Ventricular fibrillation
VF; Fibrillation - ventricular; Arrhythmia - VF; Abnormal heart rhythm - VF; Cardiac arrest - VF; Defibrillator - VF; Cardioversion - VF; Defibrillate - VFVentricular fibrillation (VF) is a severely abnormal heart rhythm (arrhythmia) that is life threatening.
Arrhythmia
An arrhythmia is a disorder of the heart rate (pulse) or heart rhythm. The heart can beat too fast (tachycardia), too slow (bradycardia), or irregul...
Read Article Now Book Mark ArticleCauses
The heart pumps blood to the lungs, brain, and other organs. If the heartbeat is interrupted, even for a few seconds, it can lead to fainting (syncope) or cardiac arrest.
Fibrillation is an uncontrolled twitching or quivering of muscle fibers (fibrils). When it occurs in the lower chambers of the heart, it is called VF. During VF, blood is not pumped from the heart. Sudden cardiac death results.
The most common cause of VF is a heart attack. However, VF can occur whenever the heart muscle does not get enough oxygen. Conditions that can lead to VF include:
- Electrocution accidents or injury to the heart
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Heart attack or angina
Heart attack
Most heart attacks are caused by a blood clot that blocks one of the coronary arteries. The coronary arteries bring blood and oxygen to the heart. ...
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Heart disease that is present at birth (congenital)
Heart disease that is present at birth ...
Congenital heart disease (CHD) is a problem with the heart's structure and function that is present at birth.
Read Article Now Book Mark Article - Heart muscle disease in which the heart muscle becomes weakened and stretched or thickened
Heart muscle becomes weakened and stret...
Cardiomyopathy is disease in which the heart muscle becomes weakened, stretched, or has another structural problem. It often contributes to the hear...
Read Article Now Book Mark ArticleThickened
Hypertrophic cardiomyopathy (HCM) is a condition in which the heart muscle becomes thick. Sometimes, only one part of the heart is thicker than the ...
Read Article Now Book Mark Article - Heart surgery
- Sudden cardiac death (commotio cordis); most often occurs in athletes who have had a sudden blow to the area directly over the heart
- Medicines
- Very high or very low potassium levels in the blood
Many people with VF have no history of heart disease. However, they often have heart disease risk factors, such as smoking, high blood pressure, and diabetes.
Symptoms
A person who has a VF episode will suddenly collapse and become unconscious. This happens because the brain and muscles are not receiving blood from the heart.
The following symptoms may occur within minutes to 1 hour before the collapse:
- Chest pain
- Dizziness
- Nausea
- Rapid or irregular heartbeat (palpitations)
Palpitations
Palpitations are feelings or sensations that your heart is pounding or racing. They can be felt in your chest, throat, or neck. You may:Have an unpl...
Read Article Now Book Mark Article - Shortness of breath
Exams and Tests
A cardiac monitor will show a very disorganized ("chaotic") heart rhythm.
Tests will be done to look for the cause of the VF.
Treatment
VF is a medical emergency. It must be treated immediately to save a person's life.
Call 911 or the local emergency number for help if a person who is having a VF episode collapses at home or becomes unconscious.
- While waiting for help, place the person's head and neck in line with the rest of the body to help make breathing easier. Start CPR by doing chest compressions in the center of the chest ("push hard and push fast"). Compressions should be delivered at the rate of 100 to 120 times per minute. Compressions should be done to a depth of at least 2 inches (5 cm) but no more than 2 ¼ inches (6 cm).
CPR
CPR stands for cardiopulmonary resuscitation. It is an emergency life-saving procedure that is done when someone's breathing or heartbeat has stoppe...
Read Article Now Book Mark Article - Continue to do this until the person becomes alert or help arrives.
VF is treated by delivering a quick electric shock through the chest. It is done using a device called an external defibrillator. The electric shock can immediately restore the heartbeat to a normal rhythm, and should be done as quickly as possible. Many public places now have these machines.
Medicines may be given to control the heartbeat and heart function.
An implantable cardioverter defibrillator (ICD) is a device that can be implanted in the chest wall of people who are at risk for this serious rhythm disorder The ICD detects the dangerous heart rhythm and quickly sends a shock to correct it. It is a good idea for family members and friends of people who have had VF and heart disease to take a CPR course. CPR courses are available through the American Red Cross, hospitals, or the American Heart Association.
Implantable cardioverter defibrillator
An implantable cardioverter-defibrillator (ICD) is a device that detects a life-threatening, rapid heartbeat. This abnormal heartbeat is called an a...
Read Article Now Book Mark ArticleOutlook (Prognosis)
VF will lead to death within a few minutes unless it is treated quickly and properly. Even then, long-term survival for people who live through a VF attack outside of the hospital is low.
Possible Complications
People who have survived VF may be in a coma or have long-term brain or other organ damage.
References
Al-Khatib SM, Stevenson WG, Ackerman MJ, et al. 2017 AHA/ACC/HRS Guideline for management of patients with ventricular arrhythmias and the prevention of sudden cardiac death: a report of the American College of Cardiology/American Heart Association Task Force on clinical practice guidelines and the Heart Rhythm Society [published correction appears in J Am Coll Cardiol. 2018;72(14):1760]. J Am Coll Cardiol. 2018;72(14):1677-1749. PMID: 29097294 pubmed.ncbi.nlm.nih.gov/29097294/.
Epstein EF, DiMarco JP, Ellenbogen KA, Estes NA 3rd, et al. 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2013;661(3):e6-75. PMID: 23265327 pubmed.ncbi.nlm.nih.gov/23265327/.
Garan H. Ventricular arrhythmias. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 53.
Stevenson WG, Keppenfeld K. Ventricular arrhythmias. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 67.
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Ventricular fibrillation and tachycardia
Animation
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Heart - section through the middle - illustration
The interior of the heart is composed of valves, chambers, and associated vessels.
Heart - section through the middle
illustration
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Heart - front view - illustration
The external structures of the heart include the ventricles, atria, arteries and veins. Arteries carry blood away from the heart while veins carry blood into the heart. The vessels colored blue indicate the transport of blood with relatively low content of oxygen and high content of carbon dioxide. The vessels colored red indicate the transport of blood with relatively high content of oxygen and low content of carbon dioxide.
Heart - front view
illustration
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Heart - section through the middle - illustration
The interior of the heart is composed of valves, chambers, and associated vessels.
Heart - section through the middle
illustration
-
Heart - front view - illustration
The external structures of the heart include the ventricles, atria, arteries and veins. Arteries carry blood away from the heart while veins carry blood into the heart. The vessels colored blue indicate the transport of blood with relatively low content of oxygen and high content of carbon dioxide. The vessels colored red indicate the transport of blood with relatively high content of oxygen and low content of carbon dioxide.
Heart - front view
illustration
Review Date: 5/27/2024
Reviewed By: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.