Left anterior fascicular block: Difference between revisions
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[[File:hemiblocks.png|thumb|His-Purkinje system and hemiblocks]] | |||
# | ==Criteria== | ||
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 | |||
===LAFB vs LPFB<ref>Mattu A and Brady WJ. ECG's for the Emergency Physician. BMJ Books. Sep 19, 2003.</ref>=== | |||
{| {{table}} | |||
| align="center" style="background:#f0f0f0;"|''''' | |||
| align="center" style="background:#f0f0f0;"|'''LAFB''' | |||
| align="center" style="background:#f0f0f0;"|'''LPFB''' | |||
|- | |||
| Axis||Left axis deviation||Right axis deviation | |||
|- | |||
| I and aVL||Upright QRS||Downgoing QRS | |||
|- | |||
| III||Downgoing QRS||Upright QRS | |||
|- | |||
|} | |||
==Significance== | |||
*Considered benign finding | |||
*LAFB may increase risk of [[afib]], [[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)]] | ||
*[[Left posterior fascicular block]] | |||
==External Links== | |||
*[http://ddxof.com/ecg-guide/ DDxOf: ECG Guide] | |||
*[https://canadiem.org/fascicular-blocks/ CanadiEM - The Boring Guide to ECG's: Fascicular blocks] | |||
== | ==References== | ||
<references/> | |||
[[Category: | [[Category:Cardiology]] | ||
Latest revision as of 01:29, 2 July 2021
Criteria
Diagnostic criteria include[1]:
- 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
LAFB vs LPFB[2]
| LAFB | LPFB | |
| Axis | Left axis deviation | Right axis deviation |
| I and aVL | Upright QRS | Downgoing QRS |
| III | Downgoing QRS | Upright QRS |
Significance
See Also
External Links
References
- ↑ Surawicz B, Knilans T. Chou’s Electrocardiography in Clinical Practice (6th edition), Saunders 2008.
- ↑ Mattu A and Brady WJ. ECG's for the Emergency Physician. BMJ Books. Sep 19, 2003.
- ↑ 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.