Publications by authors named "Ryan McMahan"

Matching avatar characteristics to a user can impact sense of embodiment (SoE) in YR. However, few studies have examined how participant demographics may interact with these matching effects. We recruited a diverse and racially balanced sample of 78 participants to investigate the differences among participant groups when embodying both demographically matched and unmatched avatars.

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Background: Advance care planning (ACP) has been reconceptualized as a health behavior. Action plans (APs), or patient-directed mini contracts, improve behavior change. However, no prior studies have assessed whether APs can increase ACP documentation and engagement.

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Advance care planning (ACP) has evolved from a narrow focus on end-of-life preference, such as resuscitation, to a continuum of care planning across the life course. Older adults with kidney disease have high morbidity and mortality, and easy-to-use tools can make ACP easier for patients and clinicians.

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In many consumer virtual reality (VR) applications, users embody predefined characters that offer minimal customization options, frequently emphasizing storytelling over user choice. We explore whether matching a user's physical characteristics, specifically ethnicity and gender, with their virtual self-avatar affects their sense of embodiment in VR. We conducted a $2\times 2$ within-subjects experiment ($\mathrm{n}=32$) with a diverse user population to explore the impact of matching or not matching a user's self-avatar to their ethnicity and gender on their sense of embodiment.

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Advance care planning (ACP) has been recognized as crucial by patients, families, and clinicians; however, different definitions and measurements have led to inconsistencies in practice and mixed evidence in the literature. This narrative review explores ACP's evolution, innovations, and outcomes using thematic analysis to synthesize data from randomized controlled trials, reviews, and editorials. Key findings include (1) ACP has evolved over the past several decades from a sole focus on code status and advance directive (AD) forms to a continuum of care planning over the life course focused on tailored preparation for patients and surrogate decision-makers and (2) ACP measurement has evolved from traditional outcome metrics, such as AD completion, to a comprehensive outcomes framework that includes behavior change theory, systems, implementation science, and a focus on surrogate outcomes.

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Surrogate decision makers are required to make difficult end-of-life decisions with little preparation. Little is known about what surrogates may need to adequately prepare for their role, and few resources exist to prepare them. To explore experiences and advice from surrogates about how best to prepare for the surrogate role.

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Target and steering-based techniques are two common approaches to travel in consumer VR applications. In this paper, we present two within-subject studies that employ a prior dual-task methodology to evaluate and compare the cognitive loads, travel performances, and simulator sickness of three common target-based travel techniques and three common steering-based travel techniques. We also present visual meta-analyses comparing our results to prior results using the same dual-task methodology.

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Background/objectives: Advance care planning (ACP) has shown benefit in some, but not all, studies. It is important to understand the utility of ACP. We conducted a scoping review to identify promising interventions and outcomes.

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Objectives: To determine whether depression and anxiety are associated with advance care planning (ACP) engagement or values concerning future medical care.

Design: Cross-sectional.

Participants: English- and Spanish-speaking patients, aged 55 years and older, from a San Francisco, CA, county hospital.

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Objective: Mice genetically deficient in endothelial nitric oxide synthase (Nos3) have fasting hyperinsulinemia and hepatic insulin resistance, indicating the importance of Nos3 (nitric oxide synthase) in maintaining metabolic homeostasis. Although the current paradigm holds that these metabolic effects are derived specifically from the expression of Nos3 in the endothelium, it has been established that bone marrow-derived cells also express Nos3. The aim of this study was to investigate whether bone marrow-derived cell Nos3 is important in maintaining metabolic homeostasis.

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In-Home Supportive Services (IHSS) cares for millions of Medicaid-eligible older adults who are often homebound and socially isolated. Advance care planning (ACP) can be challenging for this population, and IHSS programs may play an important role. To explore the feasibility of an IHSS ACP program for frail older adults.

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Background: Advance care planning (ACP) engagement is low among vulnerable populations, including those with limited health literacy (LHL). Limited knowledge about ACP may be a modifiable mediator of the relationship between LHL and ACP. Our goal was to determine whether health literacy is associated with ACP knowledge.

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Background: Macrophage plasticity allows cells to adopt different phenotypes, a property with important implications in disorders such as cystic fibrosis (CF) and asthma.

Objective: We sought to examine the transcriptional and functional significance of macrophage repolarization from an M1 to an M2 phenotype and assess the role of a common human genetic disorder (CF) and a prototypical allergic disease (asthma) in this transformation.

Methods: Monocyte-derived macrophages were collected from healthy subjects and patients with CF and polarized to an M2 state by using IL-4, IL-10, glucocorticoids, apoptotic PMNs, or azithromycin.

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Patient activation-or knowledge, confidence, and skill managing overall health-is associated with improved health behaviors such as exercise; it is unknown whether it is associated with advance care planning (ACP). To determine whether patient activation is associated with ACP. This is a cross-sectional study.

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Objectives: To elicit decisions that diverse older adults and surrogates perceive as serious, difficult, or important and explore what helped them make those decisions.

Design: Focus groups (N=13) in which participants were asked to recall serious, difficult, or important medical decisions and what helped them make those decisions.

Setting: Clinics, support groups and senior centers.

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Background: Millions of older adults require Medicaid-funded home care, referred to as In-Home Supportive Services (IHSS). Many of these individuals experience serious illness, disability, and common symptoms such as pain and shortness of breath.

Objective: To explore whether and how to integrate symptom assessment into an IHSS program to identify and manage symptoms in diverse older adults who receive in-home care.

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Context: Documenting patients' advance care planning (ACP) wishes is essential to providing value-aligned care, as is having this documentation readily accessible. Little is known about ACP documentation practices in the electronic health record.

Objectives: The objective of this study was to describe ACP documentation practices and the accessibility of documented discussions in the electronic health record.

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Importance: Documentation rates of patients' medical wishes are often low. It is unknown whether easy-to-use, patient-facing advance care planning (ACP) interventions can overcome barriers to planning in busy primary care settings.

Objective: To compare the efficacy of an interactive, patient-centered ACP website (PREPARE) with an easy-to-read advance directive (AD) to increase planning documentation.

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Context: Despite increasing interest in advance care planning (ACP) and previous ACP descriptions, a consensus definition does not yet exist to guide clinical, research, and policy initiatives.

Objective: The aim of this study was to develop a consensus definition of ACP for adults.

Methods: We convened a Delphi panel of multidisciplinary, international ACP experts consisting of 52 clinicians, researchers, and policy leaders from four countries and a patient/surrogate advisory committee.

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Macrophages have important functional roles in regulating the timely promotion and resolution of inflammation. Although many of the intracellular signaling pathways involved in the proinflammatory responses of macrophages are well characterized, the components that regulate macrophage reparative properties are less well understood. We identified the MEK1/2 pathway as a key regulator of macrophage reparative properties.

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Several members of the matrix metalloproteinase (MMP) family control a range of immune processes, such as leukocyte influx and chemokine activity. Stromelysin-2 (MMP10) is expressed by macrophages in numerous tissues after injury; however, little is known of its function. In this study, we report that MMP10 is expressed by macrophages in human lungs from patients with cystic fibrosis and induced in mouse macrophages in response to Pseudomonas aeruginosa infection both in vivo and by isolated resident alveolar and bone marrow-derived macrophages (BMDM).

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Objective: For patients' preferences to be honored, emergency department (ED) physicians must be able to find and use advance care planning (ACP) information in the electronic medical record (EMR). ED physicians' experiences with ACP EMR documentation and their documentation needs are unknown.

Methods: We surveyed 70 ED physicians (81% response rate) from a tertiary and county ED.

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