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The delta wave and QRS complex are predominantly negative in leads V1 and V2 and positive in the other precordial leads, resembling left bundle branch block.

In this type of WPW syndrome, the delta wave and QRS complex are predominantly straight in the precordial leads. The dominant R wave in lead V1 may be misinterpreted as right bundle branch block.

WPW syndrome is categorized into two types depending on the ECG findings. They are the type A and the type B. Let us have a brief discussion on each one of them.

The ECG on the top shows normal sinus rhythm and the ECG at the bottom shows Wolff-Parkinson-White Syndrome.

The WPW Syndrome comes under the category of heart’s electrical abnormality called the pre-excitation syndrome. It is usually recognized by the changes seen in the electrocardiogram. An electrocardiogram (ECG) is a graphical record that shows the heart’s electrical activity.

WPW Syndrome stands for Wolff-Parkinson-White Syndrome. It is also called as Ventricular pre-excitation with arrhythmia. WPW syndrome is the most common type of ventricular pre-excitation syndromes. In normal conditions, the electrical signals in the heart move through the heart using a single path. It is as a result of the movement of electrical signals from the heart’s atria to the ventricles, the heart beat is caused. Therefore for the heart to beat properly, the timing of the electrical signals play a vital role. But in case of people with Wolff-Parkinson-White syndrome, as they are born with an extra connection in the heart, called an accessory pathway which allows electrical signals to go around the atrioventricular node and move from the atria to the ventricles faster than usual, this results in the arrival of the electrical signals to the ventricle sooner than it actually should. This condition is called the WPW syndrome. 

Wolff-Parkinson-White Syndrome (WPW Syndrome) 30 Jul 2010

WPW syndrome: Causes, Symptoms, Diagnosis, Treatment and Complications | Heart Consult