ABSTRACT

Background: The arterial oxygen tension (PaO,) is the main indicator of oxygenation in the arterial blood, a diminishment on it would let us establish the diagnosis of hypoxemic respiratory failure (RF). However, there are other indicators, as the PaO/IOT ratio.
Objective: To establish if there is a dependency and relation between the determinations PaO2 and oxygenation tissular index (OTI).
Material and methods: A transversal observational and retrospective research was held among 48 patients that attended the lung physiology of the Hospital Universitario de Puebla without any remark on age or sex to whom it was determined through arterial gasometry with a FiO2 of 0.21 the variables PaO2and OTI.
Results: The relationship and dependency among the variables were determined with the test of linear regression with the following results: a: 2.8 and b: 4.72. The determination coefficient of Sperman r: 0.966; the correlation coefficient of Pearson r: 0.98; t Student: 36.046; V.C.: 2.014; p = 0.975; p < 0.025.
Conclusions: After the statistical treatment it was determined that there is a statistical relevant relation and dependency (p < 0.025) showing a direct relationship when results were recorded, therefore the reduction of PaO2 is directly proportional to the diminution of OTI. The incline calculated of 4.77 is a factor that multiplied by the value of PaO2 in this series would allow us to calculate approximately the value of OTI in the atmosphere in the city of Puebla.

KEYWORDS

oxygenation tissular index (OTI), PaO₂/OTI ratio, hypoxemic respiratory failure (RF).

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