Experimental protocol
EVENT
Pediatric patients were screened for inclusion and exclusion criteria during the anesthesiology or pediatric surgery informed consent interview. Written informed consent was obtained from the parents/legal guardians after they were informed of the planned study. Demographic data, vital signs and medical history were obtained and documented.For later data evaluation, three time points were defined, which were marked during data recording by means of event markers.PCV = controlled ventilation, PSV = assisted ventilation, and SB = spontaneous breathing.On the day of the intervention, the inclusion and exclusion criteria were reevaluated. General anesthesia was induced and maintained by the responsible anesthesiologist. The appropriate electrode belt was applied and the exact position on the thorax.After a stable EIT signal could be derived, data recording was started before the operation began. To avoid artifacts and ensure usable data, no infant manipulations or ventilatory changes were performed for two minutes. All artifacts (e.g. due to cauterization) were marked during the further course of the measurement. After completion of surgery, extubation and sufficient spontaneous breathing, another two-minute rest measurement was taken.The collected data were processed after measurement using the Dräger EIT Application Version 1.30 (Dräger Medical Deutschland GmbH, Lübeck, Germany).