate the link between excess iodine intake as evidenced by increased urinary iodine excretion (UIE) and autoimmune thyroiditis in children and to assess the correlation between UIE and thyroid microsomal antibody (thyroid peroxidase [TPO]) titers in children. MATERIALS AND METHODS: All children with goiter between age group 6 and 12 years, were subjected to blood tests for free thyroxine, thyroid stimulating hormone, and TPO antibody, fine needle aspiration was advised for all children with goiter...
January 2017: Indian Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28106465/evaluation-of-99m-tc-mibi-in-thyroid-gland-imaging-for-the-diagnosis-of-amiodarone-induced-thyrotoxicosis
#14
Junqi Wang, Ruiguo Zhang
OBJECTIVE: Amiodarone-induced thyrotoxicosis (AIT) is caused by amiodarone as a side effect of cardiovascular disease treatment. Based on the differences in their pathological and physiological mechanisms, many methods have been developed so far to differentiate AIT subtypes such as colour flow Doppler sonography (CFDS) and 24-h radioiodine uptake (RAIU). However, these methods suffer from inadequate accuracy in distinguishing different types of AITs and sometimes lead to misdiagnosis and delayed treatments...
March 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28079354/effect-of-excess-iodine-intake-on-thyroid-on-human-health
#15
REVIEW
Eftychia G Koukkou, Nikolaos D Roupas, Kostas B Markou
The recommended daily intake of iodide, is 150 μg for adolescents and adults, 250 μg for pregnancy and lactation. Thyroid gland is an effective collector of iodine. 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. The non-organic intrathyroidal iodine is usually low, but significantly greater compared to plasma...
April 2017: Minerva Medica
https://www.readbyqxmd.com/read/28059636/effects-of-adequate-iodine-supply-on-the-incidence-of-iodine-induced-thyroid-disorders-in-slovenia
#16
Vid Bajuk, Katja Zaletel, Edvard Pirnat, Sergej Hojker, Simona Gaberšček
BACKGROUND: This study 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 10-year period after the increase in mandatory salt iodization from the previous 10 mg/kg of potassium iodide to 25 mg/kg in 1999. Furthermore, the aim was to determine 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...
April 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
#17
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...
April 2017: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/27922495/toxic-and-endocrine-myopathies
#18
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
#19
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
#20
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
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