Critical Emergencies to Know

Recognizing and managing anesthetic emergencies requires two simultaneous skills:

Rapid pattern recognition of life‑threatening physiologic changes, and

Immediate, protocol‑driven action using crisis resource management (CRM).

Anesthetic emergencies are recognized by sudden deviations in airway, breathing, circulation, temperature, or neuromuscular response, and managed using ABCDE, early help, and specific crisis algorithms (e.g., anaphylaxis, MH, local anesthetic toxicity, difficult airway).

🚨 1. How to Recognize Anesthetic Emergencies

Each bullet begins with a Guided Link so you can explore deeper.

A. Airway Emergencies

Clues:

Sudden ↑ airway pressure
↓ tidal volumes
Stridor, no ETCO₂, paradoxical chest movement
Desaturation

Likely diagnoses:
Laryngospasm, bronchospasm, esophageal intubation, obstruction, “can’t intubate, can’t ventilate”.

B. Breathing Emergencies

Clues:

Rapid desaturation
High peak pressures
Wheeze, silent chest
Absent breath sounds on one side

Likely diagnoses:
Bronchospasm, pneumothorax, circuit disconnection, ventilator failure.

C. Circulatory Collapse

Clues:

Sudden hypotension
Tachycardia or bradycardia
Collapse of ETCO₂
Arrhythmias

Likely diagnoses:
Anaphylaxis, hemorrhage, myocardial ischemia, high spinal, embolism.

D. Temperature & Metabolic Crises

Clues:

Rapid ↑ CO₂
Muscle rigidity
Hyperthermia
Acidosis

Likely diagnoses:
Malignant hyperthermia, thyroid storm, sepsis.

E. Neuromuscular Emergencies

Clues:

Inadequate paralysis
Prolonged paralysis
Masseter spasm

Likely diagnoses:
Pseudocholinesterase deficiency, sux‑induced issues, MH early signs.

🛠️ 2. Immediate Management: The Universal Framework

Every anesthetic emergency begins with ABCDE + call for help.

🅰️ Airway

Open airway
100% O₂
Confirm tube position
Suction, jaw thrust
Prepare for surgical airway if needed

🅱️ Breathing

Switch to manual ventilation
Check circuit, valves, oxygen supply
Treat bronchospasm (deep anesthesia, salbutamol, epinephrine)

🅲 Circulation

IV access
Fluids
Vasopressors
CPR if needed

🅳 Disability

Check pupils, glucose, anesthetic depth

🅴 Exposure

Look for rash, bleeding, temperature changes

🔥 3. Specific High‑Stakes Emergencies & Management

1. Anaphylaxis

Recognition:
Hypotension, bronchospasm, rash, ↑ airway pressures.
Management:

Stop trigger
Epinephrine 10–100 µg IV boluses
Fluids (large volumes)
Antihistamines, steroids
Prepare for airway edema

rcoa.ac.uk

2. Malignant Hyperthermia

Recognition:
Rapid ↑ CO₂, rigidity, tachycardia, hyperthermia.
Management:

Stop triggers (volatiles, sux)
Give dantrolene immediately
Active cooling
Treat hyperkalemia, acidosis
ICU transfer

rcoa.ac.uk

3. Local Anesthetic Systemic Toxicity (LAST)

Recognition:
Perioral numbness → seizures → arrhythmias → cardiac arrest.
Management:

Stop LA
Airway + seizure control
20% intralipid bolus + infusion
Avoid vasopressin, Ca‑channel blockers, beta‑blockers

rcoa.ac.uk

4. Difficult Airway / CICV

Recognition:
Cannot intubate, cannot ventilate.
Management:

Call for help
Supraglottic airway
100% O₂
If failure → front‑of‑neck access (cricothyrotomy)

rcoa.ac.uk

5. High Spinal Block

Recognition:
Hypotension, bradycardia, dyspnea, inability to speak, apnea.
Management:

Vasopressors
Fluids
Support ventilation
Reassure if awake

6. Air Embolism

Recognition:
Sudden ↓ ETCO₂, hypotension, mill‑wheel murmur.
Management:

Flood field
Durant position (left lateral + head down)
Aspirate via central line if present

📊 4. Quick Comparison Table

Emergency	Key Clue	Immediate Action	Definitive Treatment
Anaphylaxis	Sudden hypotension + bronchospasm	Epinephrine	Fluids, steroids
MH	Rapid ↑ CO₂ + rigidity	Stop triggers	Dantrolene
LAST	Seizures + arrhythmias	Airway + benzodiazepines	Lipid emulsion
CICV	No ventilation	SGA	Cricothyrotomy
High spinal	Bradycardia + apnea	Vasopressors	Ventilation support

🧩 5. Crisis Resource Management (CRM) Essentials

Every emergency requires:

Situational awareness
Clear leadership
Closed‑loop communication
Task delegation
Use of cognitive aids (emergency manuals)

These principles are emphasized in modern anesthesia crisis guidelines.
link.springer.com

🔍 6. What Would You Like Next?

Would you like a deep dive into airway emergencies, MH management, or anaphylaxis algorithms?

Emergency	Key Points
Malignant Hyperthermia	Triggered by volatile agents/succinylcholine; treat with dantrolene
Anaphylaxis	Epinephrine is first-line
Failed airway / Can't intubate, can't oxygenate (CICO)	Emergency front-of-neck access (cricothyrotomy)
Aspiration	Risk highest with full stomach; prevent with RSI
Local anesthetic toxicity (LAST)	Lipid emulsion rescue
Tension pneumothorax	Needle decompression

Anesthesiology