Andexanet Alfa and 4F-PCC Use in Patients Hospitalised With an Anticoagulant-related Major Bleed

This observational study will include adult US patients treated with andexanet alfa or 4F-PCC during a hospitalization for an anticoagulation-related major bleed. Data will be collected via an audit of electronic medical charts. The primary objectives are to describe the patients' characteristics, treatments and outcomes, including length of stay and in-hospital mortality. Secondary objectives include subgroup analyses, including by bleed location. Potential differences between patients treated with andexanet alfa versus 4F-PCC, and potential differences in patient characteristics over time, will be assessed. If this assessment confirms that treatment groups can be adequately balanced and that patient characteristics have not substantially changed over time (i.e. no channeling bias is observed), the risk of in-hospital mortality with andexanet alfa versus 4F-PCC will be assessed in a comparative effectiveness analysis. If treatment groups cannot be balanced or clear signs of channelling bias are observed, the comparative analyses will be considered unfeasible and will not be performed.