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CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2021; 31(S 01): S61-S69
DOI: 10.4103/ijri.IJRI_965_20
Original Article

The value of AI based CT severity scoring system in triage of patients with Covid-19 pneumonia as regards oxygen requirement and place of admission

Anirudh Kohli
Departments of Imaging and Critical Care, Breach Candy Hospital Trust, Breach Candy, Cumballa Hill, Mumbai, Maharashtra, India
,
Tanya Jha
Departments of Critical Care, Breach Candy Hospital Trust, Breach Candy, Cumballa Hill, Mumbai, Maharashtra, India
,
Amal Babu Pazhayattil
Departments of Imaging and Critical Care, Breach Candy Hospital Trust, Breach Candy, Cumballa Hill, Mumbai, Maharashtra, India
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Abstract

Context: CT scan is a quick and effective method to triage patients in the Covid-19 pandemic to prevent the heathcare facilities from getting overwhelmed. Aims: To find whether an initial HRCT chest can help triage patient by determining their oxygen requirement, place of treatment, laboratory parameters and risk of mortality and to compare 3 CT scoring systems (0-20, 0-25 and percentage of involved lung models) to find if one is a better predictor of prognosis than the other. Settings and Design: This was a prospective observational study conducted at a Tertiary care hospital in Mumbai, Patients undergoing CT scan were included by complete enumeration method. Methods and Material: Data collected included demographics, days from swab positivity to CT scan, comorbidities, place of treatment, laboratory parameters, oxygen requirement and mortality. We divided the patients into mild, moderate and severe based on 3 criteria - 20 point CT score (OS1), 25 point CT score (OS2) and opacity percentage (OP). CT scans were analysed using CT pneumonia analysis prototype software (Siemens Healthcare version 2.5.2, Erlangen, Germany). Statistical Analysis: ROC curve and Youden’s index were used to determine cut off points. Multinomial logistic regression used to study the relations with oxygen requirement and place of admission. Hosmer-Lemeshow test was done to test the goodness of fit of our models. Results: A total of 740 patients were included in our study. All the 3 scoring systems showed a significant positive correlation with oxygen requirement, place of admission and death. Based on ROC analysis a score of 4 for OS1, 9 for OS2 and 12.7% for OP was determined as the cut off for oxygen requirement. Conclusions: CT severity scoring using an automated deep learning software programme is a boon for determining oxygen requirement and triage. As the score increases, the chances of requirement of higher oxygen and intubation increase. All the three scoring systems are predictive of oxygen requirement.

Keywords

Covid-19 - HRCT chest - oxygen requirement


Publication History

Received: 24 December 2020

Accepted: 05 January 2021

Article published online:
13 July 2021

© 2021. Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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