Publications by authors named "Pettit A"

This report describes the first long-term survival following a heart transplant for Williams syndrome-associated cardiac pathologies. An 11-year-old patient with severe global left ventricular dysfunction presented with heart failure and underwent heart transplantation. Her peri- and post-operative courses were complicated by hypertension related to underlying vascular pathology.

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Background: Rapid antiretroviral therapy (ART) initiation, in which individuals with HIV start treatment within days of diagnosis, is a key component of the United States (US) Ending the HIV Epidemic initiative. The Memphis Metropolitan Statistical Area ranks second in the US for HIV incidence, yet only ∼60% of individuals link to treatment within 1 month of diagnosis. This study aimed to identify barriers and strategies for implementing rapid ART initiation in Memphis.

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Background: Familial hypercholesterolemia (FH) is an autosomal dominant genetic condition that carries increased risk for premature atherosclerotic cardiovascular disease, cardiovascular events, and death. Due to low uptake of evidence-based practices, up to 80% of FH patients remain undiagnosed and most are undertreated. This project aimed to understand patient and clinician perceptions across the care pathway of evidence-based diagnosis and treatment of FH, to inform implementation strategy design for two clinical trials seeking to increase evidence-based care.

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  • Monkeypox (mpox) has become more common and serious for people with HIV since 2022, with researchers looking into why some get sick and how others can protect themselves.
  • From a study of nearly 20,000 people living with HIV, 413 cases of mpox were found, with specific groups being more at risk, like younger people and those not on treatment for HIV.
  • The monkeypox vaccine was shown to be very effective, especially for people with a healthy immune system, but a lot of Black individuals with HIV were not getting vaccinated as often as others.
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Introduction: When used appropriately, focused limited-scope ultrasound exams could potentially provide paramedics with accurate and actionable diagnostic information to guide prehospital decision-making. In this study we aimed to investigate the impact of a 13-hour prehospital ultrasound training course on the simulated clinical decision-making of paramedics as well as their ultrasound skills, knowledge, and self-confidence.

Methods: We evaluated the ultrasound competence of 31 participants using post-course written and practical assessments.

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Since its Fast-Track approval by the Federal Drug Administration, the human papillomavirus (HPV) vaccine has been marked by controversies. Unconfirmed reports of adverse events in both Japan and Denmark led to suspensions of national vaccination programs, which setback the fight against cervical cancer and associated mortality and morbidity. Despite follow-up studies of vaccine adverse reports, additional randomized control trials, and review reports from both the World Health Organization and the European Commission, there is still a great deal of hesitancy around the vaccine.

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Background: People with HIV (PWH) are at elevated risk for atherosclerotic cardiovascular disease (ASCVD). Underrepresented racial and ethnic groups (UREGs) with HIV in the southern U.S.

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Apoptosis is crucial for tissue homeostasis and organ development. In bone, apoptosis is recognized to be a main fate of osteoblasts, yet the relevance of this process remains underexplored. Using our murine model with inducible Caspase 9, the enzyme that initiates intrinsic apoptosis, we triggered apoptosis in a proportion of mature osteocalcin (OCN) osteoblasts and investigated the impact on postnatal bone development.

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Background: In 2023, Tennessee replaced $6.2 M in US Centers for Disease Control and Prevention (CDC) human immunodeficiency virus (HIV) prevention funding with state funds to redirect support away from men who have sex with men (MSM), transgender women (TGW), and heterosexual Black women (HSBW) and to prioritize instead first responders (FR), pregnant people (PP), and survivors of sex trafficking (SST).

Methods: We used a simulation model of HIV disease to compare the clinical impact of Current, the present allocation of condoms, preexposure prophylaxis (PrEP), and HIV testing to CDC priority risk groups (MSM/TGW/HSBW); with Reallocation, funding instead increased HIV testing and linkage of Tennessee-determined priority populations (FR/PP/SST).

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The increased incidence of chronic diseases among people with HIV (PWH) is poised to increase the need for specialty care outside of HIV treatment settings. To reduce outcome disparities for HIV-associated comorbidities in the United States, it is critical to optimize access to and the quality of specialty care for underrepresented racial and ethnic minority (URM) individuals with HIV. We explored the experiences of URM individuals with HIV and other comorbidities in the specialty care setting during their initial and follow-up appointments.

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Background: Familial hypercholesterolemia (FH) is a heritable disorder affecting 1.3 million individuals in the USA. Eighty percent of people with FH are undiagnosed, particularly minoritized populations including Black or African American people, Asian or Asian American people, and women across racial groups.

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Importance: Elimination of tuberculosis (TB) disease in the US hinges on the ability of tests to detect individual risk of developing disease to inform prevention. The relative performance of 3 available TB tests-the tuberculin skin test (TST) and 2 interferon-γ release assays (IGRAs; QuantiFERON-TB Gold In-Tube [QFT-GIT] and SPOT.TB [TSPOT])-in predicting TB disease development in the US remains unknown.

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  • Macrophages and osteoclasts, which are crucial for bone health, rely on CSF1R signaling for their growth and survival.
  • Mutations in Csf1 and Csf1r lead to osteopetrosis, characterized by reduced osteoclasts and, consequently, impaired bone resorption.
  • A study in rats with Csf1r mutations showed that transferring healthy bone marrow helped restore bone development and highlighted the importance of osteal macrophages in normal bone growth.
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Background: Differences in male vs. female immune responses are well-documented and have significant clinical implications. While the immunomodulatory effects of sex hormones are well established, the contributions of sex chromosome complement (XX vs.

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Purpose: Incident HIV remains an important public health issue in the US South, the region leading the nation in HIV incidence, rural HIV cases, and HIV-related deaths. Late diagnoses drive incident HIV and understanding factors driving late diagnoses is critical for developing locally relevant HIV testing and prevention interventions, decreasing HIV transmission, and ending the HIV epidemic.

Methods: Retrospective cohort study utilizing Tennessee Department of Health (TDH) surveillance data and US Census Bureau data.

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Background: Psychological trauma is a highly prevalent driver of poor health among people with HIV (PWH) in the Southern United States (U.S.).

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Macrophages regulate metabolic homeostasis in health and disease. Macrophage colony-stimulating factor (CSF1)-dependent macrophages contribute to homeostatic control of the size of the liver. This study aimed to determine the systemic metabolic consequences of elevating circulating CSF1.

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Background: Differences in male vs. female immune responses are well-documented and have significant clinical implications. While the immunomodulatory effects of sex hormones are well established, the contributions of sex chromosome complement (XX vs.

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In this observational study, we assessed the extent to which a community-created pilot intervention, providing trauma-informed care for persons with HIV (PWH), affected HIV care retention and viral suppression among PWH attending an HIV Services Organization in the Southern US. PWH with trauma exposure and/or trauma symptoms (N = 166) were offered a screening and referral to treatment (SBIRT) session. Per self-selection, 30 opted-out, 29 received SBIRT-Only, 25 received SBIRT-only but reported receiving other behavioral health care elsewhere, and 82 participated in the Safety and Stabilization (S&S) Intervention.

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Background: Trauma-Informed Care (TIC) is an evidence-based approach for improving health outcomes by providing systematic, trauma- sensitive and -responsive care. Because TIC adoption varies by setting and population, Implementation Science (IS) is particularly well-suited to guide roll-out efforts. Process Mapping (PM) is an IS model for creating shared visual depictions of systems as to identify rate-limiting steps of intervention adoption, but guidance on to apply PM to guide TIC adoption is lacking.

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Article Synopsis
  • The single-cell analysis of tissue macrophages is affected by technical issues like low and biased cell yields, fragmentation, and activation during tissue breakdown.
  • These problems can result in incorrect identification of macrophage subpopulations and misrepresentation of macrophage-specific gene expression in other cell types.
  • Understanding these limitations is essential for accurately studying the diverse types of tissue-resident macrophages and their biological roles.
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Human Immunodeficiency Virus (HIV)-positive individuals lost to follow-up from particular clinics may not be lost to care (LTC). After linking Vanderbilt's Comprehensive Care Clinic cohort to Tennessee's statewide HIV surveillance database, LTC decreased from 48.4% to 35.

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Background: We previously identified 3 latent classes of healthcare utilization among people with human immunodeficiency virus (PWH): adherent, nonadherent, and sick. Although membership in the "nonadherent" group was associated with subsequent disengagement from human immunodeficiency virus (HIV) care, socioeconomic predictors of class membership remain unexplored.

Methods: We validated our healthcare utilization-based latent class model of PWH receiving care at Duke University (Durham, North Carolina) using patient-level data from 2015 to 2018.

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  • Underrepresented racial and ethnic groups (UREGs) with HIV are at a higher risk for cardiovascular disease (CVD), and consulting a cardiologist can improve their risk management.
  • This study evaluated 2,039 UREG individuals with HIV and borderline CVD risk between 2014-2020, finding that only 14% had seen a cardiologist, with factors like age, BMI, and urban residence influencing encounters.
  • The main drivers for seeing a cardiologist were existing CVD diagnoses, insurance status, and living in urban areas, highlighting the need for future research on how these encounters affect CVD care and outcomes in this population.
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