User:Mr. Ibrahem/Bundle branch block
| Bundle branch block | |
|---|---|
 | |
| Conduction system of the heart 1. SA node. 2. AV node. 3. Bundle of His. 4. Left bundle branch 10. Right bundle branch | |
| Specialty | Cardiology |
| Symptoms | None[1] |
| Types | LBBB, RBBB[2][3] |
| Causes | LBBB: Coronary artery disease[1] RBBB: Normal variation, heart attack, pulmonary embolism[1] |
| Diagnostic method | Electrocardiogram (ECG)[1] |
| Differential diagnosis | Ventricular tachycardia, a run of premature ventricular contractions (PVCs), Brugada syndrome, left anterior fascicular block, left posterior fascicular block, and trifascicular block.[4][2][3] |
| Treatment | No specific measures[4] |
A bundle branch block is a defect in one of the bundle branches of the electrical conduction system of the heart.[1] It may result in a partial or complete inability for an electrical signal to travel through that branch.[4] It generally does not result in symptoms.[1]
There are two main types right bundle branch block (RBBB) and left bundle branch block (LBBB).[2][3] A RBBB may be a normal variation, occur as a result of a prior heart attack, or from a pulmonary embolism.[1][4] And LBBB may indicate coronary artery disease.[1]
Diagnosis is by electrocardiogram (ECG) with a QRS complex of greater than 120 ms.[2][3] Other rhythms that may appear similarly include ventricular tachycardia, a run of premature ventricular contractions (PVCs), Brugada syndrome, left anterior fascicular block, left posterior fascicular block, and trifascicular block.[4][2][3] No specific treatment is required.[4]
References[edit]
- ^ a b c d e f g h "Bundle Branch Block - Heart and Blood Vessel Disorders". Merck Manuals Consumer Version. Retrieved 23 February 2021.
- ^ a b c d e Harkness, WT; Hicks, M (January 2020). "Right Bundle Branch Block". PMID 29939649.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b c d e Scherbak, D; Hicks, GJ (January 2020). "Left Bundle Branch Block". PMID 29489192.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b c d e f "Bundle Branch Block and Fascicular Block - Cardiovascular Disorders". Merck Manuals Professional Edition. Retrieved 23 February 2021.