Atrial tachycardia (AT) is an abnormal heart rhythm, but unlike atrial fibrillation (AF) it is more regular and organised.

AT also comes from the top chambers (atria) of the heart, from either the right side, left side or both. We normally see this in patients who have:

• undergone heart surgery
• congenital heart defects
• undergone previous ablation procedures.

Some people may experience symptoms such as a fast heartbeat, which may feel regular in nature but can also feel irregular. Other symptoms experienced may be like AF, such as breathlessness, dizziness and tiredness.