Introduction
SVT describes several fast rhythms that begin in or near the upper chambers of the heart. Episodes often start and stop abruptly and can feel frightening, even when the rhythm is not dangerous.
Assessment and treatment choices
The most useful information is a recording during an episode. This may be an ECG, a wearable recording or a longer monitor. The rhythm type, frequency of episodes, effect on daily life and any associated dizziness or blackout all influence the advice.
Some people are taught a simple manoeuvre to try during an episode; others may be offered medication. Catheter ablation can treat several common SVT circuits directly and may be an attractive option when episodes are recurrent or medication is not preferred. SVT: medication or catheter ablation? explains how that choice is usually approached.
Key points
- An ECG during symptoms is helpful, although a monitor may be needed to capture episodes.
- Some episodes settle by themselves; others need treatment.
- Catheter ablation can be a curative option for some types of SVT.
Patient note
“The most helpful first step is to establish exactly which rhythm is causing the episodes. The treatment options then become much clearer.”
Questions about SVT treatment
How fast is the heartbeat? How do episodes start and stop? How often do they occur? How much do they affect work, travel, exercise or driving? Would monitoring help capture the rhythm? Would episodic treatment, medication or a potentially definitive procedure best fit my priorities?
FAQ
Is SVT dangerous?
Many forms of SVT are not life-threatening, but an individual assessment is important, especially if symptoms are severe or associated with fainting.