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Table 2 Statistical analysis of the changes in ventilation and oxygenation with changes in gas mixture in 10 infants with bronchiolitis who were on mechanical ventilation

From: Helium-oxygen mixture does not improve gas exchange in mechanically ventilated children with bronchiolitis

Gas mixture

PaCO2 (mmHg)

PaO2/FiO2

PaO2/PAO2

50%/50% Nitrogen/oxygen

45 ± 10

267 ± 108

0.43 ± 0.17

50%/50% Heliox

44 ± 10

267 ± 95

0.43 ± 0.15

60%/40% Heliox

43 ± 11

275 ± 87

0.45 ± 0.14

70%/30% Heliox

42 ± 12

259 ± 55

0.45 ± 0.09

  1. Values are expressed as mean ± standard deviation. Two-factor, repeated-measures analysis of variance found no statistically significant difference between the mean values for PaCO2, PaO2/FiO2, and PaO2/PAO2 for the different gas mixtures (P = 0.93, P = 0.98, and P = 0.96, respectively).