202406252242

Status:

Tags: ECG

left anterior fascicular block

• left axis deviation
• qR aVL & I
• rS II & III
  a/w poor R wave progression
  controversy on whether possible to Dx LAFB + LVH concurrently

Guideline definition

1. Frontal plane axis between 45° and 90°.
2. qR pattern in lead aVL.
3. R-peak time in lead aVL of 45 ms or more.
4. QRS duration less than 120 ms

References

AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society. Endorsed by the International Society for Computerized Electrocardiology. J Am Coll Cardiol. 2009 Mar 17;53(11):976-81.