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 characteristics, 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
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Article info
Publication history
Published online: July 05, 2022
Accepted:
June 6,
2022
Received in revised form:
June 5,
2022
Received:
April 21,
2022
Footnotes
Funding: None.
Identification
Copyright
© 2022 The Association of University Radiologists. Published by Elsevier Inc. All rights reserved.
