# Hemorrhagic Complications in Patients with Atrial Fibrillation Treated with Novel Oral Anticoagulants: Results from the CRAFT Study

## TL;DR

This study identifies factors that increase bleeding risk in atrial fibrillation patients taking new anticoagulants and creates a tool to predict and manage this risk.

## Contribution

The novel contribution is the development of the CRAFT bleeding score to predict hemorrhagic events in AF patients on DOACs.

## Key findings

- 17.4% of patients experienced bleeding episodes during a four-year follow-up.
- Nine clinical factors were identified as predictors of bleeding complications.
- The CRAFT bleeding score was developed to guide monitoring and minimize bleeding risks.

## Abstract

Background/Objectives: Hemorrhagic complications are among the most common adverse events of anticoagulant therapy in patients with atrial fibrillation (AF). Non-vitamin K antagonist oral anticoagulants (DOACs) are known to be more effective than vitamin K antagonists (VKAs) in preventing thromboembolism. The aim was to identify clinical factors associated with hemorrhagic events in AF patients treated with DOACs and to develop a simple, clinically applicable bleeding risk score. Methods: Data were derived from the multicenter CRAFT trial (NCT02987062). We conducted a retrospective analysis of hospital records of 1435 AF patients (median age: 67 years; 44.8% female) treated with dabigatran or rivaroxaban. The main study endpoints were the occurrence of a bleeding episode, thromboembolic episode, or all-cause death during a mean four-year follow-up (1531 [1062–2140] days). Results: The rates of bleeding episodes, thromboembolic episodes, and all-cause death were 17.4%, 13.5%, and 23.9%, respectively. Nine factors were identified as predictors of bleeding complications: male sex, history of major bleeding, history of cancer, COPD, CRT, rivaroxaban therapy, statin therapy, age, and absence of heart failure. Based on these, the CRAFT bleeding score was developed to predict the risk of hemorrhagic events in individual patients. Conclusions: The CRAFT bleeding score may be implemented in AF patients as an additional tool for evaluating DOACs safety prior to initiating anticoagulant therapy, and for guiding closer monitoring of high-risk individuals to minimize bleeding complications.