Narrow VEBs & Trifascicular Block
Report:
Sinus rhythm 85/min
Second degree AV block, unspecified
VEBs in bigeminy
Right axis deviation +120o
Left posterior hemiblock
Right bundle branch block
Comment:
It’s best to observe the bigeminal VEBs in the rhythm strip: no two are the same. Not only that – they look more normal than the conducted sinus beats, the latter widened by the RBBB + LPHB. Are they fusion beats?
The nature of the previous 2:1 AV block is now difficult to define, beyond the general designation of second degree AV block. The VEBs themselves can induce advanced AV block67, but that variety is beyond standard classifications. Even then, is this block advanced (less than 50% conduction)? That depends on whether there is fusion or not. If there is, there is overall 3:2 conduction!
Below (Fig 404a) is a similar trace, but with uniform, also narrow, VEBs.
If you have any suggestions for or feedback on this report, please let us know.
Hi, can we chat about some terms and conditions?
The library and it's records are licensed under the Creative Commons Attribution 4.0 International license.
You are free to:
- Share — copy and redistribute the material in any medium or format for any purpose, even commercially.
- Adapt — remix, transform, and build upon the material for any purpose, even commercially.
- The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- Attribution — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
By clicking agree below, you are agreeing to adhere to CC BY 4.0.