Pre-excitation syndrome
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
W8MD medical weight loss and sleep centers
Pre-excitation syndrome is an abnormal heart rhythm in which the ventricles of the heart become depolarized too early, which leads to their partial premature contraction.
Pathophysiology[edit | edit source]
Normally, the atria and the ventricles are electrically isolated, and electrical contact between them exists only at the "atrioventricular node". In all pre-excitation syndromes, at least one more conductive pathway is present. Physiologically, the normal electrical depolarization wave is delayed at the atrioventricular node to allow the atria to contract before the ventricles. However, there is no such delay in the abnormal pathway, so the electrical stimulus passes to the ventricle by this tract faster than via normal atrioventricular/bundle of His system, and the ventricles are depolarized (excited) before (pre-) normal conduction system.
Types[edit | edit source]
Several types of pre-excitation syndrome have been described.[1]
Type | Conduction pathway | PR interval | QRS interval | Delta wave? |
Wolff-Parkinson-White syndrome | Bundle of Kent (atria to ventricles) | short | long | yes |
Lown-Ganong-Levine syndrome | "James bundle" (atria to bundle of His) | short | normal | no |
Mahaim-type | Mahaim fibers | normal | long | no |
References[edit | edit source]
- ↑ "General principles of asynchronous activation and preexcitation". Retrieved 2009-08-12.
External links[edit | edit source]
Classification |
---|
Navigation: Wellness - Encyclopedia - Health topics - Disease Index - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro) available.
Advertise on WikiMD
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.Contributors: Prab R. Tumpati, MD