Thyroid Emergencies & Disorders
From thyroid storm to myxedema coma — a holistic clinical framework for the GP’s OPD and the postgraduate entrance aspirant’s notebook.
A note on format. This is not a Daily Clinical Pearl — it is a longer, deeper note. Clinical pearls are built for a two-minute read; this one is built for a reading session. We have kept it here on the Daily Clinical Pearl feed because it is free and freely accessible to every Basic member, but expect a thorough, textbook-grade walkthrough rather than a single insight. Save it, come back to it, read it in parts.
A febrile Graves’ patient taken to the operating theatre before adequate pre-operative preparation. A 60-year-old widow found unconscious at home two days after starting antibiotics for a UTI. A septic patient whose TSH is suddenly suppressed. A young woman on an Ayurvedic weight-loss supplement presenting with palpitations she cannot explain.
Four patients. Four different thyroid pathways. The GP who can place each one on the thyroid axis — hormone production, peripheral conversion, feedback loop, exogenous source — manages all four correctly. The GP who cannot will miss at least one.
What This Note Covers
- Thyroid storm — triggers (intraoperative, intercurrent illness, radioactive iodine ablation), clinical features across four organ systems, and the Burch-Wartofsky score with interpretation thresholds.
- Primary medications in storm — PTU vs Methimazole logic, propranolol vs esmolol in cardiac compromise, and why hydrocortisone is life-saving in every endocrine emergency.
- Supportive therapies — SSKI / Lugol’s iodine and the Wolff-Chaikoff effect, cholestyramine for circulating hormone, physical cooling, and acid-base correction.
- Wolff-Chaikoff vs Jod-Basedow — two diametrically opposite responses to iodine intake; which one you exploit clinically and which one you diagnose epidemiologically.
- Thyrotoxicosis factitia — contaminated meat, mislabelled Ayurvedic supplements, and how to distinguish it from Jod-Basedow on history and biochemistry.
- Hyperthyroidism — full workup — primary vs secondary causes, Graves’ ophthalmopathy and the NO SPECS scheme, Pemberton’s sign, thyroid scan patterns, and treatment (I-131, antithyroid drugs, surgery).
- Hypothyroidism — full workup — primary vs secondary, clinical features across eight systems, the GI paradox (diarrhoea in hyper, constipation in hypo), and levothyroxine dosing including the angina caveat.
- Myxedema coma — triggers, clinical and lab findings, the three-pronged treatment (rewarm, T3/T4, hydrocortisone), and a worked clinical case.
- Euthyroid sick syndrome — the T3 drop in severe illness, the D1 deiodinase mechanism, and the key differentiator from myxedema coma.
- Hypothyroidism as a cause of macrocytic anaemia — the frequently forgotten differential that comes up repeatedly in PG entrance questions.
- Summary tables — side-by-side comparison of thyroid storm, myxedema coma, and euthyroid sick syndrome, plus the full thyroid hormone pathway from TRH to peripheral T3.
Who This Note Is For
The Working GP
For the general physician who needs to recognise a thyroid emergency in the OPD, start safe bridging therapy before referral, and make the right call on which lab pattern means what. The holistic view of the thyroid axis helps you stop treating “a high TSH” and start treating the patient sitting in front of you.
The Postgraduate Aspirant
For the intern or resident preparing for NEET-PG, INI-CET, or FMGE. This note is structured around the high-yield distinctions these exams love — Wolff-Chaikoff vs Jod-Basedow, thyrotoxicosis vs hyperthyroidism, NO SPECS, Burch-Wartofsky, euthyroid sick syndrome vs myxedema coma. Read it once for understanding; come back to the summary tables during revision.
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