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 four main types: Mobitz type I (aka Wenckebach), Mobitz type II, 2:1, and a high grade block (3:1 or greater).

See also: AV Blocks

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LITFL

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ECG Library (18)

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In the ECGquest archives, this ECG has been tagged with: - Hypotension 12-Lead Nonspecific baseline artefact Bradycardia Extra P waves Irregular Peaked T waves Wide QRS Second degree AV block Hyperkalemia Dr Smith's ECG Blog 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 12-Lead Nonspecific baseline artefact Bradycardia Extra P waves Irregular Peaked T waves Wide QRS Second degree AV block Hyperkalemia Dr Smith's ECG Blog CC BY-NC
In the ECGquest archives, this ECG has been tagged with: - 12-Lead Capture beat Grouped Sinus arrhythmia First degree AV block Second degree AV block ECG Interpretation CC-BY-NC-SA
ECG Blog #144 (Bradycardia – AV Block – Alternating BBB – High Grade).
12-Lead Capture beat Grouped Sinus arrhythmia First degree AV block Second degree AV block ECG Interpretation CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Hypertension Rhythm Strip Bradycardia Grouped Junctional escape Second degree AV block ECG Guru CC-BY-NC-SA
ECG Rhythms: AV Block | ECG Guru – Instructor Resources
Hypertension Rhythm Strip Bradycardia Grouped Junctional escape Second degree AV block ECG Guru CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Dizziness 12-Lead Narrow QRS Normal PR Right Axis Deviation 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 ECG of the Week CC-BY-NC-SA
ECG of the Week – 2nd October 2017 – Interpretation
Dizziness 12-Lead Narrow QRS Normal PR Right Axis Deviation 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 ECG of the Week CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Rhythm Strip Bradycardia Extra P waves Wide QRS Second degree AV block LITFL CC-BY-NC-SA
High-grade AV block 4:1
Rhythm Strip Bradycardia Extra P waves Wide QRS Second degree AV block LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Rhythm Strip Extra P waves Second degree AV block LITFL CC-BY-NC-SA
AV Block 2nd degree, fixed ratio 3:1
Rhythm Strip Extra P waves Second degree AV block LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - 12-Lead Extra P waves Second degree AV block LITFL CC-BY-NC-SA
AV Block 2nd degree, fixed ratio 2:1
12-Lead Extra P waves Second degree AV block LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Long lie 12-Lead Extra P waves Right Axis Deviation Wide QRS RBBB Second degree AV block LITFL CC-BY-NC-SA
2:1 AV block
Long lie 12-Lead Extra P waves Right Axis Deviation Wide QRS RBBB Second degree AV block LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Chest pain 12-Lead Changing PR interval Extra P waves Irregular Long PR Normal Axis Second degree AV block Second degree AV block type 1 - Wenckebach LITFL CC-BY-NC-SA
2nd degree AV block
Chest pain 12-Lead Changing PR interval Extra P waves Irregular Long PR Normal Axis Second degree AV block Second degree AV block type 1 - Wenckebach LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Chest pain 12-Lead Biphasic T waves Wellens Waves Second degree AV block LITFL CC-BY-NC-SA
Wellens
Chest pain 12-Lead Biphasic T waves Wellens Waves Second degree AV block LITFL CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Nonspecific baseline artefact Rhythm Strip High grade AV block Second degree AV block ECG Guru CC-BY-NC-SA
Second-degree AV Block, Type II
Nonspecific baseline artefact Rhythm Strip High grade AV block Second degree AV block ECG Guru CC-BY-NC-SA
In the ECGquest archives, this ECG has been tagged with: - Rhythm Strip Second degree AV block Second degree AV block type 1 - Wenckebach ECG Guru CC-BY-NC-SA
ECG Basics: Second-degree AV Block With Characteristics of Type I and Type II
Rhythm Strip Second degree AV block Second degree AV block type 1 - Wenckebach ECG Guru CC-BY-NC-SA
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This is a library of 2395 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.