Effective Bag-Mask Ventilation: Step-by-Step Technique for Rescuers

Mastering Bag-Valve-Mask (BVM) Ventilation

Effective BVM ventilation is a core resuscitation skill. Poor technique → gastric inflation, inadequate oxygenation, aspiration.

Preparation

• Airway: Head tilt–chin lift (no trauma) or jaw thrust (suspected C-spine injury).
• Mask Size: Covers bridge of nose to cleft of chin; no leak.
• Oxygen: Attach reservoir, flow 10–15 L/min → FiO₂ ~90–95%.
• Two-Person Technique Preferred: One holds mask (E-C clamp), one squeezes bag.

Step-by-Step: Two-Rescuer Technique

1. Position: Rescuer at head; second at side.
2. Mask Seal: Rescuer 1: Thumb/index = "C" on mask; remaining fingers = "E" lifting jaw (not neck).
3. Ventilate: Rescuer 2: Squeeze bag steadily over 1 second → visible chest rise.
4. Volume: ~500–600 mL (adult) or 6–8 mL/kg. Do not overinflate.
5. Rate: 10 breaths/min (adult) → 1 breath every 6 sec. With advanced airway: 10/min, asynchronous with compressions.
6. Monitor: Chest rise, capnography (ETCO₂), SpO₂, gastric inflation (epigastric auscultation).

One-Rescuer Technique (If Alone)

• Mask seal with non-dominant hand (E-C), squeeze bag with dominant hand. Harder to maintain seal + rate.

Critical Pitfalls to Avoid

• Excessive force/volume → barotrauma, gastric inflation → aspiration.
• Too fast → insufficient exhalation, air trapping.
• Leaky mask → inadequate tidal volume.
• Hyperextending neck (airway obstruction) or flexing (occlusion).
• Forgetting to connect oxygen.

Special Populations

• Infants/Children: Rate 20–30/min (1 breath every 2–3 sec), smaller volumes, avoid hyperextension.
• Obese/Pregnant: Ramp positioning, two-person essential, higher pressures may be needed.
• Stoma/Tracheostomy: Mask over stoma or pediatric mask; seal neck.

Quality Assurance

• Regular simulation training.
• Feedback devices (manikins with rate/volume monitoring).
• Debrief after real events.

BVM is a bridge – to advanced airway, ROSC, or transport. Proficiency saves lives.