View source for Left anterior fascicular block

[[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 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==
*[[ECG (Main)]]
*[[Left posterior fascicular block]]

==External Links==
*[http://ddxof.com/ecg-guide/ DDxOf: ECG Guide]

==References==
<references/>

[[Category:Cardiology]]