He was discharged on medical therapy and returns today for elective CABG.
 the patient has normal coronary arteries
(ROOT (S (NP (PRP He)) (VP (VBD was) (VP (VBN discharged) (PP (IN on) (NP (NP (NP (JJ medical) (NN therapy)) (CC and) (NP (NNS returns)) (NP (NN today))) (PP (IN for) (NP (JJ elective) (NNP CABG))))))) (. .)))
(ROOT (S (NP (DT the) (NN patient)) (VP (VBZ has) (NP (JJ normal) (JJ coronary) (NNS arteries)))))
( He ( ( was ( discharged ( on ( ( ( ( ( medical therapy ) and ) returns ) today ) ( for ( elective CABG ) ) ) ) ) ) . ) )
( ( the patient ) ( has ( normal ( coronary arteries ) ) ) )