• N Mert Sentürk, Ahmet Dilek, Emre Camci, Evren Sentürk, Mukadder Orhan, Mehmet Tuğrul, and Kamil Pembeci.
• Department of Anaesthesiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey. senturkem@superonline.com
• J. Cardiothorac. Vasc. Anesth. 2005 Feb 1;19(1):71-5.

ObjectivesThe purpose of this study was to investigate the effects of PEEP on oxygenation and airway pressures during PCV-OLV.DesignRandomized, crossover, clinical study.SettingUniversity hospital.ParticipantsTwenty-five patients undergoing thoracotomy.InterventionsDuring the first 5 minutes of OLV, all patients were ventilated with VCV (PEEP: 0) (VCV-ZEEP). Afterward, ventilation was changed to PCV with PEEP: 0 (PCV-ZEEP) or PEEP: 4 cmH2O (PCV-PEEP) for 20 minutes. In the following 20 minutes, PCV-PEEP and PCV-ZEEP were applied in reverse sequence.Measurements And Main ResultsAt the end of VCV-ZEEP airway pressures (peak airway pressure, plateau airway pressure, mean airway pressure, and pause airway pressure) were recorded. At the end of PCV-PEEP and PCV-ZEEP airway pressures, PaO2 and Qs/Qt were recorded. Ppeak and Pplat were significantly lower with PCV-PEEP compared with VCV-ZEEP (eg, Ppeak: 33.4+/-4.2, 28.3+/-4.1, and 28.9+/-3.7 cmH2O in VCV-ZEEP, PCV-ZEEP, and PCV-PEEP, respectively; p<0.05 for PCV-ZEEP v VCV-ZEEP and PCV-PEEP v VCV-ZEEP). PCV-PEEP was associated with an increased PaO2 (230.3+/-69.8 v 189.0+/-54.8 mmHg, p<0.05) and decreased Qs/Qt (33.4%+/-7.3% v 38.4%+/-5.7%, p<0.05) compared with PCV-ZEEP (mean+/-SD). Eighty-eight percent of the patients have benefited from PEEP.ConclusionDuring OLV, PCV with a low level of PEEP leads to improved oxygenation with lower airway pressures.

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