Non-rebreather mask

From WikiMD's medical encyclopedia

Non-Rebreather Mask (NRB) in Oxygen Therapy

Overview

A non-rebreather mask (NRB) is a medical device used in oxygen therapy to deliver high concentrations of oxygen to patients who are breathing unassisted. Unlike low-flow devices like nasal cannulae, NRBs are designed to provide a higher oxygen concentration.

A non-rebreather mask in use

Design and Function

The NRB consists of:

  • A face mask with a reservoir bag attached
  • A one-way valve system preventing exhaled air from re-entering the bag
  • Adjustable straps for securing the mask to the patient's face
  • Oxygen inlet connected to an oxygen source

Indications for Use

NRBs are typically used in situations where high concentrations of oxygen are required, such as:

Benefits

The primary benefits of using an NRB include:

  • Delivery of a high concentration of oxygen (up to 100%)
  • Quick improvement in patient oxygenation

Limitations and Risks

Limitations and risks associated with NRBs:

  • They require the patient to be breathing unassisted
  • Potential risk of carbon dioxide buildup if the mask is not fitted properly
  • In the event of a source gas failure, the lack of inhaled air can be life-threatening

Safety Precautions

To ensure patient safety, it is essential to:

  • Regularly check the oxygen source and reservoir bag
  • Ensure a proper fit to avoid CO2 buildup
  • Monitor the patient's respiratory status closely

Comparison with Other Oxygen Delivery Systems

Differences between NRBs and other systems like nasal cannula and venturi mask:

  • NRBs deliver higher oxygen concentration
  • NRBs are for patients who can breathe unassisted, unlike some other oxygen delivery systems

References

External Links

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