The patient was started on nitroglycerin, heparin drips and transferred for cardiac catheterization.
 the patient was undergoing cardiac catherization
(ROOT (S (S (NP (DT The) (NN patient)) (VP (VBD was) (VP (VBN started) (PP (IN on) (NP (NP (NN nitroglycerin)) (, ,) (NP (NN heparin))))))) (VP (VP (VBZ drips)) (CC and) (VP (VBN transferred) (PP (IN for) (NP (JJ cardiac) (NN catheterization))))) (. .)))
(ROOT (S (NP (DT the) (NN patient)) (VP (VBD was) (VP (VBG undergoing) (NP (JJ cardiac) (NN catherization))))))
( ( ( The patient ) ( was ( started ( on ( ( nitroglycerin , ) heparin ) ) ) ) ) ( ( ( drips and ) ( transferred ( for ( cardiac catheterization ) ) ) ) . ) )
( ( the patient ) ( was ( undergoing ( cardiac catherization ) ) ) )