Bundle branch block: Difference between revisions
Jump to navigation
Jump to search
Kingrajinix (talk | contribs) |
Kingrajinix (talk | contribs) |
||
| Line 5: | Line 5: | ||
*RBBB: [[atrial septal defect]], [[PE]], [[MI]] | *RBBB: [[atrial septal defect]], [[PE]], [[MI]] | ||
===ECG Changes=== | ===ECG Changes=== | ||
[[image:bbb.jpg|300px|thumb|right|Think '''W'''i'''LL'''ia'''M''' and '''M'''a'''RR'''o'''W'''. See the text if that doesn't make sense.]] | [[image:bbb.jpg|300px|thumb|right|Think '''W'''i'''LL'''ia'''M''' and '''M'''a'''RR'''o'''W'''. Also, notice the '''wide QRS''' complexes. See the text if that doesn't make sense.]] | ||
If you're not sure about bundle branch block, think of '''W'''i'''LL'''ia'''M''' and '''M'''a'''RR'''o'''W''' | If you're not sure about bundle branch block, think of '''W'''i'''LL'''ia'''M''' and '''M'''a'''RR'''o'''W''' | ||
*'''L'''BBB: there is a '''W''' shape in '''V1''' and an '''M''' shape in '''V6'''. | *'''L'''BBB: there is a '''W''' shape in '''V1''' and an '''M''' shape in '''V6'''. The "W" wave is also called an rS wave because it has a very slight rise (r) and a big drop (S) in amplitude (admittedly, it's more a V than a W but Villiam is a less common name). The "M" wave, also called R, is just a large rise (R) with a tiny dip and tiny rise. | ||
*'''R'''BBB: there is an '''M''' shape in '''V1''' and a '''W''' shape in '''V6'''. | *'''R'''BBB: there is an '''M''' shape in '''V1''' and a '''W''' shape in '''V6'''. The "M" wave here has a small rise (r), a big drop (S) and an even bigger rise (R) giving an rSR wave. Finally, the W is your normal qRs complex but just wider. | ||
In both cases, there is a '''wide QRS''' complex. | |||
Revision as of 15:27, 28 December 2009
Definition
Cessation of appropriate electrical conduction down either the left of right bundle branch.
Pathophysiology
- LBBB: aortic stenosis, dilated cardiomyopathy, MI, CAD.
- RBBB: atrial septal defect, PE, MI
ECG Changes
If you're not sure about bundle branch block, think of WiLLiaM and MaRRoW
- LBBB: there is a W shape in V1 and an M shape in V6. The "W" wave is also called an rS wave because it has a very slight rise (r) and a big drop (S) in amplitude (admittedly, it's more a V than a W but Villiam is a less common name). The "M" wave, also called R, is just a large rise (R) with a tiny dip and tiny rise.
- RBBB: there is an M shape in V1 and a W shape in V6. The "M" wave here has a small rise (r), a big drop (S) and an even bigger rise (R) giving an rSR wave. Finally, the W is your normal qRs complex but just wider.
In both cases, there is a wide QRS complex.