You've probably seen it in a movie, or in a real hospital emergency room (ETU), when someone is having trouble breathing, they put a mask on their face and give them oxygen through a small balloon-like bag attached to it. This type of mask is often used when a patient is brought in by ambulance. So, have you ever wondered what kind of special mask it is and what it does? Today we're going to talk about it. We call it a 'Non-Rebreather Mask'.
What is a Non-Rebreather Mask (NRM)?
Simply put, a Non-Rebreather Mask (NRM) is a medical device used to quickly provide
a very high concentration of oxygen to someone
in an emergency . This is a face mask designed to cover both your mouth and nose. It is secured to your face with an elastic band that goes around your head. This mask has a small bag filled with oxygen attached to it. This is called a 'Reservoir Bag'. This bag is connected to an oxygen tank through a tube. The main purpose of this is to quickly provide a large amount of oxygen to someone whose blood oxygen level has dropped dangerously low and stabilize them.
How does this mask work? What's so special about it?
The biggest feature of this mask is its
'one-way valve' system. Think of it like a door that only opens in one direction. This is what happens:
- When you breathe, only the pure oxygen filled in the Reservoir Bag from the oxygen tank goes into your lungs .
- When you exhale, the air containing carbon dioxide goes out through other valves on the sides of the mask, and does not re-enter the oxygen bag.
- Also, normal air from the outside environment does not enter the mask.
That's why it's called a 'Non-Rebreather'. That means you don't get to breathe in the breath you exhale. Because of this, the amount of oxygen you get is very highly concentrated, without being diluted by anything.
Normally, the air we breathe contains only 21% oxygen. While a normal oxygen mask provides between 40%-60%, this NRM can provide a high oxygen percentage (FIO2 - fraction of inspired oxygen) of 60% to 90% .
In what situations is an NRM used?
This is used in emergencies where the patient
is able to breathe on their own , but the oxygen level in their blood is very low. Some examples are:
- Smoke inhalation: When smoke is inhaled during a fire.
- Carbon monoxide poisoning : This can be caused by certain types of smoke, vehicle exhaust, etc. In this situation, high levels of oxygen should be given immediately. If such poisoning is suspected, it is very important to immediately call the National Poison Information Center at the Colombo National Hospital and seek advice.
- Trauma to the lungs: When the chest and lungs are damaged by an accident.
- Cluster headaches : A very severe, recurring headache.
- Severe, chronic respiratory diseases such as COPD or Cystic Fibrosis : In cases of exacerbation of these diseases.
What are the benefits and biggest risks of this mask?
| Type | Description |
|---|
| Main advantage | The ability to deliver a very high concentration of oxygen to a patient very quickly can save the life of a patient who is having difficulty breathing. |
| Main risk | Suffocation. This is the biggest and most dangerous risk of this mask. Because it does not allow outside air to enter, if the oxygen tank becomes empty, the patient will not get any air to breathe. For this reason, this mask is always used only under the close supervision of a medical staff member, such as a doctor or nurse, in a hospital or ETU. |
Can I use this mask at home?
Absolutely not. A Non-Rebreather Mask is a device that is used only in emergency situations, in a hospital setting. It is not recommended for use at home due to the risk of suffocation. If you need oxygen treatment at home due to a chronic respiratory condition, there are other safe methods for doing so. For example, a ``Nasal Cannula`` device with two small tubes that are inserted into the nose. Your
doctor will explain to you which oxygen treatment method is most suitable for your condition.
Symptoms of difficulty breathing that require immediate medical attention
If you or someone you know has difficulty breathing and one or more of the following symptoms,
go to a hospital's Emergency Department (ETU) or see a doctor immediately .
| Symptom | Simple explanation |
|---|
| Lips turning pale or blue | A major symptom of the body not receiving enough oxygen. |
| Breathing very fast or hard | If it seems like you are struggling to breathe. |
| Nasal flaring | Especially in young children, the nostrils swell when breathing is difficult. |
| Abnormal sounds when breathing | If you hear wheezing or other strange sounds. |
If you are having trouble breathing regularly, talk to your doctor about it. It is very important to find the cause and get the treatment that is right for you.
Take-Home Message
- A Non-Rebreather Mask (NRM) is a special mask that quickly delivers a high concentration of oxygen in an emergency.
- This prevents the breath you exhale from going back in, which is why you get more oxygen.
- The biggest risk with this is the possibility of suffocation if the oxygen tank becomes empty.
- For this reason, this mask is only used under medical supervision in a hospital. It is not suitable for use at home.
- If you are having any kind of breathing difficulty, be sure to talk to your doctor about it and get proper treatment.
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