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.
First degree AV block EKG examples
Introduction
For the main page on First Degree AV Block, click here.
EKG Examples
EKG Examples
Shown below is an electrocardiogram with a sinus rhythm. The PR interval is prolonged (> 200ms) and the QRS is a left ward axis (< -30 degrees). The EKG shows a first degree heart block and a left anterior fascicular block.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram of first degree AV block with increased PR interval.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram of first degree AV block with increased PR interval.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram demonstrating a regular rhythm at a rate of 65/min. The PR interval is 400 ms, the QRS is approximately 110 ms, and there are Qs waves in I, II, aVL, and poor R waves in the precordial leads. This is sinus rhythm with a marked first degree heart block. The QRS suggests an extensive anterior/lateral myocardial infarction.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram with sinus rhythm and a marked first degree heart block. In this case the PR interval is about 400 ms. A Holter monitor showed second degree but not third degree A/V block.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram with a first degree AV block
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram depicting sinus rhythm with a first degree A/V block (> 200ms). There is terminal P wave negativity inV1 suggestive of left atrial abnormality. There is left anterior fascicular block (axis < -30 degrees). The ST segment is slightly elevated in leads II and aVF with T wave inversion suggesting inferior ischemiaor infarction.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram depicting a first degree heart block with a left anterior hemi-block.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Shown below is an electrocardiogram depicting sinus rhythm with a prolonged PR interval (>120ms.) which is first degree A/V block. There is also a left axis deviation (axis between -30 and -90 degrees) with R waves in the inferior leads. This axis deviation is consitent with a left anterior fasicular block.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]