Tachycardia

A normal heart rate falls between the range of 60 to 100 beats per minute. With tachycardia the heart beats too fast and at a rate of greater than 100 beats per minute at rest. There are several different types of tachycardia, including:
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Supraventricular tachycardia (SVT)/Paroxysmal supraventricular tachycardia (PSVT). This starts in the upper heart chambers (the atria), preventing the heart chambers from completely filling in between contractions (beats). This can restrict blood flow throughout the body. It is the most common type of heart arrythmia in children and infants.
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Sinus tachycardia. Sinus tachycardia occurs when the sinus node sends out electrical signals more rapidly than normal. While this can happen during exercise, it could indicate a greater problem if occurring at rest.
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Ventricular tachycardia. Ventricular tachycardia begins in the lower heart chambers (ventricles). Again, it prevents the heart chambers from filling completely in between contractions, which can impact blood flow throughout the rest of the body.
Individuals with persistent tachycardia at rest should seek medical attention and may require treatment or intervention.