The PR interval progressively lengthens with each beat until the atrial impulse is not conducted and the QRS complex is dropped (Wenckebach phenomenon); AV nodal conduction resumes with the next beat, and the sequence is repeated.

Learn about the causes, symptoms, diagnosis & treatment of Arrhythmias and Conduction Disorders from the Professional Version of the Merck Manuals.

A normal heart rhythm is called normal sinus rhythm (NSR for short). An NSR will have a heart rate (this is the same as the pulse) between 50 and 100 beats per minute and a normal impulse formation from the SA node ( P wave). In the absence of any abnormalities, a completely normal rhythm will also have a normal PR interval (interval from the beginning of the P wave to the beginning of the QRS of .12-.20 seconds), a normal QRS width (time it takes for the ventricles to contract of .04-.10…

A normal heart rhythm is called normal sinus rhythm (NSR for short). An NSR will have a heart rate (this is the same as the pulse) between 50 and 100 beats per minute and a normal impulse formation from the SA node ( P wave). In the absence of any abnormalities, a completely normal rhythm will also have a normal PR interval (interval from the beginning of the P wave to the beginning of the QRS of .12-.20 seconds), a normal QRS width (time it takes for the ventricles to contract of .04-.10…

Heart Block: First-Degree. Delayed AV node conduction. PR interval > 0.2 seconds. No specific rx.

Heart Block: First-Degree. No specific rx.

Sinus arrhythmia often accompanies sinus bradycardia, but the P waves have a normal morphology unless atrial disease is present. (See "Normal sinus rhythm and sinus arrhythmia"). A PR interval of up to 0.21 is normal in sinus bradycardia.

Sinus arrhythmia often accompanies sinus bradycardia, but the P waves have a normal morphology unless atrial disease is present. (See "Normal sinus rhythm and sinus arrhythmia"). A PR interval of up to is normal in sinus bradycardia.

PR IntervalLesson & Quiz

P Wave Training Course and Practice Strips via Practical Clinical Skills.

First Degree Heart Block PR interval will be >200 ms

First Degree Heart Block PR interval will be ms

First Degree AV Block The normal PR interval (PRI) is 0.12 - 0.20 sec, or 120 -to- 200 ms. 1st degree AV block is defined by PR intervals greater than 200 ms. This may be caused by drugs, such as digoxin; excessive vagal tone; ischemia; or intrinsic disease in the AV junction or bundle branch system.

This ECG Interpretation course will show how to identify normal versus abnormal cardiac anatomy, cardiac cycle and electrical conduction through the heart.

How to Measure a PR Interval on EKG Strip | How to Interpret EKGs

This video explains how to measure the PR interval on an EKG strip. In order to do this you must know how the normal measurement of a PR interval and how to .

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