Diagnosis

Tests and procedures used to diagnose AVNRT may include:

• Blood tests to check thyroid function, heart disease or other conditions that may trigger your abnormal heartbeat
• Electrocardiogram (ECG) to measure the electrical activity of your heart and measure the timing and duration of each heartbeat
• Holter monitor, which is a portable ECG device designed to record your heart's activity as you perform your normal everyday activities
• Echocardiogram, which uses sound waves to produce images of your heart's size, structure and motion

Your doctor might also try to trigger an episode with other tests, which may include:

• Stress test, which is typically done on a treadmill or stationary bicycle while your heart activity is monitored\
• Electrophysiological study and cardiac mapping, which allow your doctor to see the precise location of the irregular heartbeat (arrhythmia)