BVM Technique: How to Actually Move Air (and Pass the Skill)

Bag-valve-mask ventilation is the most-tested and most-failed airway skill in EMS. The bag is easy; the seal is not. Almost every failed BVM attempt is a leak problem, not a squeezing problem.

Get the seal first

1. Open the airway: head-tilt chin-lift, or jaw thrust if trauma is suspected.
2. Insert an OPA (unconscious, no gag) or NPA — an adjunct is expected on the exam.
3. Size the mask so it bridges the nose and sits in the groove above the chin.
4. Two-person technique when available: one provider does a two-handed E-C or thenar grip, the other squeezes.

Rate and volume

• Adult apneic patient: 1 breath every 5–6 seconds (10–12/min).
• Child or infant: 1 breath every 3 seconds (20–25/min).
• During CPR with an advanced airway: 1 breath every 6 seconds, no pausing compressions.
• Squeeze until you see chest rise over about 1 second — that is roughly 500–600 mL, not the whole bag.

Confirming it works

Visible chest rise, improving SpO2, and waveform capnography with an EtCO2 of 35–45 mmHg. Gastric sounds or a rising abdomen mean your rate or volume is too high, or the airway is not open.

Common critical failures

• Ventilating too fast — the single most common error in real calls and on exams.
• Failing to insert an airway adjunct.
• Not connecting high-flow oxygen to the reservoir (15 L/min).
• Interrupting ventilations for more than 30 seconds.

When BVM fails

Reposition, re-seal with two hands, re-suction, then escalate to a supraglottic airway. Do not keep bagging a leaking mask for minutes — hypoxia is the outcome the exam is testing you on.