Advanced Modes of CMV. RC 270. Pressure Support = mode that supports spontaneous breathing. A preset pressure is applied to the airway with each spontaneous inspiration. Pressure Support. Pure assist mode Patient determines rate, Vt, and inspiratory time Inspiration is flow cycled
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A preset pressure is applied to the airway with each spontaneous inspiration
A set pressure is applied to the airway during inspiration and the breath time cycles
Control mode only
Patient is paralyzed
Settings like PCV except for inverse I:E (gives long insp time)
Prolonged insp time helps O2
To increase PaO2: increase rate, PIP or insp time
To decrease PaCO2: decrease rate or PIP
Alternating levels of CPAP in a spontaneously breathing patient
IPAP + EPAP
Differs from APRV – IPAP only during inspiration, EPAP only during expiration
Rate and I:E ratio can also be set
A form of ventilation utilizing high rates and small Vt that seems to enhance diffusion of gases into and out of the lung
HFV should not work based on classical respiratory physiology!
Both appear to cause diffusion to occur from proximal airway to alveoli
How does spontaneous breathing work?
Inspiration and expiration may be occurring simultaneously
HFV seems to stimulate mucociliary clearanceHFV (both HFJV and HFO)
Enough already! ARDS