Monday, August 18, 2025 8/18/2025

Validation of a pediatric thrombosis risk assessment model and characterization of bleeding in hospitalized children through the Children's Hospital Acquired Thrombosis (CHAT) Consortium

Award Number: K23HL163330
ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: TRAINING/TRAINEESHIP
PERIOD OF PERFORMANCE START DATE: 08/01/2022
PERIOD OF PERFORMANCE END DATE: 07/31/2027

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Validation of a pediatric thrombosis risk assessment model and characterization of bleeding in hospitalized children through the Children's Hospital Acquired Thrombosis (CHAT) Consortium - PROJECT SUMMARY/ABSTRACT Venous thromboembolism (VTE), a serious and life-threatening condition, has increased in incidence for hospitalized pediatric patients by 70-200%. This has led to increased morbidity, mortality and longer hospitalizations, and is thought to be due to more effective care of children with serious and life-threatening disorders. Unfortunately, it is unclear which children are at the highest risk of hospital acquired (HA) VTE and how to prevent these events due to many studies being single center with small case numbers. This study addresses the critical need to identify children at a high risk of HA-VTE using a risk assessment model (RAM), but a low risk of bleeding. This cohort will be used as the target population for trials evaluating the efficacy and safety of prophylactic anticoagulation in order to progress towards the long term goal of HA-VTE prevention in children. The overall objectives of this study are to (1) prospectively validate a pediatric HA-VTE RAM created through Dr. Jaffray’s multi-center Children’s Hospital Acquired Thrombosis (CHAT) Consortium using a case-control study design and electronic medical record review (EMR); (2) evaluate the incidence and characterization of bleeding in hospitalized children on and off anticoagulation through EMR review; and (3) explore barriers to provider engagement with RAM implementation by conducting focus groups and semi- structured interviews of inpatient medical teams using qualitative thematic analysis strategies. To achieve these research aims, Dr. Jaffray has the immediate career goals to obtain new knowledge, skills, and experience that will allow her to (1) analyze data from large datasets from multicenter studies and build and validate risk models through multivariate analysis; (2) develop qualitative research skills to design and analyze focus groups and semi-structured interviews; and (3) acquire the knowledge to plan and conduct randomized controlled trials. Achieving these career goals will support her long term career goal of becoming an independently funded, leader in the effort to determine efficacious and safe VTE prevention strategies in children through multicenter randomized controlled trials. Dr. Jaffray will accomplish her research and training aims with the support of her primary mentor, Dr. Guy Young (pediatric thrombosis clinical research), and co-mentors, Dr. Neil Goldenberg (pediatric clinical trial research), Dr. Ernest Amankwah (biostatics), Dr. Neil Zakai (adult thrombosis clinical research) and Dr. Elizabeth Burner (qualitative research). Dr. Jaffray’s plan for career development is enhanced by the outstanding research environment at Children’s Hospital Los Angeles and The University of Southern California, which provides junior faculty members with numerous didactic and training opportunities designed specifically to facilitate the transition to research career independence. By completing her research and training aims, Dr. Jaffray will take the first necessary step in identifying children at high risk of HA- VTE who may safely benefit from prevention strategies and subsequently reduce the incidence of pediatric VTE.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2025 ( Subtotal = $171,288 )
2025	2025	UNIVERSITY OF CALIFORNIA, SAN DIEGO	9500 GILMAN DR	LA JOLLA	CA	92093	SAN DIEGO	USA	Blood Diseases and Resources Research	000	5	7/14/2025	NON-COMPETING CONTINUATION	$171,288
														Subtotal = $171,288

Issue Date FY: 2024 ( Subtotal = $171,288 )
2024	2024	UNIVERSITY OF CALIFORNIA, SAN DIEGO	9500 GILMAN DR	LA JOLLA	CA	92093	SAN DIEGO	USA	Blood Diseases and Resources Research	002	4	7/19/2024	NON-COMPETING CONTINUATION	$171,288
2024	2022	UNIVERSITY OF CALIFORNIA, SAN DIEGO	9500 GILMAN DR	LA JOLLA	CA	92093	SAN DIEGO	USA	Blood Diseases and Resources Research	001	2	12/20/2023	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	$1
2024	2022	CHILDREN'S HOSPITAL LOS ANGELES	4650 W SUNSET BLVD	LOS ANGELES	CA	90027	LOS ANGELES	USA	Blood Diseases and Resources Research	000	1	12/20/2023	NEW	-$1
														Subtotal = $171,288

Issue Date FY: 2023 ( Subtotal = $171,268 )
2023	2023	UNIVERSITY OF CALIFORNIA, SAN DIEGO	9500 GILMAN DRIVE	LA JOLLA	CA	92093	SAN DIEGO	USA	Blood Diseases and Resources Research	002	3	7/22/2023	NON-COMPETING CONTINUATION	$171,268
2023	2022	UNIVERSITY OF CALIFORNIA, SAN DIEGO	9500 GILMAN DR	LA JOLLA	CA	92093	SAN DIEGO	USA	Blood Diseases and Resources Research	001	2	12/22/2022	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	$171,091
2023	2022	CHILDRENS HOSPITAL LOS ANGELES	4650 W SUNSET BLVD	LOS ANGELES	CA	90027	LOS ANGELES	USA	Blood Diseases and Resources Research	000	1	12/21/2022	NEW	-$171,091
														Subtotal = $171,268

Issue Date FY: 2022 ( Subtotal = $171,092 )
2022	2022	CHILDRENS HOSPITAL LOS ANGELES	4650 W SUNSET BLVD	LOS ANGELES	CA	90027	LOS ANGELES	USA	Blood Diseases and Resources Research	000	1	7/29/2022	NEW	$171,092
														Subtotal = $171,092

Grand Total All Awards = $684,936

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Validation of a pediatric thrombosis risk assessment model and characterization of bleeding in hospitalized children through the Children's Hospital Acquired Thrombosis (CHAT) Consortium

Award Number: K23HL163330

ORGANIZATION: NATIONAL HEART, LUNG, & BLOOD INSTITUTE

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: TRAINING/TRAINEESHIP

PERIOD OF PERFORMANCE START DATE: 08/01/2022

PERIOD OF PERFORMANCE END DATE: 07/31/2027

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