What is paroxysmal supraventricular tachycardia (PSVT)?

Paroxysmal supraventricular tachycardia (PSVT) is characterized as a rapid heart rate that originates from impulses above the ventricles, specifically from the atria or the atrioventricular (AV) node. This condition can present itself as sudden episodes of increased heart rate, often exceeding 100 beats per minute, which may last for a few moments to several hours. The underlying mechanism typically involves abnormal electrical circuits within the heart that cause the atria to fire excessively, leading to the rapid heart rhythm.

In contrast, conditions characterized by slow heart rate, heart failure, or arrhythmias without symptoms do not describe the phenomenon of PSVT. Understanding PSVT is crucial for recognizing its symptoms and potential triggers, which can include stress, caffeine, or certain medications, leading to effective management and treatment approaches.