ECG Quest > Blocks > BBB/Hemiblocks > LAFB

LAFB

A left anterior fascicular block will have left axis deviation, Q waves in leads I and aVL and a small R in lead III, in the absence of left ventricular hypertrophy. This is a diagnosis of exclusion, after you have ruled out other causes of left axis deviation such as inferior infarction.

See also: BBB/Hemiblocks

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References

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In the ECGquest archives, this ECG has been tagged with: - Tachycardia Wide QRS Change in rhythm Wide complex tachycardia Bifascicular block LAFB RBBB Positive Sgarbossa criteria 12-Lead Dr Smith's ECG Blog CC BY-NC
What is this rhythm? And what else does it show?

This ECG is from a man in his 60s who presented with abdominal pain dyspnoea and altered level of consciousness, in shock.

This ECG shows wide complex tachycardia with concordant ST elevation in V4-6, due to LAD occlusion. The rhythm was likely sinus tachycardia with RBBB and then LAFB mid way through the trace.

In the ECGquest archives, this ECG has been tagged with: - Syncope Left Axis Deviation Normal rate Long PR RSR' Wide QRS First degree AV block LAFB RBBB 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 26th November 2018 – Interpretation

This ECG is from a man in his 60s who presented after an episode of syncope.

This ECG shows bifascicular block (RBBB + LAFB) with a first degree AV block. He underwent pacemaker insertion.

In the ECGquest archives, this ECG has been tagged with: - Left Axis Deviation Bifascicular block LAFB RBBB 12-Lead ECG Guru CC-BY-NC-SA
Instructors’ Collection ECG: Bifascicular Block

This ECG is from a woman in her 70s who presented with sepsis.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Anterior ST elevation Inferior ST depression ST elevation in aVL LAFB Mid-anterior MI 12-Lead Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
Thrombus propagation on 10 serial Prehospital ECGs: Can you explain the progression?

This ECG is from a patient of unknown age who presented with chest pain. This was the repeat ECG 19 minutes later.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea Electrode misplacement Left Axis Deviation Lateral ST elevation LAFB RBBB Acute Anterior MI Acute Lateral MI 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
A man in his 80s with chest pain

This ECG is from a man in his 80s who presented with chest pain and shortness of breath. This was the repeat ECG just before he arrested.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea Irregular Left Axis Deviation Absent P waves Concordant ST depression in V1-V3 Hyperacute T waves Wide QRS Atrial fibrillation LAFB RBBB 12-Lead Dr Smith's ECG Blog CC BY-NC
Chest pain and Concordant ST Depression in a patient with aortic valve and previously normal angiogram – on arrival.