Premature Atrial Complex | Reference Guide
EKG Features
Rate: Usually normal but depends on underlying rhythmRhythm: Irregular
P Wave: Premature, positive and shape is abnormal
PR Interval: Normal or longer
QRS: 0.10 sec or less
Premature atrial contractions are a common arrhythmia with early beats. PACs are caused by ectopic atrial sites firing an electrical signal before the next normal SA node fires. PACs can occur in healthy young and elderly patients. Premature atrial contractions are also called premature atrial complexes.
External Source: http://www.medicinenet.com/heart_rhythm_disorders/page2.htm
MedicineNet
