I'll look up atrial fibrillation from the medical library and check for the latest evidence. Let me start by reading the medical library skill.

Now let me search the library and PubMed in parallel for AF content.

Good. The user asked about "atrial fibrillation harrison latest stage" - they want the Harrison's classification/staging of AF. Let me search specifically for Harrison's AF content and also the main Braunwald's section on AF staging.

I found Harrison's 22nd Edition (2025) has a dedicated AF section. Let me read it now, along with the staging-specific content.

Let me now read the full Harrison's AF section including staging, classification, and the specific content starting around line 1068.

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