LBBB: Negative Concordant Precordial Pattern
Report:
Sinus rhythm
PR interval 0.20â
Left atrial abnormality
Normal axis
Left bundle branch block
Comment:
History of infarction and marked cardiomegaly are clues as to why there is a concordant precordial QS pattern. This example has normal axis: it is chosen to obviate a third cause for QS in V5-6 - a frontal plane right or left axis deviation, which predisposes to dramatic changes in these leads with slight vertical electrode displacement. Approximately 50% of patients with LBBB have normal axis.
Lead V7 shows an R wave in this patient with cardiomegaly (Fig 17a).
Fig 17a. Lead V6 has been placed in V7 position.
Fig 18. 21 year old girl with Downâs syndrome. She had surgery for congenital heart disease 8 years previously.
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 its 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.