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).

Featured Example

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? 29169

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). 8794
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 8902
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 7477
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 4:1 475
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 3:1 473
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 2:1 471
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 392
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 346
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 123
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 1375
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 962
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 2408 free, open access, re-usable ECGs from across the web.

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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.

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