EKG showed T-wave depression in V3-5, with no prior EKG for comparison.
 The EKG shows signs of cardiac ischemia. 
(ROOT (S (NP (NNP EKG)) (VP (VBD showed) (NP (NP (JJ T-wave) (NN depression)) (PP (IN in) (NP (NN V3-5)))) (, ,) (PP (IN with) (NP (NP (DT no) (JJ prior) (NNP EKG)) (PP (IN for) (NP (NN comparison)))))) (. .)))
(ROOT (S (NP (DT The) (NNP EKG)) (VP (VBZ shows) (NP (NP (NNS signs)) (PP (IN of) (NP (JJ cardiac) (NN ischemia))))) (. .)))
( EKG ( ( ( ( showed ( ( T-wave depression ) ( in V3-5 ) ) ) , ) ( with ( ( no ( prior EKG ) ) ( for comparison ) ) ) ) . ) )
( ( The EKG ) ( ( shows ( signs ( of ( cardiac ischemia ) ) ) ) . ) )