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

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 Personal contact details such as email addresses will not be published but may be used to email you in reply.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 (18)

Sort by:
TitleDate
ASCDESC
Show:
31230
Columns:
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.

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).
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
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