CPR Barrier Devices: Why They're Essential for Rescuer and Victim Safety

Purpose of Barrier Devices

Barrier devices (face shields, pocket masks, bag-valve masks with filters) create a physical barrier between rescuer and victim during rescue breathing and chest compressions.

Key Protections

Risk	Barrier Protection
Rescuer exposure to victim's body fluids	Blood, saliva, vomit, respiratory secretions – may carry HIV, HBV, HCV, TB, COVID-19, other pathogens
Victim exposure to rescuer's fluids	Rescuer's respiratory droplets, oral flora
Psychological barrier	Increases willingness to perform rescue breaths (especially bystanders)
Aerosol generation	Filters (in some masks) reduce aerosolized particles during compressions/ventilations

Types of Barrier Devices

• Face shield / flat barrier: Compact, one-way valve, fits in keychain pouch. For rescue breaths only.
• Pocket mask: Rigid/malleable mask with one-way valve, oxygen inlet (optional), head strap. Better seal, can deliver higher O₂.
• Bag-valve-mask (BVM): Professional use; with viral filter (HEPA) on exhalation port.
• Supraglottic airways (i-gel, LMA): Advanced airway; not for lay rescuers.

Current Guidelines (AHA/ERC 2020)

• Lay rescuers: Hands-only CPR (compressions only) is recommended if unwilling/unable to give breaths. If trained and willing, use barrier device for breaths (30:2).
• Healthcare providers: Use barrier device or BVM with filter for all ventilations.
• Compressions-only CPR is better than no CPR – do not delay compressions to find a barrier.

Key Point

Barrier devices protect both parties and increase bystander willingness to ventilate. However, high-quality chest compressions are the priority. Don't interrupt compressions to search for a barrier – start compressions immediately.