The 2025 Guidelines from the American Heart Association recognize that cardiac arrest and peri-arrest states arising from special clinical circumstances often require modification of standard BLS and ALS protocols.
These updates integrate toxicology, environmental emergencies, pregnancy, anaphylaxis, respiratory failure, device-related arrests, and advanced support strategies such as extracorporeal life support (ECLS/ECMO).
1. Anaphylaxis-Associated Cardiac Arrest – Shift in Management Priorities
Fluid resuscitation
• Isotonic IV fluids are reasonable for intravascular volume depletion
COR 2a | LOE C-EO
Epinephrine (IM standard anaphylaxis dose)
• Effectiveness in cardiac arrest is UNCERTAIN
COR 2b | LOE C-EO
Clinical implication:
Standard IM anaphylaxis dosing may be insufficient during arrest compared with IV/IO dosing.
Glucagon (when β-blocker exposure suspected)
• May be reasonable in refractory cases
COR 2b | LOE C-EO
Extracorporeal CPR (ECPR/ECMO)
• Reasonable in refractory anaphylaxis-related cardiac arrest
COR 2a | LOE C-EO
2. Asthma & Severe Airway Obstruction – Focus on Physiology
Sudden difficulty ventilating or rising airway pressures:
👉 Evaluate for tension pneumothorax immediately
COR 1 | LOE C-LD
Ventilation strategy:
• Low tidal volume
• Low respiratory rate
• Prolonged expiratory time
Adults: COR 2a | LOE C-LD
Children: COR 2a | LOE C-EO
Purpose: reduce air trapping and intrinsic PEEP.
Advanced rescue therapies:
• ECMO/ECLS reasonable in refractory cases
COR 2a | LOE C-LD
• Volatile anesthetics may be considered
COR 2b | LOE C-LD
• Active exhalation maneuvers may be considered
COR 2b | LOE C-EO
3. Extreme Temperature Emergencies
Hyperthermia (heat stroke, stimulant toxicity)
👉 Rapid cooling recommended
• Target ≥0.15°C/min
• Ice-water immersion preferred
Strong emphasis on aggressive early cooling.
Hypothermia
• Continue CPR while rewarming
• Survival possible even after prolonged arrest
👉 ECLS rewarming reasonable when available
Key principle:
“Not dead until warm and dead.”
4. High-Consequence Respiratory Pathogens (e.g., COVID-like scenarios)
• Chest compressions, bag-mask ventilation, suctioning, intubation are aerosol-generating
👉 PPE use strongly emphasized
However:
Real-world data show low transmission risk when PPE is used appropriately.
Clinical balance:
Rescuer safety while avoiding unnecessary CPR delays.
5. Hyperkalemia in Cardiac Arrest – Less Routine Drug Use
IV calcium & sodium bicarbonate
• Evidence for improved survival is LIMITED
Utility remains uncertain when CPR interruptions occur.
Key takeaway:
Do not delay high-quality CPR and defibrillation for metabolic therapies.
6. Pregnancy-Associated Cardiac Arrest
Key priorities reinforced:
• Early airway management
• Left lateral uterine displacement to relieve aortocaval compression
• Consider resuscitative hysterotomy when indicated with delivery within 5 mins of cardiac arrest
Emphasis on modified physiology and rapid multidisciplinary response.
7. LVAD Patients in Arrest
Because pulse may be absent even with flow:
Assess perfusion using:
• Skin color & temperature
• Capillary refill
• MAP
• ETCO₂
Management:
• Start CPR immediately
• Simultaneously assess LVAD function and power supply
8. Opioid-Related Arrest
Respiratory arrest:
👉 Naloxone SHOULD be given
Cardiac arrest:
👉 Naloxone MAY be reasonable if it does not interrupt CPR
Reinforces early overdose reversal within resuscitation chain.
9. Alternative CPR Techniques – Mostly DISCOURAGED
❌ Precordial thump
Not recommended in adults or children
COR 3 (No Benefit)
❌ Routine percussion pacing
Not recommended in adults or children
COR 3 (No Benefit)
⚠️ Cough CPR
• May be considered only in witnessed, monitored adult arrhythmias prior to LOC
• NOT routine
• NOT for children
⚠️ Interposed abdominal compression CPR
Effectiveness uncertain in adults and children
Overarching Messages from Special Circumstances 2025
• High-quality CPR and defibrillation remain the foundation
• Identify and rapidly treat reversible causes
• Use ECMO strategically in select refractory scenarios
• Avoid unproven mechanical or drug adjuncts
• Modify ventilation and positioning based on physiology
• Systems of care and preparedness matter greatly
Clinical Bottom Line
The 2025 updates emphasize:
Precision over tradition
Physiology over reflex interventions
Fundamentals over experimental techniques
Special circumstances demand tailored resuscitation, but never at the cost of high-quality CPR and early defibrillation.
Source:
2025 AHA Special Circumstances of Resuscitation Guidelines