Table 8 Common types of PR interval abnormalities
Normal PR interval • Measured from the beginning of
P wave to the beginning of QRS complex. It varies from 0.12 seconds to 0.2 seconds (3-5 mm)
Prolonged PR interval • This is often referred to as first degree
heart block and the PR interval is >0.2 seconds (>5 mm)
Short PR interval • PR interval is <0.12 seconds (<3 mm).