Intravenous administration of normal saline may be misinterpreted as a change of end-expiratory lung volume when using electrical impedance tomography.

ABSTRACT: Electrical impedance tomography (EIT) is a noninvasive imaging modality that allows real-time monitoring of regional lung ventilation. The aim of the study is to investigate whether fast saline infusion causes changes in lung impedance that could affect the interpretation of EIT data. Eleven pigs were anaesthetized and mechanically ventilated. A bolus of 500 mL of normal saline was administered rapidly. Two PEEP steps were performed to allow quantification of the effect of normal saline on lung impedance. The mean change of end-expiratory lung impedance (EELI) caused by the saline bolus was equivalent to a virtual decrease of end-expiratory lung volume (EELV) by 227 (188-250) mL and decremental PEEP step of 4.40 (3.95-4.59) cmH₂O (median and interquartile range). In contrast to

SUBMITTER: Sobota V 

PROVIDER: S-EPMC6453964 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature