Third degree AV block pathophysiology: Difference between revisions
Jump to navigation
Jump to search
(Created page with "__NOTOC__ {{Third degree AV block}} {{CMG}}; {{AE}} {{CZ}} ==Pathophysiology== *Because the impulse is blocked, an accessory pacemaker below the level of the block will typic...") |
|||
| Line 4: | Line 4: | ||
==Pathophysiology== | ==Pathophysiology== | ||
* | *In complete heart block because the impulse is blocked, an accessory pacemaker below the level of the block will typically activate the ventricles. This is known as an escape rhythm. Since this accessory pacemaker activates independently of the impulse generated at the [[SA node]], two independent rhythms can be noted on the[[electrocardiogram]] (EKG). | ||
:* One will activate the atria and create the P waves, typically with a regular P to P interval. | :* One will activate the atria and create the P waves, typically with a regular P to P interval. | ||
Revision as of 19:43, 4 February 2013
|
Third degree AV block Microchapters | |
|
Diagnosis | |
|---|---|
|
Treatment | |
|
Case Studies | |
|
Third degree AV block pathophysiology On the Web | |
|
American Roentgen Ray Society Images of Third degree AV block pathophysiology | |
|
Risk calculators and risk factors for Third degree AV block pathophysiology | |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]
Pathophysiology
- In complete heart block because the impulse is blocked, an accessory pacemaker below the level of the block will typically activate the ventricles. This is known as an escape rhythm. Since this accessory pacemaker activates independently of the impulse generated at the SA node, two independent rhythms can be noted on theelectrocardiogram (EKG).
- One will activate the atria and create the P waves, typically with a regular P to P interval.
- The second will activate the ventricles and produce the QRS complex, typically with a regular R to R interval. The PR interval will be variable, as the hallmark of complete heart block is no apparent relationship between P waves and QRS complexes.