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Abstract Background Bleeding in people with hemophilia A can be life threatening, and intra‐articular bleeds can result in joint damage. Most clinical studies focus on treated bleeds, while bleeds not treated with coagulation factor(s) (untreated bleeds) are underreported. Objectives We assessed the incidence of untreated bleeds during a noninterventional study (NIS) wherein people with hemophilia A, with or without factor VIII (FVIII) inhibitors, were managed according to standard practice. Patients/Methods Using the Bleed and Medication Questionnaire, we prospectively collected data from three cohorts: Cohort A, adults/adolescents (age ≥12 years) with FVIII inhibitors; Cohort B, children (aged

Background: Recurrent hemarthrosis and resultant hemophilic arthropathy are significant causes of morbidity in persons with hemophilia, despite the marked evolution of hemophilia care. Prevention, timely diagnosis, and treatment of bleeding episodes are key. However, a physical examination or a patient’s assessment of musculoskeletal pain may not accurately identify a joint bleed. This difficulty is compounded as hemophilic arthropathy progresses. Objectives: Our system aims to utilize artificial intelligence and ultrasonography (US; point-of-care and handheld) to enable providers, and ultimately patients, to detect joint bleeds at the bedside and at home. We aimed to develop and assess the reliability of artificial intelligence algorithms in detecting and segmenting synovial recess distension (SRD; an indicator of disease activity) on US images of adult and pediatric knee, elbow, and ankle joints. Methods: A total of 12,145 joint exams, comprising 61,501 US images from 7 international healthcare centers, were collected. The dataset included healthy participants and adult and pediatric persons with hemophilia, with and without SRD. Images were manually labeled by 2 experts and used to train binary convolutional neural network classifiers and segmentation models. Metrics to evaluate performance included accuracy, sensitivity, specificity, and area under the curve. Results: The algorithms exhibited high performance across all joints and all cohorts. Specifically, the knee model showed an accuracy of 97%, sensitivity of 96%, specificity of 97%, and an area under the curve of 0.97 in SRD. High Dice coefficients (80%-85%) were achieved in segmentation tasks across all joints. Conclusion: This technology could assist with the early detection and management of hemarthrosis in hemophilia.

Abstract Background N8‐GP is an extended half‐life recombinant factor VIII developed for prophylaxis and treatment of bleeds in patients with hemophilia A. Objective To assess pharmacokinetic (PK) characteristics of N8‐GP in previously treated patients with severe hemophilia A, model the time spent at hemophilia thresholds of ≥1 and ≤5 IU/dL (moderate) or >5 IU/dL (mild) FVIII levels during N8‐GP prophylaxis, and investigate the relationship between N8‐GP half‐life and von Willebrand factor (vWF). Methods PK assessments were obtained from patients with severe hemophilia A (FVIII < 1 IU/dL) participating in 4 clinical trials: pathfinder 1 (20‐60 years); pathfinder 2 (12‐17 and ≥18 years); pathfinder 5 (0‐11 years), and pathfinder 7 (25‐71 years). All PK profiles were assessed after washout and considered single‐dose PK profiles. Pre‐ and postdose FVIII activity at steady state was measured at all visits. Results From 69 patients, 108 PK profiles of N8‐GP 50 IU/kg were assessed. Adults/adolescents received 50 IU/kg every 4 days, achieving mean trough levels of 3.0 IU/dL (95% confidence interval, 2.6‐3.5, adults) and 2.7 IU/dL (1.8‐4.0, adolescents). Children received 60 IU/kg twice weekly, leading to mean trough levels of 1.2 IU/dL (0.8‐1.6, 0‐ to 5‐year‐olds) and 2.0 IU/dL (1.5‐2.7, 6‐ to 11‐year‐olds). PK modeling predicted children dosed every 3 days and adults/adolescents dosed every 3 to 4 days would maintain FVIII levels >5 and >1 IU/dL for >80% and 100% of the time, respectively. N8‐GP half‐life correlated linearly with von Willebrand factor levels in adults/adolescents, less in children. Conclusions Prophylaxis with fixed intervals (Q4D/twice weekly) and fixed weight‐based dosing (50/60 IU/kg) ensured >1 IU/dL FVIII trough levels in both adults and children.

Introduction: Haemophilia is a rare disease and its management can pose a challenge to Emergency Department paediatricians. Aim: To describe the frequency and reasons for consultation by haemophilic children in the ED. Materials and methods: Longitudinal retrospective study was conducted in a paediatric Emergency Department of a tertiary care hospital. The study included haemophiliacs A and B, ages 0 to 16 years old, and who had consulted the Emergency Department for whatever reason over a span of 6 years (2011–2016). The data analysed include: age, type and severity of haemophilia, reason for query, prophylactic status, complementary examinations, established diagnosis, treatment, and number of visits to the Emergency Department. Results: The analysis included 116 males with a total of 604 Emergency Department visits. The mean age was 5.5 years, and the median age was 5.3 years. A total of 101 patients were categorised as haemophiliac A (38 mild, 4 moderate, 59 severe), and 15 as haemophiliac B (9 mild, 3 moderate, 3 severe). The main reasons for initial Emergency Department visits (ranked by triage) were: musculoskeletal problems/injury or bleeding (66.7%), causes unrelated to haemophilia (29%), suspected central venous catheter related infection (2.8%), and routine clotting factor infusion (1.5%). Additional tests were conducted during 335 visits (55.5%). Factor replacement was undertaken in 317 visits (52.5%). A total of 103 episodes (17.1%) required hospital admission, due to: head trauma (35.9%), central venous catheter -related infection (13.6%), haemarthrosis (8.7%), muscle haematoma (6.8%), and haematuria (5.8%). Conclusion: Haemophilic patients went to the Emergency Department for common paediatric causes, but also requested consultation on specific problems related to haemophilia, with musculoskeletal problems/injury or bleeding being the main issues. The paediatric Emergency Department is an indispensable component of haemophilia care. Resumen: Introducción: La hemofilia es una enfermedad rara, por lo que su abordaje en Urgencias puede suponer un reto para los pediatras. Objetivos: Describir la frecuencia y motivos de consulta de los niños hemofílicos en Urgencias. Material y métodos: Estudio retrospectivo longitudinal realizado en Urgencias Pediátricas de un hospital de tercer nivel. Se incluyeron hemofílicos A y B, desde el nacimiento hasta los 16 años, que consultaron por cualquier motivo durante 6 años (2011-2016). Se analizaron: edad, tipo y gravedad de hemofilia, motivo de consulta, profilaxis domiciliaria frente a sangrados, pruebas complementarias, diagnóstico establecido, tratamiento y número de visitas a Urgencias. Resultados: Se analizaron 116 varones con un total de 604 visitas. La media de edad fue de 5,5 años y la mediana de 5,3. De ellos, 101 pacientes eran hemofílicos A (38 leves, 4 moderados, 59 graves) y 15 hemofílicos B (9 leves, 3 moderados, 3 graves). Los principales motivos de consulta (clasificados en triaje) fueron: problema musculoesquelético/traumático o sangrado (66,7%), causas no relacionadas con hemofilia (29%), sospecha de infección de catéter central (2,8%) y administración rutinaria de factor (1,5%). Se realizaron pruebas complementarias en 335 visitas (55,5%). Del total, 317 consultas (52,5%) requirieron factor; 103 episodios (17,1%) precisaron ingreso, cuyos principales motivos fueron: traumatismo craneoencefálico (35,9%), infección de catéter venoso central (13,6%), hemartrosis (8,7%), hematoma muscular (6,8%) y hematuria (5,8%). Conclusión: Los pacientes consultaron por causas habituales de la edad pediátrica, pero también lo hicieron por motivos específicos de su enfermedad; lo más frecuente fue el problema musculoesquelético/traumático o sangrado. El Servicio de Urgencias es un componente indispensable en su atención.

Resumen: Introducción: La hemofilia es una enfermedad rara, por lo que su abordaje en Urgencias puede suponer un reto para los pediatras. Objetivos: Describir la frecuencia y motivos de consulta de los niños hemofílicos en Urgencias. Material y métodos: Estudio retrospectivo longitudinal realizado en Urgencias Pediátricas de un hospital de tercer nivel. Se incluyeron hemofílicos A y B, desde el nacimiento hasta los 16 años, que consultaron por cualquier motivo durante 6 años (2011-2016). Se analizaron: edad, tipo y gravedad de hemofilia, motivo de consulta, profilaxis domiciliaria frente a sangrados, pruebas complementarias, diagnóstico establecido, tratamiento y número de visitas a Urgencias. Resultados: Se analizaron 116 varones con un total de 604 visitas. La media de edad fue de 5,5 años y la mediana de 5,3. De ellos, 101 pacientes eran hemofílicos A (38 leves, 4 moderados, 59 graves) y 15 hemofílicos B (9 leves, 3 moderados, 3 graves). Los principales motivos de consulta (clasificados en triaje) fueron: problema musculoesquelético/traumático o sangrado (66,7%), causas no relacionadas con hemofilia (29%), sospecha de infección de catéter central (2,8%) y administración rutinaria de factor (1,5%). Se realizaron pruebas complementarias en 335 visitas (55,5%). Del total, 317 consultas (52,5%) requirieron factor; 103 episodios (17,1%) precisaron ingreso, cuyos principales motivos fueron: traumatismo craneoencefálico (35,9%), infección de catéter venoso central (13,6%), hemartrosis (8,7%), hematoma muscular (6,8%) y hematuria (5,8%). Conclusión: Los pacientes consultaron por causas habituales de la edad pediátrica, pero también lo hicieron por motivos específicos de su enfermedad; lo más frecuente fue el problema musculoesquelético/traumático o sangrado. El Servicio de Urgencias es un componente indispensable en su atención. Abstract: Introduction: Haemophilia is a rare disease and its management can pose a challenge to Emergency Department paediatricians. Aim: To describe the frequency and reasons for consultation by haemophilic children in the ED. Materials and methods: Longitudinal retrospective study was conducted in a paediatric Emergency Department of a tertiary care hospital. The study included haemophiliacs A and B, ages 0 to 16 years old, and who had consulted the Emergency Department for whatever reason over a span of 6 years (2011-2016). The data analysed include: age, type and severity of haemophilia, reason for query, prophylactic status, complementary examinations, established diagnosis, treatment, and number of visits to the Emergency Department. Results: The analysis included 116 males with a total of 604 Emergency Department visits. The mean age was 5.5 years, and the median age was 5.3 years. A total of 101 patients were categorised as haemophiliac A (38 mild, 4 moderate, 59 severe), and 15 as haemophiliac B (9 mild, 3 moderate, 3 severe). The main reasons for initial Emergency Department visits (ranked by triage) were: musculoskeletal problems/injury or bleeding (66.7%), causes unrelated to haemophilia (29%), suspected central venous catheter related infection (2.8%), and routine clotting factor infusion (1.5%). Additional tests were conducted during 335 visits (55.5%). Factor replacement was undertaken in 317 visits (52.5%). A total of 103 episodes (17.1%) required hospital admission, due to: head trauma (35.9%), central venous catheter -related infection (13.6%), haemarthrosis (8.7%), muscle haematoma (6.8%), and haematuria (5.8%). Conclusion: Haemophilic patients went to the Emergency Department for common paediatric causes, but also requested consultation on specific problems related to haemophilia, with musculoskeletal problems/injury or bleeding being the main issues. The paediatric Emergency Department is an indispensable component of haemophilia care.