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Worried about supraventricular tachycardia?

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This page summarises publicly available NHS information for educational purposes only. It is not medical advice or a diagnosis. Always consult a qualified healthcare professional.

What is supraventricular tachycardia?

Supraventricular tachycardia (SVT) causes sudden episodes of abnormally fast heartbeat, often over 100 beats per minute. Episodes start and stop abruptly and can last seconds to hours. Common triggers include caffeine, alcohol, and stress. SVT is usually not dangerous but can feel alarming. Treatment ranges from self-help techniques to medication or ablation.

When NHS resources suggest seeing a GP

  • You keep getting episodes of fast heartbeat.
  • Episodes are lasting longer or happening more frequently.
  • You feel dizzy, lightheaded, or faint during episodes.
  • You have chest pain or difficulty breathing during a fast heartbeat.
  • Call 999 if you have severe chest pain, faint, or have difficulty breathing during an episode.
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Self-care information from NHS

  • Cut down on caffeine and alcohol — common triggers for SVT episodes.
  • Stop or reduce smoking.
  • Get enough sleep and manage stress.
  • Try vagal manoeuvres to stop an episode: bear down, blow into a closed syringe, or splash cold water on your face.
  • Keep a diary of episodes — when they happen, how long they last, and what triggered them.
  • Carry a record of your heart rate during episodes (use a pulse oximeter or smartwatch) to show your GP.

Common questions

How do I stop an SVT episode?

Vagal manoeuvres can sometimes stop an episode — try bearing down as if straining, blowing into a closed syringe, or splashing cold water on your face. If episodes are frequent or prolonged, a cardiologist may recommend medication or catheter ablation.

Is SVT dangerous?

SVT is usually not life-threatening, but prolonged or very frequent episodes should be assessed. Call 999 if an episode comes with severe chest pain, fainting, or difficulty breathing.

What triggers SVT?

Common triggers include caffeine, alcohol, stress, lack of sleep, and strenuous exercise. Some people find episodes happen without any obvious trigger. Keeping a diary can help identify your personal triggers.

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This page is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional about your individual situation. NorMed organises publicly available NHS information and is not affiliated with the NHS.