During resuscitation, especially in cardiac arrest or peri-arrest situations, airway and ventilation can make or break the outcome. Rookies often focus on chest compressions or drug administration and overlook whether their ventilations are actually effective. But ventilation errors are common—and dangerous. This article will help you identify when ventilation isn’t working and what to do about it.
Why It Matters
- Inadequate ventilation = hypoxemia, hypercapnia, poor perfusion, worse outcomes.
- Hyperventilation = gastric insufflation, aspiration, decreased venous return, worsened cardiac arrest survival.
- Effective ventilation provides oxygenation without compromising compressions.
Signs of Inadequate Ventilation
1. Chest Rise and Fall
- Absent or minimal rise → poor mask seal, obstruction, or inadequate volume.
- Excessive rise → over-ventilation, gastric inflation.
Rookie pearl: Don’t stare at the bag—watch the patient’s chest.
2. Pulse Oximetry
- Persistent low SpO₂ (<90%) despite oxygen and compressions = poor ventilation.
- Be cautious: in low-perfusion states, SpO₂ can lag or be unreliable.
3. Capnography (EtCO₂)
- Gold standard for confirming ventilation adequacy.
- Normal during resuscitation: 10–20 mmHg in high-quality CPR.
- Low/flat waveform → inadequate ventilation, poor perfusion, or misplaced airway.
- Sudden rise in EtCO₂ → possible ROSC.
4. Breath Sounds
- Absent/unilateral → esophageal intubation, right mainstem intubation, or obstruction.
- Crackles/wheezes → underlying lung pathology worsening ventilation.
5. Patient Physiology
- Persistent cyanosis, bradycardia in children, agitation in non-arrest → all signs of inadequate oxygen delivery.
Common Causes in Resuscitation
| Cause | What You’ll See | Fix |
|---|---|---|
| Poor mask seal | No chest rise, low SpO₂ | Switch to 2-person BMV, insert OPA/NPA |
| Airway obstruction | No chest rise, stridor, difficulty bagging | Suction, reposition head, consider intubation |
| Tube misplacement | No breath sounds, no EtCO₂ | Reattempt intubation or use SGA |
| Gastric insufflation | Distended abdomen, poor chest rise | Ventilate gently, slower rate |
| Equipment failure | Bag not refilling, loose connections | Check oxygen, valves, mask, tubing |
How to Avoid Rookie Errors
- Always confirm EtCO₂ waveform with advanced airway.
- Use 2-person BMV in critically ill patients (one seals, one squeezes).
- Deliver breaths at the correct rate:
- With advanced airway: 1 breath every 6 sec (10/min).
- Without advanced airway: 2 breaths every 30 compressions.
- Use just enough volume to see chest rise—not maximal squeeze.
- If sats aren’t improving, don’t keep bagging blindly—stop and troubleshoot.
Special Considerations
In Cardiac Arrest
- Avoid hyperventilation → raises intrathoracic pressure, reduces coronary perfusion.
- Maintain 10 breaths/min with continuous compressions.
In Pediatrics
- Bradycardia often results from hypoxemia, not poor compressions. If HR is low, reassess ventilation immediately.
In Trauma
- Chest rise may be absent due to pneumothorax—don’t confuse this with poor technique. Look for asymmetric expansion and intervene if needed (needle decompression, chest tube).
Rookie Pearls
- Your best monitor is your eyes: chest rise, color, condensation in mask/tube.
- Waveform capnography is non-negotiable—never assume ventilation is working without it.
- Troubleshoot quickly: if sats are dropping, step back, reposition, suction, and reattempt.
- In the chaos of a code, assign one person solely to the airway—otherwise, it gets neglected.
Take-Home Message
In resuscitation, inadequate ventilation is silent but deadly. Rookies should train themselves to constantly reassess chest rise, SpO₂, EtCO₂, and breath sounds. If something doesn’t add up, fix it immediately.
Remember: Oxygenation > Intubation. You don’t win by putting the tube in—you win by ensuring air actually moves in and out.
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