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Fibrillation – Causes, Symptoms and Treatment
Fibrillation is an uncontrolled, chaotic quivering of heart muscle cells that disrupts normal heart rhythm and can lead to life-threatening cardiac emergencies.
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Fibrillation is an uncontrolled, chaotic quivering of heart muscle cells that disrupts normal heart rhythm and can lead to life-threatening cardiac emergencies.
What Is Fibrillation?
Fibrillation refers to the rapid, irregular, and uncoordinated contraction of heart muscle fibers that prevents the heart from pumping blood effectively. There are two main clinically relevant forms: atrial fibrillation (AF), affecting the upper chambers of the heart, and ventricular fibrillation (VF), affecting the lower chambers. While atrial fibrillation is a chronic but manageable condition, ventricular fibrillation is a medical emergency requiring immediate intervention.
Causes
Fibrillation can be triggered by a variety of underlying conditions and risk factors:
- Cardiovascular disease: Coronary artery disease, heart attack, heart failure
- High blood pressure (hypertension)
- Heart valve disorders
- Inflammatory heart conditions: Myocarditis, pericarditis
- Electrolyte imbalances: Low or high potassium, low magnesium
- Thyroid disorders: Particularly hyperthyroidism
- Excessive alcohol or drug use
- Severe emotional or physical stress
- Idiopathic: No identifiable cause
Symptoms
The symptoms of fibrillation differ depending on the type:
Atrial Fibrillation
- Rapid or irregular heartbeat (palpitations)
- Dizziness or lightheadedness
- Shortness of breath, especially during exertion
- Chest pain or pressure
- Increased risk of stroke due to blood clot formation in the heart
Ventricular Fibrillation
- Sudden loss of consciousness
- Absence of pulse and cessation of breathing
- Constitutes cardiac arrest and is fatal without immediate treatment
Diagnosis
Key diagnostic tools include:
- Electrocardiogram (ECG): The gold standard for detecting arrhythmias; atrial fibrillation appears as absent P-waves with irregular RR intervals
- Holter monitor: Continuous ECG recording over 24 to 48 hours to capture intermittent episodes
- Echocardiography: Ultrasound assessment of cardiac structure and function
- Blood tests: Thyroid function, electrolytes, complete blood count
- Imaging: CT or MRI when structural heart disease is suspected
Treatment
Treatment depends on the type and severity of fibrillation:
Atrial Fibrillation
- Antiarrhythmic medications: Such as flecainide or amiodarone to restore and maintain normal rhythm
- Rate control: Beta-blockers or calcium channel blockers to slow the heart rate
- Anticoagulation therapy: Blood thinners (e.g., apixaban, rivaroxaban, warfarin) to reduce stroke risk
- Cardioversion: Electrical or pharmacological restoration of normal sinus rhythm
- Catheter ablation: Targeted destruction of arrhythmia-causing tissue in the heart
Ventricular Fibrillation
- Immediate defibrillation: An electric shock to restore normal heart rhythm
- Cardiopulmonary resuscitation (CPR) until defibrillation is available
- Implantable cardioverter-defibrillator (ICD): A device implanted in the chest to automatically treat future episodes
- Treatment of the underlying condition
Prognosis and Prevention
With appropriate management, many people with atrial fibrillation can live normal lives, though the risk of stroke remains elevated. Ventricular fibrillation is fatal within minutes without immediate treatment. Prevention focuses on maintaining a heart-healthy lifestyle, managing risk factors such as high blood pressure and diabetes, and attending regular cardiac check-ups.
References
- Kirchhof P. et al. - ESC Guidelines for the management of atrial fibrillation. European Heart Journal, 2020.
- Zipes DP, Wellens HJ. - Sudden cardiac death. Circulation, 1998; 98(21): 2334-2351.
- World Health Organization (WHO) - Cardiovascular diseases (CVDs). Fact sheet, 2021. Available at: https://www.who.int
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