( ( Arterial ( blood gases ) ) ( ( showed ( severe ( respiratory ( ( acidosis and ) hypoxemia ) ) ) ) . ) )
(ROOT (S (NP (JJ Arterial) (NN blood) (NNS gases)) (VP (VBD showed) (NP (JJ severe) (NN respiratory) (NNS acidosis) (CC and) (NN hypoxemia))) (. .)))
Arterial blood gases showed severe respiratory acidosis and hypoxemia.
(ROOT (S (NP (JJ Respiratory) (NNS acidosis)) (VP (VBZ is) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (ADJP (JJ problematic) (PP (IN because) (NP (NP (JJ excess) (NNS co2)) (PP (IN in) (NP (NN blood))))))))))) (. .)))