Open Access Policy Deposits

Differential Use of Diagnostic Ultrasound in U.S. Emergency Departments by Time of Day

(2011)

Background: Survey data over the last several decades suggests that emergency department (ED) access to diagnostic ultrasound performed by the radiology department is unreliable, particularly outside of regular business hours.

Objective: To evaluate the association between the time of day of patient presentation and the use of diagnostic ultrasound services in United States (U.S.) EDs.

Methods: This was a cross-sectional study of ED patient visits using the National Hospital Ambulatory Medical Care Survey for the years 2003 to 2005. Our main outcome measure was the use of diagnostic ultrasound during the ED patient visit as abstracted from the medical record. We performed multivariate analyses to identify any association between ultrasound use and time of presentation for all patients, as well as for two subgroups who are more likely to need ultrasound as part of their routine workup: patients at risk of deep venous thrombosis, and patients at risk for ectopic pregnancy.

Results: During the three-year period, we analyzed 110,447 patient encounters, representing 39 million national visits. Of all ED visits, 2.6% received diagnostic ultrasound. Presenting to the ED “off hours” (defined as Monday through Friday 7pm to 7am and weekends) was associated with a lower rate of ultrasound use independent of potential confounders (odds ratio [OR] 0.73, 95% confidence interval [CI]: 0.65 - 0.82). Patients at increased risk of deep venous thrombosis who presented to the ED during “off hours” were also less likely to undergo diagnostic ultrasound (OR 0.34, 95% CI: 0.15 - 0.79). Similarly, patients at increased risk of ectopic pregnancy received fewer diagnostic ultrasounds during “off hours” (OR 0.56, 95% CI 0.35 - 0.91).

Conclusion: In U.S. EDs, ultrasound use was lower during “off hours,” even among patient populations where its use would be strongly indicated. [West J Emerg Med. 2011;12(1):90-95.]

Hypertension control and risk of age-associated dementia in people with HIV infection.

(2025)

OBJECTIVE: Hypertension is a major risk factor for dementia, but sustained blood pressure control is difficult to achieve. We evaluated whether inadequately controlled hypertension may contribute to excess dementia risk among people with HIV. DESIGN: A retrospective cohort study. METHODS: We studied demographically matched people with and without HIV between July 1, 2013, and December 31, 2021, who were at least 50 years old and had a hypertension diagnosis but no dementia diagnosis. Hypertension control was calculated using a disease management index (DMI), which captured degree and duration above the hypertension treatment goals of SBP less than 140 mmHg and DBP less than 90 mmHg. DMI values ranged from 0 to 100% (perfect control); hypertension was considered inadequately controlled if DMI was less than 80% (i.e., in control for <80% of the time). Annual, time-updated DMI was calculated for SBP and DBP. Associations of SPB and DPB control with incident dementia were evaluated using extended Cox regression models. RESULTS: The study included 3099 hypertensive people with HIV (mean age: 58.3 years, 90.2% men) and 66 016 people without HIV. Each year of inadequate SBP control was associated with greater dementia risk in both people with HIV (adjusted hazard ratio [aHR] = 1.26, 0.92-1.64) and people without HIV (aHR = 1.27 (1.21-1.33); P- interaction = 0.85). Similarly, inadequate DBP control was associated with greater dementia risk in both people with HIV (aHR = 1.43, 0.90-1.95) and people without HIV (aHR = 1.71, 1.50-1.93; P -interaction = 0.57). CONCLUSION: Findings suggest the association of inadequate hypertension control with greater dementia risk is similar by HIV status. Stronger associations of DBP control with dementia merit further investigation.

Postabortion contraceptive use among women in Nepal: results from a longitudinal cohort study.

(2024)

INTRODUCTION: Although the Government of Nepal has developed strategies to integrate contraceptive services with abortion care to better meet the contraceptive needs of women, data indicate that significant gaps in services remain. This paper assessed post-abortion contraceptive use, trends over 36 -months, and factors influencing usage. METHODS: Data from this paper came from an ongoing cohort study of 1831 women who sought an abortion from one of the sampled 22 government-approved health facilities across Nepal. Women were interviewed eight times over 36 months between April 2019 to Dec 2023. Bivariate and multivariate analysis were used to analyze the data. RESULTS: Results show that after abortion, 59% of women used modern contraception, with injection being the most prevalent method, followed by condoms, pills, implants, and IUD. The hazard model showed that discontinuation of modern contraception was significantly higher among women desiring additional children (aHR 0.62) and lower among literate (aHR - 0.15) and those with existing children (aHR - 0.30). Womens age, ethnicity, cohabitation with husband, households income and autonomy were not associated with continuation. CONCLUSION: After having an abortion, we found that just slightly more than half of women used modern methods of contraception; this percentage did not increase significantly over the course of three years.

Cover page of Barriers and facilitators of HIV partner status notification in low- and lower-middle-income countries: A mixed-methods systematic review.

Barriers and facilitators of HIV partner status notification in low- and lower-middle-income countries: A mixed-methods systematic review.

(2024)

BACKGROUND: The uptake of HIV partner status notification remains limited in low- and lower-middle-income countries. This mixed-methods systematic review aims to summarize the barriers and facilitators of HIV partner status notification in these settings. METHODS: We searched PubMed, Embase, CINAHL, PsychINFO, Scopus, and Web of Science from January 01, 2000, to August 31, 2023, for empirical qualitative and quantitative studies. Two independent reviewers completed the title, abstract, full-text screening, and data extraction. The risk of bias was assessed using a mixed-methods appraisal tool (MMAT), and the study findings were summarized narratively. RESULTS: Out of the 2094 studies identified, 59 relevant studies were included. Common barriers included fear of stigma and discrimination, violence, abandonment, breach of confidentiality and trust, low HIV-risk perception, and limited knowledge of HIV and HIV testing. Facilitators of HIV partner status notification were feelings of love and closeness in marital relationships, feelings of protecting self and partners, and HIV counseling services. CONCLUSION: Efforts to improve HIV partner status notification in low- and lower-middle-income countries should consider barriers and facilitators across all its components, including notification, testing, and linkage to treatment. In addition, HIV partner services must be adapted to the unique needs of key populations.

Skeletal Muscle Composition, Power, and Mitochondrial Energetics in Older Men and Women With Knee Osteoarthritis

(2024)

Objective

Our objective was to investigate the overall and sex-specific relationships between the presence and severity of knee osteoarthritis (KOA) and muscle composition, power, and energetics in older adults.

Methods

Male and female patients (n = 655, mean ± SD age 76.1 ± 4.9 years; 57% female) enrolled in the Study of Muscle, Mobility, and Aging completed standing knee radiographs and knee pain assessments. Participants were divided into three groups using Kellgren-Lawrence grade (KLG) of KOA severity (0-1, 2, or 3-4). Outcome measures included whole-body muscle mass, thigh fat-free muscle (FFM) volume and muscle fat infiltration (MFI), leg power, specific power (power normalized to muscle volume), and muscle mitochondrial energetics.

Results

Overall, the presence and severity of KOA is associated with greater MFI, lower leg power and specific power, and reduced oxidative phosphorylation (P trend < 0.036). Sex-specific analysis revealed reduced energetics only in female patients with KOA (P trend < 0.007) compared to female patients without KOA. In models adjusted for age, sex, race, nonsteroidal anti-inflammatory drug administration, site or technician, physical activity, height, and participants with abdominal adiposity with KLG 3 to 4 had greater MFI (mean 0.008%, 95% confidence interval [CI] 0.004%-0.011%) and lower leg power (mean -51.56 W, 95% CI -74.03 to -29.10 W) and specific power (mean -5.38 W/L, 95% CI -7.31 to -3.45 W/L) than those with KLG 0 to 1. No interactions were found between pain and KLG status. Among those with KOA, MFI and oxidative phosphorylation were associated with thigh FFM volume, leg power, and specific power.

Conclusion

Muscle health is associated with the presence and severity of KOA and differs by sex. Although muscle composition and power are lower in both male and female patients with KOA, regardless of pain status, mitochondrial energetics is reduced only in female patients.

Cover page of Dignified Resources and Coping Strategies During the COVID-19 Pandemic: a Qualitative Study of Racially and Economically Marginalized Communities.

Dignified Resources and Coping Strategies During the COVID-19 Pandemic: a Qualitative Study of Racially and Economically Marginalized Communities.

(2024)

INTRODUCTION: Amid the spread of the novel coronavirus (COVID-19), racially and economically marginalized communities experienced a disproportionate burden of disease and social consequences (e.g., unemployment, increased exposure). This study seeks to understand strategies that these communities employed to cope with unequal burdens of the pandemic. METHODS: We utilized qualitative data collected between 2020 and 2021 from a mobile mapping platform designed to facilitate real-time, geocoded data collection on individuals experiences and perceptions of their neighborhoods. Reports were iteratively coded by an academic researcher and community partner. We employed an inductive approach to analysis, which allowed findings to emerge organically without constraint of researcher hypotheses. RESULTS: A total of 19 respondents (14 under the age of 45, 16 non-White, 15 with less than half a year of emergency savings) provided 236 qualitative reports. Participants described innovative strategies for exchanging resources as a means of informally networking and building community, the importance of tailored programming (e.g., for specific racial/ethnic groups) in fostering belonging and comfort, and the importance of two specific dimensions of services-interactions with service providers and the quality of goods or services-in providing dignified care. DISCUSSION: Amidst exacerbated racial and economic disparities emerging from the COVID-19 pandemic, our study highlights the need for investment in mutual aid, the importance of tailored services and support, and promoting dignity in social services. As other macro-level social stressors become more prevalent as the pandemic continues, these findings can inform how we examine and address them.

Preferences of people living with HIV for features of tuberculosis preventive treatment regimens in Uganda: a discrete choice experiment

(2024)

Introduction

Tuberculosis (TB) preventive treatment (TPT) is recommended for people living with HIV (PLHIV) in high TB burden settings. While 6 months of daily isoniazid remains widely used, shorter regimens are now available. However, little is known about preferences of PLHIV for key features of TPT regimens.

Methods

From July to November 2022, we conducted a discrete choice experiment among adult PLHIV engaged in care at an urban HIV clinic in Kampala, Uganda. Participants chose between two hypothetical TPT regimens with five different features (pills per dose, frequency, duration, need for adjusted antiretroviral therapy [ART] dosage and side effects), organized across nine random choice tasks. We analysed preferences using hierarchical Bayesian estimation, latent class analysis and willingness-to-trade simulations.

Results

Of 400 PLHIV, 392 (median age 44, 72% female, 91% TPT-experienced) had high-quality choice task responses. Pills per dose was the most important attribute (relative importance 32.4%, 95% confidence interval [CI] 31.6-33.2), followed by frequency (20.5% [95% CI 19.7-21.3]), duration (19.5% [95% CI 18.6-20.5]) and need for ART dosage adjustment (18.2% [95% CI 17.2-19.2]). Latent class analysis identified three preference groups: one prioritized less frequent, weekly dosing (N = 222; 57%); another was averse to ART dosage adjustment (N = 107; 27%); and the last prioritized short regimens with fewer side effects (N = 63; 16%). All groups highly valued fewer pills per dose. Overall, participants were willing to accept a regimen of 2.8 months' additional duration [95% CI: 2.4-3.2] to reduce pills per dose from five to one, 3.6 [95% CI 2.4-4.8] months for weekly rather than daily dosing and 2.2 [95% CI 1.3-3.0] months to avoid ART dosage adjustment.

Conclusions

To align with preferences of PLHIV in Uganda, decision-makers should prioritize the development and implementation of TPT regimens with fewer pills, less frequent dosing and no need for ART dosage adjustment, rather than focus primarily on duration of treatment.

Spending on anticancer drugs among Medicare beneficiaries: Analyzing predictors of drug expenditures

(2024)

Objective

To evaluate the factors associated with Medicare spending on newly approved anticancer drugs in the US from 2012 through 2021.

Patient and methods

Using a cross-sectional analysis, we searched US FDA new oncology drug approvals (2012-2021). We analyzed clinical attributes and institutional factors influencing the annual cost of new anticancer drugs in the US. Annual treatment cost was calculated based on average spending per beneficiary from the Centers for Medicare and Medicaid Services, with product factors sourced from the FDA's annual New Drug Therapy Approval reports and drug package inserts at the time of approval.

Results

Over a ten-year period, 112 new anticancer drugs were approved, of which 97 met the study's criteria. A significant majority, 93 %, received expedited development designations from the FDA. At the time of approval, 40 % of these drugs had data on progression-free survival, and 19 % had data on overall survival; 29 % were first-in-class. The study found a significant relationship between the year of approval and factors associated with the size of the treatment population. No statistically significant relationship was found between the clinical value of a drug and its price.

Conclusions

Spending on anticancer drugs by Medicare are predominantly determined by reference pricing and the size of the anticipated treatment population, without an association with therapeutic value. The study advocates for reforms in reimbursement mechanisms for drugs lacking comparator arms and greater transparency for patients treated with these drugs.

Cover page of Association of cartilage T 1 ρ and T 2 relaxation time measurement with hip osteoarthritis progression: A 5-year longitudinal study using voxel-based relaxometry and Z-score normalization.

Association of cartilage T 1 ρ and T 2 relaxation time measurement with hip osteoarthritis progression: A 5-year longitudinal study using voxel-based relaxometry and Z-score normalization.

(2024)

OBJECTIVE: To study the longitudinal changes of cartilage T 1 ρ and T 2 relaxation time measurements in hip-OA patients. METHODS: A calibration study compared two scanner data, Scanner-1 (GE Discovery MR750 3.0T) with unilateral acquisition protocol and Scanner-2 (GE Signa Premier 3.0T) with bilateral acquisition protocol, using nine subjects(average age = 40.33 ± 13.53 years, 5 females), including one hip-OA subject. Quantified parameters from the Scanner-2 were adjusted using voxel-based relaxometry(VBR) and Z-score normalization to reduce the inter-scanner variability. Eighteen hip-OA Subjects (age = 53.11 ± 14.96 years, 12 females) were recruited to the longitudinal variability study from 2016, comprising five assessments at 1-year intervals. Baseline to 3rd-year data used unilateral acquisition with Scanner-1, while 4th-year data used bilateral acquisition with Scanner-2. A linear mixed-effects model(LME) assessed trajectory analyses, with acquisition year, age, sex, body mass index(BMI), and Kellgren-Lawrence(KL) score as predictor variables and cartilage mean T 1 ρ and T 2 values as outcomes. RESULTS: VBR analysis after Z-score normalization showed that only a few of the whole cartilage voxels had significant differences in T 1 ρ ( femur-2.36 % and acetabular-3.23 %) and T 2 (femur-2.30 % and acetabular-2.94 %) values between the scanners. The LME analysis showed that the BMI predictor variable was significantly correlated with the femur T 1 ρ (p < 0.0001) and T 2 (p < 0.0001) and acetabular T 1 ρ (p < 0.0001) and T 2 (p < 0.0001) cartilage region. CONCLUSION: The calibration study demonstrated the effectiveness of VBR and Z-score normalization in reducing inter-scanner variability. The longitudinal study revealed a significant correlation between T 1 ρ and T 2 values of the cartilage and BMI; also the T 1 ρ and T 2 values increased over time in some of the cartilage subregions.

Cover page of Preferences of people living with HIV for features of tuberculosis preventive treatment regimens in Uganda: a discrete choice experiment

Preferences of people living with HIV for features of tuberculosis preventive treatment regimens in Uganda: a discrete choice experiment

(2024)

Introduction

Tuberculosis (TB) preventive treatment (TPT) is recommended for people living with HIV (PLHIV) in high TB burden settings. While 6 months of daily isoniazid remains widely used, shorter regimens are now available. However, little is known about preferences of PLHIV for key features of TPT regimens.

Methods

From July to November 2022, we conducted a discrete choice experiment among adult PLHIV engaged in care at an urban HIV clinic in Kampala, Uganda. Participants chose between two hypothetical TPT regimens with five different features (pills per dose, frequency, duration, need for adjusted antiretroviral therapy [ART] dosage and side effects), organized across nine random choice tasks. We analysed preferences using hierarchical Bayesian estimation, latent class analysis and willingness-to-trade simulations.

Results

Of 400 PLHIV, 392 (median age 44, 72% female, 91% TPT-experienced) had high-quality choice task responses. Pills per dose was the most important attribute (relative importance 32.4%, 95% confidence interval [CI] 31.6-33.2), followed by frequency (20.5% [95% CI 19.7-21.3]), duration (19.5% [95% CI 18.6-20.5]) and need for ART dosage adjustment (18.2% [95% CI 17.2-19.2]). Latent class analysis identified three preference groups: one prioritized less frequent, weekly dosing (N = 222; 57%); another was averse to ART dosage adjustment (N = 107; 27%); and the last prioritized short regimens with fewer side effects (N = 63; 16%). All groups highly valued fewer pills per dose. Overall, participants were willing to accept a regimen of 2.8 months' additional duration [95% CI: 2.4-3.2] to reduce pills per dose from five to one, 3.6 [95% CI 2.4-4.8] months for weekly rather than daily dosing and 2.2 [95% CI 1.3-3.0] months to avoid ART dosage adjustment.

Conclusions

To align with preferences of PLHIV in Uganda, decision-makers should prioritize the development and implementation of TPT regimens with fewer pills, less frequent dosing and no need for ART dosage adjustment, rather than focus primarily on duration of treatment.

Department of Epidemiology and Biostatistics