Pressure support ventilation

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Pressure support ventilation (PSV), also known as pressure support, is a spontaneous mode of ventilation. The patient initiates every breath and the ventilator delivers support with the preset pressure value. With support from the ventilator, the patient also regulates his own respiratory rate and tidal volume.[1]

In Pressure Support, the set inspiratory pressure support level is kept constant and there is a decelerating flow. The patient triggers all breaths. If there is a change in the mechanical properties of the lung/thorax and patient effort, the delivered tidal volume will be affected. The user must then regulate the pressure support level to obtain desired ventilation.[2][3]


Pressure support improves oxygenation,[4] ventilation and decreases work of breathing.


Pressure support improves patient ventilation.[5]

Work of breathing[edit]

Pressure support decreases overall work of breathing when used in tandem with an intermittent mechanical ventilation mode.[6]


  1. ^ Bonett S, Banner MJ, Euliano NR, Peters CW, Layon AJ, Gabrielli A (2011). "Pressure support ventilation advisory system provides valid recommendations for setting ventilator". Respir Care. 56 (3): 271–7. doi:10.4187/respcare.00656. PMID 21235833.
  2. ^ MAQUET, "Modes of ventilation in SERVO-i, invasive and non-invasive", 2008 MAQUET Critical Care AB, Order No 66 14 692
  3. ^ MAQUET, "Modes of ventilation in SERVO-s, invasive and non-invasive", 2009 MAQUET Critical Care AB, Order No 66 61 131
  4. ^ Spieth PM, Carvalho AR, Güldner A, et al. (April 2011). "Pressure support improves oxygenation and lung protection compared to pressure-controlled ventilation and is further improved by random variation of pressure support". Critical Care Medicine. 39 (4): 746–55. doi:10.1097/CCM.0b013e318206bda6. PMID 21263322.
  5. ^ Goodyear-Bruch C, Long LR, Simon P, Clancy RL, Pierce JD (August 2005). "Pressure-support ventilation and diaphragm shortening in the rat model". AANA Journal. 73 (4): 277–83. PMID 16108409.
  6. ^ Pierce JD, Wiggins SA, Plaskon C, Glass C (1993). "Pressure support ventilation: reducing the work of breathing during weaning". Dimensions of Critical Care Nursing. 12 (6): 282–90, quiz 294. doi:10.1097/00003465-199311000-00001. PMID 10838991.