What is a couplet in the context of PVCs?

In the context of premature ventricular contractions (PVCs), a couplet refers specifically to the occurrence of two PVCs that happen in succession, without any intervening normal beats. This can be significant in rhythm interpretation as it indicates an increase in ectopic activity originating from the ventricles. The presence of couplets might suggest a higher frequency of arrhythmia or increased irritability of the myocardial tissue. Understanding this concept is crucial for recognizing patterns in dysrhythmias and assessing the potential clinical significance of ventricular ectopic beats.