Use of the PaO2/FiO2 Ratio in Pulmonary Embolism: Evaluation of its Correlation with Pulmonary Arterial Computed Tomography Obstruction Index

Rationale and Objectives: The pulmonary arterial computed tomography obstruction index ratio (PACTOIR) is a parameter that provides an idea of the clinical severity of acute pulmonary embolism (APE). This study aimed to examine the correlation between the PaO2 /FiO2 ratio and PACTOIR in patients who presented to the emergency department and received a preliminary diagnosis of APE.Materials and Methods: This study was conducted prospectively in the emergency department. The patients' sociodemographic charac-teristics, vital signs, PACTOIR, and PaO2 /FiO2 ratio were obtained. The correlation between PACTOIR and PaO2 /FiO2 ratio was then statistically evaluated.Results: The study included 50 patients, of whom 31 (62%) were women, and 19(38%) were men. The female patients had a PaO2 /FiO2 ratio of 209 +/- 67 and PACTOIR of 36.3 +/- 15.5. The male patients had a PaO2 /FiO2 ratio of 169 +/- 43 and PACTOIR of 39.7 +/- 19. The PaO2 /FiO2 ratio of the patients with APE was negatively correlated with the PACTOIR value at a statistically significant level (r = -0.308, p = 0.031). The regression equation was as follows: PACTOIR = (-0.0869) x (PaO2 / FiO2) + (54.489).Conclusion: By calculating the PaO2 /FiO2 ratio in patients with APE, the degree of pulmonary artery obstruction and clinical severity can be predicted. Therefore, the ratio PaO2 /FiO2 can be used instead of PACTOIR.Key Words: PaO2 /FiO2 Acute pulmonary embolism; Pulmonary arterial computed tomography obstruction index ratio; Partial oxygen pressure; PaO2 /FiO2 ratio.(c) 2022 The Association of University Radiologists. Published by Elsevier Inc. All rights reserved.

Dergi

ACADEMIC RADIOLOGY

Yıl

2023

Cilt

30

Sayı

5

Sayfa

893-899

ISSN

1076-6332

eISSN

1878-4046

DOI

10.1016/j.acra.2022.06.004

WoS UID

WOS:000982255100001