Paroxysmal Supraventricular Tachycardia: Understanding the Condition
Paroxysmal Supraventricular Tachycardia (PSVT) is a heart rhythm disorder that causes sudden episodes of rapid heartbeat. The term “paroxysmal” refers to its sudden onset and ending, while “supraventricular” indicates that the abnormal rhythm starts above the heart’s ventricles, usually in the atria or the atrioventricular (AV) node. Although PSVT is not always life-threatening, it can be distressing and may require medical attention depending on its frequency and severity.
Causes and Mechanism
PSVT occurs when electrical signals in the heart follow abnormal pathways, leading to rapid heartbeats. Normally, the heart’s rhythm is controlled by the sinoatrial (SA) node, which sends signals in a regular pattern. In PSVT, reentry circuits or extra pathways create a loop, causing the heart to beat much faster than normal. Triggers may include stress, caffeine, alcohol, nicotine, or certain medications, although in many cases, episodes happen without a clear cause.
Symptoms…

