A posterior ECG is done by simply adding three extra precordial leads wrapping around the left chest wall toward the back. Below are some examples including isolated posterior MIs, inferior STEMIs ...

Stage I (acute phase): Diffuse concave upward ST segment elevation in most leads, PR depression in ... and thus the ECG is back to normal. Note: The ECG changes with pericarditis must be ...

As noted above, the precordial leads are unreliable, compromising by their inclusion calculations deriving from the set of 12 ECG leads. It appears, therefore, that using sums of data from the six ...

and a medical ECG has twelve signals measured from ten electrodes across the body. Four of these are on the hands and feet, while six more leads are located on the chest near the heart.