(Ventricular Tachycardia; Supraventricular Tachycardia; Paroxysmal Atrial Tachycardia)
DefinitionTachycardia is a rapid heart rate of more than 100 beats per minute. Sinus tachycardia, from the heart's sinus node, is a normal response to exercise, illness, or stress. There are several types of abnormal tachycardias or arrhythmias . These can come from two places:
- Atria (the two smaller chambers on the top of the heart)—called supraventricular tachycardias
- Ventricles (the lower chambers of the heart)—called ventricular tachycardia
|Electrical System and Chambers of the Heart|
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CausesThis condition is caused by abnormal electrical impulses that control the heart.
Risk FactorsFactors that may increase your chance of tachycardia include:
- Heart disease, especially a prior heart attack
- Cardiomyopathy —damage to the muscle wall of the lower chambers of the heart
- Electrolyte abnormalities—too much or too little calcium, sodium, magnesium, and potassium in the blood
- Myocardial ischemia—insufficient blood flow to heart muscle tissue
- Hypoxemia—not enough oxygen in the blood
- Acidosis—too much acid in the body’s fluids
SymptomsTachycardia may cause:
- Heart palpitations
- Fast heart rate
- Fainting or near fainting
- Chest pain
- Shortness of breath
DiagnosisYour doctor will ask about your symptoms and medical history. A physical exam will be done.Tests may include:
- Electrocardiogram (EKG) to assess electrical activity of the heart
- Holter monitor or event monitor —an ambulatory monitor to record your heart rhythm
- Exercise test —particularly if the symptoms occur during physical activity
- Electrophysiology study —an invasive test where monitoring wires are placed inside the heart and the heart's conduction system is tested directly
- Cardiac catheterization —a tube-like instrument inserted into the heart through a vein or artery (usually in the arm or leg) to detect problems with the heart and its blood supply
TreatmentTalk with your doctor about the best treatment plan for you. Treatment options include the following:
MedicationsMedications to treat tachycardia include:
- Calcium channel blockers
AblationAblation is done during an electrophysiology study. Radiofrequency energy or cold energy is used to destroy the abnormality and possibly cure the problem. ventricular tachycardia or ventricular fibrillation . It is also done for milder arrhythmias, such as atrial fibrillation .
Implantable Cardioverter Defibrillator (ICD)An ICD can be surgically placed into your body. This device monitors your heartbeat. It can apply a shock to correct an irregular heartbeat.
|Device to Correct Tachycardia|
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PreventionTo help reduce your chance of tachycardia:
- Maintain a healthy weight
- Begin a safe exercise program with the advice of your doctor
- If you smoke, talk to your doctor about how you can successfully quit
- Eat a healthful diet , one that is low in saturated fat and rich in whole grains, fruits, and vegetables
- Manage stress
- Avoid or limit the intake of caffeine and alcohol
- Have regular physical exams
- Treat underlying medical problems , such as high blood pressure or high cholesterol
Heart Rhythm Society
Society of Thoracic Surgeons
Canadian Cardiovascular Society
Arrhythmias. American Heart Association website. Available at: http://www.heart.org/HEARTORG/Conditions/Arrhythmia/Arrhythmia%5FUCM%5F002013%5FSubHomePage.jsp.Accessed December 30, 2014.
Cardioversion of atrial fibrillation. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed.Updated November 12, 2014. Accessed December 30, 2014.
Implantable cardioverter defibrillator (ICD). EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed.Updated November 19, 2014. Accessed December 30, 2014.
Risk factors and prevention. Heart Rhythm Society website. Available at: http://www.hrsonline.org/Patient-Resources/Risk-Factors-Prevention#axzz3NOr35s6f.Accessed December 30, 2014.
Supraventricular tachycardia (SVT). EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed.Updated June 5, 2014. Accessed December 30, 2014.
Ventricular tachycardia. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed.Updated August 8, 2013. Accessed December 30, 2014.
- Reviewer: Michael J. Fucci, DO
- Review Date: 12/2014
- Update Date: 12/20/2014
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