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Ventilation Modes Explained

This document summarizes various ventilator modes including: 1) VC/AC - Volume controlled/assisted control where all breaths are machine controlled and volume/flow are variable based on patient compliance and resistance. 2) PC - Pressure controlled where pressure changes when compliance changes and volume is set by the respiratory care practitioner. 3) PRVC - Pressure regulated volume control where volume is set but pressure is variable based on compliance and resistance. 4) SIMV - Spontaneous/involuntary mode that allows for mandatory and spontaneous breaths with different waveforms and triggers.

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5K views1 page

Ventilation Modes Explained

This document summarizes various ventilator modes including: 1) VC/AC - Volume controlled/assisted control where all breaths are machine controlled and volume/flow are variable based on patient compliance and resistance. 2) PC - Pressure controlled where pressure changes when compliance changes and volume is set by the respiratory care practitioner. 3) PRVC - Pressure regulated volume control where volume is set but pressure is variable based on compliance and resistance. 4) SIMV - Spontaneous/involuntary mode that allows for mandatory and spontaneous breaths with different waveforms and triggers.

Uploaded by

ladyhavocinc
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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Mode Trigger Limit Cycle Pressure Flow Volume Notes

Time- no pt -Volume Volume- measured Exponential Square-Servo -Pressure variable based on


VC/AC trigger -Flow w/all wave by Flow/Time rise waveform Descending ramp- C* & R**
Press/Flow- pt form patterns optimal -All breaths are machine
trigger controlled
Descending ramp -Vol/Flow variable based on
PC Same as above Pressure Inspiratory Time Square C* & R**

Peak/Witch’s Hat waveform – what goes in should come out


-All breaths are machine
controlled
PRVC -Pressure -Volume set by RCP
PC with Vt Same as above -Volume Inspiratory Time Same as above Same as above -Vent does test breath to
guarantee measure C* to set P***
-P changes when C changes
Mandatory Breaths Same As VC --------- ------------------

mandatory breaths.
breathing between
SIMV-V Spontaneous- Time (Max It) Flow “dip-blip” Sine wave
Flow/Pressure

spontaneous
Allows for
Mandatory Breaths Same As PC --------- -------------
SIMV-P Spontaneous Breaths Same As SIMV-V --------- -------------
SIMV- Mandatory Breaths Same As PRVC --------- -------------
PRVC Spontaneous Breaths Same As SIMV-V ---------- ----------------

-Pressure -Pressure Descending ramp -Totally spontaneous


PS -Flow -Max It Flow Square -Pt controls It and Vol
VS Same as above -Volume Same as above Same as above Same as above -Sets PS same as PRVC
PS with Vt -Pressure -If apnea, vent changes to
guarantee PRVC
Same as above Pressure if CPAP Same as above “dip-blip” Sine wave All breaths are spontaneous
CPAP level set

BiPAP Same as above Pressure- separate Same as above Square Descending ramp Same as above
PS with PEEP I & E Pressures
APRV Pt can breathe spontaneously @ 2
different CPAP levels. Pt is usually
CPAP @ 2 Same AS CPAP ---------- ---------------- @ higher CPAP longer, released to
levels
lower CPAP for short periods
(inverse I:E)
C*= compliance R**= resistance P***= pressure

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