Journal article
Oxygen Reserve Index A Novel Noninvasive Measure of Oxygen Reserve-A Pilot Study
Anesthesiology (Philadelphia), Vol.124(4), pp.779-784
04/2016
DOI: 10.1097/ALN.0000000000001009
PMID: 26978143
Abstract
Background: Pulse oximetry provides no indication of downward trends in Pao(2) until saturation begins to decrease. The Oxygen Reserve Index (ORI) is a novel pulse oximeter-based nondimensional index that ranges from 1 to 0 as Pao(2) decreases from about 200 to 80 mmHg and is measured by optically detecting changes in Svo(2) after Sao(2) saturates to the maximum. The authors tested the hypothesis that the ORI provides a clinically important warning of impending desaturation in pediatric patients during induction of anesthesia.
Methods: After preoxygenation, anesthesia induction, and tracheal intubation, the anesthesia circuit was disconnected and oxygen saturation was allowed to decrease to 90% before ventilation recommenced. The ORI and Spo(2) values were recorded from a Masimo Pulse Co-Oximeter Sensor at the beginning of apnea, beginning and end of intubation, beginning and end of the ORI alarm, and 2 min after reoxygenation.
Results: Data from 25 healthy children, aged 7.6 4.6 yr, were included in the analysis. During apnea, the ORI slowly and progressively decreased over a mean of 5.9 +/- 3.1 min from 0.73 +/- 0.16 at the beginning of apnea to 0.37 +/- 0.11. Spo(2) remained 100% throughout this initial period. Concurrently with alarm activation, the ORI began to decrease rapidly, and in median of 31.5 s (interquartile range, 19 to 34.3 s), saturation decreased to 98%.
Conclusions: In this pilot study, the ORI detected impending desaturation in median of 31.5 s (interquartile range, 19-34.3 s) before noticeable changes in Spo(2) occurred. This represents a clinically important warning time, which might give clinicians time for corrective actions.
Details
- Title: Subtitle
- Oxygen Reserve Index A Novel Noninvasive Measure of Oxygen Reserve-A Pilot Study
- Creators
- Peter Szmuk - Outcomes Research ConsortiumJeffrey W. Steiner - Outcomes Research ConsortiumPatrick N. Olomu - Outcomes Research ConsortiumRoxana P. Ploski - Outcomes Research ConsortiumDaniel I. Sessler - Outcomes Research ConsortiumTiberiu Ezri - Outcomes Research Consortium
- Resource Type
- Journal article
- Publication Details
- Anesthesiology (Philadelphia), Vol.124(4), pp.779-784
- Publisher
- Lippincott Williams & Wilkins
- DOI
- 10.1097/ALN.0000000000001009
- PMID
- 26978143
- ISSN
- 0003-3022
- eISSN
- 1528-1175
- Number of pages
- 6
- Grant note
- Masimo Corp, Irvine, California
- Language
- English
- Date published
- 04/2016
- Academic Unit
- Anesthesia
- Record Identifier
- 9984656594902771
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