The ECG criteria to diagnose a posterior MI — treated like a STEMI, even though no real ST segment elevation is apparent — include: ST segment depression (not elevation) in V1 to V4.
ST depression, pathological Q-waves, left axis deviation and conduction delays and findings suggestive or diagnostic of primary electrical diseases such as long QT syndrome and Wolff-Parkinson-White ...
The most common ECG finding of an acute pulmonary embolism ... A posterior wall MI shows ST depression, not elevation in leads V1 and V2 with an R:S ratio greater that 1 in lead V1.