Research Article

J Sci Discov (2020); 4(2):jsd20018; DOI:10.24262/jsd.4.2.20018; 
Received June 02rd, 2020,Revised July 18th, 2020, Accepted July 31st, 2020, Published August 12rd, 2020.

Estimation of Oxygen Pressure in Arterial Blood from Pulse Oximetry: A Useful Out-of-hospital Tool

Manuel Piñero-Zapata^{1, 3}_，Alejandro Piñero-Garcia²_，Amelia Margarita Canovas-Miralles³_，Maria Eva Legaz-Moreno³

¹Nursing Faculty. San Antonio Catholic University of Murcia. Spain.

²Higher school of telecommunications. Polytechnic University of Cartagena. Cartagena. Spain.

³Mobile Emergencies Unit. Gerencia de Urgencias y Emergencias 061. Servicio Murciano de Salud. Murcia. Spain.

* Correspondence: Manuel Piñero-Zapata,Nursing Faculty. San Antonio Catholic University of Murcia. Spain..E-mail:manuelpinerozapata@gmail.com

Background In out-of-hospital emergency, there are obvious limitations for therapeutic decision-making due to the lack of complementary tests that are available in the hospital environment, including the value of arterial oxygen pressure (PaO₂) using arterial blood gas as It helps in assessing the severity of patients with Acute Respiratory Failure.

Methods Obtain PaO₂ equivalency values from integer SaO₂ values on the measurement scale between 1% and 100%, and set the SaO₂/FiO₂ intervals associated with severity levels in acute respiratory failure (ARF) hypoxemic. Mathematical analysis by inversion of the function of the Hemoglobin Dissociation Curve at physiological values of pH=7.4 and Tª=37°C, to obtain the equivalent values of PO₂ in arterial blood from integer values of SpO₂ obtained by pulse oximetry.

Results A correspondence table was obtained between SaO₂ and PaO₂ as well as the SaO2/FiO2 intervals equivalent to those of PaO₂/FiO₂ according to severity levels in patients with hypoxemic ARF with FiO₂=21%.

Conclusions SpO₂, in the absence of PaO₂, is useful in establishing the severity of patients with hypoxemic ARF in emergency situations.

Keywords: Transcutaneous Oximetry; Respiratory Insufficiency; Emergencies

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