How might a paroxysmal arrhythmia be triggered?

A paroxysmal arrhythmia is characterized by episodes of arrhythmia that occur suddenly and can resolve spontaneously. One common mechanism for triggering such arrhythmias is increased levels of physiological stress or physical activity. During times of stress or intense physical exertion, the autonomic nervous system, particularly the sympathetic branch, becomes more active. This can lead to changes in cardiac function, including alterations in heart rate and rhythm, potentially precipitating episodes of arrhythmia.

In contrast, prolonged inactivity generally leads to decreased stress on the cardiovascular system, and consistent medication is typically used to stabilize heart rhythm rather than trigger arrhythmias. Chronic conditions might contribute to the development of arrhythmias generally, but they are not direct triggers for paroxysmal events. Thus, stress or physical activity stands as the most relevant catalyst for the sudden onset of these arrhythmias.