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Byung Yun Song 1 Article
Analysis of ROX Index, ROX-HR Index, and SpO 2 /FIO 2 Ratio in Patients Who Received HighFlow Nasal Cannula Oxygen Therapy in Pediatric Intensive Care Unit
Sun Hee Choi, Dong Yeon Kim, Byung Yun Song, Yang Sook Yoo
J Korean Acad Nurs 2023;53(4):468-479.   Published online August 31, 2023
DOI: https://doi.org/10.4040/jkan.22152
AbstractAbstract PDF
Purpose
This study aimed to evaluate the use of the respiratory rate oxygenation (ROX) index, ROX-heart rate (ROX-HR) index, and saturation of percutaneous oxygen/fraction of inspired oxygen ratio (SF ratio) to predict weaning from high-flow nasal cannula (HFNC) in patients with respiratory distress in a pediatric intensive care unit.
Methods
A total of 107 children admitted to the pediatric intensive care unit were enrolled in the study between January 1, 2017, and December 31, 2021. Data on clinical and personal information, ROX index, ROX-HR index, and SF ratio were collected from nursing records. The data were analyzed using an independent t-test, χ2 test, Mann–Whitney U test, and area under the curve (AUC).
Results
Seventy-five (70.1%) patients were successfully weaned from HFNC, while 32 (29.9%) failed. Considering specificity and sensitivity, the optimal cut off points for predicting treatment success and failure of HFNC oxygen therapy were 6.88 and 10.16 (ROX index), 5.23 and 8.61 (ROX-HR index), and 198.75 and 353.15 (SF ratio), respectively. The measurement of time showed that the most significant AUC was 1 hour before HFNC interruption.
Conclusion
The ROX index, ROX-HR index, and SF ratio appear to be promising tools for the early prediction of treatment success or failure in patients initiated on HFNC for acute hypoxemic respiratory failure. Nurses caring for critically ill pediatric patients should closely observe and periodically check their breathing patterns. It is important to continuously monitor three indexes to ensure that ventilation assistance therapy is started at the right time.

Citations

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  • Non-invasive SpO2/FiO2 ratio (SFR) as surrogate for PaO2/FiO2 ratio (PFR): A scoping review
    Madhura Reddy, Malavika Kulkarni, Sushma Thimmaiah Kanakalakshmi, Laxmi Shenoy, Rama Rani KrishnaBhat
    The Journal of Critical Care Medicine.2025; 11(3): 221.     CrossRef
  • Can the ROX index predict high‐flow nasal cannula failure in children under 2 with lower respiratory tract infection?
    Pablo Vasquez‐Hoyos, Alvaro L. Jacome‐Orozco, Andrea P. Rodriguez‐Mayorga, Leidy E. Sepulveda‐Forero, Diana P. Escobar‐Serna, Juan S. Barajas, Evelyn Obando‐Belalcazar, Claudia M. Salinas‐Jaimes, Juan J. Peralta‐Palmezano, Alexandra Jimenez‐Chavez, Rafael
    Pediatric Pulmonology.2024; 59(5): 1246.     CrossRef
  • Impact of Surgical Mask Placement Over High-Flow Nasal Cannula on Oxygenation Parameters in COVID-19 Patients Experiencing Hypoxemic Respiratory Failure
    Aadila Coatwala, Mayank Dhir, Sagar Sinha, Dattatray Bhusare
    Cureus.2024;[Epub]     CrossRef
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