Fig. 1From: Electrical impedance tomography to determine optimal positive end-expiratory pressure in severe chronic obstructive pulmonary diseaseDelays in ventilation as an index of ventilation heterogeneity calculated by EIT using different levels of positive end-expiratory pressure (PEEP) as a percentage of the calculated intrinsic PEEP (iPEEP). Setting PEEP at 80 % of iPEEP achieves the greatest homogeneity of ventilationBack to article page