Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase

Background Patients with severe coronavirus disease 2019 (COVID-19) have been reported to show hypoxia without displaying typical clinical signs or symptoms, called “happy hypoxia.” To explore the potential of happy hypoxia as a distinctive symptom of COVID-19, we compared vital signs in the triage...

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Main Authors: Mihiro Kaga, Masanao Sasaki, Takahiro Masuda, Hiroyuki Sato, Takeshi Ueda, Akihiro Hirakawa
Format: Article
Language:English
Published: Taylor & Francis Group 2025-12-01
Series:Future Science OA
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Online Access:https://www.tandfonline.com/doi/10.1080/20565623.2025.2458413
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author Mihiro Kaga
Masanao Sasaki
Takahiro Masuda
Hiroyuki Sato
Takeshi Ueda
Akihiro Hirakawa
author_facet Mihiro Kaga
Masanao Sasaki
Takahiro Masuda
Hiroyuki Sato
Takeshi Ueda
Akihiro Hirakawa
author_sort Mihiro Kaga
collection DOAJ
description Background Patients with severe coronavirus disease 2019 (COVID-19) have been reported to show hypoxia without displaying typical clinical signs or symptoms, called “happy hypoxia.” To explore the potential of happy hypoxia as a distinctive symptom of COVID-19, we compared vital signs in the triage phase between patients with and without COVID-19.Methods We retrospectively identified emergency patients with and without COVID-19 admitted to Rakuwakai Marutamachi Hospital, Kyoto, Japan, between January 2021 and December 2021.Results and Conclusions 317 patients were analyzed. Multivariate logistic regression analysis, including all vital signs, demonstrated that the respiratory rate was not statistically associated with COVID-19 (odds ratio, 0.94, p = 0.058), suggesting that happy hypoxia may not be a distinct hallmark of COVID-19.
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spelling doaj-art-275cf9d67d4e476babda091b3eeb22f62025-01-30T13:37:53ZengTaylor & Francis GroupFuture Science OA2056-56232025-12-0111110.1080/20565623.2025.2458413Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phaseMihiro Kaga0Masanao Sasaki1Takahiro Masuda2Hiroyuki Sato3Takeshi Ueda4Akihiro Hirakawa5Department of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JapanDepartment of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JapanDepartment of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JapanDepartment of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JapanEmergency and General Internal Medicine, Rakuwakai Marutamachi Hospital, Kyoto, JapanDepartment of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JapanBackground Patients with severe coronavirus disease 2019 (COVID-19) have been reported to show hypoxia without displaying typical clinical signs or symptoms, called “happy hypoxia.” To explore the potential of happy hypoxia as a distinctive symptom of COVID-19, we compared vital signs in the triage phase between patients with and without COVID-19.Methods We retrospectively identified emergency patients with and without COVID-19 admitted to Rakuwakai Marutamachi Hospital, Kyoto, Japan, between January 2021 and December 2021.Results and Conclusions 317 patients were analyzed. Multivariate logistic regression analysis, including all vital signs, demonstrated that the respiratory rate was not statistically associated with COVID-19 (odds ratio, 0.94, p = 0.058), suggesting that happy hypoxia may not be a distinct hallmark of COVID-19.https://www.tandfonline.com/doi/10.1080/20565623.2025.2458413COVID-19hypoxiarespiratory ratetriagevital signs
spellingShingle Mihiro Kaga
Masanao Sasaki
Takahiro Masuda
Hiroyuki Sato
Takeshi Ueda
Akihiro Hirakawa
Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
Future Science OA
COVID-19
hypoxia
respiratory rate
triage
vital signs
title Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
title_full Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
title_fullStr Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
title_full_unstemmed Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
title_short Exploring the association between happy hypoxia and Coronavirus disease 2019 in the triage phase
title_sort exploring the association between happy hypoxia and coronavirus disease 2019 in the triage phase
topic COVID-19
hypoxia
respiratory rate
triage
vital signs
url https://www.tandfonline.com/doi/10.1080/20565623.2025.2458413
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