Final answer:
PSVT (Paroxysmal Supraventricular Tachycardia) is caused by abnormal electrical circuits in the heart, often due to an extra pathway, which can cause rapid heartbeats. Certain conditions, like Wolff-Parkinson-White syndrome, and triggers like stress and caffeine contribute to its onset.
Step-by-step explanation:
Etiology of PSVT
Paroxysmal Supraventricular Tachycardia (PSVT) is a condition characterized by an abnormally fast heartbeat that originates above the ventricles. The etiology of PSVT often involves electrical re-entry mechanisms where a circular movement of electrical impulses in the heart's conduction system occurs. This is typically due to the presence of an extra pathway or shortcut in the heart's electrical circuit which can cause sudden episodes of rapid heartbeat. One common type of PSVT is Wolff-Parkinson-White syndrome, where an extra electrical pathway is present from birth. Atrial flutter and atrial fibrillation can also be associated with PSVT. However, triggers such as stress, caffeine, alcohol, and some medications may also initiate these episodes in susceptible individuals. Ultimately, the etiology of PSVT can vary widely from person to person, with a number of potential underlying conditions and triggers playing a role.