A push of air. Pressure support helps move air in when a person inhales, by giving a little extra push to the air. This helps the lungs open up a little more, and helps prevent exhaustion by helping the person work a little less hard to breath.
Assist normal breath. Pressure support breathing on mechanical ventilation is a way to assist a 'normal' breath of a patient with an endotracheal or tracheostomy tube (temporary or longer term 'breathing tube' in the trachea or 'wind pipe' going to the lungs). In other words, each breath that a patient takes on their own is helped but not controlled. Sometimes used to assess if ready to come off the ventilator.
PSV. Pressure support ventilation is used for patients who are on mechanical ventilation for respiratory failure. It is a level of support (usually a level of pressure e.g. 10 cm h2o) that is introduced by the ventilator to support (augment) patient's spontaneous breath. You may read more about this in: hasan ra, kaynar m, a pocket guide to mechanical ventilation@ amazon.Com.