EKG #'s

PR interval:
- Normal = 0.12 - 0.20sec. (3-5ss)


QRS:

- narrow = less than 1 big box (<0.11 sec.)

- wide = larger than 1 big box (>0.12 sec.)

Read more:

https://www.dropbox.com/s/xao9lec9yuqa9nz/13.0-%20ACLS-2013-e-PUB-SVT%20Uncertain-%2810-13.11-2014%29-LOCK.pdf?dl=0#

http://lifeinthefastlane.com/ecg-library/basics/pr-interval/