Her son found her sitting on the floor yesterday evening and called 911.
 the patient had an acute MI
(ROOT (S (NP (PRP$ Her) (NN son)) (VP (VBD found) (S (S (NP (PRP$ her)) (VP (VBG sitting) (PP (IN on) (NP (DT the) (NN floor))) (NP (NN yesterday) (NN evening)))) (CC and) (VP (VBN called) (S (NP (CD 911)))))) (. .)))
(ROOT (S (NP (DT the) (NN patient)) (VP (VBD had) (NP (DT an) (JJ acute) (NNP MI)))))
( ( Her son ) ( ( found ( ( ( her ( ( sitting ( on ( the floor ) ) ) ( yesterday evening ) ) ) and ) ( called 911 ) ) ) . ) )
( ( the patient ) ( had ( an ( acute MI ) ) ) )