Left bundle branch block pathophysiology: Difference between revisions
Jump to navigation
Jump to search
(Created page with "__NOTOC__ {{Left bundle branch block}} Please help WikiDoc by adding content here. It's easy! Click here to learn about editing. ==References...") |
No edit summary |
||
| Line 1: | Line 1: | ||
__NOTOC__ | __NOTOC__ | ||
{{Left bundle branch block}} | {{Left bundle branch block}} | ||
{{CMG}}; {{RT}}; {{AN}} | |||
Please help WikiDoc by adding content here. It's easy! Click [[Help:How_to_Edit_a_Page|here]] to learn about editing. | Please help WikiDoc by adding content here. It's easy! Click [[Help:How_to_Edit_a_Page|here]] to learn about editing. | ||
==Pathophysiology== | |||
===Normal Conduction=== | |||
# The normal cardiac conduction proceeds in a way so as to allow time for atrium to relax during atrial [[diastole]]. | |||
# The electrical impulse generated in the [[SA node]] travels through the internodal pathways towards the [[AV node]]. | |||
# The conduction through the AV node is slowed down as it travels through it. This decrease in velocity of conduction allows time for atrial to contract ahead of the ventricle so that the blood from the atria can fill up the ventricles through the atrio-ventricular valves. | |||
# As the impulse flows through the compact AV node, it rapidly conducts through the ventricular myocardial cells. Once the depolarization is complete, the ventricle relaxes during the [[diastole]] in preparation for the next impulse. | |||
[[Image:Conduction system of the heart.png|left|thumb|200px|Conduction system of the heart]]<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /> | |||
===Anatomy=== | |||
* The conduction system of the heart consists of specialized cells designed to conduct electrical impulse faster than the surrounding myocardial cells. | |||
* Anatomically, the AV node is divided into three regions as follows: | |||
** Transitional cell zone: This is the region where the internodal atrial pathways merge with the compact AV node. | |||
** Compact AV node: This region is located at the apex of the [[triangle of Koch]], which is formed by the ostium of [[coronary sinus]], tricuspid annulus and the [[tendon of Todaro]]. | |||
** Penetrating portion of the AV bundle: This region enters the [[tendon of Torado]] and runs within the fibrous body of the [[interventricular septum|membranous interventricular septum]] and eventually divides at the crest of the [[interventricular septum|muscular interventricular septum]] into right and left branches. | |||
==References== | ==References== | ||
Revision as of 19:05, 28 April 2013
|
Left bundle branch block Microchapters |
|
Differentiating Left Bundle Branch Block from other Diseases |
|---|
|
Diagnosis |
|
Treatment |
|
Case Studies |
|
Left bundle branch block pathophysiology On the Web |
|
American Roentgen Ray Society Images of Left bundle branch block pathophysiology |
|
Risk calculators and risk factors for Left bundle branch block pathophysiology |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Raviteja Guddeti, M.B.B.S. [2]; Aarti Narayan, M.B.B.S [3]
Please help WikiDoc by adding content here. It's easy! Click here to learn about editing.
Pathophysiology
Normal Conduction
- The normal cardiac conduction proceeds in a way so as to allow time for atrium to relax during atrial diastole.
- The electrical impulse generated in the SA node travels through the internodal pathways towards the AV node.
- The conduction through the AV node is slowed down as it travels through it. This decrease in velocity of conduction allows time for atrial to contract ahead of the ventricle so that the blood from the atria can fill up the ventricles through the atrio-ventricular valves.
- As the impulse flows through the compact AV node, it rapidly conducts through the ventricular myocardial cells. Once the depolarization is complete, the ventricle relaxes during the diastole in preparation for the next impulse.
Anatomy
- The conduction system of the heart consists of specialized cells designed to conduct electrical impulse faster than the surrounding myocardial cells.
- Anatomically, the AV node is divided into three regions as follows:
- Transitional cell zone: This is the region where the internodal atrial pathways merge with the compact AV node.
- Compact AV node: This region is located at the apex of the triangle of Koch, which is formed by the ostium of coronary sinus, tricuspid annulus and the tendon of Todaro.
- Penetrating portion of the AV bundle: This region enters the tendon of Torado and runs within the fibrous body of the membranous interventricular septum and eventually divides at the crest of the muscular interventricular septum into right and left branches.