Common Manual Resuscitator Failures (And How to Fix Them Fast)

In emergency situations, a manual resuscitator—often called a bag-valve mask (BVM) or AMBU bag—can mean the difference between life and death.
But even small malfunctions can compromise ventilation. Knowing how to spot and fix common issues is a critical skill for any healthcare professional.

Below, we break down the most frequent BVM problems, what causes them, and how to troubleshoot them on the spot.

1. Air Leaks During Use

Air leakage is the #1 complaint with manual resuscitators. It usually happens at three points: the mask seal, the valve connections, or the bag itself.

🔍 How to fix it:

• Reapply the mask to ensure a tight face seal. Adjust head positioning if needed.

• Check the inlet and outlet valves for cracks, dirt, or debris that might prevent sealing.

• Look over the bag for any visible tears, holes, or worn spots.

✅ A small leak can greatly reduce tidal volume. Always start troubleshooting at the mask.

2. Valve Malfunctions

Faulty valves directly affect airflow direction and volume. Here’s what to watch for:

🧪 Pro tip: Test all valves before putting a resuscitator into service. This prevents most field failures.

3. The Bag Won’t Refill

You squeeze the bag… and it stays flat. This is usually a refill issue, not a bag problem.

Common causes and fixes:

• Check oxygen tubing – kinks or blocks are the #1 cause.

• Look at the inlet valve – if stuck, it can’t draw air or O₂.

• Verify gas source – low pressure or empty tank = no refill.

Work from the outside in: tubing → connections → oxygen source → valve.

4. Poor Chest Rise (Even When Squeezing)

This is frustrating. You’re squeezing the bag, but the patient’s chest barely moves.

Step-by-step troubleshooting:

1. Recheck mask seal – a loose mask = lost volume.

2. Open the airway – use head-tilt, chin-lift or jaw-thrust.

3. Clear obstructions – suction if you suspect secretions or foreign body.

4. Inspect the resuscitator – bag tear or valve failure may reduce output.

👉 Poor chest rise is rarely just one issue. Always check both patient and equipment.

🛠️ Pre-Use Checklist (Prevents Most Failures)

Do this before every shift or patient contact:

• Squeeze the bag and watch for smooth refill.

• Listen for air leaks around valves and mask.

• Inspect all ports, tubing, and mask for cracks or blockages.

• Test oxygen flow if connected to a source.

• Store BVMs in clean, dry, and temperature-controlled conditions.

📅 Replace expired or worn parts immediately—don’t wait for failure.

🔄 When to Retire a Resuscitator

No BVM lasts forever. Replace yours immediately if:

• The bag is cracked, torn, or permanently deformed.

• Valves fail after cleaning and reassembly.

• The device has passed its expiration date (yes, BVMs expire).

• It no longer meets safety standards (ISO 10651-4, AHA guidelines).

💡 A failing BVM puts patients at risk. Reliable equipment saves lives—don’t compromise.