New FAQ: What is Atypical Flutter?
“I have Atrial Flutter that my EP describes as “atypical”. What does that mean? Is it treated differently than typical Flutter? (I’ve had two ablations, many cardioversions, and a Watchman installed to close off my LAA.)”
Atrial Flutter is similar but different from Atrial Fibrillation. Atrial Flutter is characterized by rapid, organized contractions of individual heart muscle fibers (see graphic below).
In general, there are two types of Atrial Flutter:
• Typical Flutter (from the right atrium)
• Atypical Flutter (can come from anywhere)
Typical Flutter originates in the right atrium (whereas A-Fib usually comes from the left atrium).
Atypical Flutter can come from anywhere and is one of the most difficult arrhythmias to map and ablate.
To learn more, read my full answer, go to: “I have Atrial Flutter that my EP describes as “atypical”. What does that mean?”

A-Flutter usually comes from the right atrium (A-Fib usually comes from the left atrium).