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To evaluate the lung function of donors after circulatory deaths (DCDs),  ex vivo  lung perfusion (EVLP) has been shown to be a valuable method. We present modified EVLP where lung atelectasis is removed, while the lung perfusion is temporarily shut down. Twelve pigs were randomized into two groups: modified EVLP and conventional EVLP. When the lungs had reached 37°C in the EVLP circuit, lung perfusion was temporarily shut down in the modified EVLP group, and positive end-expiratory pressure (PEEP) was increased to 10 cm H 2 O for 10 minutes. In the conventional EVLP group, PEEP was increased to 10 cm H 2 O for 10 minutes with unchanged lung perfusion. In the modified EVLP group, the arterial oxygen partial pressure (PaO 2 ) was 18.5 ± 7.0 kPa before and 64.5 ± 6.0 kPa after the maneuver ( P  < 0.001). In the conventional EVLP group, the PaO 2  was 16.8 ± 3.1 kPa and 46.8 ± 2.7 kPa after the maneuver ( P  < 0.01;  P  < 0.01). In the modified EVLP group, the pulmonary graft weight was unchanged, while in the conventional EVLP group, the pulmonary graft weight was significantly increased. Modified EVLP with normoventilation of the lungs without ongoing lung perfusion for 10 minutes may eliminate atelectasis almost completely without harming the lungs.

A Short Period of Ventilation without Perfusion Seems to Reduce Atelectasis without Harming the Lungs duringEx VivoLung Perfusion