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Ventilation

About non invasive ventilation

What is Non-Invasive Ventilation?

Non-Invasive Ventilation (NIV) is normally used when oxygen levels in the blood are low and carbon dioxide levels are high. The ventilator helps you breathe out more carbon dioxide.
The term is used to describe how the ventilator (air pump) delivers air to your lungs under pressure which helps keep your airways and the air sacs in your lungs open and inflated.

Non-invasive means that this process is achieved simply by using a mask.


The ventilator automatically recognises when you breathe in, then assists and supports each breath you take working with your natural breathing pattern. This support means that you can take more air in with each breath, allowing more air into your lungs. You will also be able to get rid of the waste product carbon dioxide more easily, making you feel less breathless.
The airflow is strongest when you breathe in to help you take in as much air as possible, meaning that airflow is lower when you breathe out. This is commonly referred to as BiPAPTM (Bi-level Positive Airway Pressure).

The respiratory system

The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing.

When we breathe, we inhale oxygen and exhale carbon dioxide.

This exchange of gases is how the respiratory system gets oxygen to the blood. This is where the lungs come in.
You also need a muscle called the diaphragm – The diaphragm’s job is to help pump the carbon dioxide out of the lungs and pull the oxygen into the lungs. The diaphragm is a sheet of muscles that lies across the bottom of the chest cavity. As the diaphragm contracts and relaxes, breathing takes place. When the diaphragm contracts, oxygen is pulled into the lungs. When the diaphragm relaxes, carbon dioxide is pumped out the lungs.


There are two main reasons that problems and difficulties can happen with your breathing:

  • Obstruction

This is where the waste gas, the carbon dioxide is not able to leave the body as it should do. If it stays in your body it can cause breathlessness and coughing.

  • Muscle weakness

This is where your diaphragm does not work as well as it should to control the pumping of air in and out of your body. This means that not enough oxygen is brought into your blood cells.

Respiratory failure

Oxygen is needed to feed the blood cells and help all parts of your body work properly. People who have problems with their respiratory system, known as respiratory failure, may develop other symptoms, such as:

  • Restlessness, confusion and breathlessness.
  • Headaches, drowsiness and confusion.

These can develop because of the lack of oxygen in the blood cells as well as having too much carbon dioxide in the body.

Therapy benefits

The benefits of NIV include the following:

  • Improved lung function.
  • Better oxygen intake.
  • Improved flushing out of carbon dioxide when breathing more efficient.
  • A better night time sleep which may make you feel more alert and have more energy to perform tasks during the day.
  • Reduced morning headaches.
  • Reduced re-admissions to hospital.