Amiodarone-Induced Thyroid Dysfunction: A Clinical Update. 2018

Mohamed Nabil Elnaggar, and Kahtan Jbeili, and Nik Nik-Hussin, and Mohandas Kozhippally, and Joseph M Pappachan
Department of Endocrinology, Diabetes & Metabolism, University Hospitals of Morecambe Bay NHS Foundation Trust, United Kingdom, LA1 4RP.

Amiodarone is one of the most commonly prescribed antiarrhythmic agents in clinical practice owing to its efficacy, even with high toxicity profile. The high iodine content and the prolonged biological half-life of the drug can result in thyroid dysfunction in a high proportion of patients treated with amiodarone even after cessation of amiodarone. Both hypothyroidism and hyperthyroidism are common side effects that mandate regular monitoring of patients with thyroid function tests. Amiodarone-induced hypothyroidism (AIH) is diagnosed and managed in the same way as a usual case of hypothyroidism. However, differential diagnosis and clinical management of amiodarone-induced thyrotoxicosis (AIT) subtypes can be challenging. With the aid of a case snippet, we update the current evidence for the diagnostic work up and management of patients with amiodarone-induced thyroid dysfunction in this article.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D002637 Chest Pain Pressure, burning, or numbness in the chest. Precordial Catch,Precordial Catch Syndrome,Texidor's Twinge,Chest Pains,Pain, Chest,Pains, Chest,Syndrome, Precordial Catch,Texidor Twinge
D003324 Coronary Artery Disease Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause. Arteriosclerosis, Coronary,Atherosclerosis, Coronary,Coronary Arteriosclerosis,Coronary Atherosclerosis,Left Main Coronary Artery Disease,Left Main Coronary Disease,Left Main Disease,Arterioscleroses, Coronary,Artery Disease, Coronary,Artery Diseases, Coronary,Atheroscleroses, Coronary,Coronary Arterioscleroses,Coronary Artery Diseases,Coronary Atheroscleroses,Left Main Diseases
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000638 Amiodarone An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting POTASSIUM CHANNELS and VOLTAGE-GATED SODIUM CHANNELS. There is a resulting decrease in heart rate and in vascular resistance. Amiobeta,Amiodarex,Amiodarona,Amiodarone Hydrochloride,Amiohexal,Aratac,Braxan,Corbionax,Cordarex,Cordarone,Kordaron,L-3428,Ortacrone,Rytmarone,SKF 33134-A,Tachydaron,Trangorex,Hydrochloride, Amiodarone,L 3428,L3428,SKF 33134 A,SKF 33134A
D000889 Anti-Arrhythmia Agents Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade. Anti-Arrhythmia Agent,Anti-Arrhythmia Drug,Anti-Arrhythmic,Antiarrhythmia Agent,Antiarrhythmia Drug,Antiarrhythmic Drug,Antifibrillatory Agent,Antifibrillatory Agents,Cardiac Depressant,Cardiac Depressants,Myocardial Depressant,Myocardial Depressants,Anti-Arrhythmia Drugs,Anti-Arrhythmics,Antiarrhythmia Agents,Antiarrhythmia Drugs,Antiarrhythmic Drugs,Agent, Anti-Arrhythmia,Agent, Antiarrhythmia,Agent, Antifibrillatory,Agents, Anti-Arrhythmia,Agents, Antiarrhythmia,Agents, Antifibrillatory,Anti Arrhythmia Agent,Anti Arrhythmia Agents,Anti Arrhythmia Drug,Anti Arrhythmia Drugs,Anti Arrhythmic,Anti Arrhythmics,Depressant, Cardiac,Depressant, Myocardial,Depressants, Cardiac,Depressants, Myocardial,Drug, Anti-Arrhythmia,Drug, Antiarrhythmia,Drug, Antiarrhythmic,Drugs, Anti-Arrhythmia,Drugs, Antiarrhythmia,Drugs, Antiarrhythmic
D013959 Thyroid Diseases Pathological processes involving the THYROID GLAND. Disease, Thyroid,Diseases, Thyroid,Thyroid Disease
D013960 Thyroid Function Tests Blood tests used to evaluate the functioning of the thyroid gland. Jostel's TSH Index,Jostel's Thyrotropin Index,Protein-Bound Iodine Test,SPINA-GD,SPINA-GT,Secretory Capacity of the Thyroid Gland,Sum Activity of Peripheral Deiodinases,Thyrotroph Thyroid Hormone Sensitivity Index,Thyroid Gland Function Tests,Function Test, Thyroid,Iodine Test, Protein-Bound,Jostel TSH Index,Jostel Thyrotropin Index,Jostel's TSH Indices,Jostels TSH Index,Jostels Thyrotropin Index,Protein Bound Iodine Test,Protein-Bound Iodine Tests,TSH Index, Jostel's,Test, Protein-Bound Iodine,Test, Thyroid Function,Thyroid Function Test,Thyrotropin Index, Jostel's
D013971 Thyrotoxicosis A hypermetabolic syndrome caused by excess THYROID HORMONES which may come from endogenous or exogenous sources. The endogenous source of hormone may be thyroid HYPERPLASIA; THYROID NEOPLASMS; or hormone-producing extrathyroidal tissue. Thyrotoxicosis is characterized by NERVOUSNESS; TACHYCARDIA; FATIGUE; WEIGHT LOSS; heat intolerance; and excessive SWEATING. Thyrotoxicoses

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