Abstract Oxygen reserve index (ORI) is a novel dimensionless index used for noninvasive, real-time, and continuous monitoring of oxygenation, and ORI value ranges from 0 to 1, which reflects the range of 100-200 mmHg for arterial partial pressure of oxygen. ORI combined with pulse oximetry may help to accurately adjust the concentration of inspired oxygen and prevent hyperoxemia and hypoxemia. ORI is suitable for various clinical situations, and the medical staff should master this novel parameter and use it properly to assess the oxygenation of patients. In addition, several limitations of ORI should be noticed during clinical application.
Fleming NW, Singh A, Lee L, et al. Oxygen reserve index: utility as an early warning for desaturation in high-risk surgical patients[J]. Anesth Analg, 2021, 132(3): 770-776. PMID: 32815872. DOI: 10.1213/ANE.0000000000005109.
Umeda A, Ishizaka M, Tasaki M, et al. Evaluation of time courses of agreement between minutely obtained transcutaneous blood gas data and the gold standard arterial data from spontaneously breathing Asian adults, and various subgroup analyses[J]. BMC Pulm Med, 2020, 20(1): 151. PMID: 32471394. PMCID: PMC7257137. DOI: 10.1186/s12890-020-01184-w.
Szmuk P, Steiner JW, Olomu PN, et al. Oxygen reserve index: a novel noninvasive measure of oxygen reserve—a pilot study[J]. Anesthesiology, 2016, 124(4): 779-784. PMID: 26978143. DOI: 10.1097/ALN.0000000000001009.
Yoshida K, Isosu T, Noji Y, et al. Adjustment of oxygen reserve index (ORiTM) to avoid excessive hyperoxia during general anesthesia[J]. J Clin Monit Comput, 2020, 34(3): 509-514. PMID: 31227971. DOI: 10.1007/s10877-019-00341-9.
Yoshida K, Isosu T, Noji Y, et al. Usefulness of oxygen reserve index (ORiTM), a new parameter of oxygenation reserve potential, for rapid sequence induction of general anesthesia[J]. J Clin Monit Comput, 2018, 32(4): 687-691. PMID: 28956237. DOI: 10.1007/s10877-017-0068-1.
Koishi W, Kumagai M, Ogawa S, et al. Monitoring the oxygen reserve index can contribute to the early detection of deterioration in blood oxygenation during one-lung ventilation[J]. Minerva Anestesiol, 2018, 84(9): 1063-1069. PMID: 29756744. DOI: 10.23736/S0375-9393.18.12622-8.
Alday E, Nieves JM, Planas A. Oxygen reserve index predicts hypoxemia during one-lung ventilation: an observational diagnostic study[J]. J Cardiothorac Vasc Anesth, 2020, 34(2): 417-422. PMID: 31362907. DOI: 10.1053/j.jvca.2019.06.035.
Yoshida K, Isosu T, Imaizumi T, et al. Oxygen reserve index (ORiTM) as an alarm for oxygenation deterioration in pediatric tracheostomaplasty: a case report[J]. Paediatr Anaesth, 2019, 29(11): 1151-1153. PMID: 31677336. DOI: 10.1111/pan.13739.
Niwa Y, Shiba J, Fujita H, et al. Oxygen reserve index (ORiTM) contributes to prediction of hypoxemia and patient safety during tracheal stent insertion using rigid bronchoscopy: a case report[J]. J Clin Monit Comput, 2019, 33(6): 1011-1014. PMID: 30519896. DOI: 10.1007/s10877-018-0232-2.
Lo YC, Chen KY, Chou HC, et al. Neonatal hyperoxia induces gut dysbiosis and behavioral changes in adolescent mice[J]. J Chin Med Assoc, 2021, 84(3): 290-298. PMID: 33496514. DOI: 10.1097/JCMA.0000000000000488.
You J, Fan X, Bi X, et al. Association between arterial hyperoxia and mortality in critically ill patients: a systematic review and meta-analysis[J]. J Crit Care, 2018, 47: 260-268. PMID: 30077082. DOI: 10.1016/j.jcrc.2018.07.014.
Helmerhorst HJ, Roos-Blom MJ, van Westerloo DJ, et al. Association between arterial hyperoxia and outcome in subsets of critical illness: a systematic review, meta-analysis, and meta-regression of cohort studies[J]. Crit Care Med, 2015, 43(7): 1508-1519. PMID: 25855899. DOI: 10.1097/CCM.0000000000000998.
Helmerhorst HJ, Arts DL, Schultz MJ, et al. Metrics of arterial hyperoxia and associated outcomes in critical care[J]. Crit Care Med, 2017, 45(2): 187-195. PMID: 27763912. DOI: 10.1097/CCM.0000000000002084.
Ray S, Kulkarni KS, Dave NM, et al. The utility of the oxygen reserve indexTM in a neonate undergoing re-exploration of a tracheoesophageal fistula[J]. Indian J Anaesth, 2018, 62(3): 233-234. PMID: 29643560. PMCID: PMC5881328. DOI: 10.4103/ija.IJA_778_17.
Shah U, Wong J, Wong DT, et al. Preoxygenation and intraoperative ventilation strategies in obese patients: a comprehensive review[J]. Curr Opin Anaesthesiol, 2016, 29(1): 109-118. PMID: 26545146. DOI: 10.1097/ACO.0000000000000267.
Mosier JM, Hypes CD, Sakles JC. Understanding preoxygenation and apneic oxygenation during intubation in the critically ill[J]. Intensive Care Med, 2017, 43(2): 226-228. PMID: 27342820. DOI: 10.1007/s00134-016-4426-0.
Askie LM, Darlow BA, Finer N, et al. Association between oxygen saturation targeting and death or disability in extremely preterm infants in the Neonatal Oxygenation Prospective Meta-analysis Collaboration[J]. JAMA, 2018, 319(21): 2190-2201. PMID: 29872859. PMCID: PMC6583054. DOI: 10.1001/jama.2018.5725.
Bachman TE, Newth CJL, Iyer NP, et al. Hypoxemic and hyperoxemic likelihood in pulse oximetry ranges: NICU observational study[J]. Arch Dis Child Fetal Neonatal Ed, 2019, 104(3): F274-F279. PMID: 29925540. DOI: 10.1136/archdischild-2017-314448.
Isosu T, Yoshida K, Oishi R, et al. Effects of indigo carmine intravenous injection on oxygen reserve index (ORiTM) measurement[J]. J Clin Monit Comput, 2018, 32(4): 693-697. PMID: 28975476. DOI: 10.1007/s10877-017-0064-5.
Kondo H, Nakamura R, Kobatake A, et al. Effects of intravenous injection of indocyanine green on the oxygen reserve index (ORiTM)[J]. J Anesth, 2020, 34(3): 338-341. PMID: 32078044. DOI: 10.1007/s00540-020-02746-2.