Wolff-Parkinson-White Syndrome

Diagnosis

Mayo Clinic doctors trained in heart conditions (cardiologists) and heart rhythm conditions (electrophysiologists) diagnose people who have Wolff-Parkinson-White (WPW) syndrome.

To diagnose WPW syndrome, your doctor will review your symptoms and medical and family history. Your doctor will conduct a physical examination and conduct several tests to diagnose your condition and any related heart rhythm conditions.

• Blood tests. Blood tests may be used to check thyroid hormone and potassium levels in your blood, which may lead to some heart rhythm disorders.
• Chest X-ray. A chest X-ray takes images of your chest, heart and lungs, which may help your doctor to see if your heart is enlarged.
• Echocardiogram (Doppler echocardiogram). In this test, sound waves create detailed images of your heart's size, structure and motion. Your doctor may order a transesophageal echocardiogram. In this test, a doctor inserts a flexible tube with a probe (transducer) into your esophagus to take detailed images of your heart.
• Electrocardiogram (ECG). In an ECG, doctors place sensor patches (electrodes) on your skin to measure the electrical impulses given off by your heart. An ECG measures the timing and rhythm of each electrical phase in your heartbeat.
• Electrophysiology study. In this test, your doctor inserts thin, flexible tubes (catheters) with electrodes at the tips into a blood vessel in your arm or groin. The doctor then threads them through your blood vessels to several places within your heart. Once in place, the electrodes can precisely map the spread of electrical impulses throughout your heart.
• Event recorder. An event recorder is a portable ECG device that you can activate when you experience symptoms.
• Holter monitor. A Holter monitor is a portable ECG device that you wear for a day or more to record your heart's electrical activity during your daily routine.
• Stress test. In a stress test, your heart is monitored by an ECG or other tests as you exercise on a treadmill or stationary bicycle. If you have difficulty exercising, your doctor may give you a drug to help stimulate your heart in a similar way as during exercise.

Read more about echocardiogram, electrocardiogram, Holter monitor and stress test at MayoClinic.com.