He continued to receive his daily aspirin, but his beta blocker was held secondary to his chronic obstructive pulmonary disease flare.
 The patient was taking propranolol. 
(ROOT (S (S (NP (PRP He)) (VP (VBD continued) (S (VP (TO to) (VP (VB receive) (NP (PRP$ his) (JJ daily) (NN aspirin)))))) (, ,)) (CC but) (S (NP (PRP$ his) (NN beta) (NN blocker)) (VP (VBD was) (VP (VBN held) (S (ADJP (JJ secondary) (PP (TO to) (NP (PRP$ his) (JJ chronic) (JJ obstructive) (JJ pulmonary) (NN disease) (NN flare)))))))) (. .)))
(ROOT (S (NP (DT The) (NN patient)) (VP (VBD was) (VP (VBG taking) (NP (NN propranolol)))) (. .)))
( ( ( ( He ( ( continued ( to ( receive ( his ( daily aspirin ) ) ) ) ) , ) ) but ) ( ( his ( beta blocker ) ) ( was ( held ( secondary ( to ( his ( chronic ( obstructive ( pulmonary ( disease flare ) ) ) ) ) ) ) ) ) ) ) . )
( ( The patient ) ( ( was ( taking propranolol ) ) . ) )