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cardio.hypertensive-emergency.thyroid-storm-overlap.v1PRODUCTION
cardio.hypertensive-emergency.thyroid-storm-overlap.v1

Thyroid storm with HTN-emergency overlap (BWPS ≥45 + AFib-RVR + HF + AMS)

cardiologyacuteadult
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10/12 authored

Canonical 12-phase frame with authored status for this dossier.

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Detailed

Thyroid storm with HTN-emergency overlap = catecholamine + thyroid hormone excess + autonomic instability + dehydration → severe HTN + AFib-RVR + decompensated HF + hyperthermia + AMS in patient with hyperthyroidism (Graves, toxic MNG, toxic adenoma, RAI exposure) + identifiable precipitant. Pharmacology pivot: BB FIRST IV (propranolol or esmolol — blunts adrenergic surge + reduces T4→T3 conversion); thionamide PTU PREFERRED in storm (additional T4→T3 block); potassium iodide (Lugol or SSKI) ≥1 h AFTER thionamide (avoids substrate loading); HYDROCORTISONE 100 mg IV q8h (block T4→T3 + cover relative adrenal insufficiency); cholestyramine 4 g PO QID (binds enterohepatic T4); aggressive cooling; AVOID ASA (displaces T4 from TBG). Route to parent engine for shared HTN-emergency arc; this dossier owns the thyroid-cascade pharmacology + multi-organ assessment.

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Advance rule
Set
Advance when

BWPS ≥45 OR Akamizu definite criteria + HTN crisis confirmed

Patient inputs (12)

Older patients with thyroid storm have higher HF + AFib + mortality (Akamizu Thyroid 2012 PMID 22651576)

Confirms thyroid storm biochemistry — TSH suppressed + free T4 + free T3 elevated; magnitude does not differentiate storm from severe hyperthyroidism (clinical scoring drives dx)

Hepatic involvement (jaundice, transaminitis) component of BWPS; PTU-related hepatotoxicity baseline

Renal function for drug dosing; volume status for diuresis

Baseline WBC for thionamide agranulocytosis monitoring + infection screen

AFib detection + RVR + ischemia screening + QTc baseline

Severe HTN component of crisis; drives BB titration; classic pattern: wide pulse pressure + systolic HTN from increased cardiac output

Component of MAP; pulse pressure widening characteristic of thyrotoxic state

Sinus tachy or AFib-RVR; HR >130 contributes to BWPS ≥45 storm criteria; drives BB urgency

Hyperthermia >38.5 contributes to BWPS; >40 is life-threatening; drives cooling + BB strategy

AMS / agitation / coma contributes to BWPS CNS scoring; drives ICU triage urgency

LV function (high-output failure, cardiomyopathy); RV strain; valvular; pericardial effusion

* = hard-required. Engine cannot meaningfully run until these are filled.

Severity triggers (5)

5 need judgement
  • informationallife_threateningstorm_with_refractory_hyperthermia_above_40
    Thyroid storm + temperature >40 unresponsive to acetaminophen + cooling × 2 h — life-threatening hyperthermia
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningPTU_induced_fulminant_hepatotoxicity
    PTU + new RUQ pain + bili rise + transaminitis >3x ULN — fulminant hepatotoxicity (~0.1-0.2% on PTU)
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningthionamide_induced_agranulocytosis
    PTU or methimazole + ANC <500 (agranulocytosis ~0.3% incidence) ± fever, sore throat, infection
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningstorm_with_AFib_RVR_and_HF_decompensation
    Thyroid storm + AFib with RVR + decompensated HF (pulm edema, hypoxia, ↑lactate) — high-output to decompensated transition
    Trigger could not be auto-evaluated — needs clinician judgement.
  • informationallife_threateningstorm_with_PRES_or_stroke
    Storm + new neurologic symptoms (HA, vision change, AMS, focal deficit) — PRES or stroke from severe HTN component
    Trigger could not be auto-evaluated — needs clinician judgement.

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Recommended regimen

Thyroid storm with HTN-emergency overlap — sequenced cascade: BB FIRST → THIONAMIDE → IODINE ≥1 h after → HYDROCORTISONE → CHOLESTYRAMINE; AVOID ASA + amiodarone
axis: thyroid_storm_overlap_cascade_pharmacology
Selected axis "Thyroid storm with HTN-emergency overlap — sequenced cascade: BB FIRST → THIONAMIDE → IODINE ≥1 h after → HYDROCORTISONE → CHOLESTYRAMINE; AVOID ASA + amiodarone" by default fallback (first axis)
  • propranolol
    first line
    non_selective_beta_blocker
    1-2 mg IV q15 min titrate to HR <100 + BP control; transition to 60-80 mg PO q4h once tolerated • IV then PO • q15 min IV / q4h PO
    triggers: thyroid_storm_with_hypertension_or_AFib_RVR
    ATA 2016 PMID 27521067 — non-selective BB preferred (also blocks peripheral T4→T3 conversion); blunts adrenergic surge driving HTN + AFib + tremor + hyperthermia
    rxcui 8787
  • esmolol
    first line
    beta1_selective_blocker
    500 mcg/kg IV bolus over 1 min, then 50-300 mcg/kg/min infusion titrate • IV • continuous
    triggers: thyroid_storm_with_HF_or_asthma_or_unstable_hemodynamics
    ATA 2016 — short half-life (~9 min) allows rapid titration + reversibility if HF/asthma intolerance; preferred in unstable patients
    rxcui 203222
  • PTU (propylthiouracil)
    first line
    thionamide
    500-1000 mg PO/NG/PR loading dose, then 200-250 mg q4h • PO/NG/PR • q4h
    triggers: thyroid_storm_acute
    ATA 2016 PMID 27521067 — PTU PREFERRED in storm (additional peripheral T4→T3 conversion block via D1 deiodinase inhibition); methimazole superior outside storm but PTU rapid block essential here; monitor LFT for hepatotox
    rxcui 8794
  • methimazole
    second line
    thionamide
    60-80 mg PO/NG load, then 30-40 mg q6h • PO/NG • q6h
    triggers: PTU_intolerant_or_PTU_hepatotoxicity
    ATA 2016 — alternative when PTU intolerant; less hepatotox, longer half-life; lacks T4→T3 block but acceptable when transitioning out of storm
    rxcui 6835
  • potassium iodide (Lugol)
    first line
    iodine_inorganic
    5 drops (250 mg) PO q8h — START ≥1 h AFTER first thionamide dose • PO • q8h
    triggers: thyroid_storm_acute_post_thionamide
    ATA 2016 PMID 27521067 — Wolff-Chaikoff effect blocks hormone release; CRITICAL TIMING: must follow thionamide ≥1 h to avoid substrate loading worsening storm
    rxcui 8597
  • hydrocortisone
    first line
    glucocorticoid
    300 mg IV load, then 100 mg IV q8h • IV • q8h
    triggers: thyroid_storm_acute
    ATA 2016 — blocks T4→T3 conversion + covers relative adrenal insufficiency (catechol-mediated cortisol consumption); empiric for any storm
    rxcui 5492
  • cholestyramine
    add on
    bile_acid_sequestrant
    4 g PO QID • PO • QID
    triggers: thyroid_storm_severe_or_refractory
    Binds enterohepatic T4 circulation → reduces serum hormone; useful adjunct in severe storm or PTU-intolerant; ATA 2016 mention
    rxcui 2447
  • nicardipine
    second line
    DHP_CCB
    5 mg/h IV titrate by 2.5 mg/h q5-15 min, max 15 mg/h • IV • continuous
    triggers: storm_with_persistent_HTN_after_BB_titration
    Adjunct for refractory HTN after maximal BB; CCB acceptable in storm but less data; AVOID non-DHP CCB (verapamil/diltiazem) if HF
    rxcui 7396
  • acetaminophen
    first line
    antipyretic_non_NSAID
    650-1000 mg PO/PR q4-6h • PO/PR • q4-6h
    triggers: storm_hyperthermia
    ATA 2016 — acetaminophen for hyperthermia (NOT ASA — displaces T4 from TBG); aggressive cooling priority
    rxcui 161
  • AVOID aspirin (ASA)
    contraindication substitute
    do_not_use
    AVOID • N/A • N/A
    triggers: thyroid_storm_diagnosis
    ATA 2016 PMID 27521067 — ASA displaces T4 from thyroxine-binding globulin (TBG) → increases FREE thyroid hormone → worsens storm; absolute contraindication for fever
  • AVOID amiodarone
    contraindication substitute
    do_not_use
    AVOID • N/A • N/A
    triggers: thyroid_storm_with_AFib_RVR
    Amiodarone is iodine-rich → worsens hyperthyroidism (~37% iodine by weight); use BB for rate control + cardioversion if needed; lidocaine acceptable if VT
  • AVOID over-aggressive cooling causing shivering
    contraindication substitute
    do_not_use
    AVOID shivering response • N/A • N/A
    triggers: storm_hyperthermia_management
    Shivering generates catecholamine surge worsening HTN + tachy + heat production; sedate (benzodiazepines) + cool with evaporation/cooling blankets at controlled rate
  • Plasmapheresis if refractory
    rescue
    extracorporeal_therapy
    Per nephrology / apheresis service • extracorporeal • as needed
    triggers: storm_refractory_to_cascade_72h
    ATA 2016 — plasmapheresis can rapidly reduce circulating thyroid hormone in refractory storm; bridge to definitive thyroidectomy

outpatient playbook — drug actions (3)

  1. 1. lifelong levothyroxine post-definitive
    rxcui 10582
    Levothyroxine 1.6 mcg/kg/d titrate to TSH 0.5-2.5 • PO • daily
    trigger: Post-RAI or post-thyroidectomy
    ATA 2016 — lifelong replacement
  2. 2. continue AF AC if persistent
    rxcui 1364430
    Apixaban 5 mg PO BID • PO • BID
    trigger: Persistent AF + CHA2DS2-VASc ≥2
    ACC/AHA 2023 AF
  3. 3. GDMT if cardiomyopathy persists
    Per cardiology — ARNI/BB/MRA/SGLT2i • PO • as scheduled
    trigger: Persistent HFrEF
    AHA 2022 HF

Auto-drafted A&P note

outpatient

Subjective

- Possible entry pathways: Hyperthermia (>38.5) + tachyarrhythmia (HR >130 or AFib-RVR) + HTN crisis + HF signs + AMS in known/suspected hyperthyroid patient (Burch-Wartofsky ≥45 — Burch & Wartofsky 1993 PMID 8325286); Graves disease or toxic multinodular goiter + recent precipitant (infection, surgery, contrast load, RAI, parturition, trauma, DKA) + new severe HTN; TSH <0.01 + free T4 + free T3 markedly elevated + clinical pentad — biochemical confirmation of thyroid storm.

Objective

- No vitals, labs, or imaging entered for this encounter.

Assessment

**Thyroid storm with HTN-emergency overlap (BWPS ≥45 + AFib-RVR + HF + AMS)** (cardio.hypertensive-emergency.thyroid-storm-overlap.v1).
Scope: Thyroid storm with HTN-emergency overlap = catecholamine + thyroid hormone excess + autonomic instability + dehydration → severe HTN + AFib-RVR + decompensated HF + hyperthermia + AMS in patient with hyperthyroidism (Graves, toxic MNG, toxic adenoma, RAI exposure) + identifiable precipitant. Pharmacology pivot: BB FIRST IV (propranolol or esmolol — blunts adrenergic surge + reduces T4→T3 conversion); thionamide PTU PREFERRED in storm (additional T4→T3 block); potassium iodide (Lugol or SSKI) ≥1 h AFTER thionamide (avoids substrate loading); HYDROCORTISONE 100 mg IV q8h (block T4→T3 + cover relative adrenal insufficiency); cholestyramine 4 g PO QID (binds enterohepatic T4); aggressive cooling; AVOID ASA (displaces T4 from TBG). Route to parent engine for shared HTN-emergency arc; this dossier owns the thyroid-cascade pharmacology + multi-organ assessment.

No severity triggers fired against current inputs.

Plan

Regimen axis: **Thyroid storm with HTN-emergency overlap — sequenced cascade: BB FIRST → THIONAMIDE → IODINE ≥1 h after → HYDROCORTISONE → CHOLESTYRAMINE; AVOID ASA + amiodarone**.
1. propranolol 1-2 mg IV q15 min titrate to HR <100 + BP control; transition to 60-80 mg PO q4h once tolerated IV then PO q15 min IV / q4h PO (non_selective_beta_blocker, first line) — ATA 2016 PMID 27521067 — non-selective BB preferred (also blocks peripheral T4→T3 conversion); blunts adrenergic surge driving HTN + AFib + tremor + hyperthermia
2. esmolol 500 mcg/kg IV bolus over 1 min, then 50-300 mcg/kg/min infusion titrate IV continuous (beta1_selective_blocker, first line) — ATA 2016 — short half-life (~9 min) allows rapid titration + reversibility if HF/asthma intolerance; preferred in unstable patients
3. PTU (propylthiouracil) 500-1000 mg PO/NG/PR loading dose, then 200-250 mg q4h PO/NG/PR q4h (thionamide, first line) — ATA 2016 PMID 27521067 — PTU PREFERRED in storm (additional peripheral T4→T3 conversion block via D1 deiodinase inhibition); methimazole superior outside storm but PTU rapid block essential here; monitor LFT for hepatotox
4. methimazole 60-80 mg PO/NG load, then 30-40 mg q6h PO/NG q6h (thionamide, second line) — ATA 2016 — alternative when PTU intolerant; less hepatotox, longer half-life; lacks T4→T3 block but acceptable when transitioning out of storm
5. potassium iodide (Lugol) 5 drops (250 mg) PO q8h — START ≥1 h AFTER first thionamide dose PO q8h (iodine_inorganic, first line) — ATA 2016 PMID 27521067 — Wolff-Chaikoff effect blocks hormone release; CRITICAL TIMING: must follow thionamide ≥1 h to avoid substrate loading worsening storm
6. hydrocortisone 300 mg IV load, then 100 mg IV q8h IV q8h (glucocorticoid, first line) — ATA 2016 — blocks T4→T3 conversion + covers relative adrenal insufficiency (catechol-mediated cortisol consumption); empiric for any storm
7. cholestyramine 4 g PO QID PO QID (bile_acid_sequestrant, add on) — Binds enterohepatic T4 circulation → reduces serum hormone; useful adjunct in severe storm or PTU-intolerant; ATA 2016 mention
8. nicardipine 5 mg/h IV titrate by 2.5 mg/h q5-15 min, max 15 mg/h IV continuous (DHP_CCB, second line) — Adjunct for refractory HTN after maximal BB; CCB acceptable in storm but less data; AVOID non-DHP CCB (verapamil/diltiazem) if HF
9. acetaminophen 650-1000 mg PO/PR q4-6h PO/PR q4-6h (antipyretic_non_NSAID, first line) — ATA 2016 — acetaminophen for hyperthermia (NOT ASA — displaces T4 from TBG); aggressive cooling priority
10. AVOID aspirin (ASA) AVOID N/A N/A (do_not_use, contraindication substitute) — ATA 2016 PMID 27521067 — ASA displaces T4 from thyroxine-binding globulin (TBG) → increases FREE thyroid hormone → worsens storm; absolute contraindication for fever
11. AVOID amiodarone AVOID N/A N/A (do_not_use, contraindication substitute) — Amiodarone is iodine-rich → worsens hyperthyroidism (~37% iodine by weight); use BB for rate control + cardioversion if needed; lidocaine acceptable if VT
12. AVOID over-aggressive cooling causing shivering AVOID shivering response N/A N/A (do_not_use, contraindication substitute) — Shivering generates catecholamine surge worsening HTN + tachy + heat production; sedate (benzodiazepines) + cool with evaporation/cooling blankets at controlled rate
13. Plasmapheresis if refractory Per nephrology / apheresis service extracorporeal as needed (extracorporeal_therapy, rescue) — ATA 2016 — plasmapheresis can rapidly reduce circulating thyroid hormone in refractory storm; bridge to definitive thyroidectomy

Setting playbook (outpatient) — Lifelong endocrinology — definitive RAI or thyroidectomy → lifelong levothyroxine; cardiology if AF persists or cardiomyopathy; AVOID future precipitants; family screening for autoimmune thyroid
14. lifelong levothyroxine post-definitive Levothyroxine 1.6 mcg/kg/d titrate to TSH 0.5-2.5 PO daily — Post-RAI or post-thyroidectomy (ATA 2016 — lifelong replacement)
15. continue AF AC if persistent Apixaban 5 mg PO BID PO BID — Persistent AF + CHA2DS2-VASc ≥2 (ACC/AHA 2023 AF)
16. GDMT if cardiomyopathy persists Per cardiology — ARNI/BB/MRA/SGLT2i PO as scheduled — Persistent HFrEF (AHA 2022 HF)

Non-pharmacologic actions:
- Annual endocrine + cardiology if needed
- Patient education: avoid iodine load (contrast, amiodarone, kelp/seaweed supplements)
- Family screening for Graves antibodies
- MedicAlert

AVOID / contraindication checks:
- ASA_avoid_in_thyroid_storm_displaces_T4_from_TBG (ATA 2016 PMID 27521067)
- Amiodarone_avoid_in_thyroid_storm_iodine_load (ATA 2016)
- Potassium_iodide_must_follow_thionamide_by_1h_minimum (ATA 2016)
- Beta_agonist_bronchodilator_avoid_in_storm (catechol surge)
- Propranolol_caution_in_decompensated_HF — use esmolol short acting
- PTU_hold_for_LFT_rise_>3x_ULN_or_jaundice (hepatotox warning)
- Thionamide_hold_for_ANC_below_500 (agranulocytosis)

Monitoring

Regimen monitoring:
- arterial line q15-60min BP during acute phase
- continuous ECG for AFib rate RVR and QTc
- continuous temperature with cooling titration
- q4-6h BMP Mg Ca glucose
- daily LFT during PTU (hepatotox)
- q3d CBC with diff (thionamide agranulocytosis screen)
- free T4 T3 q24h until normalizing then q48-72h
- daily neuro exam (storm CNS resolution)
- echo at baseline and post-stabilization

Setting (outpatient) monitoring:
- Quarterly TFT initially → annual once stable
- Annual ECG + echo if cardiomyopathy

Follow-up plan: Definitive thyroid therapy when euthyroid (4-6 wk) — RAI ablation OR thyroidectomy (surgery preferred if compressive goiter, suspicious nodule, severe ophthalmopathy, pregnancy plans, or RAI failure); lifelong levothyroxine post-definitive; endocrinology long-term; AVOID future precipitants (educate); MedicAlert; family screening for autoimmune thyroid
- Close-out criterion: definitive therapy plan + lifelong endocrine follow-up booked

Monitoring phase: A-line BP q15-60 min; continuous ECG + temperature; q4-6h BMP + Mg + Ca; daily LFT (PTU hepatotox); q3d CBC with diff (thionamide agranulocytosis); free T4 + T3 q24h to track normalization; daily neuro exam; precipitant resolution tracking

Disposition

Current setting: outpatient — Lifelong endocrinology — definitive RAI or thyroidectomy → lifelong levothyroxine; cardiology if AF persists or cardiomyopathy; AVOID future precipitants; family screening for autoimmune thyroid

Disposition criteria:
- Long-term continuation; cross-link to endo.thyroid for chronic management; cardio.afib.core.v1 if AF persists; cardio.hf.core.v1 if HFrEF

Escalation triggers (move to higher acuity):
- TSH drift → levothyroxine adjustment
- New AF → cardiology + AC review
- Future precipitant exposure (contrast etc.) → endo alert

Earlier-Return Triggers

Return-precaution thresholds (watch for):
- [LIFE_THREATENING] Thyroid storm + temperature >40 unresponsive to acetaminophen + cooling × 2 h — life-threatening hyperthermia
- [LIFE_THREATENING] PTU + new RUQ pain + bili rise + transaminitis >3x ULN — fulminant hepatotoxicity (~0.1-0.2% on PTU)
- [LIFE_THREATENING] PTU or methimazole + ANC <500 (agranulocytosis ~0.3% incidence) ± fever, sore throat, infection

Citations

- ATA 2016 Hyperthyroidism / Thyrotoxicosis Management (Ross Thyroid PMID 27521067) + Burch-Wartofsky 1993 (PMID 8325286) + 2025 ACC/AHA HTN (Whelton) [PMID:27521067](https://pubmed.ncbi.nlm.nih.gov/27521067/)
- Cited evidence (PMID 8325286) [PMID:8325286](https://pubmed.ncbi.nlm.nih.gov/8325286/)
- Cited evidence (PMID 17314344) [PMID:17314344](https://pubmed.ncbi.nlm.nih.gov/17314344/)
- Cited evidence (PMID 22651576) [PMID:22651576](https://pubmed.ncbi.nlm.nih.gov/22651576/)
- Cited evidence (PMID 27098876) [PMID:27098876](https://pubmed.ncbi.nlm.nih.gov/27098876/)

Last reconciled with current guidelines: 2026-05-15.
References
  • ATA 2016 Hyperthyroidism / Thyrotoxicosis Management (Ross Thyroid PMID 27521067) + Burch-Wartofsky 1993 (PMID 8325286) + 2025 ACC/AHA HTN (Whelton) — PMID:27521067
  • Cited evidence (PMID 8325286) — PMID:8325286
  • Cited evidence (PMID 17314344) — PMID:17314344
  • Cited evidence (PMID 22651576) — PMID:22651576
  • Cited evidence (PMID 27098876) — PMID:27098876