Noninvasive measurement of stroke volume changes in critically ill patients by means of electrical impedance tomography
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ORIGINAL RESEARCH
Noninvasive measurement of stroke volume changes in critically ill patients by means of electrical impedance tomography Fabian Braun1,2 · Martin Proença1,2 · Anna Wendler3 · Josep Solà1 · Mathieu Lemay1 · Jean‑Phillipe Thiran2,4 · Norbert Weiler3 · Inéz Frerichs3 · Tobias Becher3 Received: 24 April 2019 / Accepted: 10 October 2019 © Springer Nature B.V. 2019
Abstract Previous animal experiments have suggested that electrical impedance tomography (EIT) has the ability to noninvasively track changes in cardiac stroke volume (SV). The present study intended to reproduce these findings in patients during a fluid challenge. In a prospective observational study including critically ill patients on mechanical ventilation, SV was estimated via ECG-gated EIT before and after a fluid challenge and compared to transpulmonary thermodilution reference measurements. Relative changes in EIT-derived cardiosynchronous impedance changes in the heart ( ΔZH ) and lung region ( ΔZL ) were compared to changes in reference SV by assessing the concordance rate (CR) and Pearson’s correlation coefficient (R). We compared 39 measurements of 20 patients. ΔZH did not show to be a reliable estimate for tracking changes of SV (CR = 52.6% and R = 0.13 with P = 0.44). In contrast, ΔZL showed an acceptable trending performance (CR = 94.4% and R = 0.72 with P
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