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Graphics
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Mechanical Ventilation
Ventilator Graphics
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Graphic Waveforms• Scalar graphics
• pressure vs. time• flow vs. time• volume vs. time
• Loop graphics• flow vs. volume• pressure vs. volume
Remember! (VC)• vol delivered depends on flow, TI• vol delivery is same each breath• flow waveform is same each breath• flow waveform does not change with
changing CL, RAW• pressure produced varies with CL, RAW,
type of flow waveform
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Pressure vs. Time
F = EEPC = start of pauseX + y = TI
E = early exp pressB = PIPy = pause
D = PplatA = start of inspx = TI
VCSIMV (VC)
z = TE
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F = EEPC = early insp press
E = early exp pressB = PIPz = TE
D = PplatA = start of inspx = TI
Pressure vs. TimePC
SIMV (PC)
Graphics
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Pressure vs. Time
P
tI
E
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Pressure vs. Time
P
t
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Pressure vs. Time
P
t
Graphics
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Pressure vs. Time
P
t
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Pressure vs. Time
P
t
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Pressure vs. Time
P
t
Graphics
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Pressure vs. Time
“Flow Starvation”
RX -
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Pressure vs. Time• Also examine negative pressure
deflection:
• too deep• lasts too long
⇒ ↑ WOB
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Pressure vs. Time
P
t
Graphics
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Pressure vs. Time• Summary - Use PT graphics to:
• ID breath type• adjust flow rate• assess work to trigger breath• detect autoPEEP• assess plateau & calculate CS