ArticleBMJ case reports2024
Thyrotoxic periodic paralysis complicated by carbimazole-associated myositis.
Article in BMJ case reports, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A male of East Asian background in his 30s presented to the emergency department with acute onset global muscle weakness, elevated creatine kinase, profound hypokalaemia and hyperthyroidism. A diagnosis of thyrotoxic periodic paralysis was made and the myopathy resolved promptly with potassium replacement. However, 3 months after being commenced on carbimazole for hyperthyroidism, the patient developed myalgias without weakness associated with an elevated creatine kinase. The myositis panel was negative, while a muscle biopsy showed nonspecific, mild myopathic changes with minimal lymphocytic inflammation. As a change in therapy from carbimazole to propylthiouracil resulted in prompt symptom improvement and normalisation of serum creatine kinase levels, a presumptive diagnosis of carbimazole-induced myositis was made. Genetic testing for hereditary skeletal muscle channelopathies did not identify any gene of interest.
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