Ventricular tachycardia is an abnormally fast heart rate that originates in one of the two lower chambers of the heart, known as ventricles. It is diagnosed when there are three or more beats in succession originating from a ventricle, at a rate greater than 100 beats per minute but less than 200 beats per minute.
Ventricular tachycardia is considered sustained if it lasts more than 30 seconds. When this condition is sustained, the ventricles won’t be able to fill with enough blood for the heart to keep blood flowing properly through the body. This can result in lowered blood pressure, heart failure, and death.
The rhythm of the heartbeat may be regular or irregular when a person has ventricular tachycardia. This condition is challenging to diagnose because it often happens in emergency situations and must be identified and treated very quickly.
Heart Chambers and Valves
There are several different factors that may cause ventricular tachycardia. Scar tissue from a previous, healed heart attack can make it difficult for the ventricles to function, causing increased heart rate. Certain drugs have side effects that may affect the heart rate.
A risk factor is something that increases your chance of getting a disease or condition.
The following factors may increase your chance of ventricular tachycardia:
Coronary Artery Disease
- A sensation of the heart beating very rapidly
- Feeling dizzy
- Feeling short of breath
- Chest discomfort
- Pale skin tone
A physician will most likely rely on an
(ECG), a measure of the electrical activity of the heart as it contracts, to diagnose this condition. Some patients may be asked to wear a portable ECG to record their heart rate for 24 hours. A doctor may also insert a catheter into the heart to get a better image of the organ. Other tests could include an
A doctor may recommend any of the following treatments:
- In an emergency situation, CPR
Although ventricular tachycardia occasionally happens in people with no risk factors, people who are known to be at risk can take the following precautions, with a doctor’s supervision:
- Take beta-blockers to manage blood pressure.
- Take lidocaine, procainamide, or amiodarone to control heart rate.
- Treat other underlying conditions that might cause arrhythmia.
- Avoid substances, such as caffeine, cocaine, and alcohol, that can cause ventricular arrhythmia.
- Take steps to avoid heart disease, including maintaining a healthy weight and exercising appropriately.
- Take medicine to control blood pressure or cholesterol as prescribed by your physician.
- If you smoke, quit
American Association of Family Physicians
American Heart Association
Canadian Cardiovascular Society
Heart and Stroke Foundation of Canada
Hebbar A, Hueston W. Management of common arrhythmias: part II. Am Fam Physician . 2002 Jun 15;65. Available at: http://www.aafp.org/afp/20020615/2491.html . Accessed June 26, 2007.
Ventricular tachycardia. American Heart Association website. Available at: http://www.americanheart.org/presenter.jhtml?identifier=64 . Accessed June 28, 2007.
Ventricular tachycardia. EBSCO DynaMed website. Available at: http://dynamed101.ebscohost.com/Detail.aspx?id=115268 . Accessed June 28, 2007.
Last reviewed November 2008 by
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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