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Thyrotoxicosis

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THYROID STORM โ€“ INDIA

EMERGENCY MANAGEMENT GUIDELINE


๐Ÿ“‹ For Healthcare Professionals Only | Not for Public Use
Scope: Recognition | Diagnosis | Emergency Management | ICU Care | Monitoring
Format: Stepwise, action-oriented
Note: This is a MEDICAL EMERGENCY with mortality of 10-30% even with treatment. Early recognition and aggressive management are critical.

๐Ÿ”ฐ SYMBOL LEGEND

Symbol Meaning
โœ… Recommended / First-line
โš ๏ธ Caution / Monitor
โŒ Contraindicated / Avoid
๐Ÿ’Š Drug name
๐Ÿ‡ฎ๐Ÿ‡ณ India-specific consideration
๐Ÿ“Œ Key point
โžก๏ธ Next step
๐Ÿšจ Emergency / Critical

SECTION 1: OVERVIEW


1.1 DEFINITION

๐Ÿšจ Thyroid Storm (Thyrotoxic Crisis) = A life-threatening, decompensated state of severe thyrotoxicosis characterized by multi-organ dysfunction and high mortality.

1.2 KEY POINTS

Point
Medical emergency requiring ICU admission
Mortality 10-30% even with optimal treatment
Clinical diagnosis โ€“ Do NOT wait for lab confirmation
Biochemical severity does NOT correlate with clinical severity
Rapid, aggressive, multimodal treatment is essential
Usually occurs in patients with pre-existing thyrotoxicosis
Almost always has an identifiable precipitant

1.3 PATHOPHYSIOLOGY

Mechanism
UNDERLYING THYROTOXICOSIS
(Often undiagnosed or undertreated)
โ”‚
โ–ผ
PRECIPITATING EVENT
(Infection, Surgery, Trauma, etc.)
โ”‚
โ–ผ
โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ดโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”
โ”‚ โ”‚
โ–ผ โ–ผ
↑↑ Catecholamine ↑↑ Thyroid Hormone
Sensitivity Action/Release
โ”‚ โ”‚
โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ฌโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜
โ”‚
โ–ผ
MULTI-ORGAN FAILURE
โ€ข Cardiovascular collapse
โ€ข CNS dysfunction
โ€ข Hyperthermia
โ€ข GI/Hepatic failure
โ”‚
โ–ผ
DEATH (if untreated)
Key Pathophysiological Features
Feature Mechanism
Hyperthermia
↑↑ Metabolic rate; ↓ Heat dissipation
Cardiovascular
↑↑ Chronotropy/Inotropy; Vasodilation; High-output failure
CNS
Direct CNS effects; Hyperthermia; Cerebral hypoxia
GI/Hepatic
Hypoperfusion; Direct toxic effects
Adrenal
Relative insufficiency (↑ Cortisol clearance)

SECTION 2: ETIOLOGY AND PRECIPITANTS


2.1 UNDERLYING CAUSES OF THYROTOXICOSIS

Cause Frequency
Gravesโ€™ disease
Most common (60-80%)
Toxic multinodular goiter Common
Toxic adenoma Less common
Drug-induced (Amiodarone) Increasing
Thyroiditis Rare to cause storm
TSH-secreting adenoma Rare
Struma ovarii Rare
Functioning thyroid cancer metastases Very rare

2.2 PRECIPITATING FACTORS

๐Ÿ“Œ Almost always an identifiable precipitant โ€“ Search for it!
Common Precipitants
Category Precipitant
Infection ๐Ÿšจ
Most common (respiratory, UTI, sepsis)
Surgery
Especially thyroid surgery in unprepared patient
Trauma
Including burns
Acute illness
MI, Stroke, PE, DKA
Medication
ATD withdrawal; Amiodarone; Iodinated contrast
Obstetric
Labor and delivery; Cesarean section; Preeclampsia
Other Precipitants
Category Precipitant
RAI therapy
Radiation thyroiditis (rare)
Vigorous thyroid palpation
Rare
Iodine load
Contrast media; Amiodarone
Drugs
Sympathomimetics; Pseudoephedrine
Stress
Emotional; Physical
Poor compliance
ATD discontinuation
Direct thyroid injury
Biopsy; Surgery
India-Specific Precipitants
Precipitant Notes
Infection
Remains most common; TB, Tropical infections
Untreated/Undertreated hyperthyroidism
Common due to delayed presentation
Non-compliance
Cost; Access issues
Surgery in unprepared patient
Inadequate pre-operative preparation
Iodinated contrast
Increasing CT use without screening

SECTION 3: CLINICAL FEATURES


3.1 CARDINAL FEATURES

Feature Description
๐Ÿšจ Hyperthermia
Temperature > 38.5°C, often > 40°C
๐Ÿšจ Tachycardia
Out of proportion; HR > 140 bpm; Atrial fibrillation
๐Ÿšจ Altered mental status
Agitation → Delirium → Psychosis → Coma
๐Ÿšจ Cardiovascular dysfunction
AF, Heart failure, Shock

3.2 SYSTEMIC FEATURES

Cardiovascular
Feature Mechanism
Sinus tachycardia
HR > 140-160 bpm common
Atrial fibrillation
Up to 30-40%
High-output heart failure
↑ Cardiac demand
Widened pulse pressure
↑ Systolic, ↓ Diastolic
Hypotension / Shock
Late; Decompensation
Angina
↑ Myocardial oxygen demand
Cardiac arrest
Terminal event
Central Nervous System
Feature Progression
Agitation / Restlessness
Early
Anxiety / Emotional lability
Early
Tremor
Fine tremor exaggerated
Delirium / Confusion
Moderate
Psychosis
May be prominent
Seizures
Severe
Coma
Late; Poor prognosis
Thermoregulation
Feature Notes
Hyperthermia
Temperature 38.5-41°C
Profuse sweating
Attempt to dissipate heat
Warm, flushed skin
Vasodilation
Gastrointestinal / Hepatic
Feature Notes
Nausea / Vomiting
Common
Diarrhea
May be severe; Contributes to dehydration
Abdominal pain
May mimic acute abdomen
Jaundice
Hepatic dysfunction; Poor prognosis
Hepatomegaly
Congestion
Other
Feature Notes
Dehydration
Sweating, Diarrhea, Vomiting, Fever
Weight loss
Pre-existing from thyrotoxicosis
Goiter
Usually present; May have bruit
Eye signs
If Gravesโ€™ disease

3.3 SYMPTOMS AND SIGNS COMPARISON

Feature Thyrotoxicosis Thyroid Storm
Temperature Normal/Slight ↑
> 38.5°C, often > 40°C
Heart rate 100-120
> 140-160
Mental status Normal/Anxious
Altered (Delirium → Coma)
Cardiac Palpitations
AF, Heart failure, Shock
GI ↑ Motility
Diarrhea, Vomiting, Jaundice
Sweating Increased
Profuse
Precipitant May/May not
Almost always present

SECTION 4: DIAGNOSIS


4.1 CLINICAL DIAGNOSIS

๐Ÿšจ Thyroid storm is a CLINICAL diagnosis
Do NOT wait for biochemical confirmation to initiate treatment
Diagnostic Approach
SUSPECTED THYROID STORM
โ”‚
โ–ผ
CLINICAL ASSESSMENT
โ€ข Known/Suspected hyperthyroidism
โ€ข Fever > 38.5°C
โ€ข Tachycardia > 140
โ€ข Altered mental status
โ€ข Precipitant present
โ”‚
โ–ผ
CALCULATE BURCH-WARTOFSKY SCORE
โ”‚
โ–ผ
SCORE ≥ 45 = HIGHLY SUGGESTIVE
โ”‚
โ–ผ
INITIATE TREATMENT IMMEDIATELY
โ”‚
โ–ผ
SEND LABS (TFTs, etc.)
BUT DO NOT DELAY TREATMENT

4.2 BURCH-WARTOFSKY POINT SCALE (BWPS)

Scoring System
Parameter Criteria Points
TEMPERATURE
37.2-37.7°C (99-99.9°F) 5
37.8-38.2°C (100-100.9°F) 10
38.3-38.8°C (101-101.9°F) 15
38.9-39.4°C (102-102.9°F) 20
39.4-39.9°C (103-103.9°F) 25
≥ 40°C (≥ 104°F)
30
HEART RATE
100-109 bpm 5
110-119 bpm 10
120-129 bpm 15
130-139 bpm 20
≥ 140 bpm
25
ATRIAL FIBRILLATION
Absent 0
Present
10
CONGESTIVE HEART FAILURE
Absent 0
Mild (pedal edema) 5
Moderate (bibasal crackles) 10
Severe (pulmonary edema)
15
GI-HEPATIC DYSFUNCTION
Absent 0
Moderate (diarrhea, nausea, vomiting, abdominal pain) 10
Severe (unexplained jaundice)
20
CNS DISTURBANCE
Absent 0
Mild (agitation) 10
Moderate (delirium, psychosis, extreme lethargy) 20
Severe (seizure, coma)
30
PRECIPITATING EVENT
Absent 0
Present
10
Interpretation
Total Score Interpretation Action
≥ 45
Highly suggestive of thyroid storm
๐Ÿšจ Treat immediately
25-44
Impending storm / Probable
Treat aggressively; Close monitoring
< 25
Storm unlikely
Evaluate for other causes
Score Calculation Example
Parameter Finding Points
Temperature 39.5°C 25
Heart Rate 145 bpm 25
AF Present 10
CHF Moderate 10
GI Diarrhea, Nausea 10
CNS Delirium 20
Precipitant Pneumonia 10
TOTAL
110
Score 110 = Thyroid Storm โ€“ Initiate treatment immediately

4.3 JAPANESE THYROID ASSOCIATION (JTA) CRITERIA

Alternative Diagnostic Criteria
Prerequisites
Must Have
Thyrotoxicosis (elevated FT3 and/or FT4)
First Combination (TS1)
Criteria Required
CNS manifestation โœ…
PLUS Fever ≥ 38°C โœ…
PLUS ONE of:
โ€ข Tachycardia ≥ 130 OR
โ€ข CHF (NYHA IV or Killip III) OR
โ€ข GI/Hepatic (Nausea/Vomiting/Diarrhea, Bilirubin ≥ 3 mg/dL)
Second Combination (TS2)
Criteria Required
At least 3 of the following: โœ…
โ€ข Fever ≥ 38°C
โ€ข Tachycardia ≥ 130
โ€ข CHF (NYHA IV or Killip III)
โ€ข GI/Hepatic manifestations
JTA Grade
Grade Definition
TS1
Definite thyroid storm
TS2
Probable thyroid storm

4.4 LABORATORY INVESTIGATIONS

Urgent / Immediate
Test Expected Finding Notes
TSH
Suppressed (< 0.1) Confirms thyrotoxicosis
FT4
Elevated May not be markedly elevated
FT3
Elevated May be more elevated than FT4
CBC
Leukocytosis or Normal Infection; Stress response
LFTs
Often elevated Hepatic dysfunction; Monitor
Renal function
May be elevated Dehydration; Hypoperfusion
Glucose
Variable May be high (stress) or low
Electrolytes
Variable Hyponatremia; Hypokalemia
Calcium
May be elevated ↑ Bone turnover
Cortisol
Should be elevated If low โ€“ adrenal insufficiency
Lactate
May be elevated Hypoperfusion
ABG
Variable Metabolic acidosis (severe)
Coagulation
May be deranged DIC in severe cases
Additional Investigations
Test Purpose
ECG
AF, Sinus tachycardia, Ischemia
Chest X-ray
Pulmonary edema; Infection
Blood cultures
Suspected sepsis
Urine analysis / Culture
UTI
Cardiac enzymes
If cardiac ischemia suspected
Lumbar puncture
If meningitis suspected
CT scan
If stroke/other pathology suspected

4.5 IMPORTANT NOTES ON LABS

Point
๐Ÿ“Œ Biochemical severity does NOT correlate with clinical severity
T4/T3 levels in storm may be similar to uncomplicated thyrotoxicosis
Storm is defined by clinical decompensation, not hormone levels
Do NOT delay treatment waiting for labs
TSH is most reliable (should be suppressed)
FT4/FT3 confirm thyrotoxicosis

4.6 DIFFERENTIAL DIAGNOSIS

Condition Distinguishing Features
Sepsis / Septic shock
May coexist; Source of infection; Procalcitonin
Malignant hyperthermia
Post-anesthesia; Muscle rigidity
Neuroleptic malignant syndrome
Neuroleptic use; Rigidity; ↑ CK
Serotonin syndrome
Serotonergic drug use; Clonus; Hyperreflexia
Anticholinergic toxicity
Dry, flushed skin; Mydriasis; Urinary retention
Drug withdrawal
Alcohol, Benzodiazepine
Heat stroke
Environmental exposure; Dry skin
Pheochromocytoma crisis
Paroxysmal; ↑↑ BP; ↑ Catecholamines
Acute psychosis
Primary psychiatric; Normal TFTs
Meningitis / Encephalitis
Meningism; CSF abnormal

SECTION 5: MANAGEMENT โ€“ OVERVIEW


5.1 PRINCIPLES OF MANAGEMENT

Principle Goal
๐Ÿšจ ICU admission
Intensive monitoring and support
Block thyroid hormone synthesis
Prevent new hormone production
Block thyroid hormone release
Prevent release of stored hormone
Block peripheral T4→T3 conversion
Reduce active hormone
Block peripheral effects
Beta-blockade
Supportive care
Fluids, Cooling, Glucose, Oxygen
Treat relative adrenal insufficiency
Glucocorticoids
Identify and treat precipitant
Infection, etc.
Definitive therapy planning
After stabilization

5.2 TREATMENT ALGORITHM โ€“ OVERVIEW

๐Ÿšจ THYROID STORM โ€“ EMERGENCY MANAGEMENT
โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•โ•
STEP 1: ICU ADMISSION & SUPPORTIVE CARE
STEP 2: BLOCK SYNTHESIS (ATD)
STEP 3: BLOCK RELEASE (IODINE) โ€“ 1 HOUR AFTER ATD
STEP 4: BLOCK PERIPHERAL EFFECTS (BETA-BLOCKER)
STEP 5: BLOCK CONVERSION (GLUCOCORTICOIDS)
STEP 6: TREAT PRECIPITANT
STEP 7: ADJUNCTIVE THERAPIES (IF REFRACTORY)
STEP 8: DEFINITIVE THERAPY PLANNING

SECTION 6: MANAGEMENT โ€“ DETAILED


6.1 STEP 1: ICU ADMISSION AND SUPPORTIVE CARE

ICU Admission
Requirement Rationale
๐Ÿšจ Mandatory ICU/HDU admission
High mortality; Need for intensive monitoring
Continuous cardiac monitoring Arrhythmias; Hemodynamic instability
Frequent vital signs Every 15-30 minutes initially
Arterial line If hemodynamically unstable
Central venous access Fluid resuscitation; Vasopressors if needed
Urinary catheter Fluid balance monitoring
Airway and Breathing
Action Notes
Supplemental oxygen Maintain SpO2 > 94%
Airway protection If altered consciousness; Aspiration risk
Intubation If respiratory failure; Severe altered consciousness
Mechanical ventilation As needed
Fluid Resuscitation
Action Details
IV access
Large bore; Multiple lines if needed
Aggressive IV fluids
NS or RL; Correct dehydration
Volume deficit
Often 3-5 liters
Dextrose
Add D5 if hypoglycemic; High glucose demand
Monitor
Urine output; CVP if available
โš ๏ธ Caution in heart failure โ€“ Balance fluid resuscitation with cardiac status
Temperature Control (Cooling)
Action Details
Active cooling
Cooling blankets; Ice packs (axilla, groin)
Antipyretics
๐Ÿ’Š Paracetamol 1 g IV/PO q6h
โŒ Avoid Aspirin
Displaces T4 from TBG → ↑ Free T4
Tepid sponging
Adjunct
Cool IV fluids
May help
Glucose Management
Action Notes
Monitor glucose Frequently
Dextrose infusion High metabolic demand; Risk of hypoglycemia
Avoid hyperglycemia Stress response may cause hyperglycemia initially
Electrolyte Correction
Abnormality Action
Hypokalemia Replace potassium
Hyponatremia Usually dilutional; Fluid restriction if euvolemic
Hypocalcemia Replace if symptomatic

6.2 STEP 2: BLOCK THYROID HORMONE SYNTHESIS (ATD)

Drug Choice
Drug Preference
๐Ÿ’Š PTU (Propylthiouracil)
โœ… Preferred
๐Ÿ’Š Methimazole / Carbimazole
Alternative
Why PTU is Preferred in Thyroid Storm
Reason
Blocks peripheral T4 to T3 conversion (additional benefit)
Faster onset of action
Blocks synthesis + conversion
PTU Dosing
Phase Dose Route
Loading dose
500-1000 mg
PO/NG
Maintenance
200-250 mg every 4 hours
PO/NG
Total daily dose
1000-1500 mg/day
Methimazole / Carbimazole (Alternative)
Phase Dose Route
Loading dose
60-80 mg (MMI) or 80-100 mg (Carbimazole)
PO/NG
Maintenance
20-30 mg every 6-8 hours
PO/NG
Administration
Route Notes
Oral
If patient can swallow
Nasogastric tube
If unable to swallow
Rectal
PTU can be given rectally (enema) if no other route
โŒ No IV formulation
ATDs only available PO
India Availability
Drug Availability
Carbimazole
Widely available (Neomercazole 5mg, 10mg, 20mg)
PTU
Available (50mg tablets)
Methimazole
Available

6.3 STEP 3: BLOCK THYROID HORMONE RELEASE (IODINE)

Timing
๐Ÿšจ CRITICAL: Give iodine at least 1 HOUR AFTER ATD
Rationale
Why Wait 1 Hour?
Iodine can initially ↑ thyroid hormone synthesis (Jod-Basedow)
ATD must block synthesis FIRST
Then iodine blocks RELEASE of preformed hormone (Wolff-Chaikoff effect)
Giving iodine first can WORSEN thyroid storm
Iodine Options
Drug Dose Frequency Route
๐Ÿ’Š Lugolโ€™s Iodine (Strong Iodine Solution)
4-8 drops
Every 6-8 hours PO/NG
๐Ÿ’Š SSKI (Saturated Solution of Potassium Iodide)
5 drops
Every 6 hours PO/NG
๐Ÿ’Š Sodium Iodide
500 mg-1 g
Every 8-12 hours IV
๐Ÿ’Š Potassium Iodide tablets
60 mg
Every 6-8 hours PO
๐Ÿ’Š Ipodate/Iopanoic acid
500 mg
Every 12 hours PO
Lugolโ€™s Iodine
Composition
5% Iodine + 10% Potassium Iodide
~8 mg iodine per drop
Dilute in water or juice (bitter taste)
SSKI
Composition
Saturated Potassium Iodide
~50 mg iodine per drop
Fewer drops needed
If Iodine Allergic
Alternative Dose
๐Ÿ’Š Lithium Carbonate
300 mg every 8 hours PO
Lithium
Notes
Blocks thyroid hormone release
Alternative to iodine in allergic patients
Monitor lithium levels (target 0.6-1.0 mEq/L)
Risk of toxicity
India Availability
Drug Availability
Lugolโ€™s Iodine
Available; Pharmacies
SSKI
Available
Sodium Iodide IV
May be limited
Lithium
Available

6.4 STEP 4: BLOCK PERIPHERAL EFFECTS (BETA-BLOCKERS)

Role
Effect
Control tachycardia
Reduce tremor
Reduce agitation
↓ Peripheral T4 to T3 conversion (Propranolol)
↓ Catecholamine effects
Drug Choice
Drug Dose Route Notes
๐Ÿ’Š Propranolol
60-80 mg
Every 4-6 hours PO โœ… Preferred (blocks T4→T3)
๐Ÿ’Š Propranolol IV
0.5-1 mg
Every 5-10 min; Max 10 mg Severe/Unable to take PO
๐Ÿ’Š Esmolol
50-100 μg/kg/min
IV infusion Titratable; Short-acting
๐Ÿ’Š Metoprolol
5 mg
IV every 5 min; Max 15 mg Alternative
๐Ÿ’Š Atenolol
50-100 mg
PO daily Less preferred (no T4→T3 block)
Propranolol โ€“ Preferred
Advantage
Non-selective beta-blocker
Blocks peripheral T4 to T3 conversion
Controls tachycardia and tremor
Anxiolytic effect
Esmolol โ€“ When to Use
Indication
Severe tachycardia with hemodynamic instability
Need for rapid titration
Uncertain cardiac function
Short half-life (can be stopped quickly if problems)
Dosing in Severe Cases
Propranolol Dose
IV loading
0.5-1 mg slow IV every 5-10 min until HR controlled
Maintenance
Oral 60-80 mg every 4-6 hours
May need higher doses
Up to 120 mg every 6 hours
Contraindications / Caution
Contraindication Alternative
โŒ Severe bronchospasm / Asthma
Diltiazem or Verapamil
โš ๏ธ Decompensated heart failure
Use with extreme caution; Esmolol preferred
โš ๏ธ Hypotension
Cautious use; May need vasopressors
If Beta-Blocker Contraindicated
Alternative Dose
๐Ÿ’Š Diltiazem
60-90 mg PO q6h; or 0.25 mg/kg IV bolus then 5-15 mg/hr
๐Ÿ’Š Verapamil
40-80 mg PO TID

6.5 STEP 5: BLOCK PERIPHERAL CONVERSION + ADRENAL SUPPORT (GLUCOCORTICOIDS)

Role
Effect
↓ Peripheral T4 to T3 conversion
Treat relative adrenal insufficiency
Anti-inflammatory
Possible direct thyroid effect
Rationale for Glucocorticoids
Point
Thyroid hormone ↑ cortisol metabolism
Severe thyrotoxicosis depletes adrenal reserve
Relative adrenal insufficiency is common
Glucocorticoids improve outcomes
Drug Options
Drug Dose Route Frequency
๐Ÿ’Š Hydrocortisone
100 mg
IV Every 8 hours
๐Ÿ’Š Dexamethasone
2 mg
IV Every 6 hours
๐Ÿ’Š Methylprednisolone
60-80 mg
IV Every 8-12 hours
Preference
Drug Notes
Hydrocortisone
โœ… Preferred; Mineralocorticoid activity; Stress dose
Dexamethasone
More potent T4→T3 inhibition; No mineralocorticoid
Duration
Phase Duration
Acute
Continue until clinically stable
Taper
Over days as patient improves
Discontinue
Once stable; Adrenal function recovers

6.6 STEP 6: TREAT THE PRECIPITANT

Identify and Treat
Precipitant Action
Infection
Empiric broad-spectrum antibiotics; Cultures; Source control
Surgery
Supportive; Was patient prepared?
MI
Cardiology; Careful with beta-blockers in acute setting
DKA
Standard DKA protocol
Stroke
Neurology; Supportive
Trauma
Trauma management
Drug-related
Discontinue offending agent if possible
Infection โ€“ Most Common
Action
Blood cultures before antibiotics
Chest X-ray
Urine analysis and culture
Empiric antibiotics (Broad-spectrum)
Adjust based on culture results

6.7 STEP 7: ADJUNCTIVE THERAPIES (REFRACTORY CASES)

Cholestyramine
Drug
๐Ÿ’Š Cholestyramine
Dose
4 g every 6 hours PO
Mechanism
Binds thyroid hormone in gut; ↓ Enterohepatic circulation
Use
Adjunct in refractory cases
Plasmapheresis / Plasma Exchange
Indication
Refractory thyroid storm
Rapidly deteriorating despite medical therapy
Pre-operative preparation for emergency thyroidectomy
Mechanism
Removes circulating thyroid hormones
Removes TRAb
Temporary effect
Availability
Major centers
๐Ÿ‡ฎ๐Ÿ‡ณ Available in tertiary hospitals in India
Emergency Thyroidectomy
Indication
Refractory to all medical therapy
Patient continues to deteriorate
Pre-operative optimization critical
Notes
Very high-risk surgery
Should be performed by experienced thyroid surgeon
Requires maximal medical optimization first
Mortality high but may be life-saving

SECTION 7: TREATMENT SUMMARY TABLE


7.1 TREATMENT AT A GLANCE

Step Agent Dose Route Timing
1
Supportive Care
ICU; Fluids; Cooling; O2 Immediate
2
๐Ÿ’Š PTU
500-1000 mg load, then 200-250 mg q4h PO/NG Immediate
OR ๐Ÿ’Š Methimazole
60-80 mg load, then 20-30 mg q6-8h PO/NG
3
๐Ÿ’Š Lugolโ€™s Iodine
4-8 drops q6-8h PO/NG
1 hour AFTER ATD
OR ๐Ÿ’Š SSKI
5 drops q6h PO/NG
OR ๐Ÿ’Š Lithium (if iodine allergic)
300 mg q8h PO
4
๐Ÿ’Š Propranolol
60-80 mg q4-6h PO; or 0.5-1 mg IV q5-10min PO/IV Immediate
OR ๐Ÿ’Š Esmolol
50-100 μg/kg/min IV infusion
5
๐Ÿ’Š Hydrocortisone
100 mg q8h IV Immediate
OR ๐Ÿ’Š Dexamethasone
2 mg q6h IV
6
Treat Precipitant
Antibiotics; etc. Immediate
7
๐Ÿ’Š Cholestyramine (adjunct)
4 g q6h PO If refractory
Plasmapheresis
If refractory
8
๐Ÿ’Š Paracetamol
1 g q6h PO/IV For fever
โŒ Avoid Aspirin

7.2 ORDER OF ADMINISTRATION

TIME 0: ICU Admission + Supportive Care
โ”‚
โ”œโ”€โ”€ IV fluids
โ”œโ”€โ”€ Oxygen
โ”œโ”€โ”€ Cooling (Paracetamol, NOT Aspirin)
โ”œโ”€โ”€ Cardiac monitoring
โ”‚
โ–ผ
TIME 0: ๐Ÿ’Š PTU 500-1000 mg (or MMI 60-80 mg)
๐Ÿ’Š Propranolol 60-80 mg (or IV if severe)
๐Ÿ’Š Hydrocortisone 100 mg IV
โ”‚
โ–ผ
TIME +1 HR: ๐Ÿ’Š Lugol's Iodine 4-8 drops (or SSKI 5 drops)
โ”‚
โ–ผ
TIME +4 HR: ๐Ÿ’Š PTU 200-250 mg (repeat q4h)
โ”‚
โ–ผ
ONGOING: Continue all medications as scheduled
Monitor and adjust
Treat precipitant

SECTION 8: MONITORING


8.1 CLINICAL MONITORING

Parameter Frequency Target/Notes
Heart rate
Continuous Target < 100 bpm
Blood pressure
Every 15-30 min initially Avoid hypotension
Temperature
Every 1-2 hours Target < 38°C
Respiratory rate
Continuous Watch for respiratory failure
SpO2
Continuous > 94%
Mental status
Hourly Improvement expected
Urine output
Hourly > 0.5 mL/kg/hr
Cardiac rhythm
Continuous Watch for AF, Arrhythmias

8.2 LABORATORY MONITORING

Test Frequency Notes
FT4, FT3, TSH
Every 24-48 hours initially Monitor response
CBC
Daily Agranulocytosis risk with ATD
LFTs
Daily Hepatic dysfunction; ATD toxicity
Renal function
Daily Hypoperfusion
Electrolytes
Every 6-12 hours initially Correct abnormalities
Glucose
Every 4-6 hours Hypo/Hyperglycemia
Lactate
As needed Tissue perfusion
ABG
As needed Acid-base status
Cortisol
If adrenal insufficiency suspected

8.3 RESPONSE TO TREATMENT

Expected Timeline
Timeframe Expected Response
Hours
↓ Heart rate; ↓ Temperature; ↓ Agitation
24-48 hours
Clinical improvement; ↓ FT4/FT3 begins
3-5 days
Significant clinical improvement
1-2 weeks
Near euthyroid; Stable
Signs of Improvement
Parameter Expected Change
Temperature Normalizing
Heart rate < 100 bpm
Mental status Improving
Cardiac function Stabilizing
FT4/FT3 Decreasing
Signs of Deterioration
๐Ÿšจ Warning Signs
Persistent hyperthermia
Worsening altered consciousness
Refractory tachycardia
Cardiovascular collapse
Multi-organ failure
Worsening jaundice

SECTION 9: COMPLICATIONS


9.1 COMPLICATIONS OF THYROID STORM

Complication Management
Cardiovascular collapse / Shock
Vasopressors; Inotropes; Fluid resuscitation
Atrial fibrillation
Rate control (Beta-blockers); Anticoagulation
Heart failure
Diuretics; Inotropes; Cautious beta-blockers
Respiratory failure
Intubation; Mechanical ventilation
Multi-organ failure
ICU supportive care
DIC
Supportive; Blood products
Seizures
Benzodiazepines; Phenytoin
Rhabdomyolysis
IV fluids; Monitor CK
Coma
Supportive; Airway protection
Death
Despite treatment in 10-30%

9.2 COMPLICATIONS OF TREATMENT

Complication Cause Management
Agranulocytosis
ATD (PTU/MMI) Stop ATD; G-CSF; Antibiotics
Hepatotoxicity
ATD (especially PTU) Stop ATD; Supportive
Hypotension
Beta-blockers Reduce dose; Vasopressors
Bradycardia
Beta-blockers Reduce dose; Atropine if severe
Bronchospasm
Beta-blockers Stop; Use CCB alternative
Heart failure worsening
Beta-blockers Careful titration; Esmolol
Iodine allergy
Lugolโ€™s/SSKI Use Lithium instead

SECTION 10: SPECIAL SITUATIONS


10.1 THYROID STORM IN PREGNANCY

Challenges
Challenge
Diagnosis may be difficult (pregnancy changes TFTs)
Fetal considerations
Drug safety
Higher morbidity and mortality
Treatment Modifications
Agent Recommendation
PTU
โœ… Preferred ATD in pregnancy (especially 1st trimester)
Methimazole
Avoid in 1st trimester (teratogenic)
Propranolol
Use with caution; Monitor fetus
Iodine
Can be used
Glucocorticoids
Can be used
Cooling
Avoid hyperthermia (fetal risk)
Delivery
Consideration
May need emergency delivery if mother unstable
Neonatal thyrotoxicosis possible
Multidisciplinary team (Endocrine, OB, Neonatal)

10.2 THYROID STORM POST-RAI

Features
Point
Rare complication of RAI therapy
Usually within 1-2 weeks of RAI
Due to release of stored hormone from damaged thyroid
More common in inadequately prepared patients
Prevention
Measure
Pre-treat with ATD (especially if severe thyrotoxicosis)
Avoid RAI in severe uncontrolled disease
Ensure adequate preparation

10.3 THYROID STORM WITH ATRIAL FIBRILLATION

Management
Issue Management
Rate control
Beta-blockers (Propranolol, Esmolol); Digoxin less effective in thyrotoxicosis
Anticoagulation
↑ Stroke risk; Consider anticoagulation
Cardioversion
Often reverts spontaneously once euthyroid; May need if hemodynamically unstable
Warfarin sensitivity
Thyrotoxic patients metabolize vitamin K factors faster; Lower warfarin dose needed

10.4 THYROID STORM WITH HEART FAILURE

Challenge
Point
Beta-blockers can worsen heart failure
Heart failure is from hyperthyroidism itself
Treating thyrotoxicosis improves heart failure
Management
Approach
Esmolol โ€“ Short-acting; Can be stopped quickly
Start with very low doses
Titrate carefully
Inotropic support if needed
Diuretics for pulmonary edema
Digoxin less effective (increased clearance)

10.5 AMIODARONE-INDUCED THYROID STORM

Challenges
Point
May be AIT-1 (excess iodine) or AIT-2 (thyroiditis) or Mixed
Amiodarone has very long half-life (weeks-months)
Stopping amiodarone may not be feasible (cardiac indication)
Treatment
Type Treatment
AIT-1
ATD (high dose) + Potassium perchlorate
AIT-2
Glucocorticoids
Mixed/Unknown
Combined ATD + Glucocorticoids
Refractory
Emergency thyroidectomy; Plasmapheresis
Potassium Perchlorate
Drug
๐Ÿ’Š Potassium Perchlorate
Dose
250 mg every 6 hours (1 g/day)
Duration
2-4 weeks maximum
Mechanism
Blocks iodine uptake into thyroid
Availability
Limited; May need to compound ๐Ÿ‡ฎ๐Ÿ‡ณ

SECTION 11: DEFINITIVE THERAPY AFTER STABILIZATION


11.1 TIMING

Point
Definitive therapy after patient stabilized
Continue ATD until decision made
Discuss options with patient
Consider cause (Gravesโ€™ vs Nodular disease)

11.2 OPTIONS

Option Notes
Continue ATD
12-18 months for Gravesโ€™ (remission possible); Indefinite for nodular disease
Radioactive Iodine (RAI)
Definitive; After stabilization; Pre-treat with ATD
Surgery (Thyroidectomy)
Definitive; After stabilization; Pre-operative preparation essential

11.3 RECOMMENDATIONS

Cause Preferred Definitive Therapy
Gravesโ€™ disease
RAI or Surgery (avoid recurrence of storm)
Toxic MNG
Surgery or RAI
Toxic adenoma
Surgery or RAI
AIT
Thyroidectomy if refractory/recurrent

SECTION 12: PREVENTION


12.1 PREVENTION STRATEGIES

Primary Prevention
Strategy
Early diagnosis and treatment of hyperthyroidism
Patient education on compliance
Regular follow-up
Avoid RAI in severe uncontrolled disease without preparation
Pre-Operative Preparation
Before Thyroid Surgery
Achieve euthyroid state with ATD
Add Lugolโ€™s iodine for 7-10 days pre-op
Beta-blocker for heart rate control
Do NOT operate on unprepared thyrotoxic patient
Before RAI
Preparation
Pre-treat severe cases with ATD
Ensure not profoundly thyrotoxic
Stop ATD 3-7 days before RAI
Resume ATD if persistent hyperthyroidism post-RAI
Patient Education
Educate Patient On
Importance of medication compliance
Warning signs of worsening
When to seek medical attention
Avoiding precipitants

SECTION 13: INDIA-SPECIFIC CONSIDERATIONS


13.1 EPIDEMIOLOGY IN INDIA

Point
Gravesโ€™ disease most common cause
Delayed presentation common
Infection most common precipitant
TB and tropical infections may trigger
Non-compliance due to cost/access

13.3 HEALTHCARE SETTING CONSIDERATIONS

Tertiary/Teaching Hospital
Resource Availability
ICU โœ…
Endocrinology โœ…
Thyroid surgery โœ…
Plasmapheresis โœ…
RAI โœ…
District Hospital
Resource Availability
ICU Variable
Endocrinology May need referral
Thyroid surgery May need referral
Plasmapheresis โŒ
Basic drugs โœ…
Primary Health Center
Action
Recognize thyroid storm
Initiate supportive care
Start available medications
REFER IMMEDIATELY to higher center

13.4 PRACTICAL TIPS FOR INDIAN SETTING

Tip
Lugolโ€™s iodine widely available โ€“ use it
Carbimazole can be used if PTU unavailable (higher doses)
Propranolol effective and affordable
Hydrocortisone available in most hospitals
Donโ€™t delay treatment โ€“ Start whatโ€™s available
Refer early to tertiary center if not responding
Screen for TB as precipitant
Empiric antibiotics for suspected infection

SECTION 14: SUMMARY TABLES


14.1 BURCH-WARTOFSKY SCORE โ€“ QUICK REFERENCE

Parameter Score Range
Temperature 5-30
Heart rate 5-25
Atrial fibrillation 0-10
Heart failure 0-15
GI-Hepatic 0-20
CNS 0-30
Precipitant 0-10
TOTAL
0-140
Score Interpretation
≥ 45 Thyroid storm
25-44 Impending storm
< 25 Storm unlikely

14.2 DRUG DOSES โ€“ QUICK REFERENCE

Drug Dose
PTU
500-1000 mg load → 200-250 mg q4h
Methimazole
60-80 mg load → 20-30 mg q6-8h
Lugolโ€™s Iodine
4-8 drops q6-8h (1 hr AFTER ATD)
SSKI
5 drops q6h
Propranolol PO
60-80 mg q4-6h
Propranolol IV
0.5-1 mg q5-10min (max 10 mg)
Esmolol
50-100 μg/kg/min
Hydrocortisone
100 mg IV q8h
Dexamethasone
2 mg IV q6h
Cholestyramine
4 g q6h
Lithium
300 mg q8h (if iodine allergic)
Paracetamol
1 g q6h (for fever)

14.3 TREATMENT SEQUENCE

Step Time Action
1 0 ICU; IV fluids; Cooling; O2; Monitoring
2 0 PTU 500-1000 mg (or MMI 60-80 mg)
3 0 Propranolol 60-80 mg PO (or IV if severe)
4 0 Hydrocortisone 100 mg IV
5 0 Identify and treat precipitant
6 +1 hr Lugolโ€™s iodine 4-8 drops
7 +4 hr PTU 200-250 mg (continue q4h)
8 Ongoing Monitor; Adjust; Supportive care

14.4 MONITORING CHECKLIST

Parameter Frequency
Heart rate Continuous
Blood pressure q15-30min
Temperature q1-2h
SpO2 Continuous
Mental status q1h
Urine output q1h
TFTs q24-48h
CBC, LFTs, Renal Daily
Electrolytes, Glucose q6-12h

14.5 CONTRAINDICATIONS SUMMARY

โŒ AVOID
Aspirin โ€“ Displaces T4 from TBG
Iodine BEFORE ATD โ€“ Worsens thyrotoxicosis
Beta-blockers in severe asthma โ€“ Bronchospasm
Aggressive beta-blockade in decompensated HF โ€“ Cardiogenic shock
Delay in treatment โ€“ Increased mortality

14.6 WHEN TO ESCALATE

๐Ÿšจ Escalate If
No improvement in 24-48 hours
Worsening vital signs
Deteriorating mental status
Developing multi-organ failure
Refractory hyperthermia
Consider: Plasmapheresis, Emergency thyroidectomy

๐Ÿ“š ABBREVIATIONS

Abbreviation Full Form
ABG Arterial Blood Gas
AF Atrial Fibrillation
AIT Amiodarone-Induced Thyrotoxicosis
ATD Antithyroid Drug
BWPS Burch-Wartofsky Point Scale
CBC Complete Blood Count
CHF Congestive Heart Failure
CK Creatine Kinase
CNS Central Nervous System
CVP Central Venous Pressure
DIC Disseminated Intravascular Coagulation
DKA Diabetic Ketoacidosis
FT3 Free Triiodothyronine
FT4 Free Thyroxine
G-CSF Granulocyte Colony-Stimulating Factor
GI Gastrointestinal
HDU High Dependency Unit
HR Heart Rate
ICU Intensive Care Unit
IV Intravenous
JTA Japanese Thyroid Association
LFT Liver Function Tests
MI Myocardial Infarction
MMI Methimazole
MNG Multinodular Goiter
NG Nasogastric
NS Normal Saline
NYHA New York Heart Association
PO Per Oral
PTU Propylthiouracil
RAI Radioactive Iodine
RL Ringerโ€™s Lactate
SSKI Saturated Solution of Potassium Iodide
T3 Triiodothyronine
T4 Thyroxine
TB Tuberculosis
TBG Thyroxine-Binding Globulin
TFT Thyroid Function Tests
TRAb TSH Receptor Antibodies
TSH Thyroid-Stimulating Hormone
UTI Urinary Tract Infection

๐Ÿ“– REFERENCES

Source Year
Burch HB, Wartofsky L. Life-threatening thyrotoxicosis. Endocrinol Metab Clin North Am 1993
Akamizu T et al. Diagnostic criteria for thyroid storm. Thyroid 2012
Ross DS et al. ATA Guidelines for Hyperthyroidism. Thyroid 2016
Chiha M et al. Thyroid storm: An updated review. J Intensive Care Med 2015
Angell TE et al. Thyroid Storm. Endotext 2022
Swee du S et al. Clinical review: Thyroid storm. Crit Care 2015
Harrisonโ€™s Principles of Internal Medicine 21st Edition
Williams Textbook of Endocrinology 14th Edition
Indian Thyroid Society Guidelines Various

Document Version: 1.0
Last Updated: December 2025
For: Healthcare Professionals Only โ€“ Emergency Medicine, Critical Care, Endocrinology
๐Ÿšจ EMERGENCY DOCUMENT โ€“ Quick reference for life-threatening condition
Disclaimer: Clinical judgment must be exercised for individual patients. This guideline is for educational purposes. Local protocols should be followed. Mortality is 10-30% even with optimal treatment โ€“ Early recognition and aggressive management are critical.

End of Guideline
๐Ÿ›ก๏ธ

Medical Advisory

Clinical guidelines are subject to change. Physicians should exercise their regular clinical judgment. This protocol does not replace individual institutional policies. Verified for Q1 2026.

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