1Nunn JF,Hill DW.Respiratory dead space and aterial to end tidal CO2 tension difference in anesthetized man.J Appl Physiol,1960,15:383-389.
2Takki S,Aromaa U,Kauste A.The validity and usefulness of the end-tidal PCO2 during anesthesia. Ann Clin Res ,1972,4:278-284.
3Whitesell R,Asiddao C,Gollman D,et al. Relationship between arterial and peak expired carbon dioxide pressure during anesthesia and factors influencing the difference. Anesth Analg, 1981,60:508-512.
