Pre-excitation syndrome

Pre-excitation syndrome
ICD-10	I45.6
ICD-9	426.7, 426.81
DiseasesDB	32903
MeSH	D011226

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Pre-excitation syndrome is a condition where the the ventricles of the heart become depolarized too early, which leads to their partially premature contraction. Normally, the atria (chambers taking venous blood) and the ventriculi (chambers propulsing blood towards organs) are electrically isolated, and only electrical passage exists at "atrioventricular node". In all pre-excitation syndromes, there is at least one more conductive pathway is present. Physiologically, the electrical depolarization wave 'waits' in atrioventricular node to allow atria contract before ventriculi. However, there is no such property exists in abnormal pathway, so electrical stimulus passes to ventricule by this tracts far before normal atrioventricular-his system, and ventricules are depolarized (excitated) before (pre-) normal conduction system. The term pre-excitation derives from this condition.

It is usually caused by a secondary conduction pathway (other than the bundle of His):

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	yes

See also

• Electrical conduction system of the heart

Cost Effectiveness of Pre-excitation syndrome

| group5 = Clinical Trials Involving Pre-excitation syndrome | list5 = Ongoing Trials on Pre-excitation syndrome at Clinical Trials.gov • Trial results on Pre-excitation syndrome • Clinical Trials on Pre-excitation syndrome at Google

| group6 = Guidelines / Policies / Government Resources (FDA/CDC) Regarding Pre-excitation syndrome | list6 = US National Guidelines Clearinghouse on Pre-excitation syndrome • NICE Guidance on Pre-excitation syndrome • NHS PRODIGY Guidance • FDA on Pre-excitation syndrome • CDC on Pre-excitation syndrome

| group7 = Textbook Information on Pre-excitation syndrome | list7 = Books and Textbook Information on Pre-excitation syndrome

| group8 = Pharmacology Resources on Pre-excitation syndrome | list8 = AND (Dose)}} Dosing of Pre-excitation syndrome • AND (drug interactions)}} Drug interactions with Pre-excitation syndrome • AND (side effects)}} Side effects of Pre-excitation syndrome • AND (Allergy)}} Allergic reactions to Pre-excitation syndrome • AND (overdose)}} Overdose information on Pre-excitation syndrome • AND (carcinogenicity)}} Carcinogenicity information on Pre-excitation syndrome • AND (pregnancy)}} Pre-excitation syndrome in pregnancy • AND (pharmacokinetics)}} Pharmacokinetics of Pre-excitation syndrome •

| group9 = Genetics, Pharmacogenomics, and Proteinomics of Pre-excitation syndrome | list9 = AND (pharmacogenomics)}} Genetics of Pre-excitation syndrome • AND (pharmacogenomics)}} Pharmacogenomics of Pre-excitation syndrome • AND (proteomics)}} Proteomics of Pre-excitation syndrome

| group10 = Newstories on Pre-excitation syndrome | list10 = Pre-excitation syndrome in the news • Be alerted to news on Pre-excitation syndrome • News trends on Pre-excitation syndrome</small>

| group11 = Commentary on Pre-excitation syndrome | list11 = Blogs on Pre-excitation syndrome

| group12 = Patient Resources on Pre-excitation syndrome | list12 = Patient resources on Pre-excitation syndrome • Discussion groups on Pre-excitation syndrome • Patient Handouts on Pre-excitation syndrome • Directions to Hospitals Treating Pre-excitation syndrome • Risk calculators and risk factors for Pre-excitation syndrome

| group13 = Healthcare Provider Resources on Pre-excitation syndrome | list13 = Symptoms of Pre-excitation syndrome • Causes & Risk Factors for Pre-excitation syndrome • Diagnostic studies for Pre-excitation syndrome • Treatment of Pre-excitation syndrome

| group14 = Continuing Medical Education (CME) Programs on Pre-excitation syndrome | list14 = CME Programs on Pre-excitation syndrome

| group15 = International Resources on Pre-excitation syndrome | list15 = Pre-excitation syndrome en Espanol • Pre-excitation syndrome en Francais

| group16 = Business Resources on Pre-excitation syndrome | list16 = Pre-excitation syndrome in the Marketplace • Patents on Pre-excitation syndrome

| group17 = Informatics Resources on Pre-excitation syndrome | list17 = List of terms related to Pre-excitation syndrome

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