Fig. 1From: Perioperative redistribution of regional ventilation and pulmonary function: a prospective observational study in two cohorts of patients at risk for postoperative pulmonary complicationsElectric impedance tomography summation images during forced breathing in the abdominal surgery cohort over time. Summation images of normalized tidal images in 30 (preoperative), 26 patients (first postoperative day) and 27 patients (third postoperative day) are shown. The images depict changes from normal expiration to maximal inspiration. The center of the cross represents the center of ventilation (COV). Postoperatively the full cross represents the actual COV and the dashed cross the preoperative COVBack to article page