Acute inferior MI. (With complete AV block)
ST elevation in II, III, aVF. Reciprocal ST depression in I, aVL, V1-V3. (V1-V6 in this case). This ECG also shows complete AV block. See ST T abnormalities in acute ST elevation MI table.
Right side chest leads placement
Right side chest lead should be obtained at the same time as initial ECG or within 6 hours after the onset of MI to assist the diagnosis of RV infarct associate with acute inferior MI. Look for ST elevation in V3R or V4R >1mm.

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