Masimo NASDAQ MASI today announced the findings of a retrospective study published in the Journal of Anesthesia in which Dr. Yu Jeong Bang and colleagues at the Samsung Medical Center Sungkyunkwan University School of Medicine in Seoul South Korea investigated the association of Masimo ORi and the arterial partial pressure of oxygen PaO2 in 554 patients who underwent noncardiac thoracic surgery during onelung ventilation OLV making this study the largest to date on ORi.