Third degree AV block

A third degree AV block means that the AV node is completely blocked and no impulses are getting through to the ventricles. There will be P waves ‘marching on’ through the trace without any clear relationship to the QRS complexes. The QRS complexes will be following their own escape rhythm with complete disregard to the P waves.

See also: AV Blocks

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References

ECG Library (43)

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In the ECGquest archives, this ECG has been tagged with: - 12-Lead Wandering baseline Bradycardia Extra P waves Third degree AV block ECG of the Week CC-BY-NC-SA
ECG of the Week – 12th November 2018 – Interpretation

This ECG is from a woman in her 70s who presented following a fall at home.

In the ECGquest archives, this ECG has been tagged with: - Dizziness 12-Lead Absent P waves Bradycardia Normal Axis Regular Atrial fibrillation Junctional escape Third degree AV block ECG of the Week CC-BY-NC-SA
ECG of the Week – 17th September 2018 – Interpretation

This ECG is from a woman in her 70s who complained of dizziness on a background of ischaemic heart disease, atrial fibrillation and diabetes.

In the ECGquest archives, this ECG has been tagged with: - Chronic kidney disease Dyspnoea Weakness 12-Lead Ventricular escape Third degree AV block Hyperkalemia Dr Smith's ECG Blog CC BY-NC
A 60-something dialysis patient with complete heart block: ultrasound before and after treatment
In the ECGquest archives, this ECG has been tagged with: - Chest pain Hypotension 12-Lead Bradycardia Concordant ST depression in V1-V3 Excessive discordant ST elevation Wide QRS LBBB Third degree AV block Acute Inferior MI ECG Guru CC-BY-NC-SA
Inferior Wall M.I. With Wide QRS and Complete AV Block

This ECG is from a woman in her 60s who presented with chest pain, nausea, vomiting and diarrhoea for 4 hours.

This ECG shows complete heart block with most likely junctional escape and LBBB. Excessive discordant ST elevation in inferior leads and concordant ST depression in V2. The cause was an acute inferior MI.