Heart Rhythm Specialists

Supraventricular
Tachycardia (SVT)

Advanced diagnosis and treatment for fast heart rhythms originating in the upper chambers of the heart.

Request an Appointment Call: 252-317-3030

Understanding Supraventricular Tachycardia (SVT)

Supraventricular Tachycardia (SVT) is a type of abnormal heart rhythm that originates in the upper chambers of the heart. It causes the heart to suddenly beat faster than normal, often without warning. These episodes may begin and end abruptly and can last from seconds to several hours. While SVT is not always life-threatening, frequent or prolonged episodes can interfere with daily life and may require specialized care. With accurate diagnosis and advanced treatment options, SVT can be effectively managed — and often cured.

What Happens During SVT?

The heart's rhythm is controlled by electrical signals that travel in a coordinated pattern. In SVT, these signals become disrupted due to an abnormal electrical pathway, causing the heart to beat rapidly. Instead of following the normal rhythm, the electrical impulses may loop or misfire, leading to episodes of rapid heart rate that can feel sudden and overwhelming.

Symptoms of SVT

Patients with SVT may experience a range of symptoms depending on how fast the heart is beating and how long the episode lasts. Some individuals may have minimal symptoms, while others may find episodes disruptive and concerning. Common symptoms include:

Sudden rapid or pounding heartbeat

Palpitations or fluttering in the chest

Shortness of breath

Dizziness or lightheadedness

Fatigue or weakness

Chest discomfort or fainting

What Causes SVT?

SVT is most often caused by abnormal electrical circuits within the heart. These circuits may be present from birth or develop over time. In many cases, SVT occurs in otherwise healthy individuals with no structural heart disease. Common contributing factors include:

Extra electrical pathways in the heart

Stress or anxiety

Caffeine or stimulant use

Alcohol consumption

Certain medications

Underlying heart conditions

Types of SVT

There are several forms of SVT, each involving a different mechanism of abnormal electrical activity. Identifying the specific type is essential for determining the most effective treatment approach:

AVNRT — Atrioventricular Nodal Reentrant Tachycardia is the most common type of SVT, caused by a reentrant circuit within the AV node itself.

AVRT — Atrioventricular Reentrant Tachycardia involves an extra electrical pathway connecting the upper and lower chambers of the heart.

Atrial Tachycardia — This type originates from a small, localized area within the atria and fires rapidly on its own.

How SVT is Diagnosed

A comprehensive evaluation is important to confirm the diagnosis and understand the underlying cause of SVT. Our specialists use the following diagnostic tools:

An Electrocardiogram (ECG) to capture the heart's rhythm and identify characteristic patterns of SVT during or between episodes.

A Holter monitor or event monitor worn for 24 hours to 30 days to detect intermittent SVT episodes during daily activities.

An Electrophysiology (EP) study to precisely map the abnormal electrical pathways inside the heart and confirm the SVT type.

Treatment Options

Vagal Maneuvers

Simple techniques such as bearing down or cold stimulus to activate the vagus nerve and slow the heart rate during an episode

Medication Therapy

Beta-blockers, calcium channel blockers, or antiarrhythmic drugs to control heart rate and prevent recurrent SVT episodes

Cardioversion

A controlled electrical shock used in rare or severe cases to safely reset the heart to a normal rhythm

Catheter Ablation

A minimally invasive procedure with a high success rate that eliminates the abnormal pathway — often providing a permanent cure

Frequently Asked Questions

Is SVT dangerous or life-threatening?

SVT is rarely life-threatening in otherwise healthy individuals. However, frequent or prolonged episodes can significantly affect quality of life and may lead to complications if left untreated. Evaluation by a cardiac electrophysiologist ensures proper assessment of your individual risk.

What should I do during an SVT episode?

Try vagal maneuvers such as bearing down (Valsalva maneuver) or applying a cold stimulus to the face. If the episode does not resolve quickly, is accompanied by chest pain, fainting, or severe shortness of breath, seek emergency care immediately.

Can catheter ablation permanently cure SVT?

Yes, for many patients. Catheter ablation targets and eliminates the abnormal electrical pathway responsible for SVT. It has a high long-term success rate and can often provide a complete cure, removing the need for ongoing medication.

Do I need to take medication for the rest of my life?

Not necessarily. Medications can help manage symptoms but do not cure SVT. Patients who prefer a definitive solution, or those whose symptoms are not well controlled with medication, are often excellent candidates for catheter ablation.

Take the Next Step Toward a Normal Heart Rhythm

Living with SVT can be unpredictable, but effective treatment options are available. Our heart rhythm specialists are here to help you regain control.

Request an Appointment Call Us: 252-317-3030

Why Specialized Care Matters

SVT is a complex electrical condition that requires precise diagnosis and expert management. Evaluation by a cardiac electrophysiologist ensures accurate identification of the arrhythmia type, access to advanced diagnostic tools, and personalized treatment planning — including expertise in catheter ablation procedures. Every patient's condition is unique, and treatment decisions are based on the type and severity of SVT, frequency of episodes, overall heart health, and individual lifestyle and preferences. A tailored approach ensures the most effective and appropriate care, and with the right treatment, most patients experience significant relief — and many achieve a complete cure.

SupraventricularTachycardia (SVT)