"I still can't get my head around CHADS scoring which I am zero on. As surely AF is AF how can I be at lesser risk of blood clots than someone with a score of 1,2 or 3 ? and indeed if there's no difference what is the point of even mentioning chad score?"
This is a link to the original posting so please go back there if it's still active to continue the discussion... healthunlocked.com/afassoci...
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Well I'm afraid you're quite right to be puzzled - the answer is we don't know why. It's just what has been found by looking at the statistical occurrence of strokes in people with AF.
For young people with no other cardiovascular disease it hardly ever happens. This means that over a year or more the very small risk of life-threatening bleeding from taking anticoagulants is actually worse than the risk of having a stroke if you don't take them. So obviously it's not worth taking anticoagulants long term.
Older people and those with high blood and heart disease who are in AF have a higher risk of stroke if they don't take anticoagulants so if you add up the risk factors (the CHADS score) and it's more than 1 they probably have a higher risk from clots / stroke than they do from the bleeding risk of anticoagulation – so then it IS worth taking anticoagulation.
Just one risk factor (CHADS score=1) is borderline and there is no solid evidence of benefit though most "expert groups" recommend starting anticoagulation unless there is some problem with it. Unfortunately, with large profits being made from the new oral anticoagulants (NOACs) there is a lot of pressure on the "expert groups" NOT to do the obvious trial comparing anticoagulation with placebo for CHADS=1 AF patients. So we may never get evidence either way.
The important thing to understand is that there is no zero-risk option but the risks are very low indeed if your CHADS score is zero.