Pre-Excitation Syndromes

**Definition:** A group of conditions in which HEART VENTRICLE activation by the atrial impulse is faster than the normal impulse conduction from the SINOATRIAL NODE. In these pre-excitation syndromes, atrial impulses often bypass the ATRIOVENTRICULAR NODE delay and travel via ACCESSORY CONDUCTING PATHWAYS connecting the atrium directly to the BUNDLE OF HIS.

**Tree numbers:** - C14.280.067.780 - C14.280.123.750

**Synonyms:** - Preexcitation Syndrome