Let me explain
The upper chambers in the heart
are more "irritable" than the main chambers.
In other words, they are more likely to produce prematurebeats (pacs). A few examples:
which is more common- a-fib (atrial) or v-fib (ventricular)?
Which is more common- svt (atrial) or VT (v-tach) (ventricular)?
Both pacs and pvcs are usually benign, so it's really not an issue.
Ask your doctor also please.