During hospitalization, patient became progressively more dyspnic requiring BiPAP and then a NRB.
 The patient is on room air. 
(ROOT (S (PP (IN During) (NP (NN hospitalization))) (, ,) (NP (NN patient)) (VP (VBD became) (NP (NP (RB progressively) (RBR more) (JJ dyspnic) (VBG requiring) (NN BiPAP)) (CC and) (ADVP (RB then)) (NP (DT a) (NN NRB)))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBZ is) (PP (IN on) (NP (NN room) (NN air)))) (. .)))
( ( During hospitalization ) ( , ( patient ( ( became ( ( ( ( progressively ( more ( dyspnic ( requiring BiPAP ) ) ) ) and ) then ) ( a NRB ) ) ) . ) ) ) )
( ( The patient ) ( ( is ( on ( room air ) ) ) . ) )