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
The respiratory rate is the rate at which breathing occurs; it is set and controlled by the respiratory center of the brain. A person's respiratory rate is usually measured in breaths per minute.
Measurement
The respiratory rate in humans is me ...
and
tidal volume
Tidal volume (symbol VT or TV) is the volume of air moved into or out of the lungs during a normal breath. In a healthy, young human adult, tidal volume is approximately 500 ml per inspiration or 7 ml/kg of body mass.
Mechanical vent ...
.
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.
[MAQUET, "Modes of ventilation in SERVO-s, invasive and non-invasive", 2009 MAQUET Critical Care AB, Order No 66 61 131]
Oxygenation
Pressure support improves oxygenation,
ventilation and decreases work of breathing.
Ventilation
Pressure support improves patient ventilation.
Work of breathing
Pressure support decreases overall work of breathing when used in tandem with an
intermittent mechanical ventilation mode.
References
{{Mechanical ventilation
Mechanical ventilation