Non-invasive ventilation refers to oxygen given to a patient without the use of an invasive artificial airway- a tracheostomy tube or an endotracheal tube, according to European Respiratory Review.

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It is administered through nasal mask, face mask, or helmet and is considered an effective treatment method for respiratory failure in chronic obstructive pulmonary disease, as per Physiopedia.

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NIV can be administered using two techniques-positive pressure and negative pressure. Through the negative pressure method, pressure is applied externally to the thorax and the abdomen in order to draw air through the lungs to the airway. On the other hand, in the positive pressure technique, the pressure is applied directly to the airway, according to European Respiratory Review. 

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