The most useful test is an ECG (electrocardiogram), a heart rhythm recording, during your palpitations.  This can be done in some GP surgeries, A&E departments and by paramedics.  This recording is sometimes difficult to obtain if the palpitations only last a few minutes. The ECG gives the specialist a good idea of what further tests or treatment may be necessary. We recommend that patients keep copies of their ECGs  and take these copies along to the consultation with a heart rhythm specialist. Other tests such as echocardiography (ultrasound imaging of the heart), long term ECG monitoring and exercise testing (ECG recording whilst walking on a treadmill) may be advised by your doctor.