Oxygen isn't everything:
Why CO₂-Management in the hyperbaric oxygen chamber is crucial

Introduction

In Hyperbaric Oxygen Therapy (HBOT), the focus is usually on one goal: absorbing as much oxygen as possible. But this is precisely where a critical fallacy arises.

For while many try to maximize the oxygen content, a crucial factor is often overlooked: the effective removal of carbon dioxide (CO₂).

In this article, you will learn why the so-called „optimizing“ of oxygen through improper mask use can be counterproductive – and how to make your hyperbaric session truly safe and effective.

 

The common mistake: „Sealing“ masks for more oxygen

In practice, it repeatedly happens that users or operators:

• close the side valves of non-rebreather masks
• try to artificially increase the oxygen concentration

 

The assumption behind this:
-> More oxygen = better therapy

Yet that is precisely a misconception.

 

Why more oxygen is not automatically better

Under hyperbaric conditions (e.g., at 1.5 ATA), your body is already in a state of extreme oxygen saturation.

That means:

• Even with 85 % oxygen, the body is already receiving its maximum supply.
• Increasing it to, for example, 93 % results in no relevant added benefit.

 

-> The difference is physiologically negligible.

 

The real problem: CO₂Rebreathing

When you close the valves on a mask, the following happens:

• Exhaled air remains in the mask
• CO₂ accumulates in the so-called dead space
• You are breathing a part of this CO₂ another

 

That is called Rebreathing.

 

Why CO₂ is more dangerous than too little oxygen

The human body reacts more strongly to CO₂ than to oxygen.

Even small increases can lead to:

• faster, shallower breathing
• elevated heart rate
• Restlessness and stress
• Headaches
• Difficulty concentrating

 

In more severe cases:

• Confusion
• Fear
• in extreme cases unconsciousness

 

The tricky part: you often realize it too late

One particularly critical point:

-> Under hyperbaric conditions, your oxygen saturation (SpO₂) at 100 %.

That means:

• Pulse oximeters show „perfect values“
• There are no visible warning signs
• Symptoms are often misinterpreted

 

Many people then think, „The therapy is working.“
In reality, there might already be a CO₂-overload (hypercapnia).

 

The physiology behind it

An adult produces about:

• 200 ml CO₂ per minute

 

Due to poor breathing technique (short, rapid inhalation and exhalation) or hyperventilation (uncontrolled rapid breathing), part of the exhaled ₂ re-inhaled. This is how the CO₂- levels in the blood can quickly develop into a critical value:

• As early as 2–3 % CO₂ can become problematic in the breathable air.
• CO₂Values in the blood increase significantly.
• Symptoms develop insidiously.

Why the chamber is actually safe – and what sabotages it

Modern hyperbaric chambers are designed so that:

• fresh air is continuously supplied
• CO₂ is actively dissipated
• safe concentrations are maintained

 

-> Goal: under 2,500 ppm CO₂ inside the vehicle.

YET, when you seal a mask, here is what happens:

• The ventilation in the mask is no longer working
• CO₂ remains directly in front of your face
• the entire security concept is bypassed

 

The Right Priority (Crucial!)

Many make a fundamental mistake in the sequence:

 

Wrong:

1. Maximize oxygen
2. CO₂ ignore

 

The correct answer is:

1. Respiratory comfort
2. CO₂Removal
3. Oxygen concentration

 

-> Exactly this order determines the success of the therapy!

 

Which Breathing Systems Are Recommended

Not every respiratory solution is equally suitable.

Particularly recommended:

• Nasal cannulas
• Nasal Buds / Nasal Pillows

 

-> Advantages:

• minimal dead space
• low CO₂Rebreathing
• high comfort
  

Partially suitable:

• Non-rebreather masks (with open valves/exhalation check valves)

 

-> Only at:

• sufficient airflow
• correct usage

 

Not recommended:

• Non-rebreather masks with closed valves

 

-> High CO₂-Risks.
-> No additional benefit.

 

Practical recommendations

When using hyperbaric sessions, please note:

• Never block mask valves.
• Ensure free air circulation.
• Choose comfortable breathing systems.
• Observe symptoms such as:
  the feeling of warmth
  and restlessness
  Oh, headache

 

-> These can be on CO₂ point out – not to „good effect“.

 

Conclusion

More oxygen is not automatically better.

Hyperbaric therapy is not just about oxygen uptake, it is about a finely tuned balance between oxygen and CO₂.

If you ignore this balance, you risk:

• lower therapeutic effects
• Discomfort
• in the worst case, health problems

 

The most important takeaway:
Clean breathing is more important than maximum oxygen concentration.

 

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FAQS – Frequently Asked Questions

Isn't more oxygen always better?

No. Beyond a certain point, more oxygen provides no additional benefit.

Why is CO₂ So problematic?

Because your body is sensitive to it and it directly affects your breathing and your well-being.

How do I recognize too much CO₂?

Typical signs are:

• Sensation of warmth
• Unrest
• Headaches
• faster breathing
  

Can I measure that with a pulse oximeter?

No. It only shows oxygen, not CO₂ an.

Which breathing method is best?

For most users:

• Nasal cannulas or nasal buds

Are masks generally bad?

No – only incorrectly used masks can be problematic.

What is the biggest mistake?

The sealing of the mask valves.

Why does this error happen so often?

Because many think that maximum oxygen supply automatically brings better results.

What is more important than oxygen?

The CO₂-Removal and breathing comfort.

Does proper breathing improve therapy?

Yes – often significantly stronger than a minimal increase in oxygen concentration.

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