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Authors’ response
  1. A M Veitch1,
  2. T P Baglin2
  1. 1
    Department of Gastroenterology, New Cross Hospital, Wolverhampton, UK
  2. 2
    Department of Haematology, Addenbrooke’s Hospital, Cambridge, UK
  1. Dr A M Veitch, New Cross Hospital, Wolverhampton, WV10 0QP, UK; andrew.veitch{at}

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We thank Dr Gorard for highlighting the risks of thromboembolism associated with non-valvular atrial fibrillation. The CHADS2 tool quantifies this risk,1 and patients with the highest risk have comparable rates of thromboembolic risk to those with mechanical valve prostheses. Our guidelines have classified non-valvular atrial fibrillation as a low-risk condition in the figure and tables, although risk stratification according to CHADS2 is referred to in the text. We agree that those with high CHADS2 scores have a high relative risk of thrombosis, although the absolute risk over the period of discontinuation of therapy for a high risk endoscopic procedure is low. Dr Gorard notes a disparity …

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