Abstract
BackgroundElectrical impedance tomography (EIT) is used on the thorax to measure impedance changes due to the presence of air and blood in the lung. This experimental study was performed to investigate the effect of posture on cardiac and respiratory related impedance changes.MethodsEIT measurements were performed on 14 healthy subjects in left-, right lateral, prone, supine and upright positions. Simultaneously, tidal volume was recorded with an ultrasonic flowmeter. For image reconstruction, the classic Sheffield back-projection and three variants of the modern GREIT algorithm were applied with two different reference frames. Amplitudes of cardiac- and respiratory impedance changes were extracted and compared between the positions.ResultsWe found significant differences in both cardiac and respiratory amplitudes between postures. Especially, supine and upright positions showed dramatic changes in amplitude. These differences between postures were unaffected by the change of reference frames in all reconstruction methods except of the classic Sheffield back projection. Possible sources that explain the observed posture dependency are discussed.ConclusionResearchers and clinicians need to be aware of this phenomenon when comparing EIT amplitudes in different body positions.
Highlights
Electrical impedance tomography (EIT) has become increasingly important for bedside monitoring of ventilation distribution [1]
Impedance changes have a linear relationship with changes in lung volume [3]
We present evidence that the amplitudes of cardiac related impedance changes are dependent on body position and on the reconstruction algorithm used
Summary
Electrical impedance tomography (EIT) has become increasingly important for bedside monitoring of ventilation distribution [1]. The respiratory induced impedance change can be measured, and cardiac related changes within the heart region and lung tissue can be observed [4]. Electrical impedance tomography (EIT) is used on the thorax to measure impedance changes due to the presence of air and blood in the lung. This experimental study was performed to investigate the effect of posture on cardiac and respiratory related impedance changes
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