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Exhaled breath temperature as a tool for monitoring asthma control after an attack in children

 In Suk Sol  ;  Yoon Hee Kim  ;  Soo Yeon Kim  ;  Sun Ha Choi  ;  Hye Ran Kim  ;  Kyung Won Kim  ;  Myung Hyun Sohn 
 PEDIATRIC PULMONOLOGY, Vol.54(3) : 230-236, 2019 
Journal Title
Issue Date
asthma attack ; children ; exhaled breath temperature ; peak expiratory flow rate
BACKGROUND: Exhaled breath temperature (EBT) has been suggested as a non-invasive marker of airway inflammation in asthma. There have been no studies examining longitudinal changes in EBT following asthma attacks.

OBJECTIVE: To investigate changes in EBT during and after an asthma attack and to relate these changes to changes in respiratory physiological measurements.

METHODS: We evaluated 38 hospitalized children aged 5-18 years diagnosed with an asthma attack. Spirometry was performed upon hospitalization. During hospitalization, EBT, peak expiratory flow rate (PEFR), and asthma score were measured daily. These tests were repeated 1 week and 1 month after discharge. The overall PEFR change, temporal changes in plateau values at the end of expiration, and time-dynamic associations were evaluated using linear mixed models.

RESULTS: FEV1 was lower at admission than at discharge (63.3 ± 24 vs 99.5 ± 14 percent of predicted, P < 0.001). The EBT was higher at admission than at 1 week after discharge (34.1°C [range: 33.9-34.8°C] vs 33.6°C [range: 33.0-34.2°C], P = 0.007); overall, EBTs decreased over time (P = 0.007). Among individual subjects, decreased EBT was correlated with increased PEFR over time. Furthermore, plateau values at the end of expiration had a time-dependent, dynamic association with the PEFR during hospitalization (P = 0.005) and between asthma attack onset and asthma status stabilization (P = 0.032).

CONCLUSIONS: The EBT was elevated during asthma attacks and gradually decreased until asthma was well controlled. The EBT may be a useful, non-invasive tool for monitoring asthma control in children.
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Appears in Collections:
6. Others (기타) > Severance Hospital (세브란스병원) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Pediatrics (소아과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Won(김경원) ORCID logo https://orcid.org/0000-0003-4529-6135
Kim, Soo Yeon(김수연) ORCID logo https://orcid.org/0000-0003-4965-6193
Kim, Yoon Hee(김윤희) ORCID logo https://orcid.org/0000-0002-2149-8501
Kim, Hye Ran(김혜란)
Sol, In Suk(설인숙) ORCID logo https://orcid.org/0000-0003-2470-9682
Sohn, Myung Hyun(손명현) ORCID logo https://orcid.org/0000-0002-2478-487X
Choi, Sun Ha(최선하)
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