Δ Z: impedance change; CT: computed tomography; EELV: end-expiratory lung volume; EIT: electrical impedance tomography; fEIT: functional electrical impedance tomography; PEEP: positive end-expiratory pressure; ROI: region of interest.
During all phases we assessed gas exchange, lung volumes by electrical impedance tomography and inspiratory effort by esophageal pressure.
Given that no perfect method exists currently for identification of collapsed lung areas by electrical impedance tomography, our approach [ 5] guarantees to include as much of the collapsed lung regions as is detectable in the analysis of ventilation inhomogeneity and provides satisfactory results, as shown in a preliminary study by comparison with computed tomography.
a.u., arbitrary units; ALI, acute lung injury; EAdi, diaphragm electrical activity; NS, not significant.
A recent study in ALI/ARDS patients used a combination of oxygenation data (venous admixture) and lung mechanics obtained by electrical impedance tomography [ 16].
The objective of our study was to test this hypothesis in a prospective, double cross-over intervention trial comparing heliox 60/40 with conventional gas (nitrox) using lung function testing and electrical impedance tomography (EIT) measurements.
Nevertheless, a recent study of Riera and coworkers [ 17] shows an increase in end-exspiratory lung volume, messured by electrical impedance tomography (EIT), presumably due to the higher airway pressure levels.
References. 1. Maisch S, Bohm SH, Solà J et al: Heart-lung interactions measured by electrical impedance tomography.Crit Care Med 2011; 39: 217396.
It is possible to distinguish between lung ventilation and perfusion using Electrical Impedance Tomography (EIT).
Lung mechanics, regional ventilation distribution (electrical impedance tomography), cerebral tissue oxygenation index (near infrared spectroscopy), arterial pressures and blood gas values were recorded regularly.
