Late Breaking Abstract - Bedside Non-Invasive Radiation-Free Lung Ventilation/perfusion Mapping by Electrical Impedance Tomography in Lung Transplant Recipients

Management of mechanical ventilation and positive end-expiratory pressure (PEEP) selection after lung transplant (LUTX) is based on expert opinion. We obtained: 1/regional ventilation (V̇)/perfusion (Q̇) maps by integrating electrical impedance tomography (EIT), thermodilution technique, and volumetric capnometry; 2/ gas exchange; 3/ lung mechanics at 24 hours after reperfusion at 3 PEEPs (14, 10, and 6 cmH2O) in bilateral LUTX recipients protectively ventilated in volume control. To now, we enrolled 6 patients. EIT was feasible and - at all PEEP levels – showed similar distributions of V̇ and Q̇ distribution between left and right grafts (and thus adequate functioning of bronchial or vascular anastomosis) but a wide variability in regional V̇/Q̇ (Fig1). PEEP 10cmH2O resulted in the best respiratory system compliance and balance between collapse and hyperdistention (Fig2). In the immediate post-LUTX period, EIT is a feasible bedside, non-invasive option to assess V̇ and Q̇ distribution. Since PEEP affects the regional V̇/Q̇, PEEP 10cmH2O might be a reasonable starting point to personalize ventilation.