Multi-Institutional Phase II Trial Using Dose Escalated Five Fraction Stereotactic Partial Breast Irradiation (S-PBI) with GammaPodTM for Early-Stage Breast Cancer

PURPOSE/OBJECTIVE(S)

We report on our early experience of a multi-institutional phase II study of dose escalated five fraction stereotactic partial breast irradiation (S-PBI) for early-stage breast cancer after partial mastectomy using the GammaPodTM stereotactic radiation system.

MATERIALS/METHODS

Patient eligibility included DCIS or invasive epithelial histologies, AJCC clinical stage 0, I, or II with tumor size < 3 cm, and negative margins. Prior safety of Phase I dose escalation has been reported. Dose was 40 Gy delivered in 5 fractions to the CTV, and minimum dose 30 Gy in 5 fractions to the PTV. CTV margin was 1 cm and PTV margin 3 mm. For PTV cavities larger than 100cc, dose was reduced to 35Gy in 5 fractions to the CTV and 30 Gy in 5 fractions to the PTV. Primary endpoint of the study is to determine the 3-year patient global cosmesis score (4-point scale excellent, good, fair, or poor) and adverse cosmesis using a dose escalated approach with smaller PTV margins than conventional methods. Both patients and physicians completed baseline and subsequent cosmesis outcome questionnaires. Treatment related toxicity was graded using the NCI version 4.0 and RTOG/EORTC late radiation scale.

RESULTS

From 3/2019-10/2021, 74 patients were treated respectively. Of these, 38 were treated to 40Gy and 36 were treated to 35 Gy. Median follow up (f/u) was 24 months (mo), range (r) 3-39mo. Median age was 63 years (r 43-77). Histology included 28 DCIS, and 46 invasive carcinomas. 45/46 invasive tumors were ER+. 60/74 (81%) patients received endocrine therapy, and 7/74 patient received chemotherapy. There were 221 acute grade 1 toxicities, and 28 Grade 2 toxicities. No grade 3 or higher acute toxicities were reported (< 90 days). The most common Grade 2 toxicities were radiation dermatitis (10), breast pain (8), blister (4), skin infection (2), nipple discharge (2), and fatigue (2). In the late period, there were 54 Grade 1 late toxicities, 4 Grade 2 late toxicities, and no Grade 3 or higher late toxicities. Grade 2 toxicities included fibrosis (2), and pain (2). Two patients developed grade 1 asymptomatic nonpalpable fat necrosis both diagnosed at 12 months after radiation treatments. The most common grade 1 late toxicities were breast pain (14), hyperpigmentation (8), fibrosis (10), and fatigue (5). Physicians scored cosmesis excellent or good 70/73 (95.8%), 58/60 (96.7%), 36/36 (100%),17/17(100%) respectively at baseline, 12 months, 24 months, and 36months post SBRT, while patients scored the same periods 62/71 (83.7%), 53/59 (89.8%), 33/36 (91.6%), 17/18 (94.4%). There have been no reports of disease recurrences.

CONCLUSION

Results at 24-month median follow-up, of our dose escalated stereotactic partial breast 5 fraction regimen, has low acute and late toxicity, while maintaining high proportion of excellent/good cosmetic outcomes. Continued analysis of all cohorts is in progress.

CLINICAL TRIALS

gov identifier is NCT03581136.

Financial Toxicity and Patient Experience Outcomes on a Multi-Institutional Phase I Single Fraction Stereotactic Partial Breast Irradiation Protocol for Early-Stage Breast Cancer

PURPOSE/OBJECTIVE(S)

Given the demonstrated financial toxicity (FT) of radiation treatment on breast cancer patients shown in both conventional and our recent 5 fraction stereotactic APBI (S-PBI) study, we assessed the FT, as well as patient-reported utility, quality-of-life and patient experience measures, on patients treated in our phase I single fraction S-PBI trial.

MATERIALS/METHODS

A phase I single fraction dose escalation trial of S-PBI for early-stage breast cancer was conducted. Women with in-situ or stage I-II (AJCC 6) invasive breast cancer following breast conserving surgery were treated with S-PBI in 1 fraction to a total dose of 22.5, 26.5 or 30 Gy (Clinical trials.gov ID NCT02685332). At one month follow-up, patients were asked to complete our novel "Patient Perspective Cost and Convenience of Care Questionnaire". Patients also completed the EQ-5D-5L, including the visual analogue scale of overall health (VAS), at enrollment, 6, 12-, 24-, 36-, and 48-month follow-up.

RESULTS

Of 29 patients enrolled and treated, questionnaire data was available for all patients. Our trial encompassed a wide range of annual household incomes, education, and employment status. Overall, 44.8% (n = 13/29) of patients reported that radiation treatment presented a financial burden. Interestingly, no demographic information, such as patient race, marital status, education, household income, or employment during treatment predicted perceived FT. Patients reporting FT trended towards younger age (median 64 vs 70.5) and having a cancer related co-pay similar to our 5 fraction S-PBI FT trial; however, due to the small size of this study, this did not reach significance (p = 0.24 and 0.10, respectively). VAS and utility scores were calculated per the EQ-5D-5L and remained unchanged from baseline through 4-year follow-up. Likewise, there was no difference in the utility or VAS between patients who reported FT and those who did not. Interestingly, while patient reported cosmesis was similar for all patients at enrollment, patients who reported FT noted significantly worse cosmesis scores (fair/poor vs good/excellent) at 6 month and 2-year follow-ups (p = 0.01 and 0.04, respectively). Finally, patients were surveyed on treatment related disruption to their daily activities and enjoyment of life. The median values were 0 (scale 0-10, with 0 being no disruption) regardless of perceived FT. Patients were also uniformly satisfied with treatment time with a median score of 10 (scale 0-10, 10 being most satisfied).

CONCLUSION

Here, we show that despite using SPBI in a single fraction, nearly half of the patients treated still reported FT of treatment. Importantly, single fraction S-PBI has no negative impact on patient VAS or utility scores, and all patients were uniformly satisfied with treatment time without significant disruption to their life.

Vibration-Driven Self-Doping of Dangling-Bond Wires on Si(553)-Au Surfaces

Density-functional theory is used to explore the Si(553)-Au surface dynamics. Our study (i) reveals a complex two-stage order-disorder phase transition where with rising temperature first the ×3 order along the Si step edges and, subsequently, the ×2 order of the Au chains is lost, (ii) identifies the transient modification of the electron chemical potential during soft Au chain vibrations as instrumental for disorder at the step edge, and (iii) shows that the transition leads to a self-doping of the Si dangling-bond wire at the step edge. The calculations are corroborated by Raman measurements of surface phonon modes and explain previous electron diffraction, scanning tunneling microscopy, and surface transport data.

Oxygen and potassium vacancies in KTP calculated from first principles

The atomic geometry and energetics of oxygen and potassium vacancies in potassium titanyl phosphate (KTP) as well as their electronic and optical properties are studied within density-functional theory in dependence of their charge state. Oxygen vacancies formed between Ti and P are characterized by a negative-U behavior. Their neutral charge state is favored for Fermi levels near the conduction band and gives rise to a defect level in the band gap, which leads to an additional optical absorption peak. In contrast, the two-fold positive charge state, stable for low and intermediate values of the Fermi level, modifies the KTP optical response only slightly. Oxygen vacancies formed between two Ti atoms are two-fold positively charged, while potassium vacancies are negatively charged irrespective of the Fermi level position. In both these cases, the KTP optical response is essentially not affected.

Older and Younger African Americans' Story Schemas and Experiences of Living with HIV/AIDS

This paper reports findings from a study that compared older (n = 21, ≥ age 50) and younger (n = 96, ≤ age 49) African Americans' stories (N = 117) of living with HIV/AIDS to determine how they make sense of the experience. The purpose was to: (1) identify and describe the cultural models African Americans use to inform their stories of living with HIV/AIDS, and (2) to compare older and younger adults' HIV stories. To characterize the cultural models engaged in the telling of these HIV stories, we conducted schema analysis. Analyses documented six diverse schemas, ranging from "Stages of Grief", "12 Steps", "Wake Up Call", "Continuity of Life", to "Angry and Fearful", "Shocked and Amazed". Comparison conducted by age group showed older adults more frequently expressed their story of living with HIV as "Stages of Grief" and "Continuity of Life", whereas younger adults expressed their stories as "12 Steps" and "Wake Up Call". Findings contribute by documenting African American stories of living with HIV/AIDS, important heterogeneity in cultural schemas for experiences of living with HIV and differences by age group. These findings may help by identifying the cultural resources as well as challenges experienced with aging while living with HIV/AIDS for African Americans.

Adolescent friendships predict later resilient functioning across psychosocial domains in a healthy community cohort

BACKGROUND

Adolescence is a key time period for the emergence of psychosocial and mental health difficulties. To promote adolescent adaptive ('resilient') psychosocial functioning (PSF), appropriate conceptualisation and quantification of such functioning and its predictors is a crucial first step. Here, we quantify resilient functioning as the degree to which an individual functions better or worse than expected given their self-reported childhood family experiences, and relate this to adolescent family and friendship support.

METHOD

We used Principal Component and regression analyses to investigate the relationship between childhood family experiences and PSF (psychiatric symptomatology, personality traits and mental wellbeing) in healthy adolescents (the Neuroscience in Psychiatry Network; N = 2389; ages 14-24). Residuals from the relation between childhood family experiences and PSF reflect resilient functioning; the degree to which an individual is functioning better, or worse, than expected given their childhood family experiences. Next, we relate family and friendship support with resilient functioning both cross-sectionally and 1 year later.

RESULTS

Friendship and family support were positive predictors of immediate resilient PSF, with friendship support being the strongest predictor. However, whereas friendship support was a significant positive predictor of later resilient functioning, family support had a negative relationship with later resilient PSF.

CONCLUSIONS

We show that friendship support, but not family support, is an important positive predictor of both immediate and later resilient PSF in adolescence and early adulthood. Interventions that promote the skills needed to acquire and sustain adolescent friendships may be crucial in increasing adolescent resilient PSF.

Environmental Factors and Their Role in Community Integration after Spinal Cord Injury

Background. The International Classification of Functioning, Disability and Health (ICF) model presents an opportunity to better understand previously neglected longterm social outcomes after traumatic spinal cord injury (SCI), especially the experience of participation. Purpose. The study explored the relationship between perceived environmental barriers and perceived community integration (a participation proxy) in a sample of adults with traumatic SCI. Methods. The study interviewed African American and White women and men (n=136) who had lived with SCI for an average of 11.5 years. Results. Participants reported environmental barriers at twice the level indicated by previous studies; the natural environment and the policies of government were the most problematic. Levels of community integration were also high. Data suggest a significant relationship (p<.01) between perceived environmental barriers and community integration for adults with SCI, providing support for the ICF model. Implications. Improved measures and more sophisticated concepts and theories are needed to explicate the relationship between environmental factors and participation concepts in the ICF. With respect to practice, occupational therapists need to be aware that removal of environmental barriers is only a first step in the more complex effort to facilitate optimal community integration after SCI.

Do risk perceptions explain sex differences in community integration and participation after Spinal Cord Injury?

OBJECTIVE

To describe how men and women with spinal cord injury (SCI) rate the risks posed by a set of everyday activities measured using the Risk Inventory for persons with Spinal Cord Injury (RISCI), and to examine whether sex differences are related to community integration and participation.

DESIGN

Cohort study.

SETTING

Metropolitan Detroit.

PARTICIPANTS

One hundred and forty community-dwelling white and African-American men and women with SCI.

OUTCOME MEASURES

RISCI scores, community integration, and level of and satisfaction with community participation.

RESULTS

Study participants were just over age 40 years, and had been living with SCI for 10.8 years. One-third were women and 40% were African-American. Results showed women with SCI had higher RISCI scores (perceived more dangers) on every item on the RISCI Scale (P < 0.001). The items perceived to hold greatest risk were revealing personal information to others, going on a blind date, and going for a roll ("walk") alone after dark. Women with higher RISCI scores reported lower community integration (P < 0.05) and lower levels of and lower satisfaction with community participation (P < 0.01). For men, however, RISCI scores were mainly unrelated (except for community integration) to participation measures.

CONCLUSION

More research is needed to determine whether the levels of risk perceived by women are warranted and whether a sense of vulnerability for women with SCI is unnecessarily limiting their chances at "a good life" after injury.

Community engagement: an essential component of well-being in older African-American adults

Active engagement in life is a critical factor for successful aging. Research indicates that community engagement is strongly associated with health and well-being in late life. However, less is understood regarding the influence of neighborhood conditions on health and well-being, particularly in older African-American adults. The current study describes a convenience sample of older African Americans (N = 501, mean age = 70.7 [range 55-95] years) living in Detroit. The specific goal is to examine the relationships between their perceptions of neighborhood conditions, level of community engagement, and their health and well-being. Survey findings reveal a sample of highly engaged older African Americans in reasonable health who perceive their neighborhoods favorably. Regression analysis results indicate that community engagement is closely associated with both neighborhood perceptions and well-being in this sample. We propose that community engagement or "participation" mediates the relationship between neighborhood conditions and well-being for older African Americans living in Detroit.

Falls efficacy and self-rated health in older African American adults

Fear of falling and mobility restrictions have a significant negative impact on the quality of life of older adults. Because older African American adults are at increased risk for various modifiable health problems, understanding potential constraints on their overall health and mobility is critical in this population. The current study investigated this issue by analyzing a dataset of 449 older African American adults (mean age=72.3 years) living in Detroit. We characterized and investigated the relationships among the following falls- and health-related variables: previous falls, falls efficacy, mobility, self-rated health (SRH), and depression and well-being. As a whole, participants reported moderate health and well-being, little depression, few mobility problems (mean=8.4/40), and very high falls efficacy (mean=94.9/100) despite the fact that a quarter of the sample experienced a fall within the past year. Correlation results indicated that previous falls, falls efficacy, mobility, SRH and depression and well-being were all inter-related. Regression analyses revealed that higher falls efficacy was more closely associated with better SRH than was having previously fallen. Findings suggest that improving falls efficacy in older African American adults may be beneficial to their mobility and overall health and well-being. Further, by asking a single-item SRH question, clinicians may be able to quickly identify older African American adults who have low falls efficacy and are at high risk for falling.

Walking Ability and Its Relationship to Self-Rated Health in Later Life

This study investigated the relationship between self-assessed overall health (SRH) and walking ability among older adults (n = 239) gauged using three well-established measures of walking ability ("normal" and "fast" walking speeds, and perceived walking difficulty). Logistic regression models adjusted for health, behavioral, and sociodemographic variables were used to estimate the relationship between the three measures of walking ability and SRH. Walking ability was significantly associated with SRH; notably, only normal walking speed discriminated between participants in all three SRH comparisons (good versus poor/bad, good versus fair, or excellent versus good). Health care providers, family, and friends should be attentive to reduced walking speed or complaints about difficulty walking because these are harbingers of health decline.

Cultural rationales guiding medication adherence among African American with HIV/AIDS

To date, only modest gains have been achieved in explaining adherence to medical regimens, limiting effective interventions. This is a particularly important issue for African Americans who are disproportionately affected by the HIV epidemic. Few studies have focused on intragroup variation among African Americans in adherence to ART. The aim of this study was to identify and describe the cultural rationales guiding African American patients' formulation and evaluation of adherence. Rationales are key features of purposeful human action. In-depth interviews with 80 seropositive African Americans were tape recorded, transcribed, and analyzed. Participant CD4, viral load and medical histories were collected at each data point. Analysis of four waves of panel data identified three types of adherence rationales: Authoritative Knowledge Rationale (AKR; n=29, 36.3%), Following Doctors' Orders Rationale (DOR; n=24, 30.0%) and Individualized Adherence Rationale (IAR; n=27, 33.8%). Differences in mean reported adherence between the rationale groups did not achieve statistical significance. However, the fraction reporting low adherence (<70%), although not different by rationale group at the first interview (T1), was significantly higher for the IAR group by the fourth interview (T4). Objective clinical markers (CD4 and viral load) improved over time (from T1 to T4) for AKR and DOR groups, but remained unchanged for the IAR group, yet self-reported adherence declined for all groups over the course of the four interviews.

What do we know about older adults and HIV? A review of social and behavioral literature

The fastest growing segment of the United States HIV population is people aged 50 and older. This heterogeneous group includes people with diverse pathways into HIV positive status in later life, including aging with the disease as well as later life-acquired infections. As people with HIV live into older ages, solving problems of successful secondary prevention and ongoing treatment requires more specific knowledge of the particular aging-related contextual sociocultural, psychosocial, and personal factors salient to the situations of persons living with HIV. Greater knowledge of these factors will help solve challenges to reducing psychological burden and promoting health maintenance for people with HIV. Yet, the current literature on aging and HIV remains nascent. To assess the state of knowledge of the sociocultural and behavioral factors associated with aging with HIV, we conducted a systematic critical content review of peer-reviewed social and behavioral research on aging and HIV to answer the question, "How have older age, and social, cultural, and behavioral aspects of the intersection of HIV and age been addressed in the literature?" We searched First Search, Proquest, Psych Info, Pub Med, Wilson Select Plus, and World Cat and identified 1549 articles. We then reviewed these to select peer-reviewed articles reporting results of research on the social and behavioral aspects of living with HIV at age 50 and older. Fifty-eight publications were identified that met study inclusion criteria. While few publications reported clear age-related differences, there were significant ethnic differences in living with HIV in later life and also differences among older people when groups were defined by mode of transmission. Findings are discussed in light of constructs from gerontology which may contribute to clarifying how later life, life course stage, and psychological development intersect with, influence, and are influenced by HIV disease and long-term anti-retroviral therapy use.

Self-rated health among persons with spinal cord injury: what is the role of physical ability?

OBJECTIVES

Self-rated health (SRH) is a powerful concept that has greatly advanced our understanding of health and health outcomes. The SRH measure has become increasingly common in health research. Yet, puzzles remain about what shapes SRH ratings. The absence of knowledge is particularly acute in the context of disability. The aim of this study was to examine the relationship between SRH and self-rated physical ability in a sample of individuals with spinal cord injury (SCI).

METHODS

Data from 140 eligible participants drawn from a study of life in the community after SCI were analyzed. The study, cross-sectional in design, was conducted in a large urban city in the mid-western United States. Basic statistics such as ANOVA and chi-square tests were performed as appropriate, and a multiple linear regression analysis modeled the relationship between SRH and physical ability adjusting for potential confounding variables.

RESULTS

Self-rated physical ability was significantly associated with SRH after controlling for relevant covariates (P < 0.001). An analysis of the interaction between physical ability and level of injury revealed that the relationship was significant for persons with paraplegia but not for persons with tetraplegia.

CONCLUSIONS

This study provides evidence that self-rated physical ability is an important factor associated with SRH for persons with SCI, but that the strength of the relationship depends on level of injury (paraplegia vs. tetraplegia). The challenge for future research is to replicate the study using a more comprehensive measure of physical ability and to ask how beliefs in one's ability to do those activities that are most meaningful and desired shape SRH. Only in this way will our understanding of the physical ability-SRH relationship be clarified.

Self-rated health among spinal cord injury survivors: directions for future research

Aim:

This study was conducted to further the understanding of self-rated health (SRH) in persons with spinal cord injury (SCI).

Methods:

A review of the literature identified four published studies and the National Spinal Cord Injury Statistical Center (NSCISC) database that have evaluated SRH in persons with SCI. This article discusses the SRH findings across the studies and the NSCISC database, and compares these to the broader SRH literature.

Findings:

People with SCI do not rate their health very differently from able-bodied persons and, for the most part, rate their health positively. SRH ratings for persons with SCI may be inextricably linked to age and secondary conditions.

Conclusions:

The analysis suggests that SRH as a concept has been underused in studies with people with SCI. Given the literature that points to the power of SRH to predict many important health outcomes, the authors urge greater consideration of the SRH measure in disability and rehabilitation research and suggest directions for conceptual and measurement development.

The 'risk inventory for persons with spinal cord injury': development and preliminary validation of a risk assessment tool for spinal cord injury

PURPOSE

To present a new short instrument to measure perceived risks of common everyday activities engaged in by persons with spinal cord injury (SCI), and to provide preliminary data on its psychometric properties.

METHOD

Community-dwelling men and women with SCI (N = 139) in metropolitan Detroit completed the risk inventory for persons with spinal cord injury (RISCI). They also answered a risk-taking identity question ('Are you a risk-taker'?) and completed the risk orientation questionnaire (ROQ) (Rohrmann, http://www.rohrmannresearch.net/ , 2008), a risk propensity measure.

RESULTS

All items of the RISCI correlated positively with each other and the total score; internal reliability as measured by Cronbach's alpha was 0.86. Principal components factor analysis confirmed a one-factor structure which explained 41% of the variance. A three-factor solution with readily interpretable factors explained 64% of the variance. Content validity was established through extensive consultations with persons with SCI in the development of the measure. Discriminant validity was supported by the ability of the RISCI to distinguish between subsamples (for example, between men and women, those with paraplegia and tetraplegia) for whom differences in risk assessment might be expected. Criterion validity was supported by significant relationships in the expected directions between the RISCI and risk-taking identity and between the RISCI and the ROQ.

CONCLUSIONS

Findings suggest that the RISCI is a brief, easy to administer and psychometrically sound measure of perceived risk of activities common in daily life for use with persons with SCI.

What is a missed dose? Implications for construct validity and patient adherence

The construct 'missed dose' is central to many assessments of medication adherence. However, few studies have investigated how patients or clinicians conceptualize missed doses or the extent of the concordance or discordance between clinicians and patients. To address this gap we conducted semi-structured interviews with 45 sero-positive African American adults taking HAART and 17 of their clinicians. Results reveal large variability in missed dose conceptions among both patients and physicians and significant differences between the two groups. Overall, patients reported a stricter definition of missed dose than did clinicians. Fifty-five percent of patients thought that a pill-taking delay of six hours beyond the prescribed dosing time constituted a missed dose, by comparison, only one physician agreed with this assessment. More than one-third of patients thought that the proper response to a missed dose would be to skip it altogether, but only about 12% of clinicians agreed. These findings have implications for the construct validity of self-report measures of adherence, for patient adherence behaviours based on missed dose conceptions and for patient-physician relationships and communication within the clinical environment.

Environmental factors and their role in community integration after spinal cord injury

BACKGROUND

The International Classification of Functioning, Disability and Health (ICF) model presents an opportunity to better understand previously neglected longterm social outcomes after traumatic spinal cord injury (SCI), especially the experience of participation.

PURPOSE

The study explored the relationship between perceived environmental barriers and perceived community integration (a participation proxy) in a sample of adults with traumatic SCI.

METHODS

The study interviewed African American and White women and men (n = 136) who had lived with SCI for an average of 11.5 years.

RESULTS

Participants reported environmental barriers at twice the level indicated by previous studies; the natural environment and the policies of government were the most problematic. Levels of community integration were also high. Data suggest a significant relationship (p < .01) between perceived environmental barriers and community integration for adults with SCI, providing support for the ICF model.

IMPLICATIONS

Improved measures and more sophisticated concepts and theories are needed to explicate the relationship between environmental factors and participation concepts in the ICE With respect to practice, occupational therapists need to be aware that removal of environmental barriers is only a first step in the more complex effort to facilitate optimal community integration after SCI.

Sero-positive African Americans' beliefs about alcohol and their impact on anti-retroviral adherence

Alcohol consumption has been associated with HIV disease progression; yet, the nature of this association is poorly understood. This study sought to determine the influence of patient beliefs about alcohol on ART adherence, and elucidate clinician beliefs about drinking and taking ART. Most patients (85%) believed alcohol and ART do not mix. The three alcohol consumption groups, light, moderate, and heavy, differed in their beliefs about drinking and ART with 64% of light and 55% of moderate drinkers skipping ART when drinking compared to 29% of heavy drinkers. Beliefs were derived from folk models of alcohol-ART interaction. Patients 50 and older were less likely to skip ART when drinking. Alcohol appears to affect adherence through decisions to forgo ART when drinking not through drunken forgetfulness. Furthermore, over one-half of clinicians believed alcohol and ART should not be taken together. These findings have implications for patient care and physician training.

Investigating differences among older adults' access to specialized rehabilitation services

The purpose of this study was to (a) describe rehabilitation in-patients aged 65 and older who received specialized occupational therapy home evaluation services and (b) examine these data for evidence of inequalities based on patient gender, race, age, and health insurance status. An archival review was conducted of all in-patient admissions (2,767) to a large urban rehabilitation hospital who were 65 years and older and eligible to receive a home evaluation. Logistic regression was used to predict the likelihood of receiving an occupational therapy home evaluation. Analysis showed that 9.7% of subjects received an in-home evaluation and those who did had significantly longer rehabilitation hospital stays (p < 0.0001) and were significantly more dependent at discharge as measured by the Functional Independence Measure (p < 0.0001) than those who did not. We found no evidence of inequalities on the basis of gender, race, age, and health insurance type after controlling for the level of functional independence of patients. Although this study found little evidence of inequalities, it does raise several critical policy questions including "How many rehabilitation in-patients should receive a home evaluation?" and "How should rehabilitation services be allocated?"

A compliance and satisfaction with home exercise: a comparison of computer-assisted video instruction and routine rehabilitation practice

Computerized educational technology, in various forms, is permeating the health care setting, and clinicians and program managers are charged with evaluating its potential to improve patient health outcomes. The purpose of this randomized controlled trial was to compare two alternative methods of therapeutic exercise instruction in a sample of orthopedic rehabilitation patients (n = 40). The traditional (control) group received routine inpatient rehabilitation exercise education from physical therapists (using demonstrations, verbal feedback, and written materials), and the technology (intervention) group received routine care as described plus one additional therapeutic session in which a customized set of exercises was downloaded from a computerized database to videotape by each patient's therapist and given to the patient for continued use at home. Data on patient compliance and patient satisfaction were collected at patient discharge and at four-week follow-up using a questionnaire designed specifically for this study. Analysis of results showed no significant differences in patient compliance or patient satisfaction between the two study groups. Results of this randomized trial suggest that computerized patient education technology may not provide the benefits anticipated.

Allocation of Rehabilitation Services: Who Gets a Home Evaluation

OBJECTIVE. The purpose of this study was to (a) identify and describe the subpopulation of rehabilitation inpatients who receive specialized occupational therapy home evaluation services, and (b) examine these data for evidence of inequalities in access to services based on patient gender, race, age, and health insurance status.

METHOD. An archival review was conducted of all inpatient admissions (7,871) to a large urban rehabilitation hospital between January 1, 1994, and December 31, 1998. We had complete data on 7,791 of these patients of whom 6,038 were eligible to receive a home evaluation. Patient demographic data and Functional Independence Measure (FIM) data were obtained in electronic form from the hospital information system.

RESULTS. Analysis showed that 12.4% (749/6038) of eligible inpatients received an in-home evaluation, and those who did were significantly more dependent (as measured by the FIM) than those who did not (p &lt; 0.0001). We found no evidence of inequalities in access to this specialized rehabilitation service on the basis of gender, race, age, and type of medical insurance after controlling for level of functional independence.

CONCLUSIONS. This study found no evidence of inequalities in the allocation of home evaluation services. However, it raises the larger question of how we determine whether inequalities exist. A proper assessment of inequalities in service provision requires that we know the principles by which these services should be allocated and have appropriate measures of the application of these principles. For programmatic and policy reasons, more research is needed to develop well-defined principles of resource allocation, and adequate measures of their impact so we can know whether resources and services are distributed in the way we intend.

On the functional significance of the polypeptide PsbY for photosynthetic water oxidation in the cyanobacterium Synechocystis sp. strain PCC 6803

Recent investigations have revealed that the cyanobacterial photosystem II complex contains more than 26 polypeptides. The functions of most of the low-molecular-mass polypeptides, including PsbY, have remained elusive. Here we present a comparative characterization of the wild-type Synechocystis sp. strain PCC 6803 and a PsbY-free mutant derived from it. The results show that growth of the PsbY-free mutant was comparable to that of the wild-type when cells were cultivated in complete BG11 medium or under initial manganese or chloride limitation, and when illuminated at 20 or 200 microE m(-2) s(-1). However, while growth rates of both the wild-type and the PsbY-free mutant were reduced when cells were cultivated in BG11 medium in the absence of calcium, the reduction was significantly greater in the case of the PsbY-free mutant. This differential effect on growth of the mutant relative to the wild-type in CaCl(2) deficient medium was detected when the cells were illuminated with high-intensity light (200 microE m(-2) s(-1)) but not when light levels were lower (20 microE m(-2) s(-1)). The differential effect on growth was associated with lower O(2) evolving activity in the mutant compared to wild-type cells. The mutant was also found to be more sensitive to photoinhibition, and showed an altered pattern of fluorescence emission at 77 K. In addition, mass spectrometric analysis revealed that PsbY-free cells cultivated in CaCl(2) sufficient medium (in which no growth reduction was observed) had a significantly higher O(2) evolution from hydrogen peroxide and a lower O(2) evolution from water under flash light illumination than wild-type cells. These results imply that photosystem II is slightly impaired in the PsbY-free mutant, and that the mutant is less capable of coping with low levels of Ca(2+) than the wild-type.

Longitudinal support for the relationship between vascular risk factors and late-life depressive symptoms

OBJECTIVE

The authors examined longitudinal support for the vascular depression hypothesis by assessing the extent to which baseline vascular burden was associated with depressive symptoms 6 and 18 months after discharge from inpatient medical rehabilitation.

METHODS

One hundred consecutive geriatric rehabilitation patients were assessed during their rehabilitation stay and subsequently screened for depression 6 and 18 months after discharge. Baseline vascular burden was entered into logistic-regression analyses predicting depression at 6 and 18 months after controlling for baseline levels of depression, general medical burden, limitations in activities of daily living, cognitive impairment, and demographic variables including age, education, gender, and race.

RESULTS

Logistic-regression results demonstrated that, after controlling for the covariates described above, baseline vascular burden was associated with increased odds of positive depression screens at 6- and 18-month follow-up assessments. Furthermore, among patients who were not depressed during their rehabilitation stay, vascular burden was predictive of positive depression screens at 6- and 18-month follow-up assessments.

CONCLUSIONS

Greater vascular burden was positively associated with depressive symptoms over time. These findings provide further support for the vascular depression hypothesis in late life and highlight the need for careful clinical monitoring of this frail group of elderly patients.

Occupational therapist home evaluations: inequalities, but doing the best we can?

OBJECTIVE

The purpose of this study was (a) to describe the occupational therapy recommendations provided to patients discharged to inner city homes, and (b) to examine the relationship between patient health insurance and the number and type of occupational therapist recommendations for equipment and home modifications.

METHOD

An archival review was conducted of all referrals to the home evaluation program (n = 755) at a large urban rehabilitation hospital between January 1, 1994, and December 31, 1998. Additional patient demographic data and Functional Independence Measure (FIM) data were obtained in electronic form from the hospital information database.

RESULTS

Analysis of results showed that while the pattern of equipment and modification recommendations varied little, publicly insured patients received fewer home modification recommendations compared to privately insured patients (t = 3.7; p < .0005), and were discharged from rehabilitation with significantly lower functional independence (MANOVA F = 3.9; p = .05).

CONCLUSION

Results alert occupational therapists to the relationship between health insurance and treatment recommendations and point to patient advocacy and health policy as potential pathways to desired a achieve social change.

After rehabilitation: an 18-month follow-up of elderly inner-city women

OBJECTIVE

Elderly inner-city women (n = 125) greater than the age of 60 and living alone and who were consecutively admitted to a large, urban, university-based rehabilitation hospital were followed to (a) examine the power of standardized clinical measures to predict who was living alone 18 months after discharge, (b) determine whether live-alone women at 18 months' follow-up were more independent in instrumental activities of daily living (IADL) than women who were not living alone, and (c) investigate whether women who return home to live alone and have low or declining physical function are at risk for subsequent relocation or death.

METHOD

Data from four standardized assessments (physical function, cognition, comorbidity, and depression) and demographic information were gathered during in-patient rehabilitation. Self-report IADL data were collected via telephone interviews at 3, 6, and 18 months' follow-up.

RESULTS

Statistical analysis of results showed that physical function, cognition, and comorbidity were significant and independent predictors of living alone at 18 months' follow-up. Women living alone at 18 months reported significantly greater IADL independence than women who were not living alone. Path analysis confirmed that the relationship between the clinical measures and living situation at 18 months was mediated by self-reported IADL functioning.

CONCLUSION

Standard clinical data obtained at discharge are useful to identify who can return home to live alone after rehabilitation, but in-home assessment of IADL remains key to understanding the complex skills required to live alone.

What to do about flat heads: preventing and treating positional occipital flattening

Across Canada there has been an increasing incidence of positional occipital flattening. This increase appears to be related to the recent change in infant sleep position to supine. In this paper, two patterns of positional occipital flattening, positional plagiocephaly and positional brachycephaly, are outlined. While there is no evidence of long-term developmental or neurological problems that result from positional occipital flattening, the infant's appearance can be distressing to parents who will then seek treatment. Prevention of positional occipital flattening requires a community approach with timely screening and early intervention should the infant's skull appear flat. Treatment involves repositioning the infant coupled with physiotherapy if there is neck muscle involvement. Should repositioning alone be ineffective, a helmet or headband program may be implemented. Neuroscience nurses can work in partnership with the community to ensure prevention strategies are implemented and timely interventions initiated.

Contrast detection and discrimination in young and older adults

PURPOSE

To determine if age differences in contrast detection thresholds extend to suprathreshold contrast discrimination.

METHODS

Psychophysical contrast detection and discrimination thresholds were determined in 56 adults ranging in age from 22 to 72 years. In experiment 1, thresholds were measured using a two-interval forced-choice procedure across a range of pedestal grating contrasts. In experiment 2, detection and discrimination thresholds were measured at two spatial frequencies and two luminance levels.

RESULTS

When normalized to the contrast detection threshold, contrast discrimination thresholds were similar in young and older adults. This result is akin to previous findings for clinical patients with contrast detection deficits. In addition, contrast discrimination in the elderly is independent of mean display luminance as has been found in young adults.

CONCLUSIONS

Normalized contrast discrimination functions have the same shape in young and older adults and show no change with a 4-fold reduction in luminance.