If you want to learn about supraventricular tachycardia (SVT), go to the topic Reference Supraventricular Tachycardia.
What is ventricular tachycardia?
Ventricular tachycardia is a fast heart rhythm that starts in the lower part of the heart (ventricles). If left untreated, some forms of ventricular tachycardia may get worse and lead to ventricular fibrillation, which can be life-threatening.
Ventricular tachycardia is a fast but regular rhythm. It can lead to ventricular fibrillation which is fast and irregular. With ventricular fibrillation, the heart beats are so fast and irregular that the heart stops pumping blood. Ventricular fibrillation is a leading cause of sudden cardiac death.
What causes ventricular tachycardia?
Sometimes it is not known what causes ventricular tachycardia, especially when it occurs in young people. But in most cases ventricular tachycardia is caused by heart disease, such as a previous Reference heart attack Opens New Window, a Reference congenital heart defect Opens New Window, Reference hypertrophic or dilated cardiomyopathy, or Reference myocarditis Opens New Window. Sometimes ventricular tachycardia occurs after heart surgery. Inherited heart rhythm problems, such as long QT syndrome or Brugada syndrome, are rare causes of ventricular tachycardia.
Some medicines—including Reference antiarrhythmic medicines Opens New Window, which are used to treat other types of abnormal heart rhythms—can cause ventricular tachycardia. Less common causes include blood imbalances, such as low Reference potassium Opens New Window levels and other Reference electrolyte imbalances Opens New Window.
Nonprescription decongestants, herbal remedies (especially those that contain ma huang or ephedra), diet pills, and "pep" pills often contain stimulants that can trigger episodes of ventricular tachycardia. Illegal drugs (such as stimulants, like cocaine) also may cause ventricular tachycardia. It is important to be aware of which substances have an effect on you and how to avoid them.
What are the symptoms?
In ventricular tachycardia, the heart beats too rapidly and the ventricles cannot effectively pump oxygen-rich blood to the rest of the body. Ventricular tachycardia can be life-threatening.
- Reference Palpitations Opens New Window, an uncomfortable awareness of the heart beating rapidly or irregularly.
- Reference Dizziness Opens New Window or Reference lightheadedness Opens New Window.
- Shortness of breath.
- Chest pain, or Reference angina Opens New Window.
- Near-fainting or fainting (Reference syncope Opens New Window).
- Weak pulse or no pulse.
This heart rhythm is dangerous for most people. If it lasts more than just a few seconds, it can turn into ventricular fibrillation which causes sudden death.
How is ventricular tachycardia diagnosed?
If an Reference electrocardiogram (EKG, ECG) can be done while ventricular tachycardia is occurring, it often provides the most useful information. An electrocardiogram is a tracing of the electrical activity of your heart. It is usually done along with a history and physical exam, lab tests, and a Reference chest X-ray Opens New Window.
Because ventricular tachycardia can occur intermittently and may not always be captured by an EKG at the doctor's office, you may be asked to use a portable EKG to record your heart rhythm on a continuous basis, usually over a 24-hour period. This is referred to by several names, including Reference ambulatory electrocardiography, ambulatory EKG, Holter monitoring, 24-hour EKG, or cardiac event monitoring.
Your doctor may recommend further tests, including an echocardiogram, to evaluate your heart's function, a stress test or coronary angiogram to determine whether a part of the heart is not getting enough blood, and/or an Reference electrophysiology (EP) study. An EP study can locate specific areas of heart tissue that give rise to abnormal electrical impulses, which may be causing the ventricular tachycardia. This information is used to determine the best treatment.
How is it treated?
If you are having symptoms and are in a sustained tachycardia, it is a medical emergency. You will need immediate treatment. You may need Reference CPR Opens New Window or a shock from an automatic defibrillator (also known as an AED). Paramedics or your doctor may try intravenous medicines or Reference electrical cardioversion to return your heart to a normal rhythm.
To prevent the arrhythmia from recurring, you may need to take Reference antiarrhythmic medicines.
Your doctor might recommend an implanted device, called an Reference implantable cardioverter defibrillator (ICD). An ICD can detect an abnormal heart rhythm and restore a normal rhythm.
In some cases a procedure called Reference catheter ablation is used to destroy small areas of heart tissue responsible for the arrhythmia. Catheter ablation might make the arrhythmia happen less often or stop the arrhythmia from happening again.Reference 1
It is very important that any causes of ventricular tachycardia be identified and treated, if possible. For example, if the ventricular tachycardia results from a medicine, the medicine needs to be stopped.
What precautions should you take?
Call 911 or other emergency services immediately if you have palpitations, dizziness, near-fainting, or chest pain.
Talk with your doctor before changing your diet. If you want to lose weight, do not use diets that rely on a liquid-based program or a high-protein regimen. These types of diets can affect the concentrations of electrolytes in your blood. This can, in turn, cause problems with your heart.
Ask your doctor Reference when you can drive again. If you have had an episode of ventricular tachycardia or ventricular fibrillation, your doctor may recommend that you don't drive a car for a few months. This precaution is to make sure you don't have any other episodes that could make driving unsafe. Right after you get an ICD implanted, you will not drive for at least a few days.
Travel safely. It is safe for most people with arrhythmias to travel. Plan ahead to Reference travel safely. For example, plan to wear a medical alert bracelet and to bring enough medicine for the length of your trip.
Know how to Reference Reference live well with an ICD. This includes getting your device checked regularly, avoiding strong electric or magnetic fields, exercising safely, and knowing what to do if you get a shock.
|By:||Reference Healthwise Staff||Last Revised: Reference August 9, 2012|
|Medical Review:||Reference Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology
Reference John M. Miller, MD, FACC - Cardiology, Electrophysiology