Premature Contractions - PACs and PVCs | American Heart Association
https://www.heart.org/en/health-topics/arrhythmia/about-arrhythmia/premature-contractions-pacs-and-pvcs
WEBNov 14, 2022 · Premature beats that start in your heart’s upper chambers are premature atrial contractions, or PACs. Those that start in the lower chambers are premature ventricular contractions, or PVCs. Watch an animation of a normal heartbeat. Testing and treatment. Infrequently, premature contractions can be caused by disease or injury to …
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