A 68-year-old with a history of hypothyroidism is brought in after being found unresponsive at home during a cold snap; the family reports she ran out of levothyroxine weeks ago. Temperature is 93.8°F, HR 48, BP 84/50, and she is lethargic, responding only to painful stimuli.
Slow, cold, and barely responsive. What is this trend telling you?
Long-standing, untreated hypothyroidism can decompensate into myxedema coma, and cold exposure, infection, medications, and trauma are the classic triggers. Every system that runs slow in ordinary hypothyroidism runs dangerously slow here: the heart rate, the blood pressure, the temperature, and the level of consciousness.
Hypothyroidism itself is a slow-motion condition: fatigue, weight gain, cold intolerance, lethargy. Myxedema coma is that same physiology pushed to its floor, where the slowing becomes life-threatening. The trigger history is often the fastest clue: infection, cold exposure, medication, trauma, or simply going without thyroid hormone.
Oral medication is unreliable here. This patient needs IV hormone and support for the systems already failing, not a pill and a wait-and-see approach.
"She's just cold, warm her up and recheck." A patient this bradycardic, hypotensive, and unresponsive with a hypothyroid history and a missed-medication story needs immediate escalation, not a blanket and a wait.
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