What does the term "paroxysmal" refer to in medical context?

The term "paroxysmal" in a medical context specifically refers to events that begin suddenly or abruptly, often associated with convulsive or explosive episodes. This characteristic of sudden onset is crucial in the description of various medical conditions, such as paroxysmal atrial fibrillation or paroxysmal nocturnal dyspnea, where episodes can occur unexpectedly and typically resolve. This sudden nature indicates that the episodes are distinct from conditions that may present with a gradual onset or that maintain a chronic, continuous state. Understanding that "paroxysmal" describes these abrupt episodes helps in accurately diagnosing and managing conditions that exhibit this pattern.