Relationship between fast sodium-mediated myocardial action potential and surface electrocardiogram
Relationship between fast sodium-mediated myocardial action potential and surface electrocardiogram
Each phase of the myocardial action potential (numbers, upper panel) corresponds to a deflection or interval on the surface ECG (lower panel). Phase 4, the resting membrane potential, is responsible for the TQ segment; this segment has a prominent role in the ECG manifestations of ischemia during exercise testing.