( ( Arterial ( blood gas ) ) ( ( ( ( ( shows ( ( low levels ) ( of ( oxygen ( -LRB- ( hypoxemia -RRB- ) ) ) ) ) ) and ) respiratory ) acidosis ) . ) )
(ROOT (S (NP (JJ Arterial) (NN blood) (NN gas)) (VP (VP (VBZ shows) (NP (NP (JJ low) (NNS levels)) (PP (IN of) (NP (NP (NN oxygen)) (PRN (-LRB- -LRB-) (NP (NNP hypoxemia)) (-RRB- -RRB-)))))) (CC and) (ADVP (RB respiratory)) (VP (VBZ acidosis))) (. .)))
Arterial blood gas shows low levels of oxygen (hypoxemia) and respiratory acidosis .
(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))))))))))) (. .)))