Thermodiluted relative tidal volume estimation using a thermal camera in operating room under spinal anesthesia

Estimating relative tidal volume is an important factor when monitoring breathing status. The relationship between temperature and respiration volume has rarely been studied. In this paper, a formula was derived for calculating thermodiluted respiration volume from temperature changes in the nasal c...

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Bibliographic Details
Published in:Biomedical engineering online 2022-09, Vol.21 (1), p.1-64, Article 64
Main Authors: Kwon, JunHwan, Kwon, Oyun, Oh, KyeongTeak, Kim, Jeongmin, Shin, Cheung Soo, Yoo, Sun K
Format: Article
Language:English
Subjects:
Anesthesia
Cameras
Estimation
Health aspects
Heat detection
Infections
Measurement
Methods
Nasal fossa
Non-contact
Nose
Observations
Oxygen saturation
Physiological aspects
Pulse oximetry
Regression analysis
Regression coefficients
Respiration
Standard deviation
Thermal camera
Thermal energy
Thermodynamics
Tidal volume
Trends
Wavelet transforms
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Summary:Estimating relative tidal volume is an important factor when monitoring breathing status. The relationship between temperature and respiration volume has rarely been studied. In this paper, a formula was derived for calculating thermodiluted respiration volume from temperature changes in the nasal cavity. To evaluate the proposed formula, the study compared the relative tidal volume estimated by the proposed formula with that recorded by a respiration volume monitor (Exspiron1Xi, RVM). Thermal data were obtained for 8 cases at a rate of 10 measurements per second. Simultaneous recordings by the RVM are regarded as the reference. The mean of ICC coefficient is 0.948 [+ or -] 0.030, RMSE is 0.1026 [+ or -] 0.0284, R-squared value is 0.8962 [+ or -] 0.065 and linear regression coefficient [formula omitted] is 0.966 [+ or -] 0.104, [formula omitted] is 0.042 [+ or -] 0.057. Bland-Altman plot showed 96.01% of samples that the difference between the measured and estimated values exists within 2 standard deviations. In this paper, a model that can thermodynamically calculate the relationship between thermal energy and respiration volume is proposed. The thermodiluted model is a feasible method for estimating relative respiration tidal volumes.
ISSN:1475-925X
1475-925X
DOI:10.1186/s12938-022-01028-0