Mahaim fibers: Difference between revisions
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{{SK}} Atypical bypass tracts | {{SK}} Atypical bypass tracts, fasciculoventricular fibers, Mahaim physiology, nodoventricular fibers, paraspecific fibers of Mahaim | ||
==Overview== | ==Overview== | ||
Mahaim fibers refer to the connecting fibers originating from the [[atrioventricular node|atrioventricular node (AV node)]], [[bundle of His]], or left bundle branch that join the [[ventricle|ventricular]] [[myocardium]]. The myocardial fibers resemble the tissue of origin and gradually take over the characteristics of the ventricular myocardial cells.<ref name="isbn1-4377-0285-6">{{cite book | author = A. John Camm MD FRCP FESC FACC FAHA FHRS; Sanjeev Saksena MBBS MD FACC FESC FHRS FAHA | authorlink = | editor = | others = | title = Electrophysiological Disorders of the Heart: Expert Consult - Online and Print, 2e | edition = | language = | publisher = Saunders | location = Philadelphia | year = 2011 | origyear = | pages = | quote = | isbn = 1-4377-0285-6 | oclc = | doi = | url = | accessdate = }}</ref> Mahaim fibers may be present from the AV node to the right, left, or middle part of the [[interventricular septum]]. They may serve as the substrate for a variety of [[pre-excitation syndrome]]s. | Mahaim fibers refer to the connecting fibers originating from the [[atrioventricular node|atrioventricular node (AV node)]], [[bundle of His]], or left bundle branch that join the [[ventricle|ventricular]] [[myocardium]]. The myocardial fibers resemble the tissue of origin and gradually take over the characteristics of the ventricular myocardial cells.<ref name="isbn1-4377-0285-6">{{cite book | author = A. John Camm MD FRCP FESC FACC FAHA FHRS; Sanjeev Saksena MBBS MD FACC FESC FHRS FAHA | authorlink = | editor = | others = | title = Electrophysiological Disorders of the Heart: Expert Consult - Online and Print, 2e | edition = | language = | publisher = Saunders | location = Philadelphia | year = 2011 | origyear = | pages = | quote = | isbn = 1-4377-0285-6 | oclc = | doi = | url = | accessdate = }}</ref> Mahaim fibers may be present from the AV node to the right, left, or middle part of the [[interventricular septum]]. They may serve as the substrate for a variety of [[pre-excitation syndrome]]s. | ||
==Historical Perspective== | ==Historical Perspective== | ||
Mahaim and Benatt described the islands of conducting tissue extending from the [[bundle of His]] to the [[ventricle|ventricular]] [[myocardium]] in 1937.<ref name="MahaimBenatt1937">{{cite journal|last1=Mahaim|first1=Ivan|last2=Benatt|first2=Alfred|title=Nouvelles recherches sur les connexions supérieures de la branche gauche du faisceau de His-Tawara avec la cloison interventriculaire|journal=Cardiology|volume=1|issue=2|year=1937|pages=61–73|issn=1421-9751|doi=10.1159/000164567}}</ref> These fasciculoventricular fibers as well as the nodofascicular fibers are referred to as Mahaim fibers. However, Gillette and colleagues provided evidences suggesting anatomic substrates of the preexciation variants previously attributed to Mahaim fibers may be actually atriofascicular or atrioventricular pathways that possess anterograde decremental conduction properties.<ref name="pmid7055047">{{cite journal | author = Gillette PC, Garson A, Cooley DA, McNamara DG | title = Prolonged and decremental antegrade conduction properties in right anterior accessory connections: Wide QRS antidromic tachycardia of left bundle branch block pattern without Wolff-Parkinson-White configuration in sinus rhythm | journal = [[American Heart Journal]] | volume = 103 | issue = 1 | pages = 66–74 | year = 1982 | month = January | pmid = 7055047 | doi = | url = | issn = }}</ref> | Mahaim and Benatt described the islands of conducting tissue extending from the [[bundle of His]] to the [[ventricle|ventricular]] [[myocardium]] in 1937.<ref name="MahaimBenatt1937">{{cite journal|last1=Mahaim|first1=Ivan|last2=Benatt|first2=Alfred|title=Nouvelles recherches sur les connexions supérieures de la branche gauche du faisceau de His-Tawara avec la cloison interventriculaire|journal=Cardiology|volume=1|issue=2|year=1937|pages=61–73|issn=1421-9751|doi=10.1159/000164567}}</ref> These fasciculoventricular fibers as well as the nodofascicular fibers are referred to as Mahaim fibers. However, Gillette and his colleagues provided evidences suggesting anatomic substrates of the preexciation variants previously attributed to Mahaim fibers may be actually atriofascicular or atrioventricular pathways that possess anterograde decremental conduction properties.<ref name="pmid7055047">{{cite journal | author = Gillette PC, Garson A, Cooley DA, McNamara DG | title = Prolonged and decremental antegrade conduction properties in right anterior accessory connections: Wide QRS antidromic tachycardia of left bundle branch block pattern without Wolff-Parkinson-White configuration in sinus rhythm | journal = [[American Heart Journal]] | volume = 103 | issue = 1 | pages = 66–74 | year = 1982 | month = January | pmid = 7055047 | doi = | url = | issn = }}</ref> | ||
==Conditions Involving Mahaim Fibers== | ==Conditions Involving Mahaim Fibers== | ||
*Mahaim tachycardia | *Mahaim tachycardia | ||
==Treatment== | |||
When medical therapy fails while treating [[LGL]] syndrome, which is rare, radiofrequency ablation of AV node or bundle of His with its accessory fibers may be considered. | |||
==References== | ==References== | ||
Revision as of 17:01, 26 August 2013
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and keywords: Atypical bypass tracts, fasciculoventricular fibers, Mahaim physiology, nodoventricular fibers, paraspecific fibers of Mahaim
Overview
Mahaim fibers refer to the connecting fibers originating from the atrioventricular node (AV node), bundle of His, or left bundle branch that join the ventricular myocardium. The myocardial fibers resemble the tissue of origin and gradually take over the characteristics of the ventricular myocardial cells.[1] Mahaim fibers may be present from the AV node to the right, left, or middle part of the interventricular septum. They may serve as the substrate for a variety of pre-excitation syndromes.
Historical Perspective
Mahaim and Benatt described the islands of conducting tissue extending from the bundle of His to the ventricular myocardium in 1937.[2] These fasciculoventricular fibers as well as the nodofascicular fibers are referred to as Mahaim fibers. However, Gillette and his colleagues provided evidences suggesting anatomic substrates of the preexciation variants previously attributed to Mahaim fibers may be actually atriofascicular or atrioventricular pathways that possess anterograde decremental conduction properties.[3]
Conditions Involving Mahaim Fibers
- Mahaim tachycardia
Treatment
When medical therapy fails while treating LGL syndrome, which is rare, radiofrequency ablation of AV node or bundle of His with its accessory fibers may be considered.
References
- ↑ A. John Camm MD FRCP FESC FACC FAHA FHRS; Sanjeev Saksena MBBS MD FACC FESC FHRS FAHA (2011). Electrophysiological Disorders of the Heart: Expert Consult - Online and Print, 2e. Philadelphia: Saunders. ISBN 1-4377-0285-6.
- ↑ Mahaim, Ivan; Benatt, Alfred (1937). "Nouvelles recherches sur les connexions supérieures de la branche gauche du faisceau de His-Tawara avec la cloison interventriculaire". Cardiology. 1 (2): 61–73. doi:10.1159/000164567. ISSN 1421-9751.
- ↑ Gillette PC, Garson A, Cooley DA, McNamara DG (1982). "Prolonged and decremental antegrade conduction properties in right anterior accessory connections: Wide QRS antidromic tachycardia of left bundle branch block pattern without Wolff-Parkinson-White configuration in sinus rhythm". American Heart Journal. 103 (1): 66–74. PMID 7055047. Unknown parameter
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