Lead Placement
Figure shows standard monitoring in lead II Basic providers need to know only that the limb leads are “snapshots” of the 12-lead ECG. The leads differ in morphology and are not reliable as a diagnostic tool beyond monitoring. In this regard, it is important to obtain a 12-lead ECG for diagnostic purposes in a stable patient when a significant change in rhythm occurs. Similarly, a post-conversion 12-lead ECG should be done when a persistent rhythm abnormality resolves or is converted to a normal rhythm. These ECGs may be invaluable in the diagnosis of an abnormal rhythm.