Right bundle branch block (RBBB)
In RBBB, the right bundle branch no longer conducts electricity. Therefore, as the electrical impulse leaves the His bundle, it enters left bundle branch only, and is carried to the left ventricle. Then, from the left ventricle, the electrical impulse finally makes its way to the right ventricle. As a result, the two ventricles no longer receive the electrical impulse simultaneously. First the left ventricle receives the electrical impulse, then the right.
In LBBB, the opposite occurs. Here, the left bundle branch no longer conducts electricity. The electrical impulse thus enters right bundle branch, and is carried to the right ventricle (first panel).
From there, it finally spreads to the left ventricle (second panel). Once again, the two ventricles no longer receive the electrical impulse simultaneously. First the right ventricle receives the electrical impulse, then the left.
With either type of BBB, therefore, the electrical signal spreads across the ventricles sequentially, as opposed to simultaneously. This sequential spread of the impulse (i.e., first the right ventricle, then the left – or vice versa) means that it takes longer for the impulse to reach throughout the ventricles. The significance of bundle branch block
BBB is quite common, and occurs in a variety of medical conditions. RBBB occurs in medical conditions that affect the right side of the heart or the lungs, so a finding of RBBB on the ECG ought to trigger a screening exam for such conditions.
These include blood clots to the lung (pulmonary embolus), chronic lung disease, cardiomyopathy, and atrial and ventricular septal defects. However, RBBB also commonly occurs in normal, healthy individuals, and the screening exam therefore often turns up no medical problems. In these cases, the RBBB has no apparent medical significance, and can be written off as a “normal variant,” and safely ignored.
In contrast, LBBB usually indicates underlying cardiac pathology. It is seen in dilated cardiomyopathy, hypertrophic cardiomyopathy, hypertension, aortic valve disease, coronary artery disease, and a variety of other cardiac conditions. While occasionally LBBB occurs in apparently healthy people, its appearance should trigger a thorough search (as opposed to a simple screening) for underlying cardiac problems.
Hope this helps a little
matador 89
2006-12-16 05:23:16
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answer #1
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answered by Anonymous
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A package deal department block is truthfully a relatively natural discovering on an EKG. To fully grasp what it's, you have got to fully grasp how the center beats. A beat begins within the sinus node of the higher correct atrium, travels via each atria and to the AV node. From there it's transmitted to the ventricles- the scale back 2 chambers of the center, through the HIS package deal. There it branches right into a correct and left package deal department- each and every package deal for the corresponding ventricle, correct to the correct, left to the left. The electric impulse will have to journey via all sides and intent each to agreement at approximately the equal distinctive time- supply or take a couple of nanoseconds. In your buddy's case, there's a mild prolong within the conduction at the correct facet. The package deal is incomplete, because of this it is not carrying out the electric impulse fairly as good as anticipated. It's nonetheless carrying out a few electrical power although- that's why they are saying it is incomplete. If the package deal is thoroughly blocked, the correct facet of the center will beat accordingly of the electrical power at the left spreading over to the correct facet, so you would get a type of lub-dub-dub form of sound. As it's, the correct facet of the center sends blood to the lungs for oxygenation and if there have been a drawback, it could intent crisis with the lungs certainly. However, your buddy turns out to have an attractive traditional EKG or else, so the surgeon will certainly recall this to be effectively a traditional variation and there are not any certain issues. It could be some distance worse if it had been a whole left package deal department block, or if each branches had been blocked- a infrequent factor. In that case, your buddy could want an vast cardiac workup. But truthfully, it does appear as though your buddy is effectively a traditional variant of the center and would possibly not want some thing else performed. It's simply in general a question of the correct ventricle is a hair past due in contracting, and that's most likely nonetheless flawlessly traditional. But I'm now not a heart specialist, and the last phrase will nonetheless have got to come from the surgeon of direction. In the interim although, I can no less than let you know that it is not existence threatening, and I've noticeable this 1000s of occasions in flawlessly healthful persons.
2016-09-03 12:50:44
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answer #2
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answered by ? 4
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Right bundle branch block is not an uncommon finding in a person with a completely normal heart. My initial research, my first text book, and my first teaching assignment all involved the electrocardiogram. If you send me additional health information and if you scan me a copy of your electrocardiogram I will give you a more detailed response. My university email is johnerussomd@jhu.edu
2006-12-16 09:09:06
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answer #3
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answered by john e russo md facm faafp 7
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