According to the results of a study presented recently at the annual Cardiovascular Magnetic Resonance (CMR 201) meeting, standard medical tests miss nearly two-thirds of heart attack diagnoses. “Unrecognised myocardial infarction (MI)” is the term used to define sub-clinical events that are missed in routine medical care but can be picked up by electrocardiogram (ECG) or by cardiovascular magnetic resonance (CMR) imaging, which is more accurate.