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

Can you add to the information on this page?

This ECG Archive is an academic, non-commercial #FOAMed project aiming to crowdsource a free open access database of ECGs and signs. If you include your personal details such as your name you will be attributed for your contribution, unless you tell us that you don't want this to happen. Personal contact details such as email addresses will not be published but may be used to email you in reply. Full project details and participant information available here.

Featured Example

References

ECG Library (38)

Sort by:
TitleDate
ASCDESC
Show:
31230
Columns:
In the ECGquest archives, this ECG has been tagged with: - Cardiac arrest Dyspnoea 12-Lead Anterior ST elevation Lateral ST elevation Sinus tachycardia LAFB RBBB Left main occlusion Dr Smith's ECG Blog CC BY-NC
How does acute left main occlusion present on the ECG? Case 2

This ECG is from a young woman who presented with sudden pulmonary oedema. This ECG was recorded just before she arrested.

This ECG shows sinus tachycardia, RBBB, LAFB and ST elevation in V2-6, I and aVL. The cause was a 100% left main occlusion.

In the ECGquest archives, this ECG has been tagged with: - Chest pain 12-Lead Anterior ST elevation Bifascicular block LAFB RBBB Multi-vessel disease Dr Smith's ECG Blog CC BY-NC
What is the Diagnosis in this 70-something with Chest Pain?

This ECG is from a man in his 70s who presented with chest pain.

This ECG shows RBBB, LAFB and ST elevation V2-4. The troponin was very high due to a very large infarct. The cause was 3 vessel disease. The rhythm is also grouped, possibly bigeminy.

In the ECGquest archives, this ECG has been tagged with: - 12-Lead Tachycardia Wide QRS Change in rhythm Wide complex tachycardia Bifascicular block LAFB RBBB Positive Sgarbossa criteria 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 12-Lead Left Axis Deviation Long PR Normal rate RSR' Wide QRS First degree AV block LAFB RBBB Trifascicular block 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: - 12-Lead Left Axis Deviation Bifascicular block LAFB RBBB 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 12-Lead Anterior ST elevation Inferior ST depression ST elevation in aVL LAFB Mid-anterior MI Dr Smith's ECG Blog 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 12-Lead Electrode misplacement Lateral ST elevation Left Axis Deviation LAFB RBBB Acute Anterior MI Acute Lateral MI Dr Smith's ECG Blog 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 12-Lead Absent P waves Concordant ST depression in V1-V3 Hyperacute T waves Irregular Left Axis Deviation Wide QRS Atrial fibrillation LAFB RBBB 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.