Supraventricular Tachycardia (SVT)

Supraventricular Tachycardia (SVT) – Expert Diagnosis & Private Treatment in London

What Is Supraventricular Tachycardia (SVT)?

Supraventricular tachycardia (SVT) is a type of abnormal heart rhythm (arrhythmia) where the heart suddenly beats much faster than normal. It begins in the upper chambers of the heart (the atria) and can cause a rapid pulse, palpitations, light-headedness, or even chest discomfort.

Although often not life-threatening, SVT can be distressing, particularly if episodes are frequent or long-lasting. At London Heart Group, our expert private cardiologists in Harley Street offer same-day diagnostics and tailored treatment for SVT, helping you regain confidence and control over your heart rhythm.

Symptoms of SVT

SVT episodes can start suddenly and may last from a few seconds to several hours. Symptoms often include:

  • Rapid heartbeat or fluttering in the chest (palpitations)

  • Light-headedness or dizziness

  • Shortness of breath

  • Fatigue or weakness

  • Chest pain or tightness

  • Fainting (syncope) in rare cases

Some people experience only mild symptoms, while others may find SVT episodes interfere with daily life. If you are experiencing these symptoms, especially if they occur repeatedly, we recommend seeking a full cardiac assessment.

What Causes SVT?

SVT occurs when abnormal electrical pathways in the heart create a short circuit, causing the heart to beat too quickly. Triggers and contributing factors can include:

  • Congenital electrical pathway abnormalities

  • Stress or anxiety

  • Caffeine or energy drinks

  • Alcohol or recreational drugs

  • Overactive thyroid (hyperthyroidism)

  • Certain medications

Many cases occur in otherwise healthy individuals, and sometimes there is no obvious cause. At London Heart Group, we carry out a comprehensive assessment to determine the type and cause of your SVT and recommend the most effective treatment.

How Is SVT Diagnosed?

Diagnosing SVT requires capturing the abnormal rhythm during or shortly after an episode. At London Heart Group, we offer advanced cardiac diagnostics, including:

  • 12-lead ECG – to record heart rhythm at rest

  • 24- or 72-hour Holter monitoring – continuous ECG monitoring over 1–3 days

  • Event recorder – used over weeks if symptoms are infrequent

  • Echocardiogram – ultrasound to assess heart structure

  • Electrophysiology study (EPS) – for detailed mapping of electrical activity if needed

Our Harley Street clinic provides same-day access to most of these tests, ensuring fast and accurate diagnosis.

How Is SVT Treated?

Treatment depends on the type, frequency, and severity of your SVT episodes. Our experienced cardiologists will tailor a treatment plan that may include:

Lifestyle Changes & Monitoring

For infrequent or mild episodes, avoiding triggers (like caffeine or stress) may be enough. We also teach techniques like the Valsalva manoeuvre to help slow the heart during an attack.

Medications

Anti-arrhythmic or rate control medications can help prevent or manage SVT episodes. These are typically used when symptoms are more persistent.

Catheter Ablation (Curative Treatment)

For frequent or troublesome SVT, we may recommend radiofrequency ablation – a minimally invasive procedure that uses heat energy to eliminate the abnormal electrical pathway causing the arrhythmia. This can permanently cure SVT in most cases.

Our electrophysiology team at London Heart Group are specialists in advanced SVT ablation procedures and will guide you through every step.

Why Choose London Heart Group?

  • Expert private cardiologists with sub-specialty training in arrhythmia care

  • Same-day ECG, heart rhythm monitoring, and consultation

  • Harley Street clinic with access to the latest ablation technology

  • Personalised care with second opinion services available

  • Trusted by GPs and consultants across London and the UK

Book a Private SVT Assessment in London

If you're experiencing episodes of a rapid heartbeat, palpitations, or other symptoms of SVT, don’t ignore them. Early diagnosis and treatment can significantly improve your quality of life and prevent complications.

Call us now or book your private consultation online with London Heart Group – leading cardiology care in Harley Street, London.