Wolff-Parkinson-White Syndrome Guide: Symptoms, Causes, Diagnosis, and Treatment
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
Wolff-Parkinson-White (WPW) syndrome is a heart condition present at birth. People with WPW have an extra electrical pathway between the heart's upper and lower chambers, and that extra route lets heart signals travel too fast. This guide explains what the extra pathway does, the symptoms it causes, how doctors find it, and the four-step treatment ladder that ranges from simple breathing actions to a curative procedure.
TL;DR
Wolff-Parkinson-White syndrome is a congenital heart condition in which an extra electrical pathway between the heart's upper and lower chambers makes the heart beat too fast. The most common symptom is a heart rate over 100 beats a minute, often driven by supraventricular tachycardia at 150 to 220 beats a minute. Episodes usually are not life-threatening, but serious heart problems can happen, and rarely the syndrome can lead to sudden cardiac death in children and young adults. Diagnosis relies on an ECG plus wearable monitors and an EP study, and treatment escalates from vagal maneuvers to medicines, cardioversion, and curative catheter ablation.
Quick Answer
What it is: A congenital heart condition (present at birth) with an extra electrical pathway between the upper and lower heart chambers that causes a fast heartbeat. It is also called preexcitation syndrome.
Main symptom: A heart rate over 100 beats a minute that starts suddenly, may last seconds or hours, and can happen during exercise or rest. The most common rhythm is supraventricular tachycardia, about 150 to 220 beats a minute.
What causes it: An extra electrical pathway present at birth that lets signals bypass the AV node, where they normally slow down. In most cases the cause is unknown; rarely it is inherited.
How it is diagnosed: An electrocardiogram (ECG) first, then a Holter monitor, an event recorder, or an electrophysiology (EP) study to map the heart's signals and confirm the diagnosis.
How it is treated: A four-step ladder: vagal maneuvers (coughing, bearing down, an ice pack on the face), medicines, cardioversion (an electric shock), and catheter ablation, which creates tiny scars that block the extra pathway. People with the extra pathway but no symptoms usually need no treatment.
What this guide is based on
This guide is based on specialist-reviewed hospital clinical guidance published June 19, 2026, and draws on heart rhythm references from the American Heart Association, the U.S. National Heart, Lung, and Blood Institute, Ferri's Clinical Advisor (2025), the peer-reviewed Heart Rhythm journal (2020), and internal medicine references accessed in 2025. See the full references at the end of this guide.
What is Wolff-Parkinson-White syndrome?
Wolff-Parkinson-White (WPW) syndrome is a heart condition present at birth. That makes it a congenital heart defect. People with WPW syndrome have an extra pathway for electrical signals to travel between the heart's upper and lower chambers, and this causes a fast heartbeat. Changes in the heartbeat can make it harder for the heart to work as it should.
WPW syndrome is fairly rare. The episodes of fast heartbeat it causes usually are not life-threatening, but serious heart problems can happen. Rarely, the syndrome may lead to sudden cardiac death in children and young adults.
Treatment may include special actions that slow the heart, medicines, a shock to the heart, or a procedure that stops the irregular heartbeats.
How does a typical heartbeat work?
To understand what goes wrong in WPW, it helps to know how the heart normally beats. The heart has four chambers: two upper chambers called the atria and two lower chambers called the ventricles.
Inside the upper right chamber sits a group of cells called the sinus node. The sinus node sends out the electrical impulse that starts each heartbeat. The signal moves across the upper chambers, then arrives at a group of cells called the atrioventricular (AV) node, where it usually slows down, before reaching the lower chambers. This causes the ventricles to squeeze and pump out blood.
In a typical heart, this signaling goes smoothly, and the resting heart rate is about 60 to 100 beats a minute. A heart rate over 100 beats a minute is called tachycardia.
What causes the extra pathway in WPW?
In WPW syndrome, an extra electrical pathway connects the upper and lower heart chambers. This lets heart signals go around the AV node. As a result, the heart signals do not slow down. The signals get excited, and the heart rate gets faster. The extra pathway can also cause heart signals to travel backward, so the heart beats out of rhythm.
WPW syndrome is present at birth, and researchers are not sure what causes most types of congenital heart defects. WPW may occur together with other congenital heart defects, such as Ebstein anomaly. Rarely, the syndrome is passed down through families, a form called inherited or familial WPW syndrome, which is linked to a thickened heart muscle called hypertrophic cardiomyopathy.
What are the symptoms?
The most common symptom of WPW syndrome is a heart rate greater than 100 beats a minute. The fast heartbeat can begin suddenly and may last a few seconds or hours. It may happen during exercise or while at rest.
The most common irregular heartbeat seen with WPW syndrome is supraventricular tachycardia (SVT). During SVT, the heart beats about 150 to 220 times a minute, though it can beat faster or slower. Some people with WPW syndrome also have a fast and chaotic rhythm called atrial fibrillation.
In general, symptoms of WPW syndrome include rapid, fluttering, or pounding heartbeats, chest pain, trouble breathing or shortness of breath, dizziness or lightheadedness, fainting, fatigue, and anxiety.
Symptoms in infants
Infants with WPW may show other signs, including blue or gray skin, lips, and nails, restlessness or crankiness, rapid breathing, and poor eating.
WPW pattern vs. WPW syndrome
Some people have the extra electrical pathway but never experience a fast heartbeat. This condition is called Wolff-Parkinson-White pattern. Healthcare professionals often find it by chance during a heart test, and these people usually need no treatment.
When should you get emergency care?
Many things can cause a fast heartbeat, and a faster pulse during exercise is normal. Still, a persistently fast heartbeat deserves a medical checkup to find the cause.
Call 911 or your local emergency number if any of the following last more than a few minutes: the feeling of a fast or pounding heartbeat, trouble breathing, or chest pain.
How is WPW syndrome diagnosed?
To diagnose WPW syndrome, a healthcare professional examines you, listens to your heart with a stethoscope, and asks about your medical history and symptoms. Tests then confirm the syndrome and look for an underlying cause.
Test | What it does |
Electrocardiogram (ECG or EKG) | A quick, painless test that measures the heart's electrical activity. Electrodes on the chest, and sometimes the arms and legs, connect to a computer that prints or displays the results. An ECG shows how fast or slow the heart is beating and can reveal patterns that suggest an extra electrical pathway |
Holter monitor | A small, portable ECG device worn for a day or two while you do your regular activities, recording the heart continuously |
Event recorder | A device worn for about 30 days that records only for a few minutes at a time, usually triggered when you push a button during symptoms; some devices record automatically when they detect an irregular heartbeat |
Electrophysiology (EP) study | One or more thin, flexible tubes called catheters are guided through a blood vessel, usually in the groin, to areas in the heart. Sensors on the catheter tips record the heart's electrical patterns and show how signals spread during each beat; this study distinguishes WPW syndrome from WPW pattern |
How is WPW syndrome treated?
Treatment depends on how often symptoms happen, how severe they are, and the type of irregular heartbeat causing the fast rate. People with the extra pathway but no symptoms (WPW pattern) usually do not need treatment. The two goals of treatment are to slow a fast heart rate when it happens and to prevent fast heartbeats.
Treatment | How it works |
Vagal maneuvers | Simple actions that slow the heartbeat by affecting the vagus nerve, which helps control the heartbeat. They include coughing, bearing down as if passing stool, and putting an ice pack on the face. Your healthcare team may ask you to do these specific actions when your heart beats too fast |
Medicines | If maneuvers do not stop the fast heartbeat, medicines may be given, sometimes by IV, to control the heart rate and restore the heart rhythm |
Cardioversion | Paddles or patches on the chest deliver an electric shock that helps reset the heart rhythm. It is usually done when vagal maneuvers and medicines do not work, and cardioversion can also be done with medicines |
Catheter ablation | A doctor guides one or more thin, flexible tubes called catheters into an artery, usually in the groin, and steers them to the heart. Sensors on the tips use heat or cold energy to create tiny scars that block irregular electrical signals and restore the heart's rhythm. Ablation may be done at the same time as other heart surgeries |
What lifestyle steps help at home?
If you have WPW syndrome or any type of heart disease, your healthcare team usually recommends following a heart-healthy lifestyle. The recommended steps are not smoking, eating a healthy diet, getting regular exercise, limiting or avoiding alcohol, staying away from caffeine and other stimulants, staying at a healthy weight, and managing stress.
Having a plan in place to manage your heart health can help you feel calmer and more in control when a fast heartbeat happens. Ask your healthcare professional how to take your pulse and what heart rate is right for you, when and how to use vagal maneuvers if they suit you, when to make an appointment for a checkup, and when to seek emergency care.
How should you prepare for your appointment?
People with WPW syndrome may be referred to a doctor trained in heart conditions present at birth, called a congenital cardiologist. Because there is often a lot to discuss, prepare ahead of time.
Bring a list of any symptoms, including ones that may not seem related to the heart, along with important personal information such as major stresses or recent life changes, all current medicines and their dosages including over-the-counter medicines, vitamins, and supplements, and the questions you want to ask. Useful questions include what is likely causing the fast heart rate, what tests are needed, what treatments can help, the risks of WPW syndrome, how often follow-up appointments are needed, whether diet or activities need to change, and how other conditions or medicines may affect the heart condition.
Expect the doctor to ask how severe the symptoms are, how often fast heartbeats occur, how long they last, whether exercise, stress, or caffeine seems to trigger them or make them worse, and whether there is a family history of irregular heartbeats or other heart disease.
What are the complications?
WPW syndrome has been linked to sudden cardiac death in children and young adults. This is rare, but it is why the condition warrants proper diagnosis and, when indicated, treatment. The fast heartbeats themselves are usually not life-threatening, yet serious heart problems can happen, which is why the episode-based warning signs described above deserve prompt medical attention.
Conclusion
Wolff-Parkinson-White syndrome is a congenital condition, but it is highly treatable. Most fast-heartbeat episodes are not dangerous, and the treatment ladder, from a simple cough to a curative catheter ablation, gives doctors effective options at every stage. If your heart races suddenly, pounds persistently, or is accompanied by chest pain or breathlessness, seek medical evaluation, and call emergency services if those symptoms last more than a few minutes.
This article is for general educational purposes only and is not medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions.
FAQ
What is Wolff-Parkinson-White syndrome?
WPW syndrome is a congenital heart condition, meaning it is present at birth, in which an extra electrical pathway between the heart's upper and lower chambers causes a fast heartbeat. It is fairly rare and is also called preexcitation syndrome.
What does WPW syndrome feel like?
The most common symptom is a heart rate over 100 beats a minute that begins suddenly and may last seconds or hours, during exercise or at rest. People often describe rapid, fluttering, or pounding heartbeats, plus chest pain, breathlessness, dizziness, fainting, fatigue, or anxiety.
Why does the heart beat so fast in WPW?
Heart signals normally slow down at a junction called the AV node. The extra pathway in WPW lets signals skip the AV node, so they do not slow down, get excited, and make the heart beat faster. Signals can also travel backward, putting the heart out of rhythm.
What heart rate is typical during a WPW episode?
The most common rhythm is supraventricular tachycardia, in which the heart beats about 150 to 220 times a minute, though it can go faster or slower. Some people also develop atrial fibrillation, a fast and chaotic rhythm.
Can WPW syndrome be inherited?
Rarely. In most cases the cause of the extra pathway is unknown. When the syndrome is passed down through families, it is called familial WPW and is linked to hypertrophic cardiomyopathy, a thickened heart muscle.
Is WPW syndrome dangerous?
Episodes of fast heartbeat usually are not life-threatening, but serious heart problems can happen, and WPW has been linked to sudden cardiac death in children and young adults, which is why evaluation and treatment matter.
Do people with WPW always need treatment?
No. People who have the extra pathway but no symptoms, called WPW pattern, usually need no treatment. Treatment decisions depend on how often symptoms occur, their severity, and the type of irregular rhythm.
What is the cure for WPW syndrome?
Catheter ablation is the closest treatment to a cure. A doctor guides thin tubes through a groin artery to the heart and uses heat or cold energy to create tiny scars that block the extra electrical pathway and restore the normal rhythm.
References
Additional references consulted:
American Heart Association: Other heart rhythm disorders
American Heart Association: Tachycardia: Fast heart rate
National Heart, Lung, and Blood Institute: How the heart works
National Heart, Lung, and Blood Institute: Arrhythmia
Ferri FF. Wolff-Parkinson-White syndrome. In: Ferri's Clinical Advisor 2025. Elsevier; 2025.
Escudero CA, et al. Loss of ventricular preexcitation during noninvasive testing does not exclude high-risk accessory pathways: A multicenter study of WPW in children. Heart Rhythm. 2020.
Source references:
Wolff-Parkinson-White syndrome - Symptoms and causes (June 19, 2026)
Wolff-Parkinson-White syndrome - Diagnosis and treatment (June 19, 2026)
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