Postural modification to the standard Valsalva Manoeuvre for the emergency treatment of SVT (REVERT): a randomised controlled trial.
The first randomised controlled trial to assess the effect of a postural modification to the standard Valsalva Manoeuvre in the treatment of patients presenting to hospital with SVT has been published. This lay summary is to inform study volunteers, patients and their carers of the outcome of this research and how the results may help them to better manage their condition.
The REVERT study was conducted over a period of 28 months between January 2013 and April 2015. The research team was led by Dr Andrew Appelboam, Consultant in Emergency Medicine at the Royal Devon & Exeter Hospital, Exeter, Devon, UK. Trudie Lobban MBE was a member of the research team, representing patients. Mrs Lobban is the Founder & CEO of Arrhythmia Alliance – The Heart Rhythm Charity.
Supraventricular tachycardia (SVT) is a common cardiac arrhythmia (irregular heart rhythm) affecting people of all ages. When a person suffers an attack, the heart beats very quickly producing unpleasant palpitations. People experiencing such an attack frequently attend the Emergency Department of a hospital, often concerned that they may be suffering a heart attack when in fact it is a heart rhythm problem.
The first treatment offered is usually a Valsalva Manoeuvre (VM). This is a physical treatment using a strain while blowing, like trying to inflate a balloon, which sometimes successfully slows the heart rhythm and the SVT attack stops. If the VM does not work, a drug called adenosine is usually injected into a vein to cease the irregular heart rhythm (arrhythmia); this is usually successful but has very unpleasant side effects.
It has been suggested that changing the way the VM is performed may increase its effectiveness and reduce the need for adenosine. The aim of this study was to determine whether a modified VM is more successful at restoring a normal heart rhythm than a standard VM. In the standard method the VM is performed entirely in the sitting position. In the modified version the VM is still performed in the sitting position, but then the patient is immediately laid down with their legs lifted for 15 seconds before being returned to sitting.
In ten hospitals in the South West of England, adults attending the Emergency Department with suspected SVT were invited to take part in the study. Patients were not allowed to enter the study if they were medically unstable, or in the last trimester of pregnancy, or unable to have their legs lifted for any reason.
In total, 428 individuals with SVT were recruited to the study. Of these, 214 were randomly allocated to undergo a standard VM and 214 to undergo the modified approach.