Ventricular Fibrillation

Definition

Ventricular fibrillation is when the lower heart chambers contract in a fast, uneven way. As a result, little or no blood is pumped from the heart. Without fast medical care, it can lead to sudden death.

Blood Flow Through Heart.

Ventricles are lower area of red and blue sections

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Causes

Causes of ventricular fibrillation include:

• Inadequate blood flow to the heart due to coronary artery disease (CAD)
• Scar tissue within the heart due to past harm to the heart, such as a heart attack
• Heart failure
• Infection of the heart muscle— myocarditis
• Shock
• Electrical shock
• Near-drowning
• Dangerously low body temperature— hypothermia
• Electrolyte imbalance
• Drugs that affect the currents of the heart such as sodium or potassium channel blockers
• Low atmospheric oxygen

Risk Factors

Ventricular fibrillation is more common in older people. It is most commonly linked to CAD. Things that raise the risk of CAD will also raise the risk of ventricular fibrillation. These include:

• Heart problems, such as:
  • Heart failure
  • Heart arrhythmias —especially multiple premature ventricular beats
  • Past heart attack
  • Past ventricular fibrillation
• High blood pressure
• Diabetes
• Certain habits, such as
  • Smoking
  • Excessive use of alcohol
  • Drug abuse
  • A high-fat diet
• Stress
• High cholesterol
• Obesity
• A family history of cardiovascular disease

Symptoms

Ventricular fibrillation happens without warning. Symptoms may include:

• Loss of consciousness within seconds
• Sudden collapse
• Seizures
• Loss of color in the skin
• Large pupils in the eyes
• No detectable pulse, heartbeat, or blood pressure

Diagnosis

Ventricular fibrillation is suspected when a person collapses suddenly and has no detectable pulse or heartbeat. The diagnosis is confirmed by ECG . An ECG records the heart’s activity.

Treatment

Ventricular fibrillation is an emergency. Treatment must be given within 4 to 6 minutes. It includes:

Prevention

To help reduce the risk of ventricular fibrillation:

• Lower the risk of CAD:
  • Eat a healthful diet. It should be low in saturated fat and rich in whole grains, fruits, and vegetables.
  • Exercise regularly.
  • If overweight, talk to the doctor about how to lose weight safely.
  • If you smoke, talk to the doctor about how to quit.
• Avoid or limit caffeine, alcohol, and other substances that may contribute to uneven heartbeats and heart disease.
• Learn to manage stress.
• See the doctor if there is a family history of this condition.

Those at high risk for this condition may be able to get an ICD. It will be surgically placed in the chest to stop ventricular fibrillation. Special drugs may also be given. The drugs try to prevent a future episode.