Arrhythmia (Irregular Heartbeat)

An arrhythmia is a problem with the heart’s rate or rhythm. Also called a cardiac arrhythmia, cardiac dysrhythmia, or irregular heartbeat, it can cause the heart to beat too slowly, too quickly, or in an unsteady pattern. Some abnormal heart rhythms are harmless, while others need medical assessment and treatment.

People may notice heart palpitations, a racing heartbeat, skipped beats, dizziness, tiredness, chest discomfort, or shortness of breath. In some cases, an arrhythmia causes no noticeable symptoms and is identified during a routine medical examination or cardiac screening.

This guide explains the main types of arrhythmia, common symptoms, causes, diagnostic tests, treatment options, and when urgent medical care is needed.

What is an Arrhythmia?

An arrhythmia is an abnormal heart beat caused by a problem in the heart’s electrical system. Normally, electrical signals travel through the heart in an organised pattern, allowing the heart muscle to contract and pump blood efficiently.

When these signals are too fast, too slow, delayed, or disorganised, the heart may not beat effectively. An arrhythmia can begin in the upper chambers of the heart, called the atria, or the lower chambers, called the ventricles. Some heart arrhythmias occur only occasionally, while others are ongoing.

Arrhythmias may involve:

• A heart rate that is too fast, called tachycardia
• A heart rate that is too slow, called bradycardia
• Early beats, also called premature beats
• An irregularly irregular rhythm, where the time between heartbeats has no repeating pattern, most commonly seen in atrial fibrillation
• A delay or interruption in the heart’s electrical pathways, known as conduction block or heart block

The seriousness of an arrhythmia depends on its type, how often it occurs, the symptoms it causes, and whether the person has an underlying heart condition. Some require monitoring only, while others need medication, catheter treatment, a device, or emergency care.

What Causes Arrhythmia?

Arrhythmia can develop when the heart’s electrical system is affected by heart disease, changes in the heart muscle, medicines, or other health conditions. In some people, no clear cause is found, and the arrhythmia is described as idiopathic.

Structural Heart Conditions

Many arrhythmias are related to structural heart problems. Coronary artery disease or a previous heart attack can damage the heart muscle and create areas where electrical signals travel abnormally. Heart failure, heart valve disease, or heart muscle disease can stretch or scar the heart chambers, making abnormal rhythms more likely. Atrial fibrillation is particularly common in people with mitral valve disease because the enlarged left atrium makes abnormal rhythms more likely.

Other Medical Conditions

Other health conditions can also affect the heart’s rhythm. High blood pressure increases the workload on the heart and may lead to thickening of the heart muscle. Thyroid disease (hypothyroidism or hyperthyroidism) can speed up or slow down the heart rate. Diabetes and sleep apnea are associated with a higher risk of atrial fibrillation and other rhythm problems.

Electrolyte imbalances, such as low or high levels of minerals in the blood like potassium, magnesium, or calcium, can interfere with the heart’s electrical signals. Dehydration, fever, or severe illness may also trigger temporary arrhythmias by changing fluid balance and stress hormones.

Lifestyle Factors and Medicines

Lifestyle factors play an important role. Alcohol, smoking, drugs, or excessive caffeine intake can provoke palpitations or sustained arrhythmias in some people. Some prescription or over-the-counter medicines, including certain cold remedies, asthma inhalers, diet pills, or heart medications, may affect heart rate or rhythm.

Emotional and physical stress can contribute to arrhythmia. Stress, anxiety, or lack of sleep may increase adrenaline levels, which can make the heart beat faster or feel irregular. In some cases, arrhythmias occur during exercise, after heavy meals, or with sudden changes in body position.

Family History and Inherited Conditions

A family history of inherited heart conditions, such as long QT syndrome, Brugada syndrome, or certain types of cardiomyopathy, can increase the risk of arrhythmia. In these conditions, genetic changes affect the heart’s electrical proteins or structure.

Not every episode of a fast or irregular heartbeat means that a person has serious cardiovascular disease. However, new, recurrent, or worsening heart palpitations should be discussed with a healthcare professional, particularly when they occur with chest pain, fainting, or breathlessness.

Types of Arrhythmia

There are many types of cardiac arrhythmia. They are often grouped according to whether the heart beats too slowly, too quickly, or irregularly, and according to where the rhythm begins in the heart.

Bradycardia

Bradycardia means a slow heart rate, usually fewer than 60 beats per minute in adults. Sinus bradycardia is a type of bradycardia where the heart’s natural pacemaker, the sinus node, fires more slowly than usual, but the rhythm remains regular.

Sinus bradycardia can be normal in healthy, physically active people, especially during sleep. It may need treatment if it causes symptoms such as fainting, dizziness, unusual tiredness, confusion, shortness of breath, or reduced exercise ability.

Possible causes of bradycardia include:

• Age-related changes in the heart’s electrical system
• Medication that slows the heart rate
• Thyroid problems
• Heart disease or previous heart surgery
• Sleep apnea
• Electrolyte imbalance

Conduction Block (Heart Block)

Conduction block, also called heart block, happens when electrical signals travel too slowly or do not pass normally from the upper chambers to the lower chambers of the heart. The condition can range from mild to complete heart block.

Some forms of heart block cause no symptoms and only need observation. More severe block may slow the heart dangerously and can cause fainting, dizziness, or fatigue. In these cases, a pacemaker may be recommended to support a reliable heart rhythm.

Premature Beats

Premature beats are early heartbeats that interrupt the usual rhythm. They may feel like a skipped beat, flutter, thump, or brief pause followed by a stronger heartbeat.

Premature atrial contractions begin in the upper chambers of the heart. Premature ventricular contractions begin in the lower chambers and are often called PVCs. A PVC arrhythmia may be harmless in people with a structurally normal heart, but frequent or symptomatic premature ventricular contractions may require further assessment.

Premature beats can be triggered by stress, caffeine, alcohol, nicotine, poor sleep, dehydration, fever, or some medicines. They can also occur without an obvious trigger.

Sinus Arrhythmia

Sinus arrhythmia is a small, normal variation in heart rate that commonly happens with breathing. The heart rate may increase slightly during breathing in and decrease during breathing out. This type of sinus arrhythmia is particularly common in children and young adults and usually does not indicate heart disease.

A healthcare professional can determine whether an irregular rhythm is a normal variation or needs further investigation.

Atrial Fibrillation

Atrial fibrillation is one of the most common sustained heart rhythm disorders. During atrial fibrillation, the upper chambers of the heart beat in a rapid, disorganised way instead of contracting normally.

This can create an irregularly irregular rhythm, meaning there is no regular pattern between heartbeats. Some people experience a fast, fluttering, or pounding heartbeat, while others have few or no symptoms.

Atrial fibrillation can increase the risk of blood clots and stroke. Treatment may focus on slowing the heart rate, restoring or maintaining a normal rhythm, and reducing stroke risk with blood-thinning medication when appropriate.

Atrial Flutter

Atrial flutter is another rhythm problem that begins in the upper chambers of the heart. The atria beat rapidly in a more organised pattern than in atrial fibrillation, but the heart rate may still be fast and symptoms can be similar.

People with atrial flutter may experience heart palpitations, shortness of breath, tiredness, dizziness, or chest discomfort. Like atrial fibrillation, atrial flutter may increase stroke risk and should be assessed by a cardiology team.

Supraventricular Tachycardia

Supraventricular tachycardia, often called SVT, is a fast heart rhythm that starts above the ventricles. Episodes often begin and end suddenly and can cause a racing heartbeat, chest discomfort, light-headedness, breathlessness, or anxiety.

SVT is usually not life-threatening, but recurrent episodes can be distressing and may interfere with daily activities. Treatment may include techniques to slow the heart rate, medication, or catheter ablation to treat the abnormal electrical pathway.

Ventricular Tachycardia

Ventricular tachycardia is a fast rhythm that begins in the lower chambers of the heart. It can reduce the heart’s ability to pump blood effectively, especially when it lasts longer than a few seconds or occurs in someone with heart disease.

Symptoms may include severe palpitations, chest pain, breathlessness, dizziness, fainting, or collapse. Ventricular tachycardia requires urgent medical assessment because it can sometimes develop into ventricular fibrillation.

Ventricular Fibrillation

Ventricular fibrillation is a life-threatening cardiac arrhythmia in which the lower chambers quiver instead of pumping blood. This causes cardiac arrest and requires immediate emergency treatment with cardiopulmonary resuscitation and defibrillation.

Ventricular fibrillation may occur during or after a heart attack, in people with severe heart disease, or in those with certain inherited electrical conditions. An implantable cardioverter-defibrillator may be recommended for some people who are at high risk of recurrent dangerous rhythms.

Arrhythmia Symptoms

Arrhythmia symptoms vary widely. Some people notice every change in rhythm, while others have an irregular heartbeat without any clear symptoms. Symptoms may be brief, occasional, or persistent.

Common symptoms include:

• Heart palpitations, fluttering, pounding, or racing sensations
• A feeling that the heart has skipped or added a beat
• Slow pulse or rapid pulse
• Dizziness or light-headedness
• Fainting or near-fainting
• Shortness of breath
• Chest discomfort or pressure
• Unusual tiredness or weakness
• Reduced exercise tolerance
• Anxiety or a sense of unease during episodes

Emergency medical care is needed for chest pain, sudden severe shortness of breath, fainting, collapse, new weakness on one side of the body, or symptoms of a heart attack or stroke. Ventricular fibrillation and some forms of ventricular tachycardia are medical emergencies.

Diagnosing Arrhythmia

Arrhythmia diagnosis begins with a discussion about symptoms, medical history, medicines, family history, caffeine or alcohol use, and previous heart problems. A doctor will check pulse, blood pressure, heart sounds, and other signs of cardiovascular health.

An electrocardiogram, also called an ECG, records the heart’s electrical activity and can identify many types of arrhythmia. However, some rhythm problems come and go, so the ECG may appear normal between episodes.

Tests used to diagnose a cardiac arrhythmia may include:

• ECG
• Holter monitor, a portable ECG device usually worn for 24 to 48 hours
• Event monitor or longer-term heart-rhythm monitor
• Echocardiogram to examine heart structure and pumping function
• Blood tests, including thyroid function and electrolyte levels
• Exercise stress test
• Cardiac CT or MRI in selected cases
• Electrophysiology study to map electrical signals inside the heart

A Holter monitor is particularly helpful when palpitations, dizziness, or an irregular heartbeat occurs during daily activities but is not captured during a short ECG. The device records the rhythm continuously and can help identify the type and frequency of an abnormal heart beat.

Arrhythmia Treatment

Arrhythmia treatment depends on the type of rhythm problem, its cause, symptom severity, and the person’s overall heart health. Some arrhythmias only need monitoring and lifestyle changes, while others require medication or procedures.

Treatment options may include:

• Observation and regular follow-up for harmless or infrequent premature beats
• Lifestyle changes, such as reducing alcohol, caffeine, nicotine, and dehydration triggers
• Medication to control heart rate or rhythm
• Blood-thinning medication for selected people with atrial fibrillation or atrial flutter
• Electrical cardioversion to restore a normal rhythm
• Catheter ablation to treat a specific abnormal electrical pathway
• Pacemaker implantation for certain slow rhythms or heart block
• Implantable cardioverter-defibrillator treatment for people at risk of dangerous ventricular rhythms

For atrial fibrillation, treatment decisions also include an individual assessment of stroke and bleeding risk. A cardiologist may recommend rate-control medicine, rhythm-control treatment, catheter ablation, or anticoagulant medicine depending on the person’s symptoms and health needs.

Never stop, start, or change heart medication without medical advice. Medicines used for arrhythmia can affect heart rate, blood pressure, and other body systems, so regular follow-up may be needed.

Living With Arrhythmia

Many people with arrhythmia lead active lives with the right treatment and follow-up. Keeping a record of symptoms, possible triggers, pulse changes, and medication use can help the cardiology team understand the pattern of the heart rhythm problem.

Helpful self-care steps include:

• Take prescribed medication consistently
• Attend cardiology and cardiac screening appointments
• Limit alcohol and avoid smoking
• Ask a doctor about safe caffeine intake
• Stay hydrated, especially during illness or hot weather
• Manage blood pressure, cholesterol, diabetes, and sleep apnoea
• Follow individual advice about exercise and physical activity
• Seek support for anxiety or stress when symptoms affect daily life

People with an implanted pacemaker or defibrillator should attend regular device checks and carry their device identification card. The care team can explain safe use of mobile phones, security systems, exercise equipment, and medical imaging.

Cardiac Screening and Arrhythmia Treatment in Turkey at Medical Park

Medical Park Hospitals provide cardiac screening and arrhythmia treatment in Turkey for local and international patients with heart palpitations, irregular heartbeat, fainting, chest discomfort, or known risk factors for cardiac disease. Assessment may include ECG, Holter monitor testing, echocardiography, blood tests, exercise testing, and advanced cardiac imaging when appropriate.

Cardiology teams evaluate a wide range of rhythm conditions, including atrial fibrillation, atrial flutter, supraventricular tachycardia, premature ventricular contractions, bradycardia, heart block, and more complex ventricular arrhythmias. Treatment options may include medication, electrical cardioversion, catheter ablation, pacemaker or defibrillator implantation, and long-term rhythm management.

For international patients seeking arrhythmia assessment, cardiac screening, or specialist treatment in Turkey, Medical Park supports coordinated appointments, medical-record review, diagnostic evaluation, treatment planning, and follow-up guidance.