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Oxygen Reserve Index and Arterial Partial Pressure of Oxygen: Relationship in Open Heart Surgery

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Abstract

Background: Mild to moderate hyperoxia is potentially beneficial to patients undergoing open heart surgery. Oxygen Reserve Index (ORI) is a novel parameter that correlates to arterial oxygen tension (PaO2) in the hyperoxic range. This prospective study aimed to assess whether the relationship between ORI and PaO2 remains intact in the setting of open-heart surgery. Methods: This study included patients undergoing valve, aortic arch and coronary artery bypass grafting (CABG) surgeries, on and off pump, between September 1st 2019 and August 31st 2021. Enrolled patients had arterial blood gas samples collected and analyzed after induction of anesthesia and increases in FiO2 in steps of 0.08 with ORI being recorded at the time of sample collection for cross reference and analysis. Results: ORI values showed a statistically significant correlation with PaO2 values in the 100–200 mmHg range (r = 0.8193, p < 0.001). Additionally, there was a significant correlation between ORI and SpO2 values in the range of 95% and 100% (r = 0.529, p < 0.05). Conclusions: The preserved relationship between ORI and PaO2 in the mild and moderate hyperoxic range can allow more precise titration of oxygen therapy to guide therapy targeting normoxia, mildly and moderately hyperoxia. Additionally, it could have a potential use as an early warning system for impeding hypoxia.

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Authors and Affiliations

  1. Al-Babtain Cardiac Center, Dammam, Saudi Arabia

    Mustafa E. Fadel, Hossam E. Walley & Hatem Al Taher

  2. Anesthesiology Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates

    Majid O. Shangab & Francisco A Lobo

Authors
  1. Mustafa E. Fadel
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  2. Majid O. Shangab
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  3. Hossam E. Walley
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  4. Hatem Al Taher
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  5. Francisco A Lobo
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Contributions

Drs. M. F., H. W., and H. A. designed the trial and collected the data, Drs. M. S. and F. L. analyzed and interpreted the data and drafted the manuscript. All authors have read and approved the submitted manuscript.

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Correspondence to Majid O. Shangab.

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Fadel, M.E., Shangab, M., Walley, H.E. et al. Oxygen Reserve Index and Arterial Partial Pressure of Oxygen: Relationship in Open Heart Surgery. J Clin Monit Comput 37, 1435–1440 (2023). https://doi.org/10.1007/s10877-023-01001-9

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  • DOI: https://doi.org/10.1007/s10877-023-01001-9

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