Final answer:
False, Premature Atrial and Ventricular Contractions (PACs and PVCs) are far more common than Premature Junctional Complexes (PJCs), which are rarer and usually associated with underlying heart conditions.
Step-by-step explanation:
The statement is False. Premature Junctional Complexes (PJCs) are less common than Premature Atrial Contractions (PACs) and Premature Ventricular Contractions (PVCs). PJCs occur when an ectopic focus in the atrioventricular junctional area fires before the next normal beat, leading to a premature heartbeat. PACs are early heartbeats originating from the atria, outside the sinoatrial node, while PVCs originate from an ectopic focus within the ventricles.
It is important to understand that both PACs and PVCs are more frequently encountered in clinical practice than PJCs. PACs and PVCs are commonly observed on routine electrocardiography (EKG), while PJCs are rarer occurrences and often associated with underlying heart conditions, such as heart disease or electrolyte imbalances.
In summary, premature junctional complexes are not more common than PACs and PVCs. PACs and PVCs are the more frequently observed premature complexes on an EKG due to their higher prevalence in the general population.