ERP stands for which term in cardiac electrophysiology?

ERP stands for which term in cardiac electrophysiology?

• A. Enduring refractory period
• B. Electrical refractory period
• C. Excitable refractory period
• D. Effective refractory period

Answer: (D)

The main idea is understanding refractoriness after an action potential: after the heart tissue has been excited, there is a window of time when a new impulse cannot propagate to adjacent cells. This is described by the effective refractory period. It is the portion of refractoriness during which an incoming impulse, even if strong, fails to produce a propagated impulse. Practically, the ERP defines the functional block to conduction; once this period ends, a stronger stimulus can again trigger a propagating action potential. This term is used to describe the conduction-block phase of refractoriness, whereas the other phrases are not standard terms in cardiac electrophysiology.

The main idea is understanding refractoriness after an action potential: after the heart tissue has been excited, there is a window of time when a new impulse cannot propagate to adjacent cells. This is described by the effective refractory period. It is the portion of refractoriness during which an incoming impulse, even if strong, fails to produce a propagated impulse. Practically, the ERP defines the functional block to conduction; once this period ends, a stronger stimulus can again trigger a propagating action potential. This term is used to describe the conduction-block phase of refractoriness, whereas the other phrases are not standard terms in cardiac electrophysiology.