Left anterior fascicular block: Difference between revisions

(Added hemiblocks graphic)
(additional criteria and significance added)
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[[File:hemiblocks.png|thumb|His-Purkinje system and hemiblocks]]
[[File:hemiblocks.png|thumb|His-Purkinje system and hemiblocks]]
#Left axis deviation (-45 or more) w/QRS <0.10s
==Criteria==
#Deep S in II, III, and AVF
Diagnostic criteria include<ref>Surawicz B, Knilans T. Chou’s Electrocardiography in Clinical Practice (6th edition), Saunders 2008.</ref>:
#Left axis deviation (-45 or more)
#QRS 80-110ms
#rS in II, III, and AVF
#qR in I and aVL
#Increased QRS voltage in the limb leads
 
==Significance==
*Considered benign finding
*LAFB may increase risk of AF, CHF, and death<ref>Mandyam MC, et al. Long-term outcomes of left anterior fascicular block in the absence of overt cardiovascular disease. JAMA. 2013; 309(15):1587-1588.</ref>


==See Also==
==See Also==
*[[ECG (Main)]]
*[[ECG (Main)]]


== Source ==
==References==
*Adapted from Niemann, Lampe, Pani, Donaldson, ECGpedia.org
<references/>
*Journal of Electrocardiology. Vol 43 (2010). 40-42.


[[Category:Cards]]
[[Category:Cards]]

Revision as of 13:29, 8 June 2015

His-Purkinje system and hemiblocks

Criteria

Diagnostic criteria include[1]:

  1. Left axis deviation (-45 or more)
  2. QRS 80-110ms
  3. rS in II, III, and AVF
  4. qR in I and aVL
  5. Increased QRS voltage in the limb leads

Significance

  • Considered benign finding
  • LAFB may increase risk of AF, CHF, and death[2]

See Also

References

  1. ↑ Surawicz B, Knilans T. Chou’s Electrocardiography in Clinical Practice (6th edition), Saunders 2008.
  2. ↑ Mandyam MC, et al. Long-term outcomes of left anterior fascicular block in the absence of overt cardiovascular disease. JAMA. 2013; 309(15):1587-1588.
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