ventilator graphics
TRANSCRIPT
Objectives:
• Introduction
• Why We Need To Know About The Ventilator Graphics ?
• Types Of Waveforms
• Types Of Breath
• Normal And Abnormal Waveforms
Introduction:
Monitoring and analysis of graphic display of curves and loops during mechanical ventilation has become critical to determine how patient is being ventilated to assess problems occurring during ventilation.
Mode function
Auto PEEP
Synchrony
TriggerWOBOver distension
PEEP
Ti
Leak
Flow cycle
Time rise
Active exhalation
Why we need to know about the ventilator graphics ?
Types Of Waveforms:
VC-CMV SIMV+VC
PC-CMV VAP APRV SIMV+PCPSVPRVC VSV
• Constant • Sinusoidal • Ascending • Descending • Exponential
• Ascending• Sinusoidal
• Constant• Exponential
• Constant • Sinusoidal • Ascending • Descending • Exponential
• Ascending • Sinusoidal
• Constant• Exponential
VC PC
?
Time (sec)
Pre
ssu
re
(cm
H20)
Type Of Breath:
Mandatory Assisted Spontaneous
Time (sec)
Inspiration
Expiration
Pa
w (
cm H
20)
Time (sec)
Pa
w
(cm
H2O
)
Pa
w
(cm
H2O
)
Time (sec)
P-T
PIP
Transairway Pressure (PTA)} Pplateau
PEEP
Begin Inspiration Begin Expiration
AB
C
A= airway RawB= Alveolar distending pressure ABC = MAP
Time rise:
Minimal Pressure Overshoot
Slow rise Moderate rise Fast rise
P
What is the benefit of the time rise ?
Inspiration
Expiration
Time (sec)
Flo
w (
L/m
in)
TI TE
F-T
Beginning of inspiration exhalation
valve closes
Peak inspiratory
flow rate PIFR
End inspiration and beginning of
expiration exhalation valve opens
Peak expiratory flow rate PEFR
ID breath type.
ID waveform type.
What is the abnormalities?
In which clinical condition we might
see these waveforms?
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Increase Raw
What do these curves
indicate?
PC302928272625242322212019181716151413121110987654321
Decrease Compliance
ID breath type.
ID waveform type.
What is the abnormalities?
In which clinical condition we might
see these waveforms?
VC302928272625242322212019181716151413121110987654321
Decrease compliance
Click icon to add picture
What do these curves
indicate?
302928272625242322212019181716151413121110987654321
Inadequate Flow “ F low Starvati on”
Click icon to add picture
What do these curves
indicate?
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Acti ve Exhalati on
WOB
Pressure (cm H2O)
Volu
me (
ml) E
I
The more vertical the loop lays, the higher the lung compliance, the more horizontal it
lays, the lower the lung compliance. Thus slope
of the line equals compliance.
The fatter the loop, the higher the airway resistance…you can
tell if it’s I or E resistance by looking
at whether the right or left side bulges out
more
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Decrease compliance e.g. ARDS, atelectasis
and CHF
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Increase compliance
Click icon to add picture
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Inadequate Sensiti vity
Click icon to add picture
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Leak
What does this loop indicate?
302928272625242322212019181716151413121110987654321
I n a d e q u a te F l o w “ F l o w S ta r va ti o n ”
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Acti ve Exhalati on
Click icon to add picture
What does this loop indicate?
302928272625242322212019181716151413121110987654321
Increase Raw
Click icon to add picture
What is going on here?
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Assessment of pressure, flow and volume waveforms is a critical tool in the management of the mechanically
ventilated patient.
References:
• Pilbeam’s Mechanical Ventilation, 5th edition.
• Curves and Loops in Mechanical Ventilation, dragger booklet.
• Handbook of Mechanical Ventilation, Kumar B Umesh, 2011.
• Maquet pocket guide,
• Ventilator Graphics and Respiratory Mechanics in the Patient With Obstructive Lung Disease, 2005.