Jesús Díaz OTD, OTR/L
Associate Professor of Research
Room: CHP 222N
Jesús Díaz was born in Mexico City, Mexico, and was raised in Los Angeles. He completed his undergraduate, master’s and clinical doctorate degrees at the University of Southern California. He currently serves as associate professor of research with the Pressure Ulcer Prevention in Spinal Cord Injury Study. His roles in the study include overseeing recruitment and developing and implementing a fidelity measurement for intervention. Dr. Díaz also works as an occupational therapist providing early intervention services to children in their homes and in clinical settings.
Fidelity Measures, Spinal Cord Injury, Pressure Ulcers
Doctorate of Occupational Therapy (OTD)
2009 | University of Southern California
Master of Arts (MA)
in Occupational Therapy
2008 | University of Southern California
Bachelor of Arts (BA)
2005 | University of Southern California
Carlson, M., Vigen, C. L., Rubayi, S., Blanche, E. I., Blanchard, J., Atkins, M., Bates-Jensen, B., Garber, S. L., Pyatak, E. A., Díaz, J., Floríndez, L. I., Hay, J. W., Mallinson, T., Unger, J. B., Azen, S. P., Scott, M., Cogan, A., & Clark, F. (2019). Lifestyle intervention for adults with spinal cord injury: Results of the USC-RLANRC Pressure Ulcer Prevention Study. Journal of Spinal Cord Medicine, 42(1), 2–19. https://doi.org/10.1080/10790268.2017.1313931 Show abstract
Context/Objective. Medically serious pressure injuries (MSPrIs), a common complication of spinal cord injury (SCI), have devastating consequences on health and well-being and are extremely expensive to treat. We aimed to test the efficacy of a lifestyle-based intervention designed to reduce incidence of MSPrIs in adults with SCI.
Design. A randomized controlled trial (RCT), and a separate study wing involving a nonrandomized standard care control group.
Setting. Rancho Los Amigos National Rehabilitation Center, a large facility serving ethnically diverse, low income residents of Los Angeles County.
Participants. Adults with SCI, with history of one or more MSPrIs over the past 5 years: N=166 for RCT component, N=66 in nonrandomized control group.
Interventions. The Pressure Ulcer Prevention Program, a 12-month lifestyle-based treatment administered by healthcare professionals, largely via in-home visits and phone contacts.
Outcome Measures. Blinded assessments of annualized MSPrI incidence rates at 12 and 24 months, based on: skin checks, quarterly phone interviews with participants, and review of medical charts and billing records. Secondary outcomes included number of surgeries and various quality-of-life measures.
Results. Annualized MSPrI rates did not differ significantly between study groups. At 12 months, rates were .56 for intervention recipients, .48 for randomized controls, and .65 for nonrandomized controls. At follow-up, rates were .44 and .39 respectively for randomized intervention and control participants.
Conclusions. Evidence for intervention efficacy was inconclusive. The intractable nature of MSPrI threat in high-risk SCI populations, and lack of statistical power, may have contributed to this inability to detect an effect.
Trial Registration. ClinicalTrials.gov NCT01999816.
Pyatak, E. A., Carandang, K., Vigen, C. L., Blanchard, J., Díaz, J., Concha-Chavez, A., Sequeira, P. A., Wood, J. R., Whittemore, R., Spruijt-Metz, D., & Peters, A. L. (2018). Occupational therapy intervention improves glycemic control and quality of life among young adults with diabetes: The Resilient, Empowered, Active Living With Diabetes (REAL Diabetes) randomized controlled trial. Diabetes Care, 41(4), 696-704. https://doi.org/10.2337/dc17-1634 Show abstract
Objective. To assess the efficacy of a manualized occupational therapy (OT) intervention (Resilient, Empowered, Active Living with Diabetes [REAL Diabetes]) to improve glycemic control and psychosocial well-being among ethnically diverse young adults with low socioeconomic status (SES) who have type 1 or type 2 diabetes.
Research Design and Methods. Eighty-one young adults (age 22.6 ± 3.5 years; hemoglobin A1c [HbA1c] = 10.8%/95 mmol/mol ± 1.9%/20.8 mmol/mol) were randomly assigned to the REAL Diabetes intervention group (IG) or an attention control group (CG) over 6 months. IG participants received biweekly sessions guided by a manual composed of seven content modules; CG participants received standardized educational materials and biweekly phone calls. Blinded assessors collected data at baseline and 6 months. The primary outcome was HbA1c; secondary outcomes included diabetes self-care, diabetes-related quality of life (QOL), diabetes distress, depressive symptoms, and life satisfaction. Change scores were analyzed using Wilcoxon rank sum tests.
Results. Intent-to-treat analyses showed that IG participants showed significant improvement in HbA1c (-0.57%/6.2 mmol/mol vs. +0.36%/3.9 mmol/mol, P = 0.01), diabetes-related QOL (+0.7 vs. +0.15, P = 0.04), and habit strength for checking blood glucose (+3.9 vs. +1.7, P = 0.05) as compared with CG participants. There was no statistically significant effect modification by sex, ethnicity, diabetes type, recruitment site, or SES. No study-related serious adverse events were reported.
Conclusions. The REAL Diabetes intervention improved blood glucose control and diabetes-related QOL among a typically hard-to-reach population, thus providing evidence that a structured OT intervention may be beneficial in improving both clinical and psychosocial outcomes among individuals with diabetes.
Pyatak, E. A., Díaz, J., & Delgado, C. (2015). Engage/Trojan Neighbors: A community service partnership between an academic division and residential community. Work, 52(3), 503-508. https://doi.org/10.3233/WOR-152193 Show abstract
This paper describes the case of an after-school program, focused on providing enrichment opportunities for neighborhood youth, jointly administered through an academic division and residential community within a large urban research university. The program, originally conceived as an activity-based after-school program for middle school youth, expanded in scope in response to both community and student needs. The resident faculty fellow in this community served as a liaison between the academic division and office of residential education, helping maintain continuity and facilitating effective student leadership of the program. In this case, we detail the origins and evolution of the program, including strategies used to resolve challenges that arose over several years of program implementation.
Blanche, E. I., Díaz, J., Barretto, T., & Cermak, S. A. (2015). Caregiving experiences of Latino families with children with autism spectrum disorder. American Journal of Occupational Therapy, 69(5), 6905185010p1-6905185010p11. https://doi.org/10.5014/ajot.2015.017848 Show abstract
Objective. Prior research has documented caregiving difficulties in families of children with autism spectrum disorder (ASD). However, Latino families may encounter unique challenges. The purpose of this study was to understand the caregiving experiences of Latino families with children with ASD, including daily activities, coping strategies, and service utilization.
Method. Fifteen Latino parents of children with ASD were interviewed. The interviews were transcribed for analysis to identify themes of experiences unique to this population.
Results. Latino families of children with ASD encounter many similar issues as non-Latino families but also unique issues that affect service utilization. Four themes were identified: dealing with the diagnosis, dealing with stigma and isolation from family and community, understanding the role of mothers in changing family routines, and utilizing services.
Conclusion. To meet the unique needs of Latino families, services need to be provided in culturally sensitive context that address children's needs within family units.
Cogan, A. M., Blanche, E. I., Díaz, J., Clark, F. A., & Chun, S. (2014). Building a framework for implementing new interventions. OTJR: Occupation, Participation, and Health, 34(4), 209-220. https://doi.org/10.3928/15394492-20141009-01 Show abstract
Implementation into real-world practice of interventions previously studied in randomized controlled trials is an ongoing challenge. In this article, we describe the methodology we used for the first phase of a project for the implementation and outcomes assessment of an occupational therapy pressure ulcer prevention intervention for people with spinal cord injury in the Veterans Health Administration. This first phase of the project was guided by practice-based evidence research methodology and resulted in an intervention manual tailored to meet the needs of Veterans and the establishment of a system for documenting and monitoring care processes, patient characteristics, and intervention outcomes. This system, in turn, will provide the data-gathering template for the next phase in which the beneficial effects of the intervention will be assessed. We conclude by recommending that clinicians explore the utility of this approach for the implementation of other novel interventions.
Clark, F., Pyatak, E. A., Carlson, M., Blanche, E. I., Vigen, C., Hay, J., Mallinson, T., Blanchard, J., Unger, J. B., Garber, S. L., Díaz, J., Floríndez, L. I., Atkins, M., Rubayi, S., & Azen, S. P. (2014). Implementing trials of complex interventions in community settings: The USC-Rancho Los Amigos Pressure Ulcer Prevention Study (PUPS). Clinical Trials, 11(2), 218-229. https://doi.org/10.1177/1740774514521904 Show abstract
Background. Randomized trials of complex, non-pharmacologic interventions implemented in home and community settings, such as the University of Southern California (USC)-Rancho Los Amigos National Rehabilitation Center (RLANRC) Pressure Ulcer Prevention Study (PUPS), present unique challenges with respect to (1) participant recruitment and retention, (2) intervention delivery and fidelity, (3) randomization and assessment, and (4) potential inadvertent treatment effects.
Purpose. We describe the methods employed to address the challenges confronted in implementing PUPS. In this randomized controlled trial, we are assessing the efficacy of a complex, preventive intervention in reducing the incidence of, and costs associated with, the development of medically serious pressure ulcers in people with spinal cord injury.
Methods. Individuals with spinal cord injury recruited from RLANRC were assigned to either a 12-month preventive intervention group or a standard care control group. The primary outcome is the incidence of serious pressure ulcers with secondary endpoints including ulcer-related surgeries, medical treatment costs, and quality of life. These outcomes are assessed at 12 and 24 months after randomization. Additionally, we are studying the mediating mechanisms that account for intervention outcomes.
Results. PUPS has been successfully implemented, including recruitment of the target sample size of 170 participants, assurance of the integrity of intervention protocol delivery with an average 90% treatment adherence rate, and enactment of the assessment plan. However, implementation has been replete with challenges. To meet recruitment goals, we instituted a five-pronged approach customized for an underserved, ethnically diverse population. In intervention delivery, we increased staff time to overcome economic and cultural barriers to retention and adherence. To ensure treatment fidelity and replicability, we monitored intervention protocol delivery in accordance with a rigorous plan. Finally, we have overcome unanticipated assessment and design concerns related to (1) determining pressure ulcer incidence/severity, (2) randomization imbalance, and (3) inadvertent potential control group contamination.
Limitations. We have addressed the most daunting challenges encountered in the recruitment, assessment, and intervention phases of PUPS. Some challenges and solutions may not apply to trials conducted in other settings.
Conclusions. Overcoming challenges has required a multifaceted approach incorporating individualization, flexibility, and persistence, as well as the ability to implement needed mid-course corrections.
Pyatak, E. A., Blanche, E. I., Garber, S. L., Díaz, J., Blanchard, J., Floríndez, L., & Clark, F. A. (2013). Conducting intervention research among underserved populations: Lessons learned and recommendations for researchers. Archives of Physical Medicine and Rehabilitation, 94(6), 1190-1198. https://doi.org/10.1016/j.apmr.2012.12.009 Show abstract
Randomized controlled trials (RCTs) are considered the criterion standard in research design for establishing treatment efficacy. However, the rigorous and highly controlled conditions of RCTs can be difficult to attain when conducting research among individuals living with a confluence of disability, low socioeconomic status, and being a member of a racial/ethnic minority group, who may be more likely to have unstable life circumstances. Research on effective interventions for these groups is urgently needed, because evidence regarding approaches to reduce health disparities and improve health outcomes is lacking. In this methodologic article, we discuss the challenges and lessons learned in implementing the Lifestyle Redesign for Pressure Ulcer Prevention in Spinal Cord Injury study among a highly disadvantaged population. These issues are discussed in terms of strategies to enhance recruitment, retention, and intervention relevance to the target population. Recommendations for researchers seeking to conduct RCTs among socioeconomically disadvantaged, ethnically diverse populations are provided.
Blanche, E. I., Fogelberg, D., Díaz, J., Carlson, M. E., & Clark, F. A. (2011). Manualization of occupational therapy interventions: Illustrations from the Pressure Ulcer Prevention Research Program. American Journal of Occupational Therapy, 65(6), 711-719. https://doi.org/10.5014/ajot.2011.001172 Show abstract
The manualization of a complex occupational therapy intervention is a crucial step in ensuring treatment fidelity for both clinical application and research purposes. Toward the latter end, intervention manuals are essential for ensuring trustworthiness and replicability of randomized controlled trials that aim to provide evidence of the effectiveness of occupational therapy. In this article, we review the literature on the process of intervention manualization. We then illustrate the prescribed steps through our experience in implementing the University of Southern California/Rancho Los Amigos National Rehabilitation Center's collaborative Pressure Ulcer Prevention Project. In this research program, qualitative research provided the initial foundation for manualization of a multifaceted occupational therapy intervention designed to reduce the incidence of medically serious pressure ulcers in adults with spinal cord injury.