passages.id: 281
passages.type: sentence
passages.text: [ The effect of ionic and nonionic x-ray contrast media on myocardial perfusion and myocardial function ] .
entities.id: 282
entities.type: intervention
entities.text: ionic
entities.id: 283
entities.type: intervention
entities.text: nonionic x-ray contrast
entities.id: 284
entities.type: outcome
entities.text: myocardial perfusion and myocardial function