Accessory pathway

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Accessory atrioventricular bundle; accessory atrioventricular pathway; accessory conducting pathway; bypass tract; concealed accessory pathway

Overview

An accessory pathway is an additional route for impulse conduction between the atrium and the ventricle that generally does not involve the atrioventricular node (AV node). Conduction through accessory pathways usually exhibit electrophysiological properties different from the AV node.

Conditions Involving Accessory Pathways

• Wolff-Parkinson-White syndrome (WPW)
• Lown-Ganong-Levine syndrome (LGL)

Diagnosis

Wolf-Parkinson-White Syndrome

• There is a shortened PR interval to < 0.12 seconds
• A wide QRS with a delta wave.
• The QRS is 0.11 second or longer

References

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