Supraventricular tachycardia, or SVT, refers to a tachycardia or abnormally elevated heart rate that causes the heart to pump before its chambers have filled with oxygenated blood. Women and those who smoke, drink, use caffeine, and/or struggle with anxiety are at increased risk. Symptoms may include chest pain and palpitations, dizziness, shortness of breath, fainting, and cardiac arrest. Though it can often be managed with a healthy lifestyle, SVT sometimes requires treatment with medication or medical procedures.