Thyrotoxicosis

Verified clinical guidelines and emergency management protocols.

Protocol Content

THYROID STORM – INDIA

EMERGENCY MANAGEMENT GUIDELINE

📋 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.

🔰 SYMBOL LEGEND

Symbol	Meaning
✅	Recommended / First-line
⚠️	Caution / Monitor
❌	Contraindicated / Avoid
💊	Drug name
🇮🇳	India-specific consideration
📌	Key point
➡️	Next step
🚨	Emergency / Critical

SECTION 1: OVERVIEW

1.1 DEFINITION

🚨 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 – 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)

│

▼

PRECIPITATING EVENT

(Infection, Surgery, Trauma, etc.)

│

▼

┌───────────┴───────────┐

│ │

▼ ▼

↑↑ Catecholamine ↑↑ Thyroid Hormone

Sensitivity Action/Release

│ │

└───────────┬───────────┘

│

▼

MULTI-ORGAN FAILURE

• Cardiovascular collapse

• CNS dysfunction

• Hyperthermia

• GI/Hepatic failure

│

▼

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
Graves’ 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

📌 Almost always an identifiable precipitant – Search for it!

Common Precipitants

Category	Precipitant
Infection 🚨	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
🚨 Hyperthermia	Temperature > 38.5°C, often > 40°C
🚨 Tachycardia	Out of proportion; HR > 140 bpm; Atrial fibrillation
🚨 Altered mental status	Agitation → Delirium → Psychosis → Coma
🚨 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 Graves’ 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

🚨 Thyroid storm is a CLINICAL diagnosis

Do NOT wait for biochemical confirmation to initiate treatment

Diagnostic Approach

SUSPECTED THYROID STORM

│

▼

CLINICAL ASSESSMENT

• Known/Suspected hyperthyroidism

• Fever > 38.5°C

• Tachycardia > 140

• Altered mental status

• Precipitant present

│

▼

CALCULATE BURCH-WARTOFSKY SCORE

│

▼

SCORE ≥ 45 = HIGHLY SUGGESTIVE

│

▼

INITIATE TREATMENT IMMEDIATELY

│

▼

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	🚨 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 – 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	✅
PLUS Fever ≥ 38°C	✅
PLUS ONE of:
• Tachycardia ≥ 130	OR
• CHF (NYHA IV or Killip III)	OR
• GI/Hepatic (Nausea/Vomiting/Diarrhea, Bilirubin ≥ 3 mg/dL)

Second Combination (TS2)

Criteria	Required
At least 3 of the following:	✅
• Fever ≥ 38°C
• Tachycardia ≥ 130
• CHF (NYHA IV or Killip III)
• 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 – 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

📌 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 – OVERVIEW

5.1 PRINCIPLES OF MANAGEMENT

Principle	Goal
🚨 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 – OVERVIEW

🚨 THYROID STORM – EMERGENCY MANAGEMENT

═══════════════════════════════════════

STEP 1: ICU ADMISSION & SUPPORTIVE CARE

↓

STEP 2: BLOCK SYNTHESIS (ATD)

↓

STEP 3: BLOCK RELEASE (IODINE) – 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 – DETAILED

6.1 STEP 1: ICU ADMISSION AND SUPPORTIVE CARE

ICU Admission

Requirement	Rationale
🚨 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

⚠️ Caution in heart failure – Balance fluid resuscitation with cardiac status

Temperature Control (Cooling)

Action	Details
Active cooling	Cooling blankets; Ice packs (axilla, groin)
Antipyretics	💊 Paracetamol 1 g IV/PO q6h
❌ 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
💊 PTU (Propylthiouracil)	✅ Preferred
💊 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
❌ 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

🚨 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
💊 Lugol’s Iodine (Strong Iodine Solution)	4-8 drops	Every 6-8 hours	PO/NG
💊 SSKI (Saturated Solution of Potassium Iodide)	5 drops	Every 6 hours	PO/NG
💊 Sodium Iodide	500 mg-1 g	Every 8-12 hours	IV
💊 Potassium Iodide tablets	60 mg	Every 6-8 hours	PO
💊 Ipodate/Iopanoic acid	500 mg	Every 12 hours	PO

Lugol’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
💊 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
Lugol’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
💊 Propranolol	60-80 mg	Every 4-6 hours PO	✅ Preferred (blocks T4→T3)
💊 Propranolol IV	0.5-1 mg	Every 5-10 min; Max 10 mg	Severe/Unable to take PO
💊 Esmolol	50-100 μg/kg/min	IV infusion	Titratable; Short-acting
💊 Metoprolol	5 mg	IV every 5 min; Max 15 mg	Alternative
💊 Atenolol	50-100 mg	PO daily	Less preferred (no T4→T3 block)

Propranolol – Preferred

Advantage

Non-selective beta-blocker

Blocks peripheral T4 to T3 conversion

Controls tachycardia and tremor

Anxiolytic effect

Esmolol – 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
❌ Severe bronchospasm / Asthma	Diltiazem or Verapamil
⚠️ Decompensated heart failure	Use with extreme caution; Esmolol preferred
⚠️ Hypotension	Cautious use; May need vasopressors

If Beta-Blocker Contraindicated

Alternative	Dose
💊 Diltiazem	60-90 mg PO q6h; or 0.25 mg/kg IV bolus then 5-15 mg/hr
💊 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
💊 Hydrocortisone	100 mg	IV	Every 8 hours
💊 Dexamethasone	2 mg	IV	Every 6 hours
💊 Methylprednisolone	60-80 mg	IV	Every 8-12 hours

Preference

Drug	Notes
Hydrocortisone	✅ 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 – 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	💊 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

🇮🇳 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	💊 PTU	500-1000 mg load, then 200-250 mg q4h	PO/NG	Immediate
	OR 💊 Methimazole	60-80 mg load, then 20-30 mg q6-8h	PO/NG
3	💊 Lugol’s Iodine	4-8 drops q6-8h	PO/NG	1 hour AFTER ATD
	OR 💊 SSKI	5 drops q6h	PO/NG
	OR 💊 Lithium (if iodine allergic)	300 mg q8h	PO
4	💊 Propranolol	60-80 mg q4-6h PO; or 0.5-1 mg IV q5-10min	PO/IV	Immediate
	OR 💊 Esmolol	50-100 μg/kg/min	IV infusion
5	💊 Hydrocortisone	100 mg q8h	IV	Immediate
	OR 💊 Dexamethasone	2 mg q6h	IV
6	Treat Precipitant	Antibiotics; etc.		Immediate
7	💊 Cholestyramine (adjunct)	4 g q6h	PO	If refractory
	Plasmapheresis			If refractory
8	💊 Paracetamol	1 g q6h	PO/IV	For fever
	❌ Avoid Aspirin

7.2 ORDER OF ADMINISTRATION

TIME 0: ICU Admission + Supportive Care

│

├── IV fluids

├── Oxygen

├── Cooling (Paracetamol, NOT Aspirin)

├── Cardiac monitoring

│

▼

TIME 0: 💊 PTU 500-1000 mg (or MMI 60-80 mg)

💊 Propranolol 60-80 mg (or IV if severe)

💊 Hydrocortisone 100 mg IV

│

▼

TIME +1 HR: 💊 Lugol's Iodine 4-8 drops (or SSKI 5 drops)

│

▼

TIME +4 HR: 💊 PTU 200-250 mg (repeat q4h)

│

▼

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

🚨 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	Lugol’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	✅ 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 – 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	💊 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 🇮🇳

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 (Graves’ vs Nodular disease)

11.2 OPTIONS

Option	Notes
Continue ATD	12-18 months for Graves’ (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
Graves’ 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 Lugol’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

Graves’ 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	✅
Endocrinology	✅
Thyroid surgery	✅
Plasmapheresis	✅
RAI	✅

District Hospital

Resource	Availability
ICU	Variable
Endocrinology	May need referral
Thyroid surgery	May need referral
Plasmapheresis	❌
Basic drugs	✅

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

Lugol’s iodine widely available – use it

Carbimazole can be used if PTU unavailable (higher doses)

Propranolol effective and affordable

Hydrocortisone available in most hospitals

Don’t delay treatment – Start what’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 – 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 – QUICK REFERENCE

Drug	Dose
PTU	500-1000 mg load → 200-250 mg q4h
Methimazole	60-80 mg load → 20-30 mg q6-8h
Lugol’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	Lugol’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

❌ AVOID

Aspirin – Displaces T4 from TBG

Iodine BEFORE ATD – Worsens thyrotoxicosis

Beta-blockers in severe asthma – Bronchospasm

Aggressive beta-blockade in decompensated HF – Cardiogenic shock

Delay in treatment – Increased mortality

14.6 WHEN TO ESCALATE

🚨 Escalate If

No improvement in 24-48 hours

Worsening vital signs

Deteriorating mental status

Developing multi-organ failure

Refractory hyperthermia

Consider: Plasmapheresis, Emergency thyroidectomy

📚 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	Ringer’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

📖 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
Harrison’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 – Emergency Medicine, Critical Care, Endocrinology

🚨 EMERGENCY DOCUMENT – 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 – Early recognition and aggressive management are critical.

End of Guideline

🛡️

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.

Content Feedback

Is this information helpful?

Help us improve our clinical database for the medical community.

RxIndia

Loading clinical data...