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• W4387241352 abstract "ABSTRACTDisrupted circadian temperature rhythm is commonly observed in elderly patients in the intensive care unit (ICU), but the association between circadian temperature rhythm and mortality in elderly patients is unclear. Adult patients with a relatively complete record of body temperature (BT) during the first 24 hours of ICU stay in the Multi-parameter Intelligent Monitoring in Intensive Care IV (MIMIC-IV) database were included in this retrospective cohort study. The circadian rhythm of body temperature was blunted as a ratio of the maximum BT between 12:00 and 24:00 divided by the minimum BT between 0:00 and 12:00, and we defined it as BT fluctuation ratio. The associations of BT fluctuation ratio with 28-day mortality were assessed separately using Cox proportional hazards model in elderly patients and non-elderly patients. The overall cohort comprised 12 767 patients. After adjusting for covariates, the analysis showed that the BT fluctuation ratio (%) was significantly associated with mortality at 28 days in total patients (hazard ratio: 1.044; 95% CI 1.001–1.088; P = 0.042), and still significantly in elderly patients (hazard ratio 1.055, 95% CI as 1.004–1.109, p = 0.035), but not significantly in non-elderly patients. The implementation of restricted cubic splines demonstrated a nonlinear correlation between the ratio of BT fluctuation and the hazard ratio of 28-day mortality, indicating that increased diurnal temperature fluctuations are linked to elevated risk of mortality. This study revealed that the augmented amplitude of the circadian rhythm of body temperature in the elderly patients constitutes a risk factor for the rise of 28-day mortality. Additionally, the circadian body temperature rhythm may facilitate the early detection of critically ill elderly patients.KEYWORDS: Body temperaturecircadian rhythmintensive caremortalityMulti-parameter Intelligent Monitoring in Intensive Care IV Author contributionsJ.F. takes responsibility for the content of the manuscript, including the data and analysis. W.L., J.F., X.Y., and H.D. contributed to the study design. H.D., X.Y. and Y.L. contributed to data collection. H.D., and X.Y. performed statistical analysis and interpretation and drafted the manuscript. X.Y. revised the manuscript. All authors contributed to critical revision of the manuscript and approved its final version. Financial support and study supervision were provided by W.L. and J.F.Disclosure statementNo potential conflict of interest was reported by the author(s).Supplementary dataSupplemental data for this article can be accessed online at https://doi.org/10.1080/07420528.2023.2259994.Additional informationFundingThis study was supported by the National Natural Science Foundation of China [No. 81870441]. The sponsor had no role in the design of the study, the collection and analysis of the data, or the preparation of the manuscript." @default.
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• W4387241352 date "2023-09-02" @default.
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• W4387241352 title "Association between circadian body temperature rhythm during the first 24 hours of ICU stay and 28-day mortality in elderly critically ill patients: A retrospective cohort study" @default.
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• W4387241352 doi "https://doi.org/10.1080/07420528.2023.2259994" @default.
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