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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Medical Education ](https://mdster.com/blog?category=medical-education) 4. Thyroid Storm and Myxedema Coma: Recognize and Treat in the First Hour [ Medical Education ](https://mdster.com/blog?category=medical-education) Thyroid Storm and Myxedema Coma: Recognize and Treat in the First Hour ======================================================================== Two thyroid extremes that kill fast—here’s the board-relevant, anesthesia-flavored first-hour playbook. [ MDster Editorial Team ](https://mdster.com/about) · Feb 19, 2026 · 6 min read · 98 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Critical Care Anesthesia ](https://mdster.com/blog?tag=critical-care-anesthesia) [ Anesthesiology ](https://mdster.com/blog?tag=anesthesiology) [ Thyroid storm ](https://mdster.com/blog?tag=thyroid-storm) [ Myxedema coma ](https://mdster.com/blog?tag=myxedema-coma) [ Endocrine emergencies ](https://mdster.com/blog?tag=endocrine-emergencies) [ Anesthesiology board review ](https://mdster.com/blog?tag=anesthesiology-board-review) Share this article Share this post On this page 1. [ The mental model: “hot & fast” vs “cold & slow” ](#the-mental-model-hot-fast-vs-cold-slow) 2. [ Thyroid storm: recognize fast, treat in sequence ](#thyroid-storm-recognize-fast-treat-in-sequence) 3. [ Beta blockade and supportive care: control the adrenergic load without crashing the heart ](#beta-blockade-and-supportive-care-control-the-adrenergic-load-without-crashing-the-heart) 4. [ Steroids and endocrine support: cover adrenal reserve, slow T4→T3 ](#steroids-and-endocrine-support-cover-adrenal-reserve-slow-t4t3) 5. [ Temperature management: cool the patient, not with aspirin ](#temperature-management-cool-the-patient-not-with-aspirin) 6. [ Myxedema coma: recognize the “cold, slow” crash ](#myxedema-coma-recognize-the-cold-slow-crash) 7. [ Airway, ventilation, and hemodynamics: the anesthesiologist’s domain ](#airway-ventilation-and-hemodynamics-the-anesthesiologists-domain) 8. [ Steroids first, then thyroid hormone ](#steroids-first-then-thyroid-hormone) 9. [ Temperature management: passive rewarming only ](#temperature-management-passive-rewarming-only) 10. [ Clinical correlations for anesthesiology: how this changes your plan ](#clinical-correlations-for-anesthesiology-how-this-changes-your-plan) 11. [ Key Takeaways ](#key-takeaways) 12. [ Conclusion ](#conclusion) 13. [ References ](#references-heading) On this page 1. [ The mental model: “hot & fast” vs “cold & slow” ](#the-mental-model-hot-fast-vs-cold-slow) 2. [ Thyroid storm: recognize fast, treat in sequence ](#thyroid-storm-recognize-fast-treat-in-sequence) 3. [ Beta blockade and supportive care: control the adrenergic load without crashing the heart ](#beta-blockade-and-supportive-care-control-the-adrenergic-load-without-crashing-the-heart) 4. [ Steroids and endocrine support: cover adrenal reserve, slow T4→T3 ](#steroids-and-endocrine-support-cover-adrenal-reserve-slow-t4t3) 5. [ Temperature management: cool the patient, not with aspirin ](#temperature-management-cool-the-patient-not-with-aspirin) 6. [ Myxedema coma: recognize the “cold, slow” crash ](#myxedema-coma-recognize-the-cold-slow-crash) 7. [ Airway, ventilation, and hemodynamics: the anesthesiologist’s domain ](#airway-ventilation-and-hemodynamics-the-anesthesiologists-domain) 8. [ Steroids first, then thyroid hormone ](#steroids-first-then-thyroid-hormone) 9. [ Temperature management: passive rewarming only ](#temperature-management-passive-rewarming-only) 10. [ Clinical correlations for anesthesiology: how this changes your plan ](#clinical-correlations-for-anesthesiology-how-this-changes-your-plan) 11. [ Key Takeaways ](#key-takeaways) 12. [ Conclusion ](#conclusion) 13. [ References ](#references-heading) You’ll see both of these at the worst possible time: the “Graves’ patient” who rolls into an emergent laparotomy tachycardic, febrile, and agitated… and the “little old lady” post–hip fracture who’s bradycardic, hypothermic, and getting sleepier every minute. In both, anesthesiology owns the first hour—airway, hemodynamics, temperature, and the order of endocrine meds. The mental model: “hot & fast” vs “cold & slow” ------------------------------------------------------- If you remember nothing else, remember **directionality**. Thyroid storm is sympathetic overdrive with heat and tachydysrhythmias; myxedema coma is metabolic shutdown with hypoventilation and hypothermia. Labs confirm thyroid status, but **they don’t buy you permission to wait**. FeatureThyroid stormMyxedema comaTemperature**Hyperthermia** (often dramatic)**Hypothermia** (check a low-reading thermometer)Heart**Tachycardia/AF**, high-output failure**Bradycardia**, low-output failure, pericardial effusion possibleCNSAgitation, delirium, psychosisSomnolence, stupor (often not truly “coma”)VentilationUsually OK early; fatigue later**Hypoventilation/CO₂ retention** is centralBoard pitfall“Wait for labs” / treat fever with aspirin“Sedate them” / actively rewarm them Thyroid storm: recognize fast, treat in sequence ------------------------------------------------ Diagnosis is clinical. Use a scoring tool (e.g., **Burch–Wartofsky**) if it helps you communicate severity, but don’t let it delay treatment. Common perioperative precipitants: **infection, trauma, recent contrast, stopping antithyroid meds, surgery in an inadequately controlled hyperthyroid patient**. Your initial goals are simple: **stop adrenergic injury, stop new hormone, stop release, blunt peripheral conversion, and support failing organs**. ### Beta blockade and supportive care: control the adrenergic load without crashing the heart Start here because most immediate deaths are from **arrhythmia, ischemia, or high-output failure**. - **Beta blockade**: If the patient looks like they could crump with negative inotropy (thyrotoxic cardiomyopathy, shock physiology), don’t be heroic—use **titrated esmolol**. If the patient is stable and you want some **T4→T3 blockade**, **propranolol** is the classic board answer. - **Targets**: aim for a heart rate that restores filling and perfusion (often **~90–110**), not “as low as possible.” - **Supportive care**: oxygen, IV access, cautious fluids (they’re often volume depleted), treat the trigger (antibiotics if infection is plausible), manage AF (often improves as storm improves), and escalate early to ICU-level monitoring. > **Clinical Pearl:** In thyroid storm, *start low and titrate* beta blockade. A big bolus in a patient with occult thyrotoxic cardiomyopathy is a classic way to trade tachycardia for cardiovascular collapse. ### Steroids and endocrine support: cover adrenal reserve, slow T4→T3 Give **stress-dose glucocorticoid** early. It’s doing two jobs: supporting potentially limited adrenal reserve in severe thyrotoxicosis and **reducing peripheral T4→T3 conversion**. Then hit thyroid hormone physiology in the right order: 1. **Thionamide** (PTU or methimazole) to stop new synthesis (PTU also reduces T4→T3, but methimazole is often favored for safety once stabilized). 2. **Iodine** to block hormone release (**after** thionamide). > **Board trap:** **Never give iodine before a thionamide** in suspected thyroid storm unless you are very sure of the etiology and timing—you can worsen hormone synthesis. ### Temperature management: cool the patient, not with aspirin Treat hyperthermia aggressively because it drives oxygen consumption, tachycardia, and end-organ injury. - Use **acetaminophen** and **external cooling** (cooling blankets/ice packs as needed). - **Avoid aspirin/salicylates** (they can increase free thyroid hormone by displacement from binding proteins). - Prevent shivering (which is just thermogenesis you don’t need) with appropriate sedation/analgesia and ventilatory support if required. Myxedema coma: recognize the “cold, slow” crash ----------------------------------------------- Myxedema coma is usually decompensation on top of longstanding hypothyroidism plus a precipitant: **infection, cold exposure, trauma/surgery, sedatives/opiates, stroke, GI bleed**. A scoring system (e.g., **Popoveniuc**) can support the diagnosis, but again: treat the patient in front of you. ### Airway, ventilation, and hemodynamics: the anesthesiologist’s domain This is where patients die: **CO₂ narcosis, aspiration, and shock**. - **Don’t delay intubation** when mental status is deteriorating or PaCO₂ is climbing. Hypothyroid patients are often exquisitely sensitive to sedatives/opioids—dose like they’re 30 years older than they are. - Treat hypotension thoughtfully: they may be intravascularly depleted, but they’re also vasoconstricted with low cardiac output. Use cautious crystalloid boluses, early invasive monitoring if unstable, and vasopressors as needed. - Correct **hypoglycemia** and address **hyponatremia** (often with fluid restriction and isotonic saline; severe symptomatic cases need hypertonic saline under ICU protocols). ### Steroids first, then thyroid hormone In myxedema coma, you can unmask or precipitate adrenal crisis if you replace thyroid hormone into an adrenal-insufficient patient. - **Hydrocortisone first** (stress dosing) while you send cortisol. - Then **IV levothyroxine (T4) loading dose** (dose varies by guideline and patient risk; go lower in the elderly or known CAD). Consider **IV liothyronine (T3)** only in selected patients (e.g., no response, profound instability) because it’s potent and more arrhythmogenic. - Treat the precipitating cause broadly—empiric antibiotics are often reasonable while you’re hunting for infection. ### Temperature management: passive rewarming only This is a favorite exam contrast with thyroid storm. - Use **blankets and passive rewarming**. - Avoid **active peripheral rewarming/warming blankets** that cause vasodilation—these patients are relying on vasoconstriction to maintain perfusion, and sudden vasodilation can precipitate shock. Clinical correlations for anesthesiology: how this changes your plan -------------------------------------------------------------------- If either crisis is on your differential in the perioperative setting, act like you’re already in an ICU. - **Monitoring:** low threshold for arterial line, frequent ABGs (especially myxedema), temperature core monitoring, and aggressive electrolyte/glucose checks. - **Drug selection:** avoid sympathetic stimulants in storm when possible; avoid long-acting sedatives and “normal doses” of opioids in myxedema. - **Disposition:** both belong in ICU. “PACU until awake” is not a plan. Key Takeaways ------------- - **Thyroid storm = hot & fast.** Treat clinically: **beta blocker → thionamide → iodine → steroids**, plus aggressive supportive care. - **Myxedema coma = cold & slow.** Secure the **airway early**, give **hydrocortisone before T4**, correct glucose/sodium, and treat triggers. - **Temperature:** storm gets **acetaminophen + external cooling** (avoid aspirin); myxedema gets **passive rewarming only** (avoid active peripheral warming). - **Boards love order-of-operations** (iodine after thionamide; steroids before thyroid hormone in myxedema) and the perioperative triggers. Conclusion ---------- These crises aren’t subtle when you train your eye: one patient is metabolically on fire, the other is shutting down. In both, your first hour should look like a bundled resuscitation—**beta blockade/support** for storm, **airway/steroids** for myxedema, and disciplined temperature management for both. References (5) ------------------ 1. 1. [ www.ncbi.nlm.nih.gov/sites/books/NBK278927 ](https://www.ncbi.nlm.nih.gov/sites/books/NBK278927/) 2. 2. [ pubmed.ncbi.nlm.nih.gov/27521067 ](https://pubmed.ncbi.nlm.nih.gov/27521067/) 3. 3. [ www.ncbi.nlm.nih.gov/sites/books/NBK279007 ](https://www.ncbi.nlm.nih.gov/sites/books/NBK279007/) 4. 4. [ pubmed.ncbi.nlm.nih.gov/25266247 ](https://pubmed.ncbi.nlm.nih.gov/25266247/) 5. 5. [ www.ncbi.nlm.nih.gov/books/NBK545193 ](https://www.ncbi.nlm.nih.gov/books/NBK545193/) Next Build momentum in Anesthesiology with focused, exam‑style practice -------------------------------------------------------------------- - Airway, ventilation, and crisis drills - High‑yield anesthesia pharmacology made practical - Track weak topics and improve faster [ Start practicing ](https://mdster.com/user/dashboard) [ Anesthesiology ](https://mdster.com/speciality/anesthesiology) [ View pricing ](https://mdster.com/pricing) [ Explore features ](https://mdster.com/features) No credit card required. 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Explore topics: [ # Critical Care Anesthesia ](https://mdster.com/blog?tag=critical-care-anesthesia) [ # Anesthesiology ](https://mdster.com/blog?tag=anesthesiology) [ # Thyroid storm ](https://mdster.com/blog?tag=thyroid-storm) [ # Myxedema coma ](https://mdster.com/blog?tag=myxedema-coma) [ # Endocrine emergencies ](https://mdster.com/blog?tag=endocrine-emergencies) [ # Anesthesiology board review ](https://mdster.com/blog?tag=anesthesiology-board-review) [ Back to all posts ](https://mdster.com/blog) Discussion () ----------------- Join the discussion [ Log in ](https://mdster.com/auth/login) or [ Sign up ](https://mdster.com/auth/register) No comments yet Be the first to share your thoughts! ![]() More in Medical Education ------------------------- [ See all ](https://mdster.com/blog?category=medical-education) [### Multimodal Analgesia for Safer Postoperative Pain Plans 5 min read May 22, 2026 ](https://mdster.com/blog/multimodal-analgesia-for-safer-postoperative-pain-plans) [### Serotonin Syndrome and NMS Treatment in Emergency Medicine 5 min read May 21, 2026 ](https://mdster.com/blog/serotonin-syndrome-and-nms-treatment-in-emergency-medicine) [### HPA Axis and Cortisol Dynamics in Depression and PTSD 5 min read May 20, 2026 ](https://mdster.com/blog/hpa-axis-and-cortisol-dynamics-in-depression-and-ptsd) Related Posts ------------- [ ![Multimodal Analgesia for Safer Postoperative Pain Plans](https://mdster.com/storage/blog/images/multimodal-analgesia-for-safer-postoperative-pain-plans.jpg) Medical Education ### Multimodal Analgesia for Safer Postoperative Pain Plans Learn how to build safer postoperative multimodal analgesia plans using acetaminophen, NSAIDs, regional anesthesia, opioids, gabapentinoids, ketamine, and lidocaine. 5 min read 0 comments ](https://mdster.com/blog/multimodal-analgesia-for-safer-postoperative-pain-plans) [ ![Serotonin Syndrome and NMS Treatment in Emergency Medicine](https://mdster.com/storage/blog/images/serotonin-syndrome-and-nms-treatment-in-emergency-medicine.jpg) Medical Education ### Serotonin Syndrome and NMS Treatment in Emergency Medicine Treat serotonin syndrome and NMS with the right ED priorities: stop offending agents, use benzodiazepines, cool early, and know cyproheptadine’s limits. 5 min read 0 comments ](https://mdster.com/blog/serotonin-syndrome-and-nms-treatment-in-emergency-medicine) [ ![HPA Axis and Cortisol Dynamics in Depression and PTSD](https://mdster.com/storage/blog/images/hpa-axis-and-cortisol-dynamics-in-depression-and-ptsd.jpg) Medical Education ### HPA Axis and Cortisol Dynamics in Depression and PTSD Master HPA axis feedback loops, cortisol rhythms, depression hypercortisolemia, and PTSD cortisol patterns for clinical psychiatry and board exams. 5 min read 0 comments ](https://mdster.com/blog/hpa-axis-and-cortisol-dynamics-in-depression-and-ptsd) [ ![Lower Genital Tract Lymphatics: Cervix and Vulva Drainage](https://mdster.com/storage/blog/images/lower-genital-tract-lymphatics-cervix-and-vulva-drainage.jpg) Medical Education ### Lower Genital Tract Lymphatics: Cervix and Vulva Drainage Master cervix and vulva lymphatic drainage patterns, including pelvic, obturator, iliac, and inguinal node spread in gynecologic malignancy. 4 min read 0 comments ](https://mdster.com/blog/lower-genital-tract-lymphatics-cervix-and-vulva-drainage) [ ![American Osteopathic Board of Anesthesiology (Oral Exam): Study Tips That Work](https://mdster.com/storage/blog/images/american-osteopathic-board-of-anesthesiology-oral-exam-study-tips-that-work.jpg) Study Tips ### American Osteopathic Board of Anesthesiology (Oral Exam): Study Tips That Work Prepare for the AOBA Oral Exam with a focused plan for timed cases, oral reasoning, high-yield anesthetic management, and remote proctoring. 5 min read 0 comments ](https://mdster.com/blog/american-osteopathic-board-of-anesthesiology-oral-exam-study-tips-that-work) [ ![Initial Severity Assessment: Safe Disposition in Family Medicine](https://mdster.com/storage/blog/images/initial-severity-assessment-safe-disposition-in-family-medicine.jpg) Medical Education ### Initial Severity Assessment: Safe Disposition in Family Medicine A board-focused guide to deciding who is sick, who needs EMS or ED transfer, and who can be safely managed as an outpatient in family medicine. 2 min read 0 comments ](https://mdster.com/blog/initial-severity-assessment-safe-disposition-in-family-medicine) [ MDster home ](/ "MDster home") Master your medical exams with evidence-based learning. 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