Atrial fibrillation is the most common type of tachycardia.Some people experience no symptoms, but in extreme cases, you may lose consciousness and, very rarely, have cardiac arrest. It's the most common type of tachycardia in children and also more common in women than in men. Supraventricular tachycardia occurs in the upper chambers of the heart.Sinus tachycardia is not usually considered dangerous because your heart is still beating properly. It originates from the heart's sinoatrial node, commonly known as the heart's natural pacemaker. Sinus tachycardia is a normal increase in heart rate, which can happen when you're exercising, scared, or anxious.Some are not considered a danger to your health while others should be monitored closely. There are multiple types of tachycardia, which are categorized by where they originate in the heart.
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