ST-segment elevation > 0.1mV in at least 2 contiguous leads
new or presumably new left bundle branch block
ST-segment depression with prominent R wave in leads V2 and V3, if this is thought to indicate a posterior infarction (benefit is doubtful if it is thought to indicate unstable angina)
time from onset of symptoms:
less than 6 hours - most beneficial
6 - 12 hours -lesser but still important benefits.
after 12 hours - diminishing benefits but possibly still useful for continuing chest pain or 'stuttering' pain course
age:
physiologic age more important than chronologic age
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