The heart beats approximately 100,000 times every day. For most people, this happens automatically and invisibly, with the heart maintaining a steady, coordinated rhythm that they are rarely aware of.
When that rhythm is disrupted – when the heart beats too fast, too slowly, or irregularly – the result is an arrhythmia. Some arrhythmias are harmless. Others are a significant risk to health, increasing the likelihood of stroke, heart failure, and sudden cardiac death.
Understanding which arrhythmias matter, how they are diagnosed, and what the treatment options are is increasingly important for Sri Lankan patients, in whom cardiovascular disease – including rhythm disorders – is rising rapidly.
What Are Heart Rhythm Disorders?
The heart’s rhythm is generated and coordinated by a specialised electrical system. At the top of the heart sits the sinoatrial (SA) node – the heart’s natural pacemaker – which fires electrical impulses at a rate of 60 to 100 times per minute at rest. These impulses travel in an organised sequence through the heart’s chambers, causing them to contract in the correct order.
An arrhythmia occurs when this electrical system is disrupted – either in how impulses are generated, how they travel through the heart, or both.
Arrhythmias can originate from any part of the heart. They can cause the heart to beat too fast (tachycardia), too slowly (bradycardia), or irregularly – and they can range from inconsequential to life-threatening.
The Most Common Arrhythmias Sri Lankan Patients Should Know
Atrial Fibrillation (AF)
The most common sustained cardiac arrhythmia globally. In atrial fibrillation, the upper chambers of the heart (the atria) fire chaotically at rates of 300 to 600 impulses per minute, instead of the single coordinated impulse from the SA node. The ventricles receive these chaotic impulses through the AV node and respond with an irregular, often rapid, heart rate.
The result is an irregularly irregular heartbeat that many patients describe as a fluttering, racing, or pounding sensation in the chest – though a significant proportion of AF patients have no symptoms at all and are diagnosed incidentally.
Atrial Flutter
Similar to AF but more organised – the atria beat rapidly but in a coordinated circular pattern, typically at around 300 beats per minute. The ventricles usually respond to every second flutter wave, producing a ventricular rate of approximately 150 beats per minute. Often coexists with atrial fibrillation and shares similar stroke risk.
Supraventricular Tachycardia (SVT)
A group of arrhythmias arising from above the ventricles, causing episodes of rapid heart rate – typically 150 to 250 beats per minute – that start and stop suddenly. Often described by patients as a sudden racing of the heart that stops as abruptly as it began. Generally not directly life-threatening, but episodes can be significantly symptomatic and debilitating.
Ventricular Tachycardia (VT)
A rapid arrhythmia originating from the ventricles – the main pumping chambers. Can cause significant haemodynamic compromise and degenerate into ventricular fibrillation. A potentially life-threatening rhythm disorder, particularly in patients with underlying structural heart disease.
Ventricular Fibrillation (VF)
The most dangerous arrhythmia – the ventricles quiver chaotically and fail to pump blood effectively. Causes sudden cardiac arrest and is fatal within minutes without immediate defibrillation (electric shock to restore normal rhythm).
Bradycardia and Heart Block
Abnormally slow heart rates (bradycardia) or failure of electrical impulses to travel normally from the atria to the ventricles (heart block) cause the heart to beat too slowly to maintain adequate circulation. Symptoms include dizziness, lightheadedness, fainting, and breathlessness. Often treated with a pacemaker.
Atrial Fibrillation: Why It Is More Dangerous Than It Feels
Atrial fibrillation deserves particular attention because it is common, often underdiagnosed, and carries consequences that are far more serious than its symptoms might suggest.
The Stroke Risk
In AF, the chaotic electrical activity in the atria causes the atrial muscle to quiver rather than contract effectively. Blood pools in the atria – particularly in a small pouch called the left atrial appendage – and pooled blood tends to clot. If a clot forms and breaks off, it can travel through the circulation to the brain, causing a stroke.
Patients with untreated AF have a risk of stroke that is five times higher than patients without AF. AF-related strokes tend to be more severe than other stroke types, and are associated with higher rates of death and permanent disability.
This stroke risk exists whether or not the patient has symptoms from the AF. A patient who feels no palpitations and is not aware of their AF is at the same stroke risk as a symptomatic patient with the same AF pattern.
Atrial Fibrillation and Heart Failure
AF reduces the efficiency of the heart’s pumping function, because the loss of coordinated atrial contraction reduces the filling of the ventricles before each beat. Over time, particularly when AF causes a rapid ventricular rate, the continuous strain on the heart muscle can lead to a form of heart failure called tachycardia-induced cardiomyopathy. Effective rate or rhythm control can reverse this in many cases.
Progression
AF tends to progress. Paroxysmal AF (episodes that come and go and terminate spontaneously) can progress to persistent AF (episodes that do not terminate without treatment) and eventually to permanent AF. Earlier treatment – particularly rhythm control using catheter ablation – is associated with better long-term outcomes and may modify the natural progression of the disease.
What Are the Symptoms of a Heart Rhythm Disorder?
Symptoms vary by arrhythmia type and by individual patient:
- Palpitations – a sensation of the heart beating irregularly, rapidly, or forcefully. Can feel like fluttering, pounding, racing, or skipping beats
- Breathlessness – particularly during physical activity or during an arrhythmia episode
- Dizziness or lightheadedness – particularly with bradyarrhythmias
- Fainting (syncope) – sudden loss of consciousness, which may be the presenting feature of a serious arrhythmia such as ventricular tachycardia or significant bradycardia
- Chest tightness or discomfort during episodes
- Fatigue – persistent unexplained fatigue can be a feature of AF, particularly when associated with a rapid ventricular rate
- Reduced exercise tolerance – an inability to sustain activity at a previously normal level
Importantly, as noted above, AF can be completely asymptomatic. Some patients are diagnosed only after a stroke, or incidentally during a routine ECG or examination for another reason. This is one reason why opportunistic AF screening – taking a pulse or ECG during a routine medical contact – is valuable.
How Are Arrhythmias Diagnosed?
Electrocardiogram (ECG)
The 12-lead ECG is the primary tool for diagnosing arrhythmias. Each arrhythmia has a characteristic ECG pattern that allows identification. A 12-lead ECG captures the heart’s electrical activity over a few seconds.
However, many arrhythmias are paroxysmal – occurring intermittently rather than continuously. A normal ECG recorded between episodes does not exclude an arrhythmia.
Holter Monitor
A portable ECG device worn continuously for 24 to 48 hours (or longer) that records the heart’s rhythm throughout the monitoring period. Captures arrhythmias that occur during normal daily activities. The patient records symptoms in a diary so that any rhythm changes can be correlated with symptoms.
Extended Ambulatory Monitoring
For arrhythmias that occur less frequently – every few weeks or months – a 24 to 48-hour Holter monitor is unlikely to capture an episode. Extended monitoring options include:
- 7 to 30-day patch monitors – adhesive ECG recorders worn for an extended period
- Event recorders – activated by the patient when symptoms occur, transmitting the ECG for review
- Implantable loop recorder (ILR) – a small device implanted under the skin that continuously records the heart’s rhythm for up to three years. Used when arrhythmia is strongly suspected but has not been captured on shorter monitoring. Particularly valuable for investigating unexplained syncope
Echocardiography
Not primarily an arrhythmia diagnosis tool, but essential for assessing cardiac structure and function in all patients with significant arrhythmias. Identifies underlying structural heart disease that may be contributing to the arrhythmia and guides treatment decisions.
Electrophysiology Study (EP Study)
An invasive investigation performed in a cardiac catheterisation laboratory, in which catheters with recording electrodes are placed within the heart’s chambers to map the electrical activity in detail. The EP study can locate the origin of an arrhythmia with precision and can be followed immediately by catheter ablation treatment.
What Are the Treatment Options for Arrhythmias?
Rate Control
For atrial fibrillation and atrial flutter, if complete rhythm restoration is not immediately feasible or appropriate, slowing the ventricular rate to a more normal range improves symptoms and prevents the tachycardia-induced heart failure that results from sustained rapid rates.
Medications used for rate control include beta-blockers, calcium channel blockers (diltiazem and verapamil), and digoxin.
Rhythm Control
Restoring and maintaining normal sinus rhythm – as opposed to simply controlling the rate in AF – is associated with better quality of life, reduced symptoms, and in longer-term studies, potentially better cardiac outcomes.
Rhythm control options include:
- Electrical cardioversion – a controlled electric shock delivered under brief anaesthesia that resets the heart’s rhythm to normal. Effective at restoring sinus rhythm but does not prevent recurrence
- Anti-arrhythmic medications – medications that suppress the electrical triggers for AF and help maintain sinus rhythm after cardioversion. Commonly used agents include flecainide, propafenone, sotalol, amiodarone, and dronedarone
- Catheter ablation – the most effective method for rhythm control in AF, discussed in detail below
Anticoagulation for Stroke Prevention
For patients with AF who have a significant stroke risk (assessed using the CHA2DS2-VASc score), anticoagulation – blood-thinning medication – is the most important treatment intervention, regardless of whether rate or rhythm control is chosen.
Modern direct oral anticoagulants (DOACs) – apixaban, rivaroxaban, dabigatran, edoxaban – have largely replaced warfarin for AF stroke prevention. They do not require regular INR monitoring, have fewer food and drug interactions, and have a lower risk of serious bleeding complications.
Left atrial appendage occlusion (LAAO) – a catheter-based procedure that closes off the left atrial appendage, where most AF-related clots form – is an option for patients who cannot take anticoagulation.
Catheter Ablation: A Closer Look
Catheter ablation has transformed the management of arrhythmias over the past two decades. It is now the preferred treatment for many types of arrhythmia, offering the possibility of cure rather than simply controlling symptoms with long-term medication.
How It Works
Thin catheters with ablation capability are inserted through blood vessels in the groin and guided to the heart under imaging. The catheters map the heart’s electrical activity to identify the abnormal pathways or tissue generating the arrhythmia. Energy – typically radiofrequency energy or cryoenergy (extreme cold) – is then delivered through the catheter tip to destroy the small area of tissue responsible for the arrhythmia.
Ablation for Atrial Fibrillation (Pulmonary Vein Isolation)
In most cases of AF, the arrhythmia is triggered by electrical impulses arising from within or near the pulmonary veins – the vessels that return oxygenated blood from the lungs to the left atrium. AF ablation involves electrically isolating the pulmonary veins from the rest of the left atrium (pulmonary vein isolation, or PVI), preventing these triggers from initiating AF.
Success rates for AF ablation in paroxysmal AF are approximately 70 to 80 percent freedom from AF at one year after a single procedure. A proportion of patients require a repeat procedure. Long-term success rates continue to improve with advances in ablation technology and technique.
Ablation for SVT and Atrial Flutter
For supraventricular tachycardias (SVT) and atrial flutter, ablation targets the specific accessory pathway or abnormal circuit causing the arrhythmia. Success rates are very high – typically above 90 percent – and the procedure is generally curative with a low recurrence rate.
Ventricular Tachycardia Ablation
For patients with recurrent ventricular tachycardia, particularly those with underlying structural heart disease, catheter ablation targeting the scar tissue or abnormal circuits responsible for the VT can reduce arrhythmia burden and the need for ICD shocks.
Devices for Rhythm Management: Pacemakers, ICDs, and CRT
Pacemakers
An implanted electronic device that monitors the heart’s rhythm and delivers an electrical stimulus when the heart rate falls below a set threshold. Used for bradyarrhythmias – abnormally slow heart rates or heart block. Discussed in detail in our article on pacemakers and living with one.
Implantable Cardioverter-Defibrillator (ICD)
An ICD is a device similar to a pacemaker but with the additional capability to deliver a high-energy shock to terminate life-threatening ventricular arrhythmias (VT or VF). Used in patients at high risk of sudden cardiac death – including those who have survived a cardiac arrest, and those with significantly impaired heart function (low ejection fraction) due to heart failure or cardiomyopathy.
Cardiac Resynchronisation Therapy (CRT)
A specialised form of pacemaker therapy used in patients with heart failure whose hearts have a delayed, dyssynchronous contraction pattern due to electrical conduction abnormalities. CRT coordinates the contraction of both ventricles, improving the heart’s efficiency and reducing heart failure symptoms. Often combined with ICD capability in one device (CRT-D).
Atrial Fibrillation and Stroke Prevention
For Sri Lankan patients with AF, stroke prevention is the most clinically urgent aspect of management. The following points are important:
- All patients with AF should have their stroke risk assessed using the CHA2DS2-VASc score. This score assigns points for common risk factors – age over 65, hypertension, diabetes, heart failure, prior stroke or TIA, vascular disease, and female sex
- Patients with a score of 2 or more (men) or 3 or more (women) should be on anticoagulation unless there is a clear contraindication
- The decision about anticoagulation should be made in discussion with a cardiologist and should not be deferred indefinitely
Sri Lankan patients with AF who are not currently on anticoagulation – or who are on warfarin but have poorly controlled INR levels – should discuss their current management with a cardiologist. The availability of DOACs has made stroke prevention simpler and safer than it was in the era of warfarin-only anticoagulation.
Why Do Sri Lankan Patients Choose India for Arrhythmia Treatment?
- Dedicated electrophysiology programme at Amrita Hospitals with experienced electrophysiologists performing the full range of diagnostic EP studies and ablation procedures
- High-volume catheter ablation – AF ablation, SVT ablation, atrial flutter ablation, and VT ablation, with modern three-dimensional electro-anatomical mapping systems that significantly improve ablation accuracy
- Full device implantation programme – pacemakers, ICDs, CRT-D devices, and leadless pacemakers
- Left atrial appendage occlusion (LAAO) for patients with AF who cannot take anticoagulation
- Implantable loop recorder implantation and remote monitoring for unexplained palpitations and syncope
- One-hour flight from Colombo – making timely access to specialist electrophysiology care genuinely practical
- Coordinated patient pathway – Amrita Info Centre Sri Lanka manages the process from initial report review to return home after treatment
For patients who also have underlying structural heart disease – such as coronary artery disease or valve disease – contributing to their arrhythmia, our articles on bypass surgery vs angioplasty for Sri Lankan patients and heart valve repair in India for Sri Lankan patients provide relevant context on the broader cardiac care available at Amrita Hospitals.
To explore the full range of cardiac services available, visit cardiac electrophysiology and rhythm treatment in India.
How Do Sri Lankan Patients Access Arrhythmia Treatment at Amrita Hospitals?
- Gather your existing investigations – ECG reports, Holter monitor results, echocardiography, and specialist letters from cardiologists in Sri Lanka
- Share these with Amrita Info Centre Sri Lanka for forwarding to the electrophysiology team at Amrita Hospitals
- Receive an initial assessment on the nature of the arrhythmia, the recommended investigation and treatment approach, and the appropriate timing
- Confirm your appointment and travel arrangements
- Apply for your medical visa with support from our team
For guidance on visa documentation, our article on the Complete Guide to Medical Visa for India from Sri Lanka covers every step.
Frequently Asked Questions
Is atrial fibrillation dangerous even if I have no symptoms? Yes. The stroke risk associated with AF does not depend on whether the patient is symptomatic. Asymptomatic AF carries the same stroke risk as symptomatic AF in patients with the same risk factor profile. Anticoagulation decisions are based on stroke risk score, not on symptom burden.
Can AF be cured? Catheter ablation (pulmonary vein isolation) can achieve long-term freedom from AF in a significant proportion of patients – approximately 70 to 80 percent after a single procedure for paroxysmal AF. Some patients require a repeat procedure. Complete cure – permanent freedom from AF without medication – is achievable in many cases, particularly when the AF is paroxysmal and ablation is performed before the arrhythmia has become long-standing.
Is catheter ablation safe? Catheter ablation is performed by experienced electrophysiologists and is associated with a low rate of serious complications. The most significant risks include cardiac tamponade (fluid around the heart), pulmonary vein stenosis (narrowing of the pulmonary veins), and stroke. These are uncommon at experienced high-volume centres. Your electrophysiologist will discuss the specific risks relevant to your case.
What is the difference between a pacemaker and a defibrillator? A pacemaker monitors the heart rate and delivers small electrical stimuli to maintain an adequate rate when the heart beats too slowly. A defibrillator (ICD) has this pacemaker function but additionally monitors for life-threatening fast rhythms and can deliver a high-energy shock to terminate them. ICDs are used in patients at risk of sudden cardiac death.
Can I travel with AF? Most patients with well-managed AF – on anticoagulation and with adequate rate or rhythm control – can travel normally, including by air. The key consideration is ensuring that anticoagulation is maintained without interruption during travel, and that adequate medication supply is carried. Discuss travel plans with your cardiologist before any significant trip.
What dietary or lifestyle changes help with AF management? Excess alcohol is a well-established trigger for AF episodes and should be minimised or eliminated. Obesity increases AF risk and progression, so weight management is important. Obstructive sleep apnoea is closely linked to AF – if you snore heavily or have been told you stop breathing during sleep, evaluation for sleep apnoea is worthwhile. Regular moderate aerobic exercise is beneficial for overall cardiac health but very high-intensity endurance exercise (marathon running, ultra-endurance sport) is associated with increased AF risk.
Conclusion
Heart rhythm disorders – and atrial fibrillation in particular – are a significant and growing health challenge for Sri Lankan patients. The consequences of undiagnosed or undertreated AF, including stroke and heart failure, are serious and preventable with appropriate management.
For Sri Lankan patients with known or suspected arrhythmias, Amrita Hospitals provides a full electrophysiology programme – from diagnostic EP studies and catheter ablation to device implantation and long-term rhythm monitoring – supported by coordinated patient access through Amrita Info Centre Sri Lanka.
The first step is a specialist cardiac assessment. That process can begin today, from Colombo