Topological Data Analysis of Task-Based fMRI Data from Experiments on Schizophrenia

We use methods from computational algebraic topology to study functional brain networks, in which nodes represent brain regions and weighted edges encode the similarity of fMRI time series from each region. With these tools, which allow one to characterize topological invariants such as loops in high-dimensional data, we are able to gain understanding into low-dimensional structures in networks in a way that complements traditional approaches that are based on pairwise interactions. In the present paper, we use persistent homology to analyze networks that we construct from task-based fMRI data from schizophrenia patients, healthy controls, and healthy siblings of schizophrenia patients. We thereby explore the persistence of topological structures such as loops at different scales in these networks. We use persistence landscapes and persistence images to create output summaries from our persistent-homology calculations, and we study the persistence landscapes and images using $k$-means clustering and community detection. Based on our analysis of persistence landscapes, we find that the members of the sibling cohort have topological features (specifically, their 1-dimensional loops) that are distinct from the other two cohorts. From the persistence images, we are able to distinguish all three subject groups and to determine the brain regions in the loops (with four or more edges) that allow us to make these distinctions

Confidence College – an online education tool for neurology patients

COVID-19 and its aftermath highlight the importance of patient self-care and involvement in monitoring and improving their health. Resources to guide this are essential. Our objective was to create a web-based patient education tool, to facilitate patient education and empowerment for people with epilepsy, multiple sclerosis and Parkinson’s disease, available without cost to patients, carers and clinicians. This project was conducted within community and secondary neurology services. Patients and their carers were involved in designing, reviewing and revising the tool, as equal partners with clinicians and digital engineers. A web-based design template was developed with graphics and links to enable patients to create personalised plans. Participants are patients, carers, clinicians (neurology consultants and specialist nurses), neurological charities, the London Neuroscience Clinical Network, NHS England and Shift.ms (a service design team with experience in creating digital services for individuals living with neurological conditions). Shift.ms conducted in-depth interviews. Clinicians used evidence from personal and PubMed databases. Shift.ms analysed and co-ordinated the responses, and designed the pilot tool. Confidence College provides a delivery model for patient education relating to multiple sclerosis, epilepsy and Parkinson’s disease. It requires follow-up evaluation regarding uptake. This web-based accessible patient empowerment tool has no limit on recurrent use, low maintenance costs and no additional costs in up-scaling the number of users. It is ideally suited for use during and after the COVID-19 pandemic

Palliative radiotherapy after oesophageal cancer stenting (ROCS): a multicentre, open-label, phase 3 randomised controlled trial

Background: patients with advanced oesophageal cancer have a median survival of 3-6 months, and most require intervention for dysphagia. Self-expanding metal stent (SEMS) insertion is the most typical form of palliation in these patients, but dysphagia deterioration and re-intervention are common. This study examined the efficacy of adjuvant external beam radiotherapy (EBRT) compared with usual care alone in preventing dysphagia deterioration and reducing service use after SEMS insertion.Methods: this was a multicentre, open-label, phase 3 randomised controlled trial based at cancer centres and acute care hospitals in England, Scotland, and Wales. Patients (aged ≥16 years) with incurable oesophageal carcinoma receiving stent insertion for primary management of dysphagia were randomly assigned (1:1) to receive usual care alone or EBRT (20 Gy in five fractions or 30 Gy in ten fractions) plus usual care after stent insertion. Usual care was implemented according to need as identified by the local multidisciplinary team (MDT). Randomisation was via the method of minimisation stratified by treating centre, stage at diagnosis (I-III vs IV), histology (squamous or non-squamous), and MDT intent to give chemotherapy (yes vs no). The primary outcome was difference in proportions of participants with dysphagia deterioration (&gt;11 point decrease on patient-reported European Organisation for Research and Treatment of Cancer quality of life questionnaire-oesophagogastric module [QLQ-OG25], or a dysphagia-related event consistent with such a deterioration) or death by 12 weeks in a modified intention-to-treat (ITT) population, which excluded patients who did not have a stent inserted and those without a baseline QLQ-OG25 assessment. Secondary outcomes included survival, quality of life (QoL), morbidities (including time to first bleeding event or hospital admission for bleeding event and first dysphagia-related stent complications or re-intervention), and cost-effectiveness. Safety analysis was undertaken in the modified ITT population. The study is registered with the International Standard Randomised Controlled Trial registry, ISRCTN12376468, and ClinicalTrials.gov, NCT01915693, and is completed.Findings: 220 patients were randomly assigned between Dec 16, 2013, and Aug 24, 2018, from 23 UK centres. The modified ITT population (n=199) comprised 102 patients in the usual care group and 97 patients in the EBRT group. Radiotherapy did not reduce dysphagia deterioration, which was reported in 36 (49%) of 74 patients receiving usual care versus 34 (45%) of 75 receiving EBRT (adjusted odds ratio 0·82 [95% CI 0·40-1·68], p=0·59) in those with complete data for the primary endpoint. No significant difference was observed in overall survival: median overall survival was 19·7 weeks (95% CI 14·4-27·7) with usual care and 18·9 weeks (14·7-25·6) with EBRT (adjusted hazard ratio 1·06 [95% CI 0·78-1·45], p=0·70; n=199). Median time to first bleeding event or hospital admission for a bleeding event was 49·0 weeks (95% CI 33·3-not reached) with EBRT versus 65·9 weeks (52·7-not reached) with usual care (adjusted subhazard ratio 0·52 [95% CI 0·28-0·97], p=0·038; n=199). No time versus treatment interaction was observed for prespecified QoL outcomes. We found no evidence of differences between trial group in time to first stent complication or re-intervention event. The most common (grade 3-4) adverse event was fatigue, reported in 19 (19%) of 102 patients receiving usual care alone and 22 (23%) of 97 receiving EBRT. On cost-utility analysis, EBRT was more expensive and less efficacious than usual care.Interpretation: patients with advanced oesophageal cancer having SEMS insertion for the primary management of their dysphagia did not gain additional benefit from concurrent palliative radiotherapy and it should not be routinely offered. For a minority of patients clinically considered to be at high risk of tumour bleeding, concurrent palliative radiotherapy might reduce bleeding risk and the need for associated interventions.Funding: National Institute for Health Research Health Technology Assessment Programme.</p

Gender Differences in Emergency Department (ED) Patient Mechanical Fall Risk and Openness to Communication with Providers

Gender Differences in Emergency Department (ED) Patient Mechanical Fall Risk and Openness to Communication with Providers Bryan G Kane, MD, Michael C Nguyen MD, Robert D Barraco, MD MPH, Brian Stello MD, Arnold Goldberg MD, Clare M Lenhart, PhD MPH, Bernadette G Porter BA ,Anita Kurt PhD, RN, Marna Rayl Greenberg DO, MPH Objectives: The CDC reports that among older adults (≥65), falls are the leading cause of injury-related death and rates of fall-related fractures among older women are more than twice those for men. We set out to determine ED patient perceptions (analyzed by gender) about their personal fall risk compared to their actual risk and their comfort level in discussing their fall history or a home safety plan with their healthcare provider. Methods: After IRB approval, a convenience sample of ED patients (50 years or older) was surveyed at a suburban Level 1 Trauma center with an annual ED census of approximately 75,000. The survey included demographics, the Falls Efficacy Scale (FES), and questions about fall risk. The FES is a validated survey measuring concern of falling. Analysis included descriptive statistics and assessment of fall risk and fear of falling by gender using chi-square and t-tests as indicated. Significance was set at 0.05. Results: Of the 150 surveys collected, 149 indicated gender and were included in this analysis. Fifty-five percent of the sample was female (n=82); 45% (n=67) were male. Most (98%) were Caucasian and 22% reported living alone. There was not a difference in the mean age of female participants 69.79 years (SD=12.08) vs. males 68.06 (SD=10.36; p=0.355). See Table 1 for distribution of reported fall risk factors between genders. Collectively, these variables resulted in a mean risk of falling score of 3.37(SD=1.62) out of 9. On average, female participants had a significantly higher objective risk of falling than did male participants (3.65 vs. 3.02 p=0.018). Similarly, females also reported greater fear of falling than did males (FES score 12.33 vs. 9.62; p=0.005). Significantly more females (41.5%) than males (23.9%, p=0.037) reported having fallen in the past year. Of the 50 participants reporting past-year falls, only 19 (12 female and 7 male, p=0.793) sought treatment. The correlation between actual fall risk and fear of falling were greater among females (p The majority of patients (76.4%) were willing to speak to a provider about their fall risk. No significant difference was noted in willingness to discuss this topic with a provider based on gender (p=0.619), objective fall risk (p=0.145) or FES score (p=0.986). Similarly, many respondents indicated a willing to discuss a home safety evaluation with a provider (58.1%) and responses did not vary significantly by gender (p=.140), objective fall risk (p=0.168) or FES score (p=.584). Conclusion: In this study, female ED patients reported a greater fear of falling, had a significantly higher objective risk of falling, and had a higher correlation between their perceived risk and actual risk of falling than did males. The majority of both genders were amenable to discussing their fall risk and a home safety evaluation with their provider