HTRS2023.P2.6 Burden of Disease and Impact on Quality of Life in Hereditary Factor X Deficiency Patients Who Have Experienced Menorrhagia: Findings from the Hereditary Factor X Deficiency in America Survey

S25 of S58stable or improved HEAD-US scores on subsequent ultrasound sets.The median ABR pre-and post-emicizumab demonstrated decrease in ABR in the post-emicizumab group (p=0.0007). Conclusions: Emicizumab may prevent development or progressionof hemophilic arthropathy.A larger, prospective data cohort will be necessary to further prove effectiveness.