ECG Quest > Blocks > AV Blocks > Second degree AV block

Second degree AV block

A second degree AV block means that the AV node is only working intermittently to transmit the impulse through to the ventricles. This causes extra P waves to be present without a QRS complex after them. There are two main types: Mobitz type I (aka Wenckebach) and type II.

See also: AV Blocks

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References

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In the ECGquest archives, this ECG has been tagged with: - Hypotension Bradycardia Irregular Nonspecific baseline artefact Extra P waves Peaked T waves Wide QRS Second degree AV block Hyperkalemia 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
What will you do for this altered and bradycardic patient?

This ECG is from a woman in her 60s who presented from a nursing home with altered mental status, hypotension, hypoxia and bradycardia.

This ECG shows an irregular rhythm due to second degree AV block with wide QRS and peaked T waves. The cause was hyperkalemia.

Hypotension Bradycardia Irregular Nonspecific baseline artefact Extra P waves Peaked T waves Wide QRS Second degree AV block Hyperkalemia 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
In the ECGquest archives, this ECG has been tagged with: - Grouped Capture beat Sinus arrhythmia First degree AV block Second degree AV block 12-Lead ECG Interpretation Dr Ken Grauer CC-BY-NC-SA
ECG Blog #144 (Bradycardia – AV Block – Alternating BBB – High Grade).
Grouped Capture beat Sinus arrhythmia First degree AV block Second degree AV block 12-Lead ECG Interpretation Dr Ken Grauer CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Hypertension Bradycardia Grouped Junctional escape Second degree AV block Rhythm Strip ECG Guru Dawn Bean Altman Dr Ken Grauer Jason Roediger CC-BY-NC-SA
ECG Rhythms: AV Block | ECG Guru – Instructor Resources
Hypertension Bradycardia Grouped Junctional escape Second degree AV block Rhythm Strip ECG Guru Dawn Bean Altman Dr Ken Grauer Jason Roediger CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Dizziness Right Axis Deviation Narrow QRS Normal PR Tall QRS Accelerated junctional rhythm Change in rhythm Normal Sinus Rhythm High grade AV block Second degree AV block Third degree AV block Sick sinus syndrome 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 2nd October 2017 – Interpretation
Dizziness Right Axis Deviation Narrow QRS Normal PR Tall QRS Accelerated junctional rhythm Change in rhythm Normal Sinus Rhythm High grade AV block Second degree AV block Third degree AV block Sick sinus syndrome 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Bradycardia Extra P waves Wide QRS Second degree AV block Rhythm Strip LITFL Dr Edward Burns CC-BY-NC-SA
High-grade AV block 4:1
Bradycardia Extra P waves Wide QRS Second degree AV block Rhythm Strip LITFL Dr Edward Burns CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Extra P waves Second degree AV block Rhythm Strip LITFL Dr Edward Burns CC-BY-NC-SA
AV Block 2nd degree, fixed ratio 3:1
Extra P waves Second degree AV block Rhythm Strip LITFL Dr Edward Burns CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Extra P waves Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
AV Block 2nd degree, fixed ratio 2:1
Extra P waves Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Long lie Right Axis Deviation Extra P waves Wide QRS RBBB Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
2:1 AV block
Long lie Right Axis Deviation Extra P waves Wide QRS RBBB Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Chest pain Irregular Normal Axis Changing PR interval Extra P waves Long PR Second degree AV block Second degree AV block type 1 - Wenckebach 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
2nd degree AV block
Chest pain Irregular Normal Axis Changing PR interval Extra P waves Long PR Second degree AV block Second degree AV block type 1 - Wenckebach 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Chest pain Biphasic T waves Wellens Waves Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
Wellens
Chest pain Biphasic T waves Wellens Waves Second degree AV block 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
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This is a library of 2358 free, open access, re-usable ECGs from across the web.

Where did they come from?

These ECGs were collected from Free Open Access Medical Education (#FOAMed) blogs, with the permission of their authors. You can find out more about each ECG's source by clicking on it.

Why are they here?

This is an experiment in digital curation. The idea is to collect resources to increase awareness and accessibility. Over time, more ECGs in the collection will be tagged to make it easier to find them and reused in new interactive quizzes.

How can I use these ECGs?

You can use these ECGs for your own learning, teaching or research - as long as you abide by the terms of each ECG's copyright licence as stipulated by the original author.