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Ventilation distribution and cardiac-related activities in ROI4 after RM in the nonresponder (left) and responder (right) groups. The diagonal dashed line represents the relative ventilation-perfusion index equal to 0. Blue stars correspond to the patients who showed remarkable mechanical recruitment (ln[ΔROI4] >1). Red circles correspond to the patients with an insufficient mechanical response to RM (ln[ΔROI4]≤1). RM = recruitment maneuver, ROI = region of interest.
