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Assessment of regional ventilation distribution: comparison of vibration response imaging (VRI) with electrical impedance tomography (EIT)
- Source :
- PLoS ONE, Vol 9, Iss 1, p e86638 (2014), PLoS ONE
- Publication Year :
- 2014
-
Abstract
- BACKGROUND: Vibration response imaging (VRI) is a bedside technology to monitor ventilation by detecting lung sound vibrations. It is currently unknown whether VRI is able to accurately monitor the local distribution of ventilation within the lungs. We therefore compared VRI to electrical impedance tomography (EIT), an established technique used for the assessment of regional ventilation. METHODOLOGY/PRINCIPAL FINDINGS: Simultaneous EIT and VRI measurements were performed in the healthy and injured lungs (ALI; induced by saline lavage) at different PEEP levels (0, 5, 10, 15 mbar) in nine piglets. Vibration energy amplitude (VEA) by VRI, and amplitudes of relative impedance changes (rel.ΔZ) by EIT, were evaluated in seven regions of interest (ROIs). To assess the distribution of tidal volume (VT) by VRI and EIT, absolute values were normalized to the VT obtained by simultaneous spirometry measurements. Redistribution of ventilation by ALI and PEEP was detected by VRI and EIT. The linear correlation between pooled VT by VEA and rel.ΔZ was R(2) = 0.96. Bland-Altman analysis showed a bias of -1.07±24.71 ml and limits of agreement of -49.05 to +47.36 ml. Within the different ROIs, correlations of VT-distribution by EIT and VRI ranged between R(2) values of 0.29 and 0.96. ALI and PEEP did not alter the agreement of VT between VRI and EIT. CONCLUSIONS/SIGNIFICANCE: Measurements of regional ventilation distribution by VRI are comparable to those obtained by EIT.
- Subjects :
- Diagnostic Imaging
Pathology
medicine.medical_specialty
Anatomy and Physiology
Critical Care and Emergency Medicine
Pulmonology
Vibration Response Imaging
Swine
Respiratory System
Lung sound
lcsh:Medicine
Vibration
Model Organisms
Respiratory Failure
Anesthesiology
Bedside Technology
Electric Impedance
medicine
Medical imaging
Animals
Respiratory Physiology
ddc:610
lcsh:Science
Tomography
Biology
Electrical impedance tomography
Anesthesiology Monitoring
Physics
Analysis of Variance
Models, Statistical
Anesthesiology Technology
Multidisciplinary
lcsh:R
Animal Models
respiratory system
respiratory tract diseases
Pulmonary imaging
Spirometry
Breathing
Medicine
lcsh:Q
Pulmonary Ventilation
Research Article
Biomedical engineering
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- PLoS ONE, Vol 9, Iss 1, p e86638 (2014), PLoS ONE
- Accession number :
- edsair.doi.dedup.....fdf9fb28faaf54325dc0073898401811