A racing heartbeat can feel alarming, especially when it comes with dizziness, shortness of breath, chest discomfort, fatigue, or an alert from a smartwatch or wearable device. Atrial fibrillation (or Afib), atrial flutter, and supraventricular tachycardia (also called SVT) are three heart rhythm conditions that can cause those symptoms. While they are not the same condition, they often feel…
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