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I want to get healthier. Close Health Alerts from Harvard Medical School Get helpful tips and guidance for everything from fighting inflammation to finding the best diets for weight loss Close Stay on top of latest health news from Harvard Medical School. Sign me up. Your doctor may also be able to recommend some simple techniques to help stop episodes when they happen. SVT is rarely life threatening.
But you may need treatment in hospital if you keep having long episodes. Page last reviewed: 27 April Next review due: 27 April Supraventricular tachycardia SVT. Bradycardia is the opposite problem - instead of your heart pumping too quickly, your heart is pumping too slowly , meaning, less than 60 beats per minute.
Bradycardia tends to occur in seniors, but is also usually a mild condition that does not affect the quality of life for those affected. Tachycardia has multiple types, all of which have overlap in symptoms. Experiencing tachycardia usually includes:. Despite this overlap, the different types of tachycardia have their own risk factors, symptoms, and treatments. There are several types of tachycardia. The type you have depends on your age, overall health, and other factors, including frequency of symptoms:.
Symptoms of a ventricular tachycardia episode include shortness of breath, nausea, falling unconscious, and palpitations. For instance, it's normal for your heart rate to rise during exercise or as a response to stress, trauma or illness. But in tachycardia tak-ih-KAHR-dee-uh , the heart beats faster than normal due to conditions unrelated to normal physiological stress. In some cases, tachycardia may cause no symptoms or complications. But if left untreated, tachycardia can disrupt normal heart function and lead to serious complications, including:.
Treatments, such as drugs, medical procedures or surgery, may help control a rapid heartbeat or manage other conditions contributing to tachycardia. There are many different types of tachycardia. They're grouped according to the part of the heart responsible for the fast heart rate and cause of the abnormally fast heartbeat.
Common types of tachycardia include:. Atrial fibrillation. Atrial fibrillation is a rapid heart rate caused by chaotic, irregular electrical impulses in the upper chambers of the heart atria. These signals result in rapid, uncoordinated, weak contractions of the atria.
Atrial fibrillation may be temporary, but some episodes won't end unless treated. Atrial fibrillation is the most common type of tachycardia. Atrial flutter. In atrial flutter, the heart's atria beat very fast but at a regular rate. The fast rate results in weak contractions of the atria. Atrial flutter is caused by irregular circuitry within the atria. Episodes of atrial flutter may go away themselves or may require treatment. People who have atrial flutter also often have atrial fibrillation at other times.
Ventricular tachycardia. Ventricular tachycardia is a rapid heart rate that starts with abnormal electrical signals in the lower chambers of the heart ventricles. The rapid heart rate doesn't allow the ventricles to fill and contract efficiently to pump enough blood to the body. Ventricular tachycardia episodes may be brief and last only a couple of seconds without causing harm.
But episodes lasting more than a few seconds can become a life-threatening medical emergency. Ventricular fibrillation.
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