Faculty Bibliography

We address an ethical challenge in climate change adaptation and global health research. The challenge stems from two pairs of intuitions about justice and responsibility in climate change and health. One pair assigns responsibility for adaptation research to high-income countries given their historical emissions, disproportionate share of resources and capacity to intervene. The other pair assigns responsibility to low- and middle-income countries given their agency, right to self-determination, local authority and legitimacy, and disproportionate burden of climate and health risks. The intuitions create conflicting views: obligation and assistance pull in one direction, and agency and authority pull in another. To resolve the tension, we distinguish two forms of responsibility: (i) adaptation-enabling responsibilities; and (ii) adaptation-enacting responsibilities. The resulting division of labour reflects different forms of justice and aligns with the principle of subsidiarity's core elements, namely: non-abandonment, non-absorption, and cooperation and coordination. We thus propose a framework that ascribes adaptation-enabling responsibilities to high-income countries, including adaptation financing, capacity-building and other forms of support; and adaptation-enacting responsibilities to low- and middle-income countries, including priority-setting in local adaptation research, and creation and implementation of their adaptation plans and policies. Our framework also suggests a third form of responsibility: shared adaptation responsibilities, which are jointly assigned to high-income countries, low- and middle-income countries and agents at multiple levels within them. We conclude that genuine collaboration in adaptation research, where high-income countries enable without dominating and low- and middle-income countries act without being abandoned, will be essential for just and effective adaptation to climate change.

Adult spinal deformity patients undergoing total hip arthroplasty experience higher hip dislocation rates than those with normal spinal alignment. The traditional Lewinnek safe zone does not account for spinopelvic variation such as pelvic retroversion. To address this, three patient-specific normative zones for acetabular anteversion were defined. A multicenter retrospective analysis of 146 adult spinal deformity patients and 47 asymptomatic controls was performed using three-dimensional biplanar radiograph reconstructions to measure spinopelvic alignment and acetabular orientation. Normative Zone 1, for patients not undergoing spinal realignment, was delineated by the 95% confidence interval limits: minimum anteversion = 0.3182 × pelvic tilt +2.947 and maximum anteversion = 0.3317 × pelvic tilt +25.823. Normative Zone 2, for patients following spinal realignment, was based on pelvic incidence: minimum anteversion = 0.0682 × pelvic incidence +9.7749 and maximum anteversion = 0.0698 × pelvic incidence +21.5218. Normative Zone 3, intended for cases with uncertain spinal correction plans, was defined as the intersection of Zones 1 and 2, yielding a narrower target anteversion range. These zones enable patient-specific cup placement that accounts for existing or planned spinal alignment, with the potential to reduce dislocation risk. Clinical Significance: This study provides acetabular cup orientation tailored to each patient's spinopelvic alignment and surgical plan, potentially reducing dislocation rates in spinal malalignment patients.

Clinical evaluations of large language models (LLMs) have rapidly expanded since 2022, yet their evidence base remains opaque. The overwhelming volume of studies creates challenges for manual curation and review. However, LLMs themselves offer the scalability and capability to evaluate the ever-growing evidence base. This LLM-assisted review identified 4,609 peer-reviewed studies in clinical medicine between January 2022 and September 2025, equating to roughly 3.2 papers per day. Only 1,048 studies used real-world patient data and of these only 19 were prospective randomized trials; most addressed simulated scenarios (n = 1,857) or exam-style tasks (n = 1,704). ChatGPT and related OpenAI models constitute 65.7% of evaluated models, with Gemini/Bard a distant second constituting 13.1% of evaluated models. Patient-facing communication and education comprised 17% of tasks, followed by knowledge retrieval, and education and assessment simulation. Across 1,046 head-to-head comparisons, LLMs outperformed humans in 33% of comparisons, with a strong dependency on task realism and level of training. At least 25% of studies had sample sizes less than 30. Despite the growth of LLMs in medicine, rigorous, patient-centered evidence remains scarce, underscoring the need for larger prospective trials before clinical adoption.

BACKGROUND:Motivational text messages can encourage increased physical activity. This study aimed to validate motivational text messages among older adults and care partners and to assess differences in perceived motivational value between the two groups. METHODS:We designed nine motivational text messages to capture nine distinct physical activity scenarios. For this cross-sectional observational study, we enrolled 14 content experts, 310 older adults, and 305 care partners. Content experts assessed the relevance, while the older adults and care partners assessed the perceived motivational value of each text message on a 5-point Likert scale. We computed the item content validity index and assessed differences in perceived motivational value among older adults and care partners using quantile regression while adjusting for sociodemographic and health characteristics. RESULTS:The item content validity index ranged from 0.86 to 1.00. The median (interquartile range) perceived motivational value for each text message was 4.0 (3.0-5.0), and there were no statistically significant differences in reported motivational values between older adults and care partners. CONCLUSION/CONCLUSIONS:We present nine content-validated text messages with high motivational value for older adults and care partners that can be integrated into technology-based intervention studies and may improve physical activity behavior in both groups.

INTRODUCTION/BACKGROUND:Postoperative urinary retention (POUR) is a common complication following inguinal hernia repair (IHR), and it can be influenced by the type of neuromuscular blockade reversal medication used, especially acetylcholinesterase inhibitors. Among the available options for neuromuscular blockade reversal, Sugammadex has gained significant popularity due to its effectiveness, speed, and safety profile. Additionally, some studies suggest that it prevents POUR compared to acetylcholinesterase inhibitors. We aimed to perform a systematic review and meta-analysis to assess the POUR rates with the use of Sugammadex after IHR. METHODS:PubMed, EMBASE, Cochrane, LILACS, and Web of Science databases were systematically searched without date or language restrictions from inception to October 2024. The databases were searched for studies comparing Sugammadex with other medications for neuromuscular blockade reversal after IHR. The primary outcome was POUR. RESULTS:< .001), with a relative risk reduction of 89%. CONCLUSION/CONCLUSIONS:Sugammadex is associated with a significantly lower risk of POUR following IHR when compared to other medications for neuromuscular blockade reversal following IHR. Despite its higher cost and decreased availability in some centers, the use of Sugammadex should be strongly considered as the preferred option to prevent POUR and minimize the need for hospital readmissions.

Difference-in-differences (DID) is popular because it can allow for unmeasured confounding when the key assumption of parallel trends holds. However, there exists little guidance on how to decide a priori whether this assumption is reasonable. We attempt to develop such guidance by considering the relationship between a causal diagram and the parallel trends assumption. This is challenging because parallel trends is scale-dependent and causal diagrams are generally scale-independent. We develop conditions under which, given a nonparametric causal diagram, one can reject or fail to reject parallel trends. In particular, we adopt a linear faithfulness assumption, which states that all graphically connected variables are correlated, and which is often reasonable in practice. We show that parallel trends can be rejected if either (i) the treatment is affected by pre-treatment outcomes, or (ii) there exist unmeasured confounders for the effect of treatment on pre-treatment outcomes that are not confounders for the post-treatment outcome, or vice versa. We also argue that parallel trends should be strongly questioned if (iii) the pre-treatment outcomes causally affect the post-treatment outcomes, since there exist reasonable semiparametric models in which such an effect violates parallel trends. When (i-iii) are absent, a necessary and sufficient condition for parallel trends is that the association between unmeasured confounders and potential outcomes is constant on an additive scale, pre- and post-treatment. We discuss our approach in the context of the effect of Medicaid expansion under the US Affordable Care Act on health insurance coverage rates.

OBJECTIVES/OBJECTIVE:Silicosis is one of the most common forms of pneumoconiosis worldwide. In Rwanda, there is a lack of data on the silicosis burden and occupational risk among underground miners. METHODS:We conducted a cross-sectional study among all miners from eight cassiterite (tin ore) mining sites in Kayonza district, eastern Rwanda. Questionnaire data and chest radiography were collected at Rwinkwavu District Hospital. Two radiologists reviewed all the chest radiographs using International Labour Organization (ILO) criteria, with a third radiologist reviewing films with ILO rating discrepancies. Logistic regression was performed to investigate risk factors associated with radiographic silicosis. RESULTS:In total, 1021 mine workers were included in the primary outcome (risk) analysis. The median age was 32 years (IQR 26-40), and 948 participants (93%) were male. Of all participants, 94 (9%) were diagnosed with silicosis in the primary analysis. Increased odds of silicosis were associated with working in a blasting station (adjusted OR (aOR) 3.30; 95% CI 1.68 to 6.45), excavation station (aOR 2.77; 95% CI 1.09 to 7.04), drilling station (aOR 2.51; 95% CI 1.34 to 4.70), exposure to tobacco (aOR 1.92; 95% CI 1.14 to 3.24) and increased time of working in mining (aOR 1.05 per year spent in mining; 95% CI 1.01 to 1.09). CONCLUSIONS:High-risk mining tasks, tobacco use and duration of mining employment were significantly associated with increased risk of having a silicosis diagnosis. Our results indicate that screening and preliminary occupational risk analysis in a rural mining cohort is technically feasible.

BACKGROUND:Glioblastoma intramedullary spinal cord metastasis (GISCM) is a rare sequela of high-grade astrocytoma and glioblastoma multiforme (GBM). Discrete intramedullary spinal cord metastases are less common than spinal leptomeningeal spread and may follow a more indolent course. Once identified as GISCM, palliative maximal safe resection of the tumor may be considered to alleviate neurological symptoms. Reports describing the surgical management of these rare lesions, including the use of emerging technologies that may aid in maximal safe resection, are sparse. A further understanding is also required regarding the course of disease and factors contributing to mortality in GISCM. METHODS:We reviewed the intraoperative management and clinical course of three patients treated for GISCM at our institution between 2015 and 2024. We additionally conducted a PRISMA-guided systematic literature review of PubMed Central, MEDLINE, and Bookshelf databases through May 26th, 2025, including original patient reports of GISCM from cranial astrocytoma or GBM. The disease course, management strategies, and causes of mortality in previously reported cases were analyzed. RESULTS:Our institutional cohort had a mean time to spinal metastasis of 26.2 months from diagnosis of cranial disease (range 17.5-40.5 months), with a mean survival of 9.2 months following maximal safe resection of extramedullary components (range 7-12 months). In two cases, intraoperative Stimulated Raman Histology (SRH) was employed to facilitate the rapid identification of metastatic GBM, thereby influencing surgical strategy. In one case, 5-aminolevulinic acid (5-ALA) was used to differentiate between tumor and spinal cord parenchyma, facilitating maximal safe debulking without neurological injury. Literature review identified 38 prior reported cases of GISCM, with a median time to spinal diagnosis of 11.0 months and a median survival of 3.5 months thereafter. The cause of death in the review cohort often involved multiple factors, and when analyzed for contributing factors to death, 38.7% involved cranial progression, 38.7% involved progression of spinal disease, and 29.0% involved medical complications. Gait ataxia at presentation was associated with shorter survival in review patients, potentially reflecting advanced disease with extramedullary cord compression. CONCLUSION/CONCLUSIONS:GISCM represents an entity distinct from leptomeningeal disease and may be managed in conjunction with recurrent cranial disease. Surgical debulking is a technically feasible strategy that can be safely facilitated using tools employed in the management of intracranial GBM, facilitating maximal safe resection without compromising survival.

Improving long-term protective immunity elicited by prime-boost vaccinations requires a deeper understanding of the immunologic outcomes of different vaccine platforms. Given the variety of platforms used to develop vaccines against SARS-CoV-2, we reasoned that SARS-CoV-2 offered an opportunity to compare vaccine platforms in humans. We used flow cytometry and single-cell transcriptomics to explore the B cell response to different homologous and heterologous vaccine regimens. We found that an adenovirus vector prime followed by a messenger RNA (mRNA) vaccine boost showed the greatest short-term B cell expansion and preferentially elicited an activated atypical B cell subset that was associated with antibody binding titers against spike protein. In contrast, an mRNA primary series followed by homologous boost induced a different activated B cell subset with more proliferative potential and high frequencies of a long-lived resting memory subset. Moreover, immunoglobulin A (IgA)-expressing memory B cells had more somatic hypermutations than the predominant IgG-expressing B cell population. This heterogeneity in vaccine-elicited B cell responses underscores the potential of tailoring vaccine regimens that combine different platforms to achieve potent and durable protection against infectious diseases.