press created by endotracheal tube, vent circuit or autopeep that causes increase pressure and therefore increases WOB
Type I Failure
Hypoxemic respiratory failure, PaO2 <60 on R/A, caused by VQ mismatch, shunt, diffusion impairment, perfusion/diffusion impairment, altitude
*Most easily reversible respiratory muscle weakness is
contractile, (overworked)
*Decreased vent drive
(type II) chemoreceptor’s responding to increased CO2 stimulate drive to breath, decreased by CNS depression (OD, brain lesion, hypothyroidism, obesity, cent sleep apnea, hypothermia) hallmark is brandypnea
*MIP
max inspiration press (bedside test), norm 80-120, manometer measures neg press, not pt dependent, can be done w/mask, most reliable bedside assessment
(type 1) rare cause of hypoxic resp failure caused by anatomical shunt secondary to liver disease, causes impaired gas exchange, FIO2 can help
Managing COPD’er on vent
COPD causes incr RAW and decreases exp flow, can easily cause autoPEEP aka hyperinflation and over distension, manage w/ decreased VT & rates and exp time
