A systematic review of cellular therapies for the treatment of limbal stem cell deficiency affecting one or both eyes

PURPOSE

This systematic review (SR) assessed the efficacy, safety and cost-effectiveness of cell-based therapy to manage limbal stem cell deficiency (LSCD), a sight-threatening orphan condition most frequently associated with severe chemical or thermal burns. LSCD has historically been treated by transplanting limbal tissue. In 1997, a new treatment, cultured limbal epithelial autografts, was described for unilateral LSCD. In cases of bilateral disease cultured autologous oral mucosa stem cells have been used. The relative efficacy of different cultured tissue procedures is unknown.

METHODS

A protocol was registered with PROSPERO (CRD42017081117). Searches were conducted in 14 databases and 6 conference websites. Two reviewers independently selected studies, conducted data extraction and assessed risk of bias. One reviewer extracted individual patient data (IPD); a second checked extracted data. Data were assessed to determine the feasibility of statistical analysis, with Bayesian synthesis used to estimate improvement achieved by different treatments.

RESULTS

Fifty-two studies were eligible for inclusion (1113 eyes); 41 studies (716 eyes) reported IPD. No evidence was identified on cost-effectiveness. This SR was unable to confirm that any of the types of ex vivo cultured stem cell transplants identified for LSCD treatment were statistically superior when assessed against the outcomes of interest.

CONCLUSIONS

We believe this SR is the first to include IPD analysis of LSCD data. There is no evidence for the superiority of any method of limbal stem cell transplant. Confirmation of the safety and efficacy of this treatment modality is challenging due to heterogeneity within and between the studies identified. Therefore, recommendations for future research are proposed.

First Nations Food Environments: Exploring the Role of Place, Income, and Social Connection

BACKGROUND

In Canada, few studies have examined how place shapes Indigenous food environments, particularly among Indigenous people living in southern regions of Ontario.

OBJECTIVE

This paper examines and compares circumstances of food insecurity that impact food access and dietary quality between reserve-based and urban-based Indigenous peoples in southwestern Ontario.

METHODS

This study used a community-based survey containing a culturally adapted food-frequency questionnaire and cross-sectional study design to measure food insecurity, food access, and dietary quality among Indigenous respondents living in urban (n = 130) and reserve-based (n = 99) contexts in southwestern Ontario.

RESULTS

Rates of food insecurity are high in both geographies (55% and 35% among urban- and reserve-based respondents, respectively). Urban-based participants were 6 times more likely than those living on-reserve to report 3 different measures of food insecurity. Urban respondents reported income to be a significant barrier to food access, while for reserve-based respondents, time was the most pressing barrier. Compared with recommendations from Canada's Food Guide, our data revealed overwhelming trends of insufficient consumption in 3 food categories among all respondents. Close to half (54% and 52%) of the urban- and reserve-based samples reported that they eat traditional foods at least once a week, and respondents from both groups (76% of urban- and 52% of reserve-based respondents) expressed interest in consuming traditional foods more often.

CONCLUSIONS

Indigenous Food Sovereignty and community-led research are key pathways to acknowledge and remedy Indigenous food insecurity. Policies, social movements, and research agendas that aim to improve Indigenous food security must be governed and defined by Indigenous people themselves. Indigenous food environments constitute political, social, and cultural dimensions that are infinitely place based.

Improved Limit on Neutrinoless Double-Beta Decay in ^{130} Te with CUORE

We report new results from the search for neutrinoless double-beta decay in ^{130} Te with the CUORE detector. This search benefits from a fourfold increase in exposure, lower trigger thresholds, and analysis improvements relative to our previous results. We observe a background of (1.38±0.07)×10^{-2}  counts/(keV kg yr)) in the 0νββ decay region of interest and, with a total exposure of 372.5 kg yr, we attain a median exclusion sensitivity of 1.7×10^{25}  yr. We find no evidence for 0νββ decay and set a 90% credibility interval Bayesian lower limit of 3.2×10^{25}  yr on the ^{130} Te half-life for this process. In the hypothesis that 0νββ decay is mediated by light Majorana neutrinos, this results in an upper limit on the effective Majorana mass of 75-350 meV, depending on the nuclear matrix elements used.

Positive adaptation of HPA axis function in women during 44 weeks of infantry-based military training

BACKGROUND

Basic military training (BMT) is a useful model of prolonged exposure to multiple stressors. 8-12 week BMT is associated with perturbations in the hypothalamic-pituitary-adrenal (HPA) axis which could predispose recruits to injury and psychological strain. However, characterisations of HPA axis adaptations during BMT have not been comprehensive and most studies included few if any women.

METHODS

We studied women undertaking an arduous, 44-week BMT programme in the UK. Anxiety, depression and resilience questionnaires, average hair cortisol concentration (HCC), morning and evening saliva cortisol and morning plasma cortisol were assessed at regular intervals throughout. A 1-h dynamic cortisol response to 1 μg adrenocorticotrophic hormone-1-24 was performed during weeks 1 and 29.

RESULTS

Fifty-three women (aged 24 ± 2.5 years) completed the study. Questionnaires demonstrated increased depression and reduced resilience during training (F 6.93 and F 7.24, respectively, both p < 0.001). HCC increased from 3 months before training to the final 3 months of training (median (IQR) 9.63 (5.38, 16.26) versus 11.56 (6.2, 22.45) pg/mg, p = 0.003). Morning saliva cortisol increased during the first 7 weeks of training (0.44 ± 0.23 versus 0.59 ± 0.24 μg/dl p < 0.001) and decreased thereafter, with no difference between the first and final weeks (0.44 ± 0.23 versus 0.38 ± 0.21 μg/dl, p = 0.2). Evening saliva cortisol did not change. Fasting cortisol decreased during training (beginning, mid and end-training concentrations: 701 ± 134, 671 ± 158 and 561 ± 177 nmol/l, respectively, p < 0.001). Afternoon basal cortisol increased during training while there was a trend towards increased peak stimulated cortisol (177 ± 92 versus 259 ± 13 nmol/l, p = 0.003, and 589 ± 164 versus 656 ± 135, p = 0.058, respectively).

DISCUSSION

These results suggest a normal stress response in early training was followed quickly by habituation, despite psychological and physical stress evidenced by questionnaire scores and HCC, respectively. There was no evidence of HPA axis maladaptation. These observations are reassuring for women undertaking arduous employment.

Evaluation of the BAX® System for Detection of Listeria monocytogenes in Foods: Collaborative Study

A multilaboratory study was conducted to compare the automated BAX® system and the standard cultural methods for detection of Listeria monocytogenes in foods. Six food types (frankfurters, soft cheese, smoked salmon, raw, ground beef, fresh radishes, and frozen peas) were analyzed by each method. For each food type, 3 inoculation levels were tested: high (average of 2 CFU/g), low (average of 0.2 CFU/g) and uninoculated controls. A total of 25 laboratories representing government and industry participated. Of the 2335 samples analyzed, 1109 were positive by the BAX system and 1115 were positive by the standard method. A Chi square analysis of each of the 6 food types, at the 3 inoculation levels tested, was performed. For all foods, except radishes, the BAX system performed as well as or better than the standard reference methods based on the Chi square results.

Evaluation of the BAX® System for Detection of Salmonella in Selected Foods: Collaborative Study

A multilaboratory study was conducted to compare the automated BAX® System to the standard cultural methods for detection of Salmonella in selected foods. Five food types—frankfurters, raw ground beef, mozzarella cheese, raw frozen tilapia fish, and orange juice—at 3 inoculation levels, were analyzed by each method. A sixth food type, raw ground chicken, was tested using 3 naturally contaminated lots. A total of 16 laboratories representing government and industry participated. In this study, 1386 samples were analyzed, of which 1188 were paired samples and 198 were unpaired samples. Of the 1188 paired samples, 461 were positive by both methods and 404 were negative by both methods. Thirty-seven samples were positive by the BAX System but negative by the standard reference method, and 11 samples were positive by standard cultural method and negative by the BAX System. Of the 198 unpaired samples, 106 were positive by the BAX System and 60 were positive by the standard cultural method. A Chi square analysis of each of the 6 food types, at the 3 inoculation levels tested, was performed. For all foods, the BAX System demonstrated results comparable to those of the standard reference methods based on the Chi square results.

Mobility impairments and geographic variation in vulnerability to household food insecurity

Studies indicate an association between disability and higher rates of household food insecurity (HFI). Geographic variation in this relationship has not been explored despite the potential influence of economic and political contexts, including costs of living and disability social assistance. This study examines the association between mobility impairment and HFI within and across Canada considering the possible role of population composition, contextual, and collective influences. Using data from 217,094 adults from the 2007/08, 2009/10, 2013/14, and 2015/16 Canadian Community Health Survey, multivariate logistic regression models examined associations between mobility impairment and HFI controlling for socio-demographic factors and geography of residence (i.e., province, region, and urban/rural status). Subsequent analysis of 14,353 surveyed adults with mobility impairments was conducted to examine geographic and socio-demographic factors associated with HFI in this population. Adults with mobility impairments had elevated odds of HFI of 3.85 (95% CI: 3.49-4.24), when adjusting for age, sex, and geography of residence and 2.11 (95% CI: 1.89-2.35) adjusting for additional socio-demographic characteristics. Across Canada, mobility impaired adults experienced greater odds of HFI. Significantly lower odds of HFI were found for mobility impaired adults living in Newfoundland, Alberta, and Saskatchewan compared to Ontario when adjusting for age and sex, and in Quebec when controlling for additional socio-demographic factors. Socioeconomic factors and age accounted for most variation in HFI in this population, suggesting the importance of poverty reduction strategies that reduce vulnerability to HFI across the population.

Disability and food access and insecurity: A scoping review of the literature

A scoping review was conducted, using a social ecological model approach, of 106 articles examining the effect of disability on food access and (in)security. Results of the review show a consistently increased risk of food insecurity among people with disabilities with a higher risk for mental health disabilities, and among disabled younger adults. Mediators of this relationship were underexplored. Disability was mainly conceptualized as a problematic category preventing food access while ignoring disabling social and environmental barriers. A social model of disability can inform future research by acknowledging the role of socio-environmental influences on the production and experience(s) of disability.

Healthy spaces: Exploring urban Indigenous youth perspectives of social support and health using photovoice

Ongoing injustices perpetrated by colonization and racism have resulted in a disproportionate burden of health disparities among Indigenous peoples, with youth being particularly vulnerable. However, very little is known about the health experiences of Indigenous youth, particularly how they understand and interpret such experiences. In collaboration with an Indigenous-led youth program, this research explored the relationship between social support and health among a unique group of Indigenous youth living in Winnipeg, Canada. Through Photovoice, youth revealed how residential mobility and racism negatively influenced the types of social support and relationships formed, and called for improved access to health-promoting social programs.

Using electronic patient records: defining learning outcomes for undergraduate education

BACKGROUND

Healthcare professionals are required to access, interpret and generate patient data in the digital environment, and use this information to deliver and optimise patient care. Healthcare students are rarely exposed to the technology, or given the opportunity to use this during their training, which can impact on the digital competence of the graduating workforce. In this study we set out to develop and define domains of competence and associated learning outcomes needed by healthcare graduates to commence working in a digital healthcare environment.

METHOD

A National Working Group was established in the UK to integrate Electronic Patient Records (EPRs) into undergraduate education for healthcare students studying medicine, pharmacy, nursing and midwifery. The working group, comprising 12 academic institutions and representatives from NHS England, NHS Digital and EPR system providers, met to discuss and document key learning outcomes required for using EPRs in the healthcare environment. Outcomes were grouped into six key domains and refined by the group prior to external review by experts working in medical education or with EPRs.

RESULTS

Six key domains of competence and associated learning outcomes were identified and defined. External expert review provided iterative refinement and amendment. The agreed domains were: 1) Digital Health: work as a practitioner in the digital healthcare environment; 2) Accessing Data: access and interpret patient data to inform clinical decision-making; 3) Communication: communicate effectively with healthcare professionals and patients in the digital environment; 4) Generating data: generate data for and about patients within the EPR; 5) Multidisciplinary working: work with healthcare professionals with and alongside EPRs; and 6) Monitoring and audit: monitor and improve the quality and safety of healthcare.

CONCLUSION

The six domains of competence and associated learning outcomes can be used by academics to guide the integration of EPRs into undergraduate healthcare programmes. This is key to ensuring that the future healthcare workforce can work with and alongside EPRs.

Abdominal volume computed tomography assessment of body composition in dogs

Background

Computed tomography (CT) has been used to estimate body composition and determine tissue distribution in dogs, despite limited validation. This may introduce error into estimates of body composition studies and its effect on health in dogs. Further, the modality has not been validated against dual-energy X-ray absorptiometry (DXA) or over a wide range of dog breeds, ages and sexes. The objective of this study was to validate the use of semi-automated, abdominal volume CT for estimating total body composition of dogs relative to DXA. Twenty-two staff-owned dogs (weighing between 5.1-60 kg) were sedated and underwent full body DXA scan and abdominal CT. Abdominal tissue composition was estimated by CT using semi-automated volume segmentation, over predetermined tissue Hounsfield threshold values. Abdominal tissue composition determined by the various CT threshold ranges was compared to total body composition determined by DXA.

Results

Abdominal tissue composition estimated by CT strongly correlated with the estimates derived from DXA with a small Bland-Altman mean percentage differences in values: total body mass (− 250/2000HU: r² = 0.985; − 1.10%); total fat mass (− 250/-25HU: r² = 0.981; − 1.90%); total lean tissue mass (− 25/150HU: r² = 0.972; 3.47%); and total bone mineral content (150/2000HU: r² = 0.900; − 0.87%). Although averaged CT values compared well to DXA analysis, there was moderate variation in the individual predicted values. There was near perfect inter- and intra-observer agreement in segmentation volumes for abdominal fat.

Conclusions

Abdominal volume computed tomography (CT) accurately and reliably estimates total body composition in dogs, but greater variations may be observed in dogs weighing less than 10 kg.

Distance from Home Birth to Emergency Obstetric Services and Neonatal Outcomes: A Cohort Study

INTRODUCTION

Little is known about the relationship between distance from hospital services and the outcomes of planned home births. We examined whether greater driving distance from a hospital with continuous cesarean capability was associated with a higher risk of adverse neonatal outcome among individuals who were planning to give birth at home.

METHODS

Using an intention-to-treat analysis, we conducted a population-based cohort study of 11,869 individuals who planned to give birth at home in Ontario, Canada, between April 1, 2012, and March 31, 2015. We used postal codes to determine the driving time from maternal residence to the closest hospital offering level 2 or higher maternity care services (ie, hospital with continuous cesarean birth capability). We used log binomial regression analysis to compare the outcomes of individuals who planned a birth more than a 30-minute drive from a level 2 hospital with those of individuals whose births were planned to occur within 30 minutes. We adjusted for maternal age, parity, gestational age, season, and maternal material deprivation quintile.

RESULTS

We found no statistically significant difference in the rates of 5-minute Apgar scores less than 7 (adjusted relative risk [aRR], 1.02; 95% CI, 0.95-1.10; P = .58), perinatal mortality, meconium aspiration syndrome, and emergency medical service usage. Neonates born to individuals who planned to give birth at a greater distance from a hospital had a lower rate of neonatal intensive care unit admission (aRR, 0.6; 95% CI, 0.44-0.81; P = .001).

DISCUSSION

We found no increased risk of adverse neonatal outcomes for births that were planned to occur more than 30 minutes from a hospital. Our findings can be considered, along with individual risk factors and contextual factors, in decision making about the choice of home birth for individuals who live more than half an hour from a hospital with cesarean capacity.

Monitoring of tidal ventilation by electrical impedance tomography in anaesthetised horses

BACKGROUND

Electrical impedance tomography (EIT) is a method to measure regional impedance changes within the thorax. The total tidal impedance variation has been used to measure changes in tidal volumes in pigs, dogs and men.

OBJECTIVES

To assess the ability of EIT to quantify changes in tidal volume in anaesthetised mechanically ventilated horses.

STUDY DESIGN

In vivo experimental study.

METHODS

Six horses (mean ± s.d.: age 11.5 ± 7.5 years and body weight 491 ± 40 kg) were anaesthetised using isoflurane in oxygen. The lungs were mechanically ventilated using a volume-controlled mode. With an end-tidal carbon dioxide tension in the physiological range, and a set tidal volume (VT_vent ) of 11-16 mL/kg (baseline volume), EIT data and VT measured by conventional spirometry were collected over 1 min. Thereafter, VT_vent was changed in 1 L steps until reaching 10 L. After, VT_vent was reduced to 1 L below the baseline volume and then further reduced in 1 L steps until 4 L. On each VT step data were recorded for 1 min after allowing 1 min of stabilisation. Impedance changes within the predefined two lung regions of interest (EIT_ROI ) and the whole image (EIT_thorax ) were calculated. Linear regression analysis was used to assess the relationship between spirometry data and EIT_ROI and EIT_thorax for individual horses and pooled data.

RESULTS

Both EIT_ROI and EIT_thorax significantly predicted spirometry data for individual horses with R² ranging from 0.937 to 0.999 and from 0.954 to 0.997 respectively. This was similar for pooled data from all six horses with EIT_ROI (R² = 0.799; P<0.001) and EIT_thorax (R² = 0.841; P<0.001).

MAIN LIMITATIONS

The method was only tested in healthy mechanically ventilated horses.

CONCLUSIONS

The EIT can be used to quantify changes in tidal volume.

Migration among temporary foreign workers: Examining health and access to health care among Filipina live-in caregivers

In 2015, approximately 14,000 migrants were accepted into Canada as live-in caregivers. While extensive research has documented the working conditions of migrant live-in caregivers, few studies examine the health experiences of this population related to their employment as caregivers. This research examines the relationship between employment under the Federal Government's (Live-in) Caregiver Program and health and access to healthcare services among 21 Filipina caregivers working in the Greater Toronto Area, Ontario. Results of in-depth interviews reveal that long work hours are perceived to negatively affect physical health while separation from family negatively impacts mental health. Among the women interviewed, work responsibilities and living-in the place of employment are perceived to negatively impact both physical and mental health. The research also demonstrates that working as a live-in caregiver both facilitates and creates barriers to accessing health services. Future research is needed to better understand the health of more socially isolated caregivers and caregivers living-out(side) their place of employment.