Page 399 - ECG dr shamol_Slide

PR interval

•It is the distance between onsets of P wave to the beginning of Q wave

•It is the time require for impulse to travel SA node to ventricle muscle

•Normal PR interval: o.12 to .20

PR may be

Normal = (o.12 to .20 sec or 3 to 5 mm)

0
Prolong = (> 5 mm )1 heart block

Short = (< 3 mm )WPW syndrome

0
0
Variable = 2 / 3 heart block