Tidal volume via circumferences of the upper body: a pilot study

Laufer, Bernhard; Krueger-Ziolek, Sabine; Docherty, Paul; Höflinger, Fabian; Reindl, Leonhard M.; Möeller, Knut

doi:10.1109/embc.2019.8857688

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…In this study, we investigated the combined effect of patient characteristics on TV requirement during general anaesthesia. We studied five patient characteristics (age, height, weight, abdominal girth, and chest circumference) that were selected based on previous research [10][11][12][13][14][15]. The results show that four of these characteristics (height, weight, abdominal girth, and chest circumference) are related to TV requirement; weight was the most strongly correlated variable.…”

Section: Discussionmentioning

confidence: 99%

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Weight and Abdominal Girth Predict Tidal Volume Requirement During Mechanical Ventilation for General Anaesthesia: A Cross-sectional Study

Shen

Chen

Zhou

et al. 2021

Preprint

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Background: Evidence that tidal volume (TV) is related to age, height, weight, chest circumference, and abdominal girth exists. However, it is unclear which of these has the strongest association with TV. This study aimed to investigate the main factors associated with TV and determine a method for accurately predicting TV requirement during mechanical ventilation. Methods: From December 2019 to January 2021, we enrolled 133 patients who were scheduled for surgery. Their age, height, weight, abdominal girth, and chest circumference were recorded. Intraoperatively, at 30 minutes after mechanical ventilation during general anaesthesia, the TV was increased or decreased by 25 ml if the partial pressure of carbon dioxide (PaCO2) was > 45 mmHg or < 35 mmHg, respectively. This was continued until we observed two consecutive PaCO2 values between 35 and 45 mmHg. The TV setting was recorded at this point. Linear regression and multiple regression analyses were performed. Results: The data of 100 patients were analysed. Linear regression analysis showed significant univariate correlations between age, weight, height, abdominal girth, chest circumference, and TV requirement. (all P ≤ 0.049). Multiple linear regression analysis showed that weight and abdominal girth were key determinants of TV requirement (both P < 0.001). The adjusted R2 for the regression equation was 0.813. The regression equation for accurately predicting TV requirement was Y = 312 + 5.717X1 - 2.798X2 (Y, TV requirement; X1, weight; and X2, abdominal girth). Conclusion: TV requirement during mechanical ventilation for general anaesthesia can accurately be set based on weight and abdominal girth.

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Section: Discussionmentioning

confidence: 99%

“…TV has been reported to be related to age [10], height [11], weight [12], chest circumference [13,14], and abdominal girth [15]. However, it is unclear which of these has the strongest association with TV.…”

Section: Introductionmentioning

confidence: 99%

Weight and Abdominal Girth Predict Tidal Volume Requirement During Mechanical Ventilation for General Anaesthesia: A Cross-sectional Study

Shen

Chen

Zhou

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, validation of respiratory models of healthy or partially assisted (non-invasive MV) poses particular difficulty, as these measurements are not ethically or clinically feasible for conscious subjects. However, motion capture, inductance plethysmography, and strain gauge belts/ garments have been used to non-invasively measure changes in thoracic and abdominal volumes, but they require careful calibration, specific location conditions such as unobstructed view, and/or purchase of specialty equipment [6] , [7] , [8] , [9] . In this study, a basic tape measure is modified using a rotary encoder and spring to output dynamic change in unspooled length, which generates similar data to commercial analogs, at a much lower cost and higher degree of customization.…”

Section: Hardware In Contextmentioning

confidence: 99%