Adrenalin / Flecainide Challenge
The purpose of an Adrenalin Challenge is to see if you are likely to have long QT syndrome (LQTS) or Catecholaminergic Polymorphic Ventricular Tachycardia. These are disorders that affect the heart.
This procedure is performed in hospitals only. The doctor will explain the test and take consent prior to commencing the procedure. The doctor or the nurse will insert an intravenous (IV) line into your vein in your hand or arm to administer the Adrenaline.
The Adrenaline Challenge Test is safe, however as with any procedure, there is potential risk that may occur during or after procedure. It is common to experience a sensation of an increased heart rate, that your heart feels like it is beating harder and to feel sweaty during this procedure. These effects resolve quickly once the infusion is complete.
After the test, the IV line will be removed from your arm. Once your vital signs are normal you will then be discharged home. Discharge time will depend on if you have any problems during the procedure and how long it takes you to recover.
A Flecainide challenge is undertaken to see if you have a hidden form of Brugada syndrome. The purpose of the test is to use a drug called Flecainide to uncover the characteristic electrocardiogram (ECG) changes used to diagnose Brugada syndrome.
Flecainide is a drug known as a sodium channel blocker. It is routinely used by doctors to prevent abnormal heart rhythms – these drugs are called anti-arrhythmics. Flecainide is used by doctors in this test as it blocks the faulty sodium channels and unmasks ECG changes in those patients who have Brugada. In patients with normal cardiac cells, Flecainide has little or no effect on the ECG.
After the doctor has performed the test, you will need to stay for approximately one hour. This procedure is performed in hospitals only.