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Pressure support vent. (PSV)
is used to complement volume cycled modes Ex.SIMV,PSV alone is used for recovery of intubated patients who are not ready for extubation,augments inflation volumes during spontanious breaths,BiPAP=CPAP+PS
Time triggered ,Pressure limited, Dis.-requires frequent adjustments to maintain adequate Ve
vent delivers fixed volume,Pt recieves a set number of breaths and cannot breathe between vent breaths similar to pressure control
vent delivers fixed volume,Pt. initiates all breaths,but vent cycles in at initiationto give a preset Vt,Pt controls rate but always recives full machine breath
ventilator delivers fixed volume,it;s in assist mode unless Pt's respiratory rate falls below preste value,If RR fallvent then swithches to control mode
Volume cycled mode typically augmented with PS,Pt recieves a set number of vent breaths,differnt from control;Pt can initiate own spontaneous breath,different than Assist:Spont. breaths are not supported by machine with fixed Vt,Vetn always delivers breath even if Pt. is exhaling
most commonly used mode,consists of both spont. and mandatory breaths,If Pt has respiratory drive the mandatory breaths are synchronized with the Pt's inspiratiry effort
I:E ratio (IRV)
-increasing I-Time will increase Vt, but may lead to Auto-PEEP,better gas distribution with lower PIP
-elevated PIP suggests need for switch from vloume controlled to Pressure controlled ventilation-Maintained at <45cmH2O
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