[Comparative study of oxygen tension in arterial blood and arterialized capillary blood in relation to the oxygen content of inspired air in healthy newborn infants].

The values of oxygen tension of arterial blood were compared with those of arterialized capillary blood in 65 healthy newborns. The latter ones always had a significantly lower level than the arterial ones. A sufficient correlation between paired values could be stated only under conditions of normal room air. With increasing FiO2 (0.4, 0.6, 1.0) the capillary oxygen tension remains behind the arterial one. Giving pure oxygen the capillary tension is nearly half of the arterial value.