2 learning resources available for this topic
Myxedema coma is a life-threatening endocrine emergency representing the most severe form of hypothyroidism, characterized by profound metabolic decompensation and altered mental status. This rare condition typically occurs in elderly patients with long-standing, untreated hypothyroidism and carries a mortality rate of 20-50% despite treatment.
The condition results from severe thyroid hormone deficiency leading to decreased cellular metabolism, reduced thermogenesis, and impaired cardiovascular function. Precipitating factors such as infection, medications, or environmental stress can trigger acute decompensation in patients with chronic hypothyroidism, resulting in hypothermia, hypoventilation, and multi-organ dysfunction.
Diagnosis requires high clinical suspicion as patients present with hypothermia, altered consciousness, bradycardia, and hypoventilation rather than frank coma. Immediate treatment with intravenous levothyroxine and supportive care is essential, as waiting for confirmatory thyroid function tests can be fatal given the rapid clinical deterioration and high mortality rate.