• Alexander Spyridoulias and Muhammad Shakeel Riaz.
• Anaesthesia and Intensive Care, Tameside Hospital NHS Foundation Trust, Lancashire, UK.
• BMJ Case Rep. 2016 Jan 11; 2016.

AbstractDecompensated hypothyroidism is a rare endocrine emergency but a differential that should be considered in patients presenting critically unwell with systemic illness. We report a case of myxoedema coma in a woman presenting with respiratory failure, hypotension, hypothermia and a reduced level of consciousness, all of which are poor prognostic features in decompensated hypothyroidism. The patient was admitted to critical care for mechanical ventilation and cardiovascular support and treated with a combination of insulin, liothyronine and levothyroxine, making a good recovery. We wanted to highlight this case of myxoedema coma occurring in the context of a hyperglycaemic hyperosmolar state (HHS), as the former condition is normally associated with hypoglycaemia, hyponatraemia and hypo-osmolality. Decompensated hypothyroidism should be considered in presentations of HHS as well as with other metabolic derangements, as delays in thyroid hormone replacement are associated with poorer outcomes. It has multisystem effects challenging its recognition and we discuss potential complications and their management. 2016 BMJ Publishing Group Ltd.

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