Heart Conditions — Arrhythmia
Ectopic Heartbeats
Ectopic beats are extra heartbeats that arise outside the heart's normal electrical pathway, creating a characteristic sensation of a skipped beat followed by a heavy thump. They are very common and usually benign — but investigation is often warranted.
Understanding Extra Heartbeats
What Are Ectopic Beats?
The heart's electrical system is controlled by the sino-atrial node — a natural pacemaker in the right atrium. In a normal heartbeat, the signal travels in an orderly sequence through defined pathways to coordinate upper and lower chamber contraction.
An ectopic beat occurs when any heart cell generates a sufficient electrical impulse before the normal pathway triggers — a premature beat arising out of sequence. A compensatory pause typically follows as the heart resets, making the next normal beat feel particularly forceful.
Ectopic beats are extremely common. They occur in most people at some point, particularly during stress or stimulant intake, and are often completely benign. However, frequent ectopics — particularly from the lower chambers — warrant investigation and occasionally treatment.
"A skipped beat or flutter, followed by a pause — then a heavy thump as the heart gets back on track. That is the classic experience of an ectopic beat."
The Two Main Types
PACs & PVCs
Ectopic beats are classified by the chamber from which they originate — the upper chambers (atria) or the lower chambers (ventricles). This distinction determines their significance and potential impact.
Upper Chambers
PAC
Premature Atrial Contraction
PACs originate within the atria. They are generally benign and experienced as a flutter or brief irregular sensation. They are extremely common and present in most people at some point.
Very high levels of PACs may predict the future development of atrial fibrillation — particularly when they cluster into brief runs. This warrants closer monitoring, though intervention is rarely needed for PACs alone.
On the ECG, a PAC shows an early P-wave of different morphology to the normal sinus beat, usually followed by a normal QRS complex.
Lower Chambers
PVC
Premature Ventricular Contraction
PVCs originate within the ventricles. They are often felt more strongly than atrial ectopics due to the more powerful ventricular contraction. Most are completely benign in patients with structurally normal hearts.
However, a very high burden of PVCs (typically above 15–20% of total beats) can, over time, cause heart muscle weakening — a form of arrhythmia-induced cardiomyopathy. In these cases, treatment is warranted even without troublesome symptoms.
PVCs in the context of coronary artery disease require careful assessment, as they may indicate electrical instability in scarred heart tissue.
How They Present
Symptoms & Triggers
The sensations vary between patients. Many describe a jump, flutter, or brief pause in the chest. Others notice only the subsequent heavy compensatory beat. Some patients experience mild dizziness or a fleeting faintness during particularly forceful ectopics.
Importantly, many people with frequent ectopic beats — sometimes thousands per day — have no symptoms at all, and the ectopics are discovered only on a monitor worn for another reason.
Common triggers include:
Investigation
Tests for Ectopic Beats
The key aims of investigation are to confirm the type of ectopic, quantify its burden, and exclude any underlying structural heart disease that would change the significance and treatment.
ECG
Identifies the morphology of ectopics if present at the time. Distinguishes PACs from PVCs and detects underlying conduction abnormalities.
Holter Monitor
24-hour or longer ambulatory recording. Quantifies total ectopic burden — expressed as a percentage of total daily beats — and identifies runs or pairs.
Echocardiogram
Assesses heart structure and pumping function. High-burden PVCs can cause muscle weakening — the echo detects this early before symptoms develop.
Exercise Stress Test
Ectopics that increase markedly with exercise — particularly PVCs — may indicate underlying coronary disease and warrant further investigation.
CT Coronary Angiogram
Non-invasive imaging of the coronary arteries to exclude significant underlying coronary disease in selected patients with ventricular ectopics.
Cardiac MRI
Identifies subtle scarring or myocardial disease invisible on echocardiography, particularly relevant when PVC burden is high or the origin is unusual.
Management
Treating Ectopic Beats
Many patients require no specific treatment — reassurance that ectopics are benign and lifestyle modification is often sufficient. Intervention is reserved for those with a high burden, troublesome symptoms, or evidence of cardiac impact.
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Reassurance & Monitoring
For patients with confirmed low-burden benign ectopics and a structurally normal heart, reassurance is the most appropriate initial management. Understanding what ectopics are significantly reduces anxiety.
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Lifestyle Modification
Reducing caffeine, alcohol, and smoking; improving sleep; managing stress; and increasing regular moderate exercise can all significantly reduce ectopic frequency in susceptible patients.
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Medication
Beta-blockers reduce ectopic frequency and the forceful compensatory beat in patients with troublesome symptoms. They are generally well-tolerated and can be used long-term.
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Catheter Ablation
For patients with a high PVC burden causing heart muscle weakening, or severely symptomatic patients who have not responded to medication, catheter ablation can eliminate the ectopic focus with high success rates.
When to Seek Advice
"Most ectopic beats are entirely benign — but the only way to be certain is a proper assessment."
Seek a cardiology assessment if your ectopics are frequent, prolonged, accompanied by dizziness or near-fainting, or if you have a family history of sudden cardiac death or inherited heart conditions.
Related Conditions
Further Reading
Experiencing ectopic beats?
Dr Nijjer provides expert assessment of ectopic beats at 68 Harley Street, including ambulatory ECG monitoring and echocardiography, to confirm whether your ectopics are benign and whether any treatment is warranted.