Eye Examination Recency among African American Older Adults with Chronic Medical Conditions

Detection of TTR Amyloid in the Conjunctiva Using a Novel Fluorescent Ocular Tracer

Background

Transthyretin amyloidosis (ATTR) is a significant cause of cardiomyopathy and other morbidities in the elderly and Black Americans. ATTR can be treated with new disease-modifying therapies, but large shortfalls exist in its diagnosis. The objective of this study was to test whether TTR amyloid can be detected and imaged in the conjunctiva using a novel small-molecule fluorescent ocular tracer, with the implication that ATTR might be diagnosable by a simple eye examination.

Methods

Three approaches were used in this study. First, AMDX-9101 was incubated with in vitro aggregated TTR protein, and changes in its excitation and emission spectra were quantified. Second, a cadaver eye from a patient with familial amyloid polyneuropathy type II TTR mutation and a vitrectomy sample from an hATTR patient were incubated with AMDX-9101 and counterstained with Congo Red and antibodies to TTR to determine whether AMDX-9101 labels disease-related TTR amyloid deposits in human conjunctiva and eye. Last, imaging of in vitro aggregated TTR amyloid labeled with AMDX-9101 was tested in a porcine ex vivo model, using a widely available clinical ophthalmic imaging device.

Results

AMDX-9101 hyper-fluoresced in the presence of TTR amyloid in vitro, labeled TTR amyloid deposits in postmortem human conjunctiva and other ocular tissues and could be detected under the conjunctiva of a porcine eye using commercially available ophthalmic imaging equipment.

Conclusions

AMDX-9101 enabled detection of TTR amyloid in the conjunctiva, and the fluorescent binding signal can be visualized using commercially available ophthalmic imaging equipment.

Translational Relevance

AMDX-9101 detection of TTR amyloid may provide a potential new and noninvasive test for ATTR that could lead to earlier ATTR diagnosis, as well as facilitate development of new therapeutics.

Examining colorectal cancer screening uptake and health provider recommendations among underserved middle aged and older African Americans

Background: The purpose of this study is to determine whether underserved middle-aged and older African Americans are receiving a colorectal cancer (CRC) screening test (sigmoidoscopy or colonoscopy) and if recommended by their provider. Additionally, we examined correlates of both provider recommendation and uptake of CRC screening. Methods: Seven hundred forty African American individuals, aged 55 and older, participated in this local community cross-sectional survey. We used a multivariate technique of logistic regression. Results: One out of three participants reported that they never received a sigmoidoscopy or colonoscopy for CRC screening. More than 31% indicted that their providers never suggested CRC testing. However, participants who indicated that their providers recommended sigmoidoscopy/colonoscopy were almost 49 times (odds ratio [OR]: 48.9, 95% confidence interval [CI]: 29.5-81.2) more likely to obtain it compared to their counterparts who were not advised to have these procedures. Our data suggest that African American men were significantly less likely than women to receive recommendations from their providers (OR: 0.70, 95% CI: 0.50-0.91). Furthermore, controlling for other variables, the following factors: 1) living arrangement (OR: 1.44, 95% CI: 1.02-2.04), 2) health maintenance organization (HMO) membership (OR: 1.84, 95% CI: 1.28-2.67), 3) number of providers (OR: 1.15, 95% CI: 1.01-1.32), 4) satisfaction with access to and quality of care (OR: 1.24, 95% CI: 1.03-1.51), 5) depressive symptoms (OR: 0.92, 95% CI: 0.86-0.98), and 6) gastrointestinal conditions (OR: 1.73, 95% CI: 1.16-2.58) were associated with obtaining a sigmoidoscopy or colonoscopy test. Conclusion: Our findings suggest that the absence of a provider recommendation is the primary barrier preventing underserved older African Americans from obtaining CRC screening. In addition, our data revealed significant association between obtaining CRC screening and some of the predisposing characteristics of participants, satisfaction with access to and quality of care, and physical and mental health. These findings are consistent with this notion that disparities in health care for African Americans can be traced back to four primary factors: patients, healthcare providers, the healthcare system, and society as a whole, and emphasize the need for establishing theory-driven, culturally-sensitive, and cost-effective CRC screening interventions that recognize and address the constraints to cancer screening experienced by this segment of population.

Improving Access to Eye Care: A Systematic Review of the Literature

PURPOSE

The goals were to develop a working and inclusive definition of access to eye care, identify gaps in the current system that preclude access, and highlight recommendations that have been identified in prior studies. This manuscript serves as a narrative summary of the literature.

CLINICAL RELEVANCE

Health care disparities continue to plague the nation's well-being, and eye care is no exception. Inequities in eye care negatively affect disease processes (i.e., glaucoma, cataracts, diabetic retinopathy), interventions (surgical treatment, prescription of glasses, referrals), and populations (gender, race and ethnicity, geography, age).

METHODS

A systematic review of the existing literature included all study designs, editorials, and opinion pieces and initially yielded nearly 2500 reports. To be included in full-text review, an article had to be US-based, be written in English, and address 1 or more of the key terms "barriers and facilitators to health care," "access," and "disparities in general and sub-specialty eye care." Both patient and health care professional perspectives were included. One hundred ninety-six reports met the inclusion criteria.

RESULTS

Four key themes regarding access to eye care from both patient and eye care professional perspectives emerged in the literature: (1) barriers and facilitators to access, (2) utilization, (3) compliance and adherence, and (4) recommendations to improve access. Common barriers and facilitators included many factors identified as social determinants of health (i.e., transportation, insurance, language, education). Utilization of eye care was largely attributable to having coverage for eye care, recommendations from primary care professionals, and improved health status. Geographic proximity, age, and lack of transportation surfaced as factors for compliance and adherence. There were a variety of recommendations to improve access to eye care, including improving presence in community health clinics, reimbursement for physicians, and funding of community-based programs such as DRIVE and REACH.

CONCLUSIONS

The eye care profession has abundant evidence of the disparities that continue to affect marginalized communities. Improving community-based programs and clinics, addressing social determinants of health, and acknowledging the effects of discrimination and bias on eye care serve as ways to improve equity in this field.