I've had every possible treatment for afib but not cured.
My cardiologists explanation might help you understand the reason
Atrial fibrillation causes problems such as heart failure.
Afib arises from the L atrium which like the R atrium is a very thin walled chamber.
When AF occurs and is long standing, the atria enlarge. It always happens.
The enlargement is an expected accompaniment of AF so we need to treat the heart failure differently