AV blocks: Difference between revisions
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*[[First Degree AV Block]] | ==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]]<ref>Alboni P, Holz A, Brignole M. Vagally mediated atrioventricular block: pathophysiology and diagnosis. Heart. 2013 Jul;99(13):904-8. PMID 23286970</ref> | |||
**Prolonged PR interval (>200msec) but constant and always conducts | **Prolonged PR interval (>200msec) but constant and always conducts | ||
*Second Degree | *Second Degree | ||
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**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 10:44, 22 March 2026
Types
- First Degree AV Block[1]
- 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
References
- ↑ Alboni P, Holz A, Brignole M. Vagally mediated atrioventricular block: pathophysiology and diagnosis. Heart. 2013 Jul;99(13):904-8. PMID 23286970