His respiratory status has been stable until 10 days PTA when he gradually became more SOB, orthopneic, and had PND.
 The patient has congestive heart failure. 
(ROOT (S (NP (PRP$ His) (JJ respiratory) (NN status)) (VP (VBZ has) (VP (VBN been) (ADJP (JJ stable)) (PP (IN until) (NP (NP (NP (CD 10) (NNS days)) (NP (NNP PTA))) (SBAR (WHADVP (WRB when)) (S (NP (PRP he)) (ADVP (RB gradually)) (VP (VBD became) (NP (NP (RBR more) (NN SOB)) (, ,) (NP (NN orthopneic)) (, ,) (CC and) (VP (VBD had) (NP (NNP PND))))))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBZ has) (NP (JJ congestive) (NN heart) (NN failure))) (. .)))
( ( His ( respiratory status ) ) ( ( has ( ( been stable ) ( until ( ( ( 10 days ) PTA ) ( when ( he ( gradually ( became ( ( ( ( ( ( more SOB ) , ) orthopneic ) , ) and ) ( had PND ) ) ) ) ) ) ) ) ) ) . ) )
( ( The patient ) ( ( has ( congestive ( heart failure ) ) ) . ) )