A Novel Valsalva Assist Device for Terminating Supraventricular Tachycardia

The goal of this clinical trial is to evaluate the efficiency of a device for terminating supraventricular tachycardia. The main questions it aims to answer are: The Valsalva manoeuvre is a first-line treatment for supraventricular tachycardia, but the success rate is low. Can the device help to increase the sucess rate? Whether the device is effective and safe to use at home? Researchers will compare whether the device is more effective than a standard Valsalva manoeuvre to treat supraventricular tachycardia. Participants will: be randomly assigned (1:1) to a standard Valsalva manoeuvre group (control) or Valsalva manoeuvre with the device (intervention) .