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Cardiac Arrhythmias – Causes, Symptoms and Treatment

Cardiac arrhythmias are irregularities in the normal heartbeat rhythm. They range from harmless to life-threatening and always require medical evaluation.

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Things worth knowing about "Cardiac Arrhythmias"

Cardiac arrhythmias are irregularities in the normal heartbeat rhythm. They range from harmless to life-threatening and always require medical evaluation.

What Are Cardiac Arrhythmias?

Cardiac arrhythmias are disturbances in the normal electrical rhythm of the heart. The heart may beat too fast, too slow, irregularly, or in an abnormal sequence. A healthy resting heart beats between 60 and 100 times per minute in a regular pattern. When this rhythm deviates persistently or in episodes, it is referred to as an arrhythmia.

Causes

Cardiac arrhythmias can arise from a wide range of causes:

Heart disease: Coronary artery disease, heart failure, valve disorders, or a previous heart attack can disrupt the electrical conduction system of the heart.
Electrolyte imbalances: Abnormal levels of potassium, magnesium, or calcium in the blood can interfere with heart function.
Thyroid disorders: Both an overactive and an underactive thyroid gland can affect heart rhythm.
Medications: Certain drugs, including antiarrhythmics, antidepressants, and digoxin preparations, may themselves trigger arrhythmias.
Lifestyle factors: Stress, excessive caffeine or alcohol intake, sleep deprivation, and smoking can contribute to rhythm disturbances.
Congenital heart defects: Structural abnormalities of the heart present from birth may affect the electrical pathways.

Symptoms

Symptoms vary widely depending on the type and severity of the arrhythmia:

Rapid or irregular heartbeat (palpitations)
Slow or skipping pulse
Dizziness or lightheadedness
Shortness of breath
Chest pain or pressure
Fainting episodes (syncope)
Fatigue and reduced exercise tolerance

In some cases, arrhythmias cause no symptoms at all and are discovered incidentally during a routine examination.

Diagnosis

Diagnosis of cardiac arrhythmias involves several tests:

ECG (Electrocardiogram): The primary diagnostic tool, which records the electrical activity of the heart.
Holter Monitor: A portable device that continuously records heart rhythm over 24 to 48 hours or longer.
Echocardiography: An ultrasound examination of the heart to assess structure and function.
Blood tests: To evaluate electrolyte levels, thyroid function, and other markers.
Exercise stress test: Monitoring of heart activity during physical exertion.
Electrophysiology study (EPS): An invasive procedure to examine the electrical pathways within the heart in detail.

Treatment

Treatment depends on the type, cause, and severity of the arrhythmia:

Medication

Antiarrhythmic drugs such as beta-blockers, calcium channel blockers, or flecainide help regulate heart rhythm. Anticoagulants (blood thinners) are also used in conditions like atrial fibrillation to reduce the risk of stroke.

Electrical Cardioversion

A controlled electrical shock (cardioversion) can be used to restore a normal heart rhythm in certain types of arrhythmia.

Catheter Ablation

In catheter ablation, abnormal electrical pathways in the heart are destroyed using heat or cold energy delivered through a thin tube (catheter), with the goal of permanently eliminating the arrhythmia.

Pacemakers and ICDs

A pacemaker is implanted to treat abnormally slow heart rates (bradycardia). An implantable cardioverter-defibrillator (ICD) detects life-threatening arrhythmias and delivers an electrical shock to restore normal rhythm when needed.

Lifestyle Modifications

Regular physical activity, reducing alcohol and caffeine consumption, managing stress, and quitting smoking can all help reduce the frequency and severity of arrhythmias.

When to See a Doctor

Seek immediate medical attention or call emergency services if you experience sudden severe palpitations, fainting, persistent chest pain, or difficulty breathing. Recurrent mild symptoms should also be evaluated by a doctor without delay.

References

Zipes DP et al. - ACC/AHA/ESC 2006 Guidelines for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death. Circulation. 2006;114(10):e385-484.
Kirchhof P et al. - 2016 ESC Guidelines for the management of atrial fibrillation. European Heart Journal. 2016;37(38):2893-2962.
January CT et al. - 2019 AHA/ACC/HRS Focused Update of the 2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation. Journal of the American College of Cardiology. 2019;74(1):104-132.

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