Pre-excitation syndrome

Source: Wikipedia, the free encyclopedia.
Pre-excitation syndrome
Right bundle branch
SpecialtyCardiology

Pre-excitation syndrome is a heart condition in which part of the

abnormal heart rhythms. It is usually diagnosed using an electrocardiogram, but may only be found during an electrophysiological study.[2] The condition may not require any treatment at all, but symptoms can be controlled using medication or catheter ablation
.

Types

Several types of pre-excitation syndrome have been described.[3]

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

Pathophysiology

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.

References

  1. OCLC 48363139.{{cite book}}: CS1 maint: others (link
    )
  2. OCLC 938434294.{{cite book}}: CS1 maint: location missing publisher (link
    )
  3. ^ "General principles of asynchronous activation and preexcitation". Archived from the original on 2012-11-27. Retrieved 2009-08-12.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Pre-excitation_syndrome&oldid=1183541687"