Performance of an active inspired hypoxic guard

Current hypoxic guards systems fail to maintain the inspired O 2 concentration (F I O 2 ) ≥ 21 % across the entire fresh gas flow (FGF) range when a second carrier gas is used (N 2 O or air). We examined the performance of the Maquet O 2 Guard ® , a smart hypoxic guard that increases O 2 delivery if...

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Bibliographic Details
Published in:Journal of clinical monitoring and computing 2016-02, Vol.30 (1), p.63-68
Main Authors: Ghijselings, Idris E., De Cooman, Sofie, Carette, Rik, Peyton, Philip J., De Wolf, Andre M., Hendrickx, Jan F. A.
Format: Article
Language:English
Subjects:
Activation
Adult
Aged
Aged, 80 and over
Anesthesia, Inhalation - instrumentation
Anesthesia, Inhalation - methods
Anesthesiology
Anesthetics, Inhalation - administration & dosage
Carriers
Clinical Alarms
Critical Care Medicine
Equipment Design
Equipment Failure Analysis
Female
Gas flow
Guards
Health Sciences
Humans
Hypoxia - prevention & control
Informed consent
Intensive
Male
Medicine
Medicine & Public Health
Middle Aged
Monitoring
Monitoring, Intraoperative - instrumentation
Monitoring, Intraoperative - methods
Nitrous Oxide - administration & dosage
Nitrous Oxide - analysis
Nitrous oxides
Original Research
Oxygen - administration & dosage
Patients
Reproducibility of Results
Sensitivity and Specificity
Statistics for Life Sciences
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Summary:Current hypoxic guards systems fail to maintain the inspired O 2 concentration (F I O 2 ) ≥ 21 % across the entire fresh gas flow (FGF) range when a second carrier gas is used (N 2 O or air). We examined the performance of the Maquet O 2 Guard ® , a smart hypoxic guard that increases O 2 delivery if an inspired hypoxic mixture is formed. After obtaining IRB approval and informed consent, 12 ASA I-II patients were enrolled. During anesthesia with sevoflurane in O 2 /air, the O 2 Guard ® was tested by administering O 2 /air at the following delivered hypoxic guard limits [expressed as (total FGF in L min −1 ; F D O 2 in %)] for 4 min each: [0.3;67], [0.4;50], [0.6;34], [0.8;25], [1.0;21], [1.2;21], [1.5;21], [2;21], [3;21], and [5;21]. The following data were collected: (1) time from F I O 2  = 30 to 20 %; (2) time from F I O 2  = 20 % to O 2 Guard ® activation; (3) time from O 2 Guard ® activation to F I O 2  = 25 %; (4) FGF and F D O 2 used by the O 2 Guard. If SpO 2 was
ISSN:1387-1307
1573-2614
DOI:10.1007/s10877-015-9684-9