either a chance in the flow (more sensitive, less patient effort required) or drops of
pressure in the ventilator circuit (less sensitive, more patient effort required).
- .Limit/control:
Based on what limits/controls the level of support of the set mandatory breath, the 2
traditional modes of conventional ventilations are:
Volume controlled (VC): level of support of mandatory breath is controlled/limited
by a preset tidal volume (Vt)
Pressure controlled (PC): level of support of mandatory breath is
controlled/limited by a preset peak inspiratory pressure (PIP).
If volume is set, pressure varies.....if pressure is set, volume varies..... according to
the compliance.....
COMPLIANCE = Volume / Pressure
Flow patterns are also different. In pressure control ventilation, the flow pattern is
decelerating; in volume control ventilation, the flow pattern is square (constant)