Page 333 - ECG dr shamol_Slide

There is isolated ST depression in precordial leads, deeper in
V2 - V4 than in V5 or V6. There is no ST Elevation. Precordial
ST depression may be subendocardial ischemia or posterior
STEM

If you thought it might be a posterior STEMI, then you might

have ordered a posterior ECG [change leads V4-V6 around to
the back (V7-V9)].

Notice the limb leads have been reversed (axes of every lead
are inverted!). But we are now concerned with the precordial
leads. V7-V9 (labelled V4-V6) have no ST elevation.