Left anterior fascicular block: Difference between revisions
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*Left axis deviation (-45 or more) | *Left axis deviation (-45 or more) | ||
*QRS 80-110ms | *QRS 80-110ms | ||
*rS in II, III, and | *rS in II, III, and aVF | ||
*qR in I and aVL | *qR in I and aVL | ||
*Increased QRS voltage in the limb leads | *Increased QRS voltage in the limb leads | ||
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==Significance== | ==Significance== | ||
*Considered benign finding | *Considered benign finding | ||
*LAFB may increase risk of | *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== | ||
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==External Links== | ==External Links== | ||
*[http://ddxof.com/ecg-guide/ DDxOf: ECG Guide] | *[http://ddxof.com/ecg-guide/ DDxOf: ECG Guide] | ||
*[https://canadiem.org/fascicular-blocks/ CanadiEM - The Boring Guide to ECG's: Fascicular blocks] | |||
==References== | ==References== | ||
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.