Performance of ventilators at simulated altitude: study of FiO2
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![Page 1: Performance of ventilators at simulated altitude: study of FiO2](https://reader036.fdocuments.us/reader036/viewer/2022062421/56812ad5550346895d8eb8ea/html5/thumbnails/1.jpg)
Performance of ventilators at simulated altitude:
study of FiO2
Jean-Pierre Tourtier , Thomas Leclerc, Marc Borne
Military hospital Val-de-Grâce, Paris, France
Servicede Santédes Armées
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Introduction (1):
Aero medical evacuation: ventilatory support
Ventilators: turbine technology
Hypobaric
FiO2 preset / assessed / delivered
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Introduction (2):
2 ventilators:
T-bird VS02 LTV-1000
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Methods (1):
�
Cabin altitude simulation
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Methods (2): �
Altitude simulated:
1500 m (4000 feet)
2500 m (6700 feet)
3000 m (3000 feet)
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Methods (3): �
Lung simulation: VT1 Bioteck
Normal lung:(resistance : 5.6 cm H2O/L/min ; compliance : 50 ml/cm H2O)
Acute Respiratory Distress Syndrom:(resistance : 3.9 cm H2O/L/min ; compliance : 20 ml/cm H2O)
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Methods (4): �
Ventilation parameters:
Lung model Normal lung ARDS
Vt set (ml) 700, 400 400, 250
Respiratory rate 12 20
I/E 1/2 1/1
Fi02 (%) 21,50,90 21, 50, 90
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Methods (5): �
Measurements: Actual FiO2
paramagnetic analysis
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Methods (6):paramagnetic analysis
focused magnetic field Oxygen is attracted electric potential
« gold standard »
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Results (1): Normal lung, ARDS: T-bird VS02
Cabin Altitude
(m)
90 1500 2500 3000
FiO2set
50
50
50
50
Fi02assessed
48
43
55
50
FiO2delivered
49
53
57
61
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Results (2): Normal lung, ARDS: T-bird VS02
Cabin Altitude
(m)
90 1500 2500 3000
FiO2set
90
90
90
90
Fi02assessed
87
76
94
84
FiO2delivered
88
96
99
99
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Results (3): Normal lung, ARDS: LTV-1000
Cabin Altitude
(m)
90 1500 2500 3000 3000ARDS
Vt 450 ml
FiO2set
50 50
50
50
50
Fi02assessed
49
49
50
50
53
FiO2delivered
50
51
53
54
50
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Results (4): Normal lung, ARDS: LTV-1000
Cabin Altitude
(m)
90 1500 2500 3000 3000ARDS
Vt 450 ml
FiO2set
90
90
90
90 90
Fi02assessed
87
76
88
92 92
FiO2delivered
88
96
94
95
90
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Results (5): exampleNormal lung, FiO2 set=50%
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Conclusion (1): T-bird VS02
�
Variations between FiO2 set and delivered: high
Variations between FiO2 delivered and assessed: high
Inefficacity of ventilators Fi02 analysis
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Conclusion (2): LTV-1000
�
Variations between FiO2 set and delivered: moderate
Variations between FiO2 delivered and assessed: high
Inefficacity of ventilators Fi02 analysis
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Conclusion (3): OXYMAN
�