Abstract
The use of the ROX index in COVID 19 patients allows evaluating those with high risk of ventilatory failure...
Highlights
The use of the ratio of the oxygen saturation index (ROX) index in COVID 19 patients allows evaluating those with high risk of ventilatory failure, it has not been openly validated in patients using non-rebreathing mask
At 12 h the values were higher in the group of survivors 7.8 (5.2 - 8.7) in relation to the deceased (4.9 (3.8 - 6.0). by age and gender, the ROX index was 8.5 at 2 h, CI 2.0 - 91.4) and at 12 h was 17.6, CI 2.8 - 93.6. 70 years doubles those under 60 years of age as well as there is a correlation between the older age group and lower ROX indices
The present study showed an adequate correlation between the ROX index, and those patients admitted to intensive care showing higher mortality in those older than 70 years and higher comorbidities index and lower ROX index compared to the other age groups
Summary
The use of the ROX index in COVID 19 patients allows evaluating those with high risk of ventilatory failure, it has not been openly validated in patients using non-rebreathing mask. The costs of the system such as HFNC as well as CPAP and the low availability of this in health institutions in developing countries make it necessary to consider the use of other devices such as the non-rebreathing mask in patients who have hypoxemia refractory to low-flow systems. There are few published data that describe the use of the ROX index to guide the use of HFNC to treat respiratory failure associated with COVID-19, and there are fewer studies where the system known as the nonrebreathing mask is used; The ROX index was developed as a simple bedside test to predict HFNC failure and the need for MV, it is likely that patients with viral pneumonia were underrepresented in referral and validation studies [8,9]
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