Ectopic Heartbeats (PVCs and PACs) in Singapore: Causes, Symptoms and Treatment

Ectopic heartbeats are extra beats that briefly interrupt your heart’s normal rhythm, often felt as a skipped beat, a flutter or a thud in the chest. They are one of the most common reasons people in Singapore see a cardiologist about palpitations, and in the great majority of cases they are harmless. This page explains what ectopic beats are, the difference between PVCs and PACs, common triggers, how they are diagnosed and counted, and when treatment is needed. It is general information and not a substitute for advice from your own doctor.

What Are Ectopic Heartbeats?

An ectopic heartbeat is a beat that starts from an electrical impulse outside the heart’s normal pacemaker (the sinus node). The early beat is usually followed by a brief pause, and the next normal beat can feel stronger than usual – which is why many people describe a “skipped” beat followed by a thump.

There are two main types:

• Premature ventricular contractions (PVCs) – extra beats arising from the lower chambers of the heart (the ventricles). These are the most common type seen in clinic.
• Premature atrial contractions (PACs) – extra beats arising from the upper chambers (the atria).

Almost everyone has occasional ectopic beats; most people simply never feel them. They become noticeable when they are frequent, when they occur at rest (especially at night, when the heart rate is slow and the mind is quiet), or during periods of stress.

Ectopic Heartbeat Symptoms

Many people with ectopic beats have no symptoms at all. When symptoms occur, they may include:

• A skipped or “missed” beat, followed by a stronger thump
• Fluttering or a brief irregular sensation in the chest
• A pounding awareness of the heartbeat, often when lying on the left side at night
• Momentary light-headedness with runs of frequent ectopics
• Anxiety about the sensations themselves, which can make the beats more noticeable

Symptoms often come and go over weeks or months. They are typically more obvious at rest than during exercise – ectopic beats that get clearly worse with exertion deserve proper assessment.

When to Seek Emergency Help

Ectopic beats on their own are rarely an emergency. Call 995 if palpitations occur together with:

• Fainting or near-fainting, especially during exercise
• Chest pain or pressure
• Severe breathlessness
• A sustained racing or chaotic heartbeat that does not settle

Causes and Risk Factors

In most people no underlying heart disease is found, and the beats are triggered or worsened by everyday factors:

• Caffeine – coffee, tea, energy drinks and some supplements
• Stress and anxiety – adrenaline makes the heart’s electrical tissue more excitable
• Sleep deprivation – a common trigger in shift workers and busy professionals
• Alcohol and nicotine
• Fever, dehydration or recent viral illness
• Electrolyte imbalance – low potassium or magnesium
• Thyroid problems – an overactive thyroid can increase ectopic beats
• Stimulant medications and recreational drugs

Less commonly, frequent ectopics are linked to an underlying condition such as coronary artery disease (narrowed heart arteries), heart valve disease, cardiomyopathy (heart muscle disease) or other heart rhythm disorders such as atrial fibrillation, which PACs can occasionally herald. Part of the cardiologist’s job is to rule these out.

How Ectopic Heartbeats Are Diagnosed

• Electrocardiogram (ECG) – a resting electrocardiogram (ECG) records the heart’s electrical activity for a few seconds and can capture ectopic beats if they happen during the recording, as well as showing the baseline rhythm.
• 24-hour Holter monitor – because ectopics come and go, a 24-hour Holter monitor is the key test. It records every heartbeat over a full day and counts exactly how many ectopic beats occur – the “ectopic burden”, expressed as a percentage of all beats. A burden under about 1% is very common and usually insignificant; a burden above roughly 10-15% is considered high and needs closer attention. Longer 7-day or patch recordings are used if symptoms are infrequent – our separate Holter monitor test guide explains the options.
• Echocardiogram – an echocardiogram (an ultrasound scan of the heart) checks that the heart muscle and valves are structurally normal, which is the main factor determining whether ectopics matter.
• Blood tests – thyroid function and electrolytes.
• Treadmill (exercise stress) test – if symptoms occur with exertion.

Treatment Options

Treatment depends on symptoms, ectopic burden and whether the heart is structurally normal.

• Reassurance and trigger control – for most people with a normal heart and low burden, no medical treatment is needed. Cutting back on caffeine and alcohol, improving sleep, staying hydrated and managing stress often reduce the beats noticeably.
• Medication – if symptoms are intrusive, beta-blockers or calcium channel blockers (drug classes that calm the heart’s electrical activity) can help reduce the frequency or awareness of ectopic beats. Anti-arrhythmic medication is occasionally used in selected cases.
• Catheter ablation – when the burden is very high, symptoms are significant, or frequent PVCs are starting to weaken the heart muscle (a reversible condition called PVC-induced cardiomyopathy), a catheter ablation procedure can target and treat the small area of tissue producing the extra beats.

Living With Ectopic Heartbeats

For most people the outlook is excellent. Ectopic beats in a structurally normal heart do not shorten life expectancy, and normal exercise is encouraged rather than restricted. Many patients find symptoms fade once they understand the beats are benign – anxiety and hyper-awareness are a large part of the experience. A follow-up Holter may be arranged if symptoms change or if the initial burden was high.

When to See a Cardiologist

See a cardiologist if skipped or extra beats are frequent, persistent or affecting your daily life, if they occur with dizziness, breathlessness or chest discomfort, or if you have a family history of heart disease or sudden death. Assessment is straightforward and usually settles the question of whether the beats are harmless within one or two visits.

Frequently Asked Questions

Are ectopic heartbeats dangerous?

In a structurally normal heart, occasional ectopic beats are almost always harmless and do not shorten life. They deserve closer assessment when they are very frequent, occur with fainting or exertional symptoms, or when there is underlying heart disease.

How many ectopic beats a day is normal?

Almost everyone has some ectopic beats daily, and a burden below about 1% of total beats is very common. A Holter monitor gives an exact count; burdens above roughly 10-15% warrant closer follow-up because they can occasionally weaken the heart muscle over time.

Can caffeine and stress really cause skipped heartbeats?

Yes. Caffeine, stress hormones and sleep deprivation all make the heart’s electrical tissue more excitable, and they are among the most common triggers. Many people improve simply by reducing coffee and energy drinks and sleeping better.

Do ectopic heartbeats go away on their own?

Often, yes. Ectopics tend to come in phases and frequently settle once triggers such as stress, poor sleep or excess caffeine are addressed. If they persist or worsen, a review and repeat monitoring are sensible.

What is the difference between PVCs and PACs?

PVCs arise from the heart’s lower chambers and PACs from the upper chambers. Both feel similar and both are usually benign, though frequent PACs can occasionally be linked to atrial fibrillation, so the distinction on an ECG or Holter recording is useful.