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8/6/2019 Ards Seminar
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PRESENTER :
2 5/19/2011
MODERATER :
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Basic Insult is Damage to Lung
Lung Unit ² the Alveoli
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Therapy
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816
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� Both Volume cycled ventilation (VCV) and
Pressure controlled ventilation (PCV) modes can be used with lung protective strategy
depending upon whether it is more important to
control airway pressures or to control tidal volume .
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� However, choosing appropriate ventilatory goals
(VT and airway pressure) is far more important than
the particular mode.
� In general, fully supported modes of ventilation (e.g.
A/C) are favored over partially-supported modes
( SIMV + PSV OR SIMV only) particularly early in
the course of the disease.
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The open lung concept is physiologically based
on the Law of Laplace. Adhering to the principles of the open lung concept, pressure
controlled ventilation may improve patient
out come during Mechanical Ventilation
P = 2T/R
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Pois euille's
P = 2T/R
Alveolar stability Alveolar stability
The degree of this surfactant The degree of this surfactant damage will determine the damage will determine the
amount of pressure needed to amount of pressure needed to
expand alveoli from closed to expand alveoli from closed to open .open .
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� This combines low tidal volume
� Optimally applied PEEP to maximize alveolar
recruitment and aims to mitigate alveolar over- distension and cyclic Atlectasis.
� The goal of the open lung concept procedure is
to recruit alveoli and maintain them open with the least changes in pressure to minimize
alveolar shear forces 5/19/2011 41
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A ² alveoli derecruitment
B ² optimal recruitment inflation C ² alveolar over distension
D ² optimal inflation Optimal Volume Optimal Volume
Optimal Optimal
PEEP PEEP
CC
BB
AA
DD
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A ² alveoli derecruitment
B ² optimal recruitment inflatio C ² alveolar over distension
D ² optimal inflation Optimal Volume Optimal Volume
Optimal PEEP Optimal PEEP
CC
BB
AA
DD
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Calculating Predicted Body Weight
Male = 50 + 2.3 (height in inches - 60)
Male = 50 + 0.91(height in cm - 152.4)
Female = 45.5 + 2.3 (height in inches - 60)
Female = 45.5 + 0.91 (height in cm - 152.4)
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Excess PP >50 mmHg can lead to air leaks
Pneumothorax , Pneumomediastinum, SC
Emphysema, Pneuopericardium
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Gas
ExtravasationBarotrauma
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Damage to the lung (Alveoli) caused by Over distension by a Mechanical Ventilator set
for an excessively high tidal Volume ( ?)
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Low lung volume surfactant is squeezed out leading to
alveolar collapse, repeated collapse and reopening leads to
a shear stress particularly early in the course of lung injury.
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´Shearµ
Airway Trauma Airway Trauma
Stretch
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Inflammatory products are released secondary to mechanical factors lead to
MODS.
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Place on Pressure Control Place on Pressure Control
Raise Peak Inspiratory pressure to 40 Raise Peak Inspiratory pressure to 40 - -60 cmH2O 60 cmH2O 10 breaths Minimal 10 breaths Minimal
Adjust peak Inspiratory Pressure to lowest Adjust peak Inspiratory Pressure to lowest
Pressure without loss of recruitment Pressure without loss of recruitment
Titrate ventilator P I P and Titrate ventilator P I P and
Mean Inspiratory pressure to the smallest Mean Inspiratory pressure to the smallest
Possible difference Possible difference
I : E Ratio 1 : 1 or 2 : 1I : E Ratio 1 : 1 or 2 : 1
PEEP 10 PEEP 10 ² ² 20 cm 20 cm
Keep PEEP in range of Keep PEEP in range of
10 10 ² ² 20 cm 20 cm
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� Perfluorocarbon have excellent oxygen and carbon
dioxide carrying capacity (50 ml O 2 /dl and 160-210
ml CO 2 /dl, respectively).
� They are clear, odorless, inert fluids which are
immiscible in aqueous and most other solutions
� 2 types of techniques : TLV -- PLV
� TOTAL LIQUID VENTILATION
� PARTIAL LIQUID VENTILATION
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� Virtually all the other commercially available
perfluorocarbon are liquids (the exception being
perfluorocyclohexane, which sublimes at 51 C.
� Liquid breathing
� Eye surgery
� Imaging
� Artificial blood
� Decompression sickness
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Partial Liquid
Ventilation
5/19/2011 77 Relevance
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Surface Tension lowered Surface Tension lowered
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Aggressive search for and treatment of
Infectious complications is necessary
Appropriate time window for corticosteroid
administration between early acute injury
and established post aggressive fibrosis .
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