Premature Atrial Contraction (Complex)

Premature Atrial Contraction (Complex)

P to P is regular, P to P shortens with PAC, rate depends on underlying rhythm

P wave before every QRS complex; premature P wave usually different from sinus initiated complex.

Unchanged unless aberrant conduction due to premature beat or increased rate

PR: 0.12 to 0.20 sec

QRS: <0.12 sec