Junctional bradycardia electrocardiogram: Difference between revisions
Created page with "__NOTOC__ {{Junctional bradycardia}} {{CMG}}; {{AE}} {{M.P}} ==Overview== Junctional bradycardia or AV junction rhythm is usually caused by the absence of the electrical imp..." |
No edit summary |
||
| (2 intermediate revisions by the same user not shown) | |||
| Line 5: | Line 5: | ||
==Overview== | ==Overview== | ||
Junctional bradycardia or AV junction rhythm is usually caused by the absence of the electrical impulse from the [[SA | Junctional bradycardia or AV junction rhythm is usually caused by the absence of the electrical impulse from the [[SA node]]. This usually appears on an EKG with a normal [[QRS]] complex accompanied with an inverted P wave either before, during, or after the QRS complex. | ||
==Electrocardiography== | |||
A 12 lead EKG should be obtained to evaluate the rhythm. In so far as it may alter treatment, any co-existing rhythm disturbance that may have precipitated junctional bradycardia should be ascertained such as: | A 12 lead EKG should be obtained to evaluate the rhythm. In so far as it may alter treatment, any co-existing rhythm disturbance that may have precipitated junctional bradycardia should be ascertained such as: | ||
| Line 25: | Line 25: | ||
* The [[P wave]] may be buried within the [[QRS]] complex and may not be discernable. | * The [[P wave]] may be buried within the [[QRS]] complex and may not be discernable. | ||
* A slow [[AV nodal reentry tachycardia]] ([[AVNRT]]) should be excluded. | * A slow [[AV nodal reentry tachycardia]] ([[AVNRT]]) should be excluded. | ||
===Holter / Cardiac Event Monitoring=== | |||
A cardiac event monitor may be helpful in patients with transient symptoms or [[palpitations]] to exclude other rhythms such as [[ventricular tachycardia]]. | |||
===Electrophysiologic Studies=== | |||
* There is normal conduction in the [[His bundle]], and the His-ventricular interval is normal. | |||
* Preceding each [[QRS]], there should be a [[His bundle]] depolarization | |||
* AV conduction is variable | |||
* VA conduction is variable | |||
==References== | ==References== | ||
Latest revision as of 22:14, 11 September 2013
|
Junctional bradycardia Microchapters |
|
Diagnosis |
|---|
|
Treatment |
|
Case Studies |
|
Junctional bradycardia electrocardiogram On the Web |
|
to Hospitals Treating Junctional bradycardia electrocardiogram |
|
Risk calculators and risk factors for Junctional bradycardia electrocardiogram |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mugilan Poongkunran M.B.B.S [2]
Overview
Junctional bradycardia or AV junction rhythm is usually caused by the absence of the electrical impulse from the SA node. This usually appears on an EKG with a normal QRS complex accompanied with an inverted P wave either before, during, or after the QRS complex.
Electrocardiography
A 12 lead EKG should be obtained to evaluate the rhythm. In so far as it may alter treatment, any co-existing rhythm disturbance that may have precipitated junctional bradycardia should be ascertained such as:
- AV dissociation
- Complete heart block
- Digitalis toxicity
- Sinus arrest
- Sinus bradycardia
- ST elevation MI
The characteristic EKG findings in junctional bradycardia patients are:
- The rate is 40-60 beats per minute.
- The rate is generally regular.
- The QRS complex is narrow.
- Retrograde P waves may be present due to retrograde conduction from the AV node. The P waves will be inverted in leads II and III.
- The P wave may be buried within the QRS complex and may not be discernable.
- A slow AV nodal reentry tachycardia (AVNRT) should be excluded.
Holter / Cardiac Event Monitoring
A cardiac event monitor may be helpful in patients with transient symptoms or palpitations to exclude other rhythms such as ventricular tachycardia.
Electrophysiologic Studies
- There is normal conduction in the His bundle, and the His-ventricular interval is normal.
- Preceding each QRS, there should be a His bundle depolarization
- AV conduction is variable
- VA conduction is variable