PR Interval - EKG Basics


The PR Interval indicates AV conduction time, from the start of atrial depolarization to the start of ventricular depolarization (the QRS cømplex).

In this step you should measure the interval from where the P wave begins until the beginning of the QRS complex. Calipers, marked paper or counting small boxes methods can be used to determine PR Intervals. Normally this interval is 0.12 to 0.20 seconds (3 to 5 small boxes) in adults, longer in elderly people. This interval shortens with increased heart rate.

Also evaluate if PR Intervals are constant or varying across the ECG strip. If they vary, determine if the variations are a steady lengthening until the point where an expected QRS does not appear.

ekg PR Interval


Authors and Sources

Authors and Reviewers


Sources




An error has occurred. This application may no longer respond until reloaded. Reload 🗙