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Left posterior fascicular block
From WikEM
Criteria
Diagnostic criteria include[1]:
- Right axis deviation (>110)
- QRS < 120ms
- qR in III and AVF
- rS in I and aVL
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
- Usually associated with disease
- Isolated LPFB associated with MI[3]
- Exclude other causes of RAD (PE, COPD, RVH, Lat MI)
See Also
References
- ↑ Surawicz B, et al. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances. Journal of the American College of Cardiology. 2009; 53(11): 976–981.
- ↑ Mattu A and Brady WJ. ECG's for the Emergency Physician. BMJ Books. Sep 19, 2003.
- ↑ Godat FJ and Gertsch M. Isolated left posterior fascicular block: a reliable marker for inferior myocardial infarction and associated severe coronary artery disease. Clin Cardiol. 1993; 16(3):220-226.
Authors
Neil Young, Kevin Lu, Ross Donaldson, Tom Fadial, Daniel Ostermayer
