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Ventricular tachycardia (VT) is a type of fast heart rhythm that starts in the lower part of the heart (ventricles). The heart beats more than 100 beats per minute.
Some forms of VT may get worse and lead to ventricular fibrillation, which can be life-threatening. With ventricular fibrillation, the heartbeats are very fast and irregular. Ventricular fibrillation may cause cardiac arrest. In cardiac arrest, the heart stops pumping blood to the body. Cardiac arrest can cause sudden cardiac death.
Sometimes it's not known what causes VT. But in most cases, it's caused by heart disease. This includes having a previous heart attack or congenital heart disease. It also includes hypertrophic cardiomyopathy, dilated cardiomyopathy, and myocarditis. Sometimes VT occurs after heart surgery. Inherited heart rhythm problems can also cause VT. These include long QT syndrome and Brugada syndrome.
Some medicines can cause VT. These include antiarrhythmic medicines, other heart medicines, and antibiotics. Less common causes include blood imbalances. Examples are low potassium levels and other electrolyte imbalances.
Herbal remedies that contain ephedra, also known as ma huang, can trigger VT. Drugs (such as stimulants, like cocaine) also may cause it.
VT may not cause symptoms. When it does, you may feel dizzy or light-headed. You may have shortness of breath and chest pain or pressure. You may have palpitations. These are an uncomfortable awareness of the heart beating very fast or not in a regular way. Or you may faint or nearly faint.
Your doctor will do an exam and ask about your past health.
Your doctor will also do an electrocardiogram (EKG, ECG). This is a tracing of the electrical activity of your heart. VT can come and go. It may be hard to capture with an EKG at your doctor's office. So the doctor may want you to wear a heart monitor. It records your heart rhythm over a few days or longer.
You may have lab tests and a chest X-ray.
Your doctor may also recommend other tests, such as:
The results of these tests can help your doctor decide what treatment options you have.
To prevent VT and relieve symptoms, you may take heart rhythm medicines.
Some people may have a catheter ablation. This procedure destroys small areas of heart tissue that cause the irregular heartbeat. It may make VT happen less often. Or it may stop VT from happening again.
Your doctor may recommend a device that can prevent sudden death. It can detect a life-threatening abnormal heartbeat and help restore a normal rhythm. This device might be implanted (ICD, or implantable cardioverter-defibrillator). Or it might be worn as a vest.
If you have VT that won't stop, it's a medical emergency. You may need a shock to try to get your heart back into a normal rhythm. This can be from an automated external defibrillator (AED), by paramedics, or through treatment in an emergency room. A doctor may give you medicines if your condition is stable.
Current as of: September 7, 2022
Author: Healthwise StaffClinical Review Board: Rakesh K. Pai MD, FACC - Cardiology, ElectrophysiologyMartin J. Gabica MD - Family MedicineE. Gregory Thompson MD - Internal MedicineAdam Husney MD - Family MedicineJohn M. Miller MD, FACC - Cardiology, ElectrophysiologyKara L. Cadwallader MD - Family Medicine
Current as of: September 7, 2022
Author: Healthwise Staff
Medical Review:Rakesh K. Pai MD, FACC - Cardiology, Electrophysiology & Martin J. Gabica MD - Family Medicine & E. Gregory Thompson MD - Internal Medicine & Adam Husney MD - Family Medicine & John M. Miller MD, FACC - Cardiology, Electrophysiology & Kara L. Cadwallader MD - Family Medicine
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