15 min
(mm Hg)
30 min
(mm Hg)
45 min
(mm Hg)
60 min
(mm Hg)
90 min
(mm Hg)
120 min
(mm Hg)

Total
(mm Hg)

PaCO2  40.5 ± 3.76 42.9 ± 4.72 45.8 ± 2.76 46.2 ± 3.44 43.5 ± 2.94 41.6 ± 1.99 44.3 ± 3.88
PetCO2 36.3 ± 4.13 38.8 ± 3.94 39.2 ± 2.84 39.6 ± 3.91 37.9 ± 5.11 36.9 ± 4.23 38.9 ± 4.01
PtcCO2 39.7 ± 3.62 44.1 ± 4.34 47.5 ± 5.37 47.8 ± 3.54 46.7 ± 2.35 45.1 ± 3.82 46.1 ± 3.95
Table 1: Comparison of PCO2 values determined using the various methods.