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| __NOTOC__
| | #Redirect [[Myocardial bridge#Coronary Angiography]] |
| {{CMG}}; {{AE}} {{Rim}}
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| {{SI}}
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| ==Overview==
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| A myocardial bridge or MB is defined as a segment of a major [[coronary artery|coronary]] [[epicardial]] [[artery]] that "tunnels" or passes intramurally through the [[myocardium]] beneath the muscle bridge during [[systole]].<ref name="pmid15764618">{{cite journal |author=Alegria JR, Herrmann J, Holmes DR, Lerman A, Rihal CS |title=Myocardial bridging |journal=[[European Heart Journal]] |volume=26 |issue=12 |pages=1159–68 |year=2005 |month=June |pmid=15764618 |doi=10.1093/eurheartj/ehi203 |url=http://eurheartj.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=15764618 |accessdate=2012-07-01}}</ref><ref name="pmid12427660">{{cite journal |author=Möhlenkamp S, Hort W, Ge J, Erbel R |title=Update on myocardial bridging |journal=[[Circulation]] |volume=106 |issue=20 |pages=2616–22 |year=2002 |month=November |pmid=12427660 |doi= |url=http://circ.ahajournals.org/cgi/pmidlookup?view=long&pmid=12427660 |accessdate=2012-07-01}}</ref> Myocardial bridges are generally located in the distribution of the [[left anterior descending artery]] ([[LAD]]) and its [[diagonal branch]]es. [[Systolic]] narrowing of the [[epicardial]] [[artery]] shows complete reversal during [[diasole]].<ref name="pmid15764618">{{cite journal |author=Alegria JR, Herrmann J, Holmes DR, Lerman A, Rihal CS |title=Myocardial bridging |journal=[[European Heart Journal]] |volume=26 |issue=12 |pages=1159–68 |year=2005 |month=June |pmid=15764618 |doi=10.1093/eurheartj/ehi203 |url=http://eurheartj.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=15764618 |accessdate=2012-07-01}}</ref> The [[angiographic]] manifestation depends on: the thickness and length of [[myocardial]] bridge, the reciprocal orientation of the [[coronary artery]] and [[myocardial]] fibers, the presence of loose [[connective tissue]] or [[adipose tissue]] around the bridged segment, the presence of an [[left ventricular outflow tract obstruction|aortic outflow tract obstruction]], the intrinsic tone of the wall of the [[coronary artery]], the presence of a [[proximal]] [[coronary artery|coronary]] fixed obstruction and the state of [[myocardial]] [[contractility]].<ref name="pmid15764618">{{cite journal |author=Alegria JR, Herrmann J, Holmes DR, Lerman A, Rihal CS |title=Myocardial bridging |journal=[[European Heart Journal]] |volume=26 |issue=12 |pages=1159–68 |year=2005 |month=June |pmid=15764618 |doi=10.1093/eurheartj/ehi203 |url=http://eurheartj.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=15764618 |accessdate=2012-07-01}}</ref>
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| ==Example==
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| Shown below is an animated image depicting myocardial bridge.
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| [[Image:Myocardial-Bridging.gif|300px| Myocardial bridging]]
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| ----
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| Shown below are two static images of the same case depicting myocardial bridge. Outlined with yellow in the image on the left is the part of the coronary artery during diastole. This same part of the coronary artery is outlined in yellow in the image on the right during systole; note that this outlined part is narrowed compared to its shape during diastole.
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| [[Image:Myocardial bridging static 1.gif|300px| Shape of the coronary artery during diastole]]
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| [[Image:Myocardial-Bridging-Static-2.gif|300px| The coronary artery is narrowed during systole which is consistent myocardial bridging.]]
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| ==References==
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| {{Reflist|2}}
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| {{Coronary Angiography}}
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| [[Category:Cardiology]]
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| [[Category:Angiopedia]]
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