Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Second degree AV block EKG examples
Introduction
For the main page on Second Degree AV Block, click here.
EKG Examples
EKG Examples
Type I Second Degree AV Block
Shown below is an electrocardiogram showing type I second degree AV block (Wenckebach).
Copyleft image obtained courtesy of ECGpedia,http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram showing type I second degree AV block (Wenckebach).
Copyleft image obtained courtesy of ECGpedia,http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram showing type I second degree AV block (Wenckebach).
Copyleft image obtained courtesy of ECGpedia,http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram showing a Mobitz I A/V block with a gradual increase in the PR interval before the dropped p wave
Copyleft image obtained courtesy of ECGpedia,http://en.ecgpedia.org/wiki/Main_Page
Type II Second-Degree AV Block (Mobitz Type II Block)
Shown below is an electrocardiogram of a 3 channel recording with a 2:1 AV block in a 73 year old woman with dizziness. 2 to 1 AV block (every other P wave is conducted to the ventricles) 2 to 1 AV block starts after the 5th QRS in this 3 channel recording. The first non-conducted P wave is indicated with an arrow. Note the long PR interval of conducted P waves is constant and the left bundle branch block 2 to 1 AV block cannot be classified into Mobitz type I or II as we do not know if the 2nd P wave would be conducted with the same or longer PR interval.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram of a 2:1 AV Block with atrial tachycardia.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an example of EKG showing two strips from the same patient with a 2:1 block on the top tracing and a Mobitz II A/V block on the lower one. Note that with 2:1 block you cannot tell if this is a Mobitz I or II. Mobitz II is seen below as the PR does not change before and after the non-conducted P wave.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Syed Musadiq Ali M.B.B.S.[2]