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Premature atrial contraction


Premature Atrial Contractions (PACs), Animation.


Premature atrial contractions - an Osmosis Preview


One Quick Question: What are PACs (Premature Atrial Contractions)?


EMS Cardiology || Tachy Tuesday: Premature Atrial Contractions


MCP 60 Seconds With Dr Lin Yee Chen on Premature Atrial Contractions

Premature atrial contractions (PACs), also known as atrial premature complexes (APC) or atrial premature beats (APB), are a common cardiac dysrhythmia characterized by premature heartbeats originating in the atria. While the sinoatrial node typically regulates the heartbeat during normal sinus rhythm, PACs occur when another region of the atria depolarizes before the sinoatrial node and thus triggers a premature heartbeat. The exact cause of PACs is unclear; while several predisposing conditions exist, PACs commonly occur in healthy young and elderly people. Elderly people that get PACs usually don't need any further attention besides follow ups due to unclear evidence. PACs are often completely asymptomatic and may be noted only with Holter monitoring, but occasionally they can be perceived as a skipped beat or a jolt in the chest. In most cases, no treatment other than reassurance is needed for PACs, although medications such as beta blockers can reduce the frequency of symptomatic PACs.
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  • Risk factors 

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  • Prognosis 

  • Supraventricular extrasystole