Patterned thin film enzyme electrodes via spincoating and glutaraldehyde vapor crosslinking: towards scalable fabrication of integrated sensor-on-CMOS devices.

Effective continuous glucose monitoring solutions require consistent sensor performance over the lifetime of the device, a manageable variance between devices, and the capability of high volume, low cost production. Here we present a novel and microfabrication-compatible method of depositing and stabilizing enzyme layers on top of planar electrodes that can aid in the mass production of sensors while also improving their consistency. This work is focused on the fragile biorecognition layer as that has been a critical difficulty in the development of microfabricated sensors. We test this approach with glucose oxidase (GOx) and evaluate the sensor performance with amperometric measurements of in vitro glucose concentrations. Spincoating was used to deposit a uniform enzyme layer across a wafer, which was subsequently immobilized via glutaraldehyde vapor crosslinking and patterned via liftoff. This yielded an approximately 300 nm thick sensing layer which was applied to arrays of microfabricated platinum electrodes built on blank wafers. Taking advantage of their planar array format, measurements were then performed in high-throughput parallel instrumentation. Due to their thin structure, the coated electrodes exhibited subsecond stabilization times after the bias potential was applied. The deposited enzyme layers were measured to provide a sensitivity of 2.3 ± 0.2 µA mM-1 mm-2 with suitable saturation behavior and minimal performance shift observed over extended use. The same methodology was then demonstrated directly on top of wireless CMOS potentiostats to build a monolithic sensor with similar measured performance. This work demonstrates the effectiveness of the combination of spincoating and vapor stabilization processes for wafer scale enzymatic sensor functionalization and the potential for scalable fabrication of monolithic sensor-on-CMOS devices.

Day-to-day variability of stress biomarkers during a music intervention in people living with dementia and their family caregivers.

Examination of the variability of stress biomarkers among people living with dementia and their family caregivers can provide evidence of stress reactions and corresponding self-regulation capacities, but no such research has been conducted to date. The aim of this study was to examine day-to-day variability patterns of salivary biomarkers in dyads of people living with dementia and their family caregivers and to investigate differences in variability patterns between music intervention and control groups. This study involved secondary analysis of data collected during a two-group, non-randomized open trial examining the effects of an 8-week music intervention on physiological stress markers. A total of 5791 salivary samples from 34 dyads were used to analyze the variability of morning and evening cortisol and of morning dehydroepiandrosterone sulfate (DHEA-S). The variability indices employed were the intra- and inter-individual standard deviation, coefficient of variation, and intra-class correlation coefficient. We found that family caregivers in the music intervention group had significantly greater coefficients of variation for all three biomarker endpoints than those in the control group. Our findings provide evidence that stress biomarkers in family caregivers with functional self-regulation capacities may be more likely to respond to music intervention. However, stress biomarkers in people living with dementia may not be responsive to music intervention, possibly due to their dysfunctional self-regulation capacities. Future stress biomarker studies involving dyads of people living with dementia and family caregivers should consider biomarker variability patterns in determining the effectiveness of behavioral interventions.

Characteristics and Correlates of Perceived Physical and Psychological Health Among Family Caregivers Living With Persons With Advanced Dementia.

BACKGROUND: Various factors drive a care setting shift from institutional to home settings for dementia care until the latest stage of the disease, suggesting the critical role of family caregivers living with persons with dementia. OBJECTIVES: This study explored the characteristics and correlates of self-reported overall physical and psychological (ie, depressive symptoms and stress) health among family caregivers living with persons with dementia in Sweden. METHODS: This cross-sectional, descriptive study used baseline data from an existing music-based intervention study of persons with dementia and their family caregivers (N = 76). Multivariable linear regression analyses were performed. RESULTS: On average, caregivers (n = 38; mean age: 74.8 years) were slightly younger than persons with dementia (n = 38; mean age: 78.6 years). Most caregivers were female (n = 24; 63.2%) and spouses or partners of persons with dementia (n = 37; 97.4%). Caregivers' perceived relationship with their family members with dementia was the only factor associated with caregivers' self-reported overall physical health (b = -0.655, p = .046). This suggests caregivers' more frequent feeling of a good relationship with the persons with dementia was linked to better self-rated physical health among family caregivers living with persons with dementia. CONCLUSIONS: This study highlights the importance of family caregivers' perceived relationship with persons with dementia in the context of caregivers' self-reported physical health. Future research is needed to explore the perceived relationship from the perspectives of persons with dementia and the determinants of caregiving dyads' (persons with dementia and family caregivers) perceived relationship with each other.

Location-aware ingestible microdevices for wireless monitoring of gastrointestinal dynamics.

Localization and tracking of ingestible microdevices in the gastrointestinal (GI) tract is valuable for the diagnosis and treatment of GI disorders. Such systems require a large field-of-view of tracking, high spatiotemporal resolution, wirelessly operated microdevices and a non-obstructive field generator that is safe to use in practical settings. However, the capabilities of current systems remain limited. Here, we report three dimensional (3D) localization and tracking of wireless ingestible microdevices in the GI tract of large animals in real time and with millimetre-scale resolution. This is achieved by generating 3D magnetic field gradients in the GI field-of-view using high-efficiency planar electromagnetic coils that encode each spatial point with a distinct magnetic field magnitude. The field magnitude is measured and transmitted by the miniaturized, low-power and wireless microdevices to decode their location as they travel through the GI tract. This system could be useful for quantitative assessment of the GI transit-time, precision targeting of therapeutic interventions and minimally invasive procedures.

Assessing stress using repeated saliva concentration of steroid hormones in dementia care dyads: results from a controlled pilot care music intervention.

Background: Stress-related biomarkers have the potential to provide objective measures of whether interventions directed at people with dementia (PWD) and their family caregivers (FCG) are successful. The use of such biomarkers has been limited by logistical barriers to sample collection. Objective: Explore saliva concentration of steroid hormones in dementia care dyads during a music intervention. Methods: Consecutive PWD attending a memory evaluation center and their FCG were allocated to either an intervention-with-music or a non-intervention control group. All were living at home. Stress biomarkers, salivary cortisol and dehydroepiandrosterone sulfate (DHEA-S) samples were collected by the PWD and their FCG, in the morning and evening, 5 days a week, for 8 consecutive weeks. Biomarker concentrations of the intervention and the control groups were compared at week 8, in an intention-to-treat approach with adjustment for baseline value. Results: Twenty-four PWD in the intervention group and 10 in the control group, and their FCG were included in the analyses. The mean number of morning saliva collections was similar in the intervention and the control groups, ranging from 4.3 to 4.9 per participant weekly during the first 7 weeks, declining to 3.3 during week 8. Median log morning cortisol (pg/mL) among caregivers was lower in the intervention group than in the control group (8.09 vs. 8.57, P = 0.0133). Conclusion: This study demonstrates that music intervention was associated with lower morning saliva cortisol concentrations for FCGs.

In-home online music-based intervention for stress, coping, and depression among family caregivers of persons with dementia: A pilot study.

Little is known about how music affects family caregivers who provide care to persons with dementia at home. We examined the effects of an 8-week online music-based intervention on self-reported stress, coping, and depression among dementia family caregivers. Mann-Whitney U test and Wilcoxon signed-ranked tests were performed to examine between- and within-group differences between intervention (n = 24) and comparison (n = 11) groups from baseline to post-test. The coping subscale yielded a significant difference between the groups at post-test (U=76.50, Z=-1.978, p=0.048), indicating the intervention group had better coping than the comparison group at post-test. Significant within-group differences in overall stress (Z=-2.200, p=0.028) and coping subscale (Z=-1.997, p=0.046) in the comparison group at post-test suggest that overall stress and coping were maintained throughout the study in the intervention group, whereas the comparison group had higher overall stress and lower coping at post-test. Our in-home music-based intervention showed potential benefits for dementia family caregivers.

The Feasibility and Acceptability of In-Home Saliva Collection for Stress in Persons With Dementia and Their Family Caregivers.

BACKGROUND: Although increasing attention is being paid to cortisol and the sulfated form of dehydroepiandrosterone (DHEA-S) as stress biomarkers, the feasibility of saliva collection of such biomarkers has yet to be investigated among dementia care dyads (persons with dementia [PWD] and family caregivers) living in a home setting. We explored the feasibility and acceptability of in-home saliva collection for cortisol and DHEA-S as stress biomarkers among dementia care dyads. METHODS: Dementia care dyads were recruited from a memory evaluation center. After pre-evaluation and education sessions, participants collected their saliva 3 times a day, 5 days a week, for 8 consecutive weeks. We calculated frequency counts and percentages to assess enrollment rate, retention rate, the completion rate of saliva collection, and valid samples of cortisol and DHEA-S. Independent samples t-tests were performed to compare mean differences in the total number of collected samples and valid samples between PWD and family caregivers at each time point of saliva collection. RESULTS: A total of 46 dyads were referred to this study; 32 dyads (69.6%) agreed to participate, and 26 started collecting saliva. Twenty-four dyads (75%) completed 8 weeks of saliva collection. There were no significant differences (p > 0.05) in the number of collected samples and valid samples between PWD and caregiver participants. CONCLUSION: This study supports the feasibility of in-home saliva collection for stress biomarker assay and the need for further investigation into self-administered collection of stress biomarkers with a particular focus on dementia care dyads living at home.

The use of saliva steroids (cortisol and DHEA-s) as biomarkers of changing stress levels in people with dementia and their caregivers: A pilot study.

The rationale was to explore the efficacy/sensitivity of using morning and evening cortisol levels as biomarkers for stress reduction in persons with dementia (PWDs) and their family caregivers (FCGs) participating in a music intervention program. Thirty-two PWD and their FGC were recruited to an 8-week, home-based music intervention program. Daily home-based collection of saliva samples took place at bedtime and upon awakening. Cortisol was analyzed in the morning and evening saliva samples and DHEA-s in the morning samples. Trends over 40 workdays (15-40 observations per subject) were assessed using linear regression analysis. Twenty-three PWD (72% of invited, 16 men and 7 women, age 69-93) and 24 caregivers (75%, 8 men and 16 women, age 37-90) completed the intervention for at least 6 weeks and were included in the analysis. One-fourth of the PWD and FCG had decreasing evening cortisol, accompanied by decreasing morning cortisol levels. In one-fourth of the participants the ratio between cortisol and DHEA-S in the morning samples was improved, indicating improved balance between energy mobilization and regeneration. Several participants showed no significant endocrine change. There was a statistically significant (two-sided test) correlation within the PWD-caregiver dyads in evening cortisol trend and a statistically significant decrease (two-sided test) in the morning-evening cortisol slope for the FCG group. Reduction in stress, as measured by evening cortisol, was observed in a substantial number of the participants. Recording endocrine stress is helpful for the unbiased assessment of the intervention.

Wireless 3D Surgical Navigation and Tracking System With 100µm Accuracy Using Magnetic-Field Gradient-Based Localization.

This paper describes a high-resolution 3D navigation and tracking system using magnetic field gradients, that can replace X-Ray fluoroscopy in high-precision surgeries. Monotonically varying magnetic fields in X, Y and Z directions are created in the field-of-view (FOV) to produce magnetic field gradients, which encode each spatial point uniquely. Highly miniaturized, wireless and battery-less devices, capable of measuring their local magnetic field, are designed to sense the gradient field. One such device can be attached to an implant inside the body and another to a surgical tool, such that both can simultaneously measure and communicate the magnetic field at their respective locations to an external receiver. The relative location of the two devices on a real-time display can enable precise surgical navigation without using X-Rays. A prototype device is designed consisting of a micro-chip fabricated in 65nm CMOS technology, a 3D magnetic sensor and an inductor-coil. Planar electromagnetic coils are designed for creating the 3D magnetic field gradients in a 20×20×10 cm3 of scalable FOV. Unambiguous and orientation-independent spatial encoding is achieved by: (i) using the gradient in the total field magnitude instead of only the Z-component; and (ii) using a combination of the gradient fields to correct for the non-linearity and non-monotonicity in X and Y gradients. The resultant X and Y FOV yield ≥90% utilization of their respective coil-span. The system is tested in vitro to demonstrate a localization accuracy of m in 3D, the highest reported to the best of our knowledge.

An Interventional strategy of physical activity promotion for reduction of menopause symptoms.

Background: Physical activity (PA) programs are inexpensive, non-pharmaceutical and universally accessible options with demonstrated efficacy in reducing menopausal symptoms. The purpose of this study was to determine the effectiveness of a behavioral strategy for initiating and sustaining PA with the hope to reduce or eliminate menopausal symptoms. Methods : Menopausal and perimenopausal women (n=190) were randomly assigned to intervention (n=95) and non-intervention (n=95) groups using a random-numbers table. The intervention group consisted of 18 neighborhood network subgroups, each consisting of five to six women known to one another. They participated in a 12-week regular PA program, augmented by eight interactive group education and discussion sessions. The Menopause Rating Scale (MRS) self-report instrument was used to determine perceived severity of menopausal symptoms. Results: The intervention group showed a significant reduction in the frequency and severity of menopausal symptoms (P < 0.001). Those whose symptoms rated severe/very severe for hot flushes were reduced from 30.1% to 11.8%. Also, participants whose sleep problems and joint discomfort rated severe/very severe declined from 28% to 6.5% and joint discomfort rated severe or very severe was reduced from 52.7% to 4.4%, respectively. Conversely in the nonintervention group, hot flushes, sleep problems and joint problems got significantly worse(P < 0.05). Conclusion: Implementing educational program that increases awareness of PA benefits in combination with existing neighborhood networks that facilitate communication and cooperation may increase PA levels and decrease menopausal symptoms. Such networks offer alow-cost means of improving quality of life (QOL) for perimenopausal and menopausal women.

Academic Leadership Roles and the Promotion of Research, Education, and Practices That Reframe Aging.

Healthy aging represents an aspect of nursing science where there is accelerating academic interest in a topic that is of great public interest. Thus, an opportunity presents to consider how best to leverage academic leadership roles to assure a forward-looking curriculum, foster relevant research, and communicate results to the public. There are many roles that academic nursing leaders can play in advancing transformational ideas such as healthy aging, including acting as incubator and resource, hub and bridge, educational futurist, and public advocate. Nursing brings to this transformational task knowledge of the need for evidence-based research to guide policy and decision making as it relates to aging, clinical experience, and an ability to convey to a non-professional audience the clinical experience and research results. [Journal of Gerontological Nursing, 45(12), 28-32.].

A 41.2 nJ/class, 32-Channel On-Chip Classifier for Epileptic Seizure Detection.

A 41.2 nJ/class, 32-channel, patient-specific onchip classification architecture for epileptic seizure detection is presented. The proposed system-on-chip (SoC) breaks the strict energy-area-delay trade-off by employing area and memoryefficient techniques. An ensemble of eight gradient-boosted decision trees, each with a fully programmable Feature Extraction Engine (FEE) and FIR filters are continuously processing the input channels. In a closed-loop architecture, the FEE reuses a single filter structure to execute the top-down flow of the decision tree. FIR filter coefficients are multiplexed from a shared memory. The 540 × 1850 µm2 prototype with a 1kB register-type memory is fabricated in a TSMC 65nm CMOS process. The proposed on-chip classifier is verified on 2253 hours of intracranial EEG (iEEG) data from 20 patients including 361 seizures, and achieves specificity of 88.1% and sensitivity of 83.7%. Compared to the state-of-the-art, the proposed classifier achieves 27 × improvement in Energy-AreaLatency product.

Nursing schools and academic health centers: toward improved alignment and a synergistic partnership.

This paper presents the findings from a national survey which the University of Washington conducted among leaders of 32 US academic nursing institutions that are part of academic health centers (AHCs) and complements these findings with results from a separate report by the American Association of Colleges of Nursing. While expressing overall satisfaction with their AHC relationships, these leaders find that nursing is often given greater parity in matters of education and research than in mission setting, financial, and governance matters. AHCs are being asked to meet new health care challenges in new ways, starting with the education of health care professionals. AHCs need to be restructured to give nursing full parity if the nation's and world's needs for preventive and clinical care are to be best met.

The relationship between geographical and social space and approaches to care among rural and urban caregivers caring for a family member with Dementia: a qualitative study.

Knowledge about family caregivers in rural areas remains sparse. No studies to date have addressed the sociocultural aspects in caregiving, thus neglecting potentially significant data. This study aimed to explore and better understand family caregivers' experiences in rural and urban areas and the sociocultural spheres that these two areas represent. How do family caregivers approach their caregiving situation? A hermeneutical approach was chosen to uncover the underlying meanings of experiences. Open-ended in-depth interviews were conducted. The ontological and epistemological roots are based on hermeneutic philosophy, where a human being's existence is viewed as socially constructed. The study followed a purposeful sampling. Semi-structured in-depth interviews were conducted with 12 rural and 11 urban family caregivers to persons with dementia. These were then analyzed in accordance with the hermeneutical process. The findings provide insight into the variations of family caregiver approaches to caregiving in rural and urban areas of Sweden. There seemed to be a prevalence of a more accepting and maintaining approach in the rural areas as compared to the urban areas, where caregiving was more often viewed as an obligation and something that limited one's space. Differences in the construction of family identity seemed to influence the participants approach to family caregiving. Therefore, community-based caregiving for the elderly needs to become aware of how living within a family differs and how this affects their views on being a caregiver. Thus, support systems must be individually adjusted to each family's lifestyles so that this is more in tune with their everyday lives.

Localization of microscale devices in vivo using addressable transmitters operated as magnetic spins.

The function of miniature wireless medical devices, such as capsule endoscopes, biosensors and drug-delivery systems, depends critically on their location inside the body. However, existing electromagnetic, acoustic and imaging-based methods for localizing and communicating with such devices suffer from limitations arising from physical tissue properties or from the performance of the imaging modality. Here, we embody the principles of nuclear magnetic resonance in a silicon integrated-circuit approach for microscale device localization. Analogous to the behaviour of nuclear spins, the engineered miniaturized radio frequency transmitters encode their location in space by shifting their output frequency in proportion to the local magnetic field; applied field gradients thus allow each device to be located precisely from its signal's frequency. The devices are integrated in circuits smaller than 0.7 mm3 and manufactured through a standard complementary-metal-oxide-semiconductor process, and are capable of sub-millimetre localization in vitro and in vivo. The technology is inherently robust to tissue properties, scalable to multiple devices, and suitable for the development of microscale devices to monitor and treat disease.

Hardware-friendly seizure detection with a boosted ensemble of shallow decision trees.

Efficient on-chip learning is becoming an essential element of implantable biomedical devices. Despite a substantial literature on automated seizure detection algorithms, hardware-friendly implementation of such techniques is not sufficiently addressed. In this paper, we propose to employ a gradientboosted ensemble of decision trees to achieve a reasonable trade-off between detection accuracy and implementation cost. Combined with the proposed feature extraction model, we show that these classifiers quickly become competitive with more complex learning models previously proposed for hardware implementation, with only a small number of low-depth (d <; 4) "shallow" trees. The results are verified on more than 3460 hours of intracranial EEG data including 430 seizures from 27 patients with epilepsy.

Silicon-photonic PTAT temperature sensor for micro-ring resonator thermal stabilization.

We present a scheme for thermal stabilization of micro-ring resonator modulators through direct measurement of ring temperature using a monolithic PTAT temperature sensor. The measured temperature is used in a feedback loop to adjust the thermal tuner of the ring. The closed-loop feedback system is demonstrated to operate in presence of thermal perturbations at 20Gb/s.

Family caregivers' assessments of caring for a relative with dementia: a comparison of urban and rural areas.

AIM: This study aimed to describe and compare urban and rural family caregivers' reactions to caring for a relative with dementia and to examine the associations between caregiving and socio-demographic factors. BACKGROUND: Most studies on family caregivers' experiences caring for older people with dementia have been conducted in urban areas, and little is known about the experiences of family caregivers living in rural areas. DESIGN: A cross-sectional study design was used. METHODS: A total of 102 caregivers (response rate 85%) from urban (n=57) and rural (n=46) areas completed the Caregiver Reaction Assessment (CRA) Scale and demographic information. Data were analysed using descriptive and inferential statistics and linear regression models. RESULTS: Overall, family caregivers reported high satisfaction even if they also reported high impact on finances and daily living. Rural caregivers experienced a higher negative impact on finances but reported more support from family members than urban caregivers. Age, gender and relationship were significantly associated with four of the five CRA subscales. Educational level and geographical setting were not associated with any of the CRA subscales. CONCLUSIONS: The results of the study raise questions about the financial situation of older female caregivers and on the expectations of built-in family structures in urban and rural areas. Further studies focusing on the meaning and constitution of a family would help us to understand how these factors influence family caregiving both in rural and urban areas. IMPLICATIONS FOR PRACTICE: To provide person-centred care and to avoid stereotyped caregiving, a better picture of traditions in family caregiving can improve a more differentiated and appropriate professional caregiving pliable with the cultural context in which it is carried out.