30 June 2021: We further corrected recommendation 1.2.2 on using the ORBIT score to assess bleeding risk to reinstate the link to the previous calculation tool, which was amended in error on 10 June. The tool includes the full criteria, including options for reduced haemoglobin and reduced haematocrit which are available once the patient's sex has been selected.
10 June 2021: We amended recommendation 1.2.2 on using the ORBIT score to assess bleeding risk so that it links to a calculation tool that includes the full list of criteria, including reduced haemoglobin, reduced haematocrit and history of anaemia. We deleted a paragraph of text from the rationale and impact section for recommendation 1.8.3 that was included incorrectly.
April 2021: We have reviewed the evidence and made new recommendations on diagnosis and assessment, assessment of stroke and bleeding risks, preventing stroke, rate and rhythm control, preventing recurrence, and preventing and managing postoperative atrial fibrillation. These recommendations are marked .
Recommendations marked  and  last had an evidence review in 2014 and 2006 respectively. In some cases, minor changes have been made to the wording for clarity and to bring the language and style up to date, without changing the meaning.
Minor changes since publication
January 2022: Minor changes to redirect NICE Pathways links.
October 2021: We added a link to NICE's shared decision making guideline in recommendation 1.4.2.