3767713 PETO2 end-tidal PO2 14 3767717 PETO2 pressures of end-tidal O2 2 3767714 PETO2 peripheral ventilatory response dynamics to changes in end-tidal O2 tension 1 3767721 PETO2 PETCO2, and end-tidal oxygen tension 1 3767715 PETO2 plethysmographically, and end-tidal PO2 1 3767716 PETO2 positive correlation was found between SaO2 and end-tidal PO2 1 3767718 PETO2 prestudy value, end-tidal PO2 1 3767719 PETO2 progressively increased with decreasing end-tidal PO2 1 3767720 PETO2 protocols, end-tidal PO2 1