Pre-excitation syndrome

Pre-excitation syndrome

Infobox_Disease
Name = PAGENAME


Caption =
DiseasesDB = 32903
ICD10 = ICD10|I|45|6|i|30
ICD9 = ICD9|426.7, ICD9|426.81
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
MeshID = D011226

Pre-excitation syndrome is a condition where the the ventricles of the heart become depolarized too early, which leads to their partial premature contraction. Normally, the atria (chambers taking venous blood) and the ventricles (chambers pumping blood towards organs) 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, so the ventricles are depolarized (excited) before (pre-) normal conduction system.

ee also

* Electrical conduction system of the heart


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