Respiratory failure & ventilation
Enhancing tidal volume estimation from electrical impedance tomography (EIT) by applying human anthropometric information
Authors' conclusion
Normalized dZ correlated strongly with VT_IBW in the individual ventilated humans but more weakly when analyzing the cohort. PEEP, gender, weight and height were identified as additional influencing factors.
Study context
- Population
- Patients undergoing elective surgery under GA, monitored with a commercially available EIT belt
- Participants
- 27 patients
- Outcome
- Relationship between normalized impedance changes (dZ) and VT per ideal bodyweight (VT_IBW)
Methodological detailsprospectively registered, Measurements at four VTs (6, 8, 10 and 12 mL/BW) on each of four PEEP levels (0, 5, 10 and 15 cmH2O)
- Prospectively registered
- Measurements at four VTs (6, 8, 10 and 12 mL/BW) on each of four PEEP levels (0, 5, 10 and 15 cmH2O)
Main finding
As reported in the abstract
Correlation of normalized dZ with VT_IBW (linear regression)
Individual patients: mean R2 (± 0.15)
0.890
Group of patients: R2 (rather weak)
0.485
Model including additional factors: adjusted R2
0.767
Observational data: associations, not effects.
Further findings
Influencing factors on normalized dZ
- VT_IBW had the biggest impact, followed by weight, height and PEEP; age did not contribute significantly
- Higher VT_IBW, PEEP and height increased, female gender and higher weight decreased normalized dZ
Original publication
Enhancing tidal volume estimation from electrical impedance tomography (EIT) by applying human anthropometric information. J Clin Monit Comput. Published 15 October 2025. doi:10.
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