Did you know that Premature atrial contractions (PACs) are a common trigger for atrial fibrillation (AFib)?

# Understanding PAC

PACs occur when the atria contract earlier than they should before the heart’s natural pacemaker (the sinoatrial node) sends its signal. This interrupts the normal rhythm and is often followed by a pause, creating the feeling of a skipped or forceful heartbeat.

# Where Are PACs More Common?

More common in people with COPD, heart failure, diabetes, high blood pressure, and those with a history of heart attack, and while most PACs are harmless, frequent or persistent ones may increase the risk of AFib if left unaddressed

# The Connection Between PACs and AFib

**PACs can trigger AFib**  
Many AFib episodes begin with PACs, especially those originating in the pulmonary veins.  
  
**Frequent PACs increase AFib risk**  
A higher PAC burden is linked to a 2–3x increased risk of developing AFib.  
  
**More PACs, higher risk**  
Risk rises with frequency. Very high counts (e.g., thousands per day) significantly elevate AFib and stroke risk.

**They can reshape the heart**  
Frequent PACs may lead to atrial remodeling, creating conditions that sustain AFib.  
  
**May indicate underlying heart issues**  
High PAC burden can signal atrial cardiomyopathy, increasing susceptibility to AFib.  
  
**Linked to stroke and mortality**  
Often associated with higher risks due to undetected AFib or shared risk factors.  
  
**Occasional vs frequent matters**  
Occasional PACs are usually harmless. Frequent PACs warrant closer monitoring and evaluation.

To learn more about PACs, their causes, symptoms, and risks, click to[ read the full article.](https://blog.fourthfrontier.com/understanding-pacs-causes-symptoms-risks/)

  
**How Long-term ECG Monitoring Helps You Detect and Manage Heart Issues Early**

[Continuous heart monitoring](https://fourthfrontier.com/products/frontier-x?utm_source=reddit&utm_medium=PACandafib&utm_campaign=blog) helps you catch patterns that occasional checks often miss, especially when it comes to PACs and early signs of AFib. Tracking your heart over time gives you a clearer picture of what is normal and what is changing.

* Capture PACs and irregular rhythms as they happen
* Tracks frequency and trends over time
* Helps identify early risk of AFib
* Enables timely action and better medical conversations

With continuous data, you move from reacting late to managing your heart health early.



The Connection between PAC and AFib