Clinical guidelines for the assessment and management of atrial fibrillation emphasize the importance of taking the patient’s preferences into account. A detailed examination of those from the National Institute for Excellence in Health and Social Care (NICE) raise serious questions about whether the recommendations embed preferences about crucial trade-offs that pre-empt those of the patient; do not stress the need to provide them with the information on option consequences necessary for them to become an informed patient; and characterise them as ‘concordant’ or ‘discordant’ rather than independently valid. American and European guidelines do not differ significantly in these respects.