Amiodarone/diltiazem/propylthiouracil Reactions 1680, p28 - 2 Dec 2017 X S Hypothyroidism induced rhabdomyolysis: case report A 56-year-old woman developed hypothyroidism induced rhabdomyolysis due to propylthiouracil and an interaction between amiodarone and diltiazem [routes and times to reaction onsets not stated]. The woman, who had a past medical history of interstitial pulmonary disease, atrial fibrillation with rapid ventricular response, end stage diabetic nephropathy and congestive heart failure, presented with nausea and fatigue. She had undergone a renal transplantation 10 years prior and was on haemodialysis four times a week for 18 months. She also had a history of sub-clinical hyperthyroidism and atrial fibrillation with rapid ventricular response. A thyroid nodule was diagnosed and antithyroid treatment with propylthiouracil 300mg was initiated. She had also been receiving amiodarone 400mg for atrial fibrillation with rapid ventricular response and diltiazem [therapeutic indication not stated]. Her other medications included olanzapine, warfarin, citalopram, aspirin, theophylline and calcium acetate. Initial laboratory tests were performed, which revealed serum creatinine 6.61 mg/dL, creatine phosphokinase 6314 U/L, lactate dehydrogenase 3643 U/L, thyroid stimulating hormone greater than 100 µIU, free T3 1.5 pg/mL and free T4 0.4 ng/dL. Basal serum cortisol was 32.97 µg/dL. Thyroid ultrasound revealed normal thyroid gland size. The thyroid gland showed a heterogeneous appearance with fibrous glands, but no nodules were observed. A diagnosis of hypothyroidism induced rhabdomyolysis was made. The woman’s amiodarone and propylthiouracil therapies were withdrawn. She received levothyroxine sodium [levothyroxine] replacement therapy. During the first five days of hospitalisation, daily haemodialysis was performed. Her muscle enzymes gradually returned to normal within two weeks. After two weeks of hospitalisation, she was discharged in a good clinical condition. Author comment: "In our patient, hypothyroidism is likely to have developed due to antithyroid treatment started for subclinical hyperthyroidism." "Hemodialysis patients are likely to have an increased risk for hypothyroidism induced rhabdomyolysis regarding the presence of comorbidities such as electrolyte imbalances, diabetes mellitus, medications received, and drug-drug interactions (i.e., antihyperlipidemics, antihypertensives, and antiarrhythmics)." Tatar E, et al. Hypothyroidism induced severe Rhabdomyolysis in a hemodialysis patient. Case Reports in Medicine 2014: 501890, 2014. Available from: URL: - Turkey 803283923 0114-9954/17/1680-0001/$14.95 Adis © 2017 Springer International Publishing AG. All rights reserved Reactions 2 Dec 2017 No. 1680 Reactions Weekly Springer Journals


Reactions Weekly , Volume 1680 (1) – Dec 2, 2017
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Springer International Publishing
Copyright © 2017 by Springer International Publishing AG, part of Springer Nature
Medicine & Public Health; Drug Safety and Pharmacovigilance; Pharmacology/Toxicology
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