On arrival to the MICU, non-invasive ventilation was attempted but unsuccessful [**2-6**] facial structure.
 The patient subsequently received an endotracheal tube
(ROOT (FRAG (PP (IN On) (NP (NP (NN arrival)) (PP (TO to) (NP (DT the) (NNP MICU))))) (, ,) (NP (JJ non-invasive) (NN ventilation)) (UCP (VBD was) (VP (VBN attempted)) (CC but)) (NP (JJ unsuccessful)) (-LRB- -LSB-) (FRAG (NP (SYM **) (QP (CD 2-6)) (X (SYM **)) (-RRB- -RSB-) (JJ facial) (NN structure))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (ADVP (RB subsequently)) (VP (VBD received) (NP (DT an) (JJ endotracheal) (NN tube)))))
( ( On ( arrival ( to ( the MICU ) ) ) ) ( , ( ( non-invasive ventilation ) ( ( was ( attempted but ) ) ( unsuccessful ( -LSB- ( ( ** ( 2-6 ( ** ( -RSB- ( facial structure ) ) ) ) ) . ) ) ) ) ) ) )
( ( The patient ) ( subsequently ( received ( an ( endotracheal tube ) ) ) ) )