Ventricular extrasystoles are extra heartbeats that start in the lower chambers of the heart, disrupting the usual rhythm and sometimes creating the sensation of a skipped beat or flutter in the chest. While these irregular heartbeats are surprisingly common and usually harmless in healthy people, understanding when they might signal something more serious can help you know when to seek medical advice.

How Common Are Ventricular Extrasystoles?

Ventricular extrasystoles, also known as premature ventricular contractions or PVCs, are far more widespread than many people realize. Research shows that up to 75% of people experience these extra heartbeats at some point in their lives.^[6] Studies using continuous heart monitoring over 24 hours have found that more than 60% of healthy individuals have ventricular extrasystoles, even when they feel perfectly fine.^[5]

The frequency of these extra beats tends to increase as we get older. They are slightly more common in men than women, and also appear more often in African-Americans.^[13] What makes ventricular extrasystoles particularly interesting is that most people who have them never even know it. The majority of cases are discovered accidentally during routine medical examinations or heart tests performed for completely different reasons.^[2]

When doctors look at how many of these extra beats occur over a full day, they consider fewer than 5,000 beats in 24 hours to be a low burden. This might sound like a large number, but it represents only about 5% of your total heartbeats during a typical day.^[19] A moderate burden ranges from 5,000 to just under 10,000 beats, while a high burden extends from 10,000 to nearly 20,000. Anything over 20,000 extrasystoles in a day is considered a very high burden.^[19]

What Causes These Extra Heartbeats?

Your heart normally beats because of electrical signals that begin in a specialized cluster of cells in the upper right chamber, called the sinoatrial node. This signal travels through your heart in an organized way, telling first the upper chambers and then the lower chambers to contract. With ventricular extrasystoles, the electrical signal starts prematurely from the lower chambers, called the ventricles, instead of following the usual pathway.^[6]

The exact reason why these early beats happen is not always clear, especially in people who are otherwise healthy. However, several factors are known to trigger or increase their frequency. Lifestyle choices play a significant role: consuming too much caffeine from coffee, tea, or energy drinks can provoke extra beats, as can smoking and drinking alcohol.^[5] Physical and emotional stress, anxiety, lack of sleep, and intense exercise in some individuals can also bring them on.^[5]

Certain medications may contribute to ventricular extrasystoles as well. Over-the-counter nasal decongestants, some antihistamines, and drugs that stimulate the heart can increase their occurrence.^[5] Imbalances in the body’s minerals, particularly low levels of potassium or magnesium, can disrupt the heart’s electrical system and lead to extra beats.^[6] Hormonal changes during pregnancy or the menstrual cycle, as well as dehydration, may also play a part.^[5]

In some cases, ventricular extrasystoles occur alongside existing heart conditions. These include coronary artery disease, where the blood vessels supplying the heart become narrowed; previous heart attacks; diseases of the heart muscle known as cardiomyopathies; heart valve problems; inflammation of the heart muscle called myocarditis; and conditions present from birth.^[5] Even after experiencing a heart attack, the scar tissue left behind can create abnormal electrical pathways that generate extra beats.^[6]

Who Is at Higher Risk?

While ventricular extrasystoles can affect anyone at any age, certain groups face a higher likelihood of experiencing them. Older adults are particularly prone to these extra heartbeats, with the frequency increasing steadily with age.^[6] People who already have heart disease face greater risks, especially those with heart failure, high blood pressure that has affected the heart, or a history of heart attacks.^[6]

Individuals with specific heart conditions are more susceptible. Those who have hypertrophic cardiomyopathy, a condition where the heart muscle becomes abnormally thick, often experience more frequent extrasystoles. Similarly, people with heart failure or reduced heart function are at increased risk.^[6] Anyone with low levels of potassium or magnesium in their blood, whether from diet, medications, or other health issues, may notice more irregular heartbeats.^[13]

Lifestyle factors significantly influence your risk. People who consume large amounts of caffeine, smoke tobacco, drink alcohol regularly, or lead highly stressful lives tend to experience more ventricular extrasystoles. Those who don’t get enough sleep or push themselves too hard during physical activity without proper preparation may also notice these extra beats more often.^[5]

What Do Ventricular Extrasystoles Feel Like?

Many people with ventricular extrasystoles never feel anything unusual at all. When symptoms do occur, they are usually described as sensations in the chest rather than pain. The most common feeling is that of palpitations, which people often describe as their heart fluttering, pounding, or jumping inside their chest.^[1] Some describe it as feeling like their heart skipped a beat or missed a beat entirely.^[1]

The sensation comes from the sequence of events that happens during an extrasystole. First, there’s a premature beat that may feel weak or go unnoticed. This is followed by a brief pause, and then the next normal beat comes in more forcefully than usual. This “premature beat followed by a pause and then a strong beat” pattern creates the characteristic feeling that something unusual just happened in your chest.^[5] Some people also feel a strong pulsation in their neck during these episodes.^[6]

When symptoms do appear, they might include dizziness, a sensation of being close to fainting, or an increased awareness of your heartbeat.^[6] In people who already have heart problems, ventricular extrasystoles may cause shortness of breath or make it harder to breathe comfortably.^[6] Some individuals report feeling tired or experiencing a general sense of weakness, particularly when the extra beats occur frequently.^[4]

The variability in how people experience ventricular extrasystoles is striking. Two people with the same number of extra beats might have completely different experiences. One might feel every single irregular beat and find it distressing, while the other might go about their day completely unaware that anything unusual is happening with their heart.^[5]

Can Ventricular Extrasystoles Be Prevented?

While you cannot always prevent ventricular extrasystoles entirely, you can take several practical steps to reduce their frequency and severity. The first and most important approach is to identify and avoid the triggers that seem to bring on your extra beats. Keeping a diary of when you notice palpitations and what you were doing, eating, or drinking beforehand can help you spot patterns.^[7]

Reducing or eliminating stimulating substances makes a significant difference for many people. This means cutting back on coffee, tea, energy drinks, and other sources of caffeine. If you smoke, quitting tobacco can help reduce the frequency of extra beats. Similarly, limiting alcohol consumption or avoiding it completely often leads to fewer symptoms.^[5] For some people, even chocolate or certain medications like decongestants can trigger episodes, so paying attention to these potential culprits is worthwhile.^[7]

Managing stress plays a crucial role in prevention. Chronic stress and anxiety are well-known triggers for ventricular extrasystoles. Finding healthy ways to cope with stress, whether through relaxation techniques, regular exercise, adequate sleep, or speaking with a counselor, can help reduce the frequency of extra beats.^[5] Getting enough rest is particularly important, as fatigue and lack of sleep can make extrasystoles worse.^[5]

Maintaining a healthy diet helps keep your heart’s electrical system functioning smoothly. Eating foods rich in potassium and magnesium, such as bananas, leafy greens, nuts, and whole grains, can help prevent the mineral imbalances that sometimes trigger extra beats.^[5] Staying well-hydrated is also important, as dehydration can contribute to irregular heartbeats.^[5]

Regular physical activity, done at a moderate and comfortable pace, often helps reduce ventricular extrasystoles over time. However, it’s important to build up your fitness level gradually rather than suddenly taking on very intense exercise, which can sometimes trigger extra beats in people who aren’t accustomed to it.^[5]

How the Heart Changes During Ventricular Extrasystoles

Understanding what happens in your heart during a ventricular extrasystole helps explain why these beats feel different and why they sometimes matter medically. In a normal heartbeat, the electrical signal originates in the sinoatrial node and travels in an organized way through both upper chambers, then down to both lower chambers. This coordination ensures that the upper chambers, called atria, contract first to fill the ventricles with blood, and then the ventricles contract together to pump blood out to the body and lungs.^[6]

With a ventricular extrasystole, the electrical signal bypasses this normal pathway. Instead of starting at the top of the heart, the signal originates somewhere in the ventricular muscle itself. Because this impulse doesn’t travel through the heart’s specialized conduction system, it spreads more slowly through the ordinary heart muscle tissue.^[8] This slower, less organized spread of electrical activity produces a wider pattern on an electrocardiogram, or ECG, which is how doctors identify these beats.^[8]

The premature contraction happens before the ventricles have had time to fill completely with blood from the atria. As a result, when the ventricles contract early, there is less blood to pump out, and the pulse felt at the wrist may be weak or even absent during that beat.^[13] This is why examining a patient with a hand on their pulse while listening to their heart can reveal that some heart sounds don’t produce a corresponding pulse, a classic sign of ventricular extrasystoles.^[13]

After the premature beat, there is typically a pause called a compensatory pause. This happens because the heart’s natural pacemaker resets its timing. The next normal beat then occurs with the ventricles more fully filled with blood than usual, producing a stronger-than-normal contraction. This stronger beat is often what people feel most noticeably, creating the sensation that their heart just gave a particularly forceful thump.^[5]

When ventricular extrasystoles occur very frequently over months or years, they can begin to affect how well the heart pumps. This happens because the heart is repeatedly contracting inefficiently. In some cases, this can lead to a condition called PVC-induced cardiomyopathy, where the heart muscle becomes weakened and the heart’s pumping function declines.^[8] The encouraging news is that this type of heart muscle weakening is often reversible when the ventricular extrasystoles are successfully treated.^[8]

Interestingly, recent studies have shown that very frequent ventricular extrasystoles, generally more than 10,000 per day, can lead to reduced heart function even in people who had no previous heart disease.^[5] However, this is not inevitable, and many people with frequent extrasystoles never develop any problems with their heart’s pumping ability. The relationship between extra beats and heart function appears to depend on individual factors that researchers are still working to understand fully.^[4]