• M Colmenero-Ruiz, D Pola-Gallego de Guzmán, M M Jiménez-Quintana, and E Fernández-Mondejar.
• Department of Intensive Medicine, Virgen de las Nieves Hospital, Avenida de las Fuerzas Armadas 2, 18014 Granada, Spain. colruima@arrakis.es
• Intensive Care Med. 2001 Mar 1;27(3):566-73.

ObjectiveTo analyze the effect of abdomen release in the prone position on oxygenation in an experimental model of acute lung injury.DesignExperimental randomized controlled study.SettingExperimental laboratory of a tertiary university hospital.ParticipantsMixed-breed adolescent pigs weighing between 25-31 kg.InterventionsThirty minutes after pulmonary edema was produced with oleic acid, the animals were turned prone and randomized into two groups: group I or control (n = 9), lying directly on the operating table; and group II (n = 11) with abdomen release, with positioning rolls under the upper part of the chest wall and the pelvis to allow free movement of the abdomen.Measurements And ResultsThe gas exchange, respiratory mechanics, hemodynamics, intra-abdominal pressure (IAP) and the extravascular lung water (EVLW), determined by double indicator dilution method (DI), were recorded at baseline (time 0) and at 30, 60, 90, 120 and 150 min. The PaO2/FIO2 increased in both groups at 30 min after the pigs were placed in the prone position (time 60) and then decreased progressively until the end of the experimental period, with no statistical differences between the groups at any time (73.1 +/- 14.5 vs 79.5 +/- 14.9 at 150 min). Abdomen release was not associated with changes in the respiratory mechanics, EVLW or intra-abdominal pressure.ConclusionsAbdomen release in prone position does not improve oxygenation in an experimental model of acute lung injury.

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