Paroxysmal atrial tachycardia is a sudden onset and termination of a rapid heart rhythm originating from an ectopic focus in the atria, typically with rates between 140 and 250 beats per minute. It is clinically important because it can cause palpitations, dizziness, or hemodynamic instability, requiring prompt recognition and management to prevent complications. A key association is its potential to trigger atrial fibrillation or contribute to thromboembolic events if sustained.