Arterial partial pressure of oxygen (PaO
) of the pigs during the inhalation period. Mean values ± SEM of 6–7 animals. P = 0.014 between the control and 1% NCT + 1% NH4Cl, p > 0.05 between all other groups. * p < 0.05 for single values; ** p < 0.01 for single values compared to the control.