AV blocks: Difference between revisions
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*First Degree | ==Types== | ||
[[File:FirstAVBlock.jpg|thumb|First degree AV block]] | |||
[[File:Second degree heart block.png|thumb|Types of second degree AV block]] | |||
[[File:Rhythm strip showing third degree heart block.jpg|thumb|Third degree AV block.]] | |||
*[[First Degree AV Block]] | |||
**Prolonged PR interval (>200msec) but constant and always conducts | **Prolonged PR interval (>200msec) but constant and always conducts | ||
*Second Degree | *Second Degree | ||
**Type I | **[[Second Degree AV Block Type I]] (Wenckeback) | ||
***Progressive prolongation with intermittent dropped QRS complexes | ***Progressive prolongation with intermittent dropped QRS complexes | ||
***Progressively shortening RR intervals | ***Progressively shortening RR intervals | ||
**Type II | **[[Second Degree AV Block Type II]] | ||
***PR interval is constant with intermittent P waves not conducting QRS complexes | ***PR interval is constant with intermittent P waves not conducting QRS complexes | ||
***Surrounding RR intervals are constant | ***Surrounding RR intervals are constant | ||
*Third Degree | *[[Third Degree AV Block]] | ||
**Complete Heart Block - no AV conduction | **Complete Heart Block - no AV conduction | ||
**Dissociation between P waves and QRS complexes | **Dissociation between P waves and QRS complexes | ||
==Evaluation== | |||
*March out P waves | |||
*March out QRS complex | |||
*Look at PR interval to determine relation | |||
==See Also== | ==See Also== | ||
*[[ECG rhythms]] | *[[ECG rhythms]] | ||
{{AV block types}} | |||
{{ | |||
==References== | ==References== | ||
<references/> | |||
[[Category:Cardiology]] | [[Category:Cardiology]] | ||
Latest revision as of 22:44, 27 March 2024
Types
- First Degree AV Block
- Prolonged PR interval (>200msec) but constant and always conducts
- Second Degree
- Second Degree AV Block Type I (Wenckeback)
- Progressive prolongation with intermittent dropped QRS complexes
- Progressively shortening RR intervals
- Second Degree AV Block Type II
- PR interval is constant with intermittent P waves not conducting QRS complexes
- Surrounding RR intervals are constant
- Second Degree AV Block Type I (Wenckeback)
- Third Degree AV Block
- Complete Heart Block - no AV conduction
- Dissociation between P waves and QRS complexes
Evaluation
- March out P waves
- March out QRS complex
- Look at PR interval to determine relation
See Also
AV blocks
- First degree AV block
- Second degree
- Third degree AV block
- AV dissociation without complete heart block