Usefulness of Three Posterior Chest Leads for the Detection of Posterior Wall Acute Myocardial Infarction

A 15-lead electrocardiogram in response to LC occlusion. A representative electrocardiographic tracing from a patient at baseline (A) and during fully occlusive balloon inflation in the proximal LC artery (B). ST-segment elevation is evident in the posterior leads (V₇ to V₉) despite no significant ST elevation in the standard 12 leads.

ST deviation. Maximum ST deviation for all 15 leads during and after balloon inflation in the left circumflex artery. Error bars = the SD around the mean.

ST elevation. Percentage of patients showing ST elevation in each of the 15 leads after balloon inflation in the LC artery.