Wenckebach Conduction of Sinus Tachycardia
Report:
Sinus tachycardia 116/min
SVEB
Second degree AV block, Möbitz 1
Comment:
Some of the blocked P waves look different in shape from others, due to their position on the preceding T wave. Their timing easily distinguishes them from blocked SVEBs.
The fifth group in the lower strip shows a Wenckebach sequence with prolonging, then shortened PR intervals; the atrial rate is also irregular. A reentry beat is suggested by the apparent mirror-image P wave associated with shorter PR interval (the fourth in the group), but this is merely due to its superimposition on an earlier part of the T wave. The shorter PR interval and R-R cycle are most likely due to the early QRS being a dissociated (P waves are all on time) junctional beat. It needn’t be that, ether: Wenckebach conduction can shorten spontaneously in the middle of a sequence, but this is quite uncommon.
Even large P waves can be “buried” in sinus tachycardia and their detection (and differentiation from other atrial activity) is only possible by mapping them out.
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.