One-lung ventilation (OLV) during thoracic surgery and its effect on oxygen saturation has
been discussed in multiple studies. Literature shows different ventilation strategies and
possible hypoxemia has been attributed to several issues.
Port-access cardiac surgical procedures ("key hole surgery" including mitral valve repair or
prosthesis, tricuspid valve repair or prosthesis, atrial septal defect closure or a
combination of these) require the use of OLV as well. Its effect on oxygen saturation has not
been studied previously.
The aim of this study is to investigate the effect of extracorporeal circulation (ECC) and
patient positioning on oxygen saturation and on the progress of hypoxemia throughout OLV
during port-access in comparison to oxygen saturation throughout OLV during lateral decubitus