Ultrasonic measurement of temperature distributions in extreme environments: Electrical power plants testing in utility-scale steam generators.

Thermal heterogeneities within energy conversion and storage, material processing, nuclear processes, aerospace, and military applications are often inaccessible to characterization by insertion sensors. When sensor deployment is possible, conventional pointwise temperature probes quickly degrade when inserted into harsh environments typical of such processes. We developed spatially-resolved ultrasonic thermometry to noninvasively measure the spatial distributions of thermal properties in such applications, even when sizable thermal gradients are present. Our method divides the path of ultrasonic propagation into segments bound by echogenic features, which create echoes in pulse-echo mode, encoding the information about interior temperature distributions. We use the acquired ultrasonic responses to estimate the internal temperature distributions by solving an inverse problem or concatenating segmental estimates. This work describes the implementation and industrial testing of the developed method at a coal-fired electrical power generation plant. We inserted an echogenically segmented Inconel 625 waveguide into the combustion zone of the utility-scale boiler and continuously acquired ultrasonic data while keeping sensitive components away from the damaging combustion environment. The accuracy of the time-dependent temperature distributions reconstructed from the ultrasonic measurements was comparable to that of thermocouples. The resiliency of ultrasonic thermometry to harsh combustion conditions was far superior to conventional insertion sensors. The measurements obtained during plant operation captured daily steam generation cycles in response to changing customer demand and intermittent contributions of renewable power sources to the power grid. These measurements have revealed new insights into the relationship between the dynamic power generation load and the conditions inside the steam generator. The successful industrial testing of spatially-resolved ultrasonic thermometry in solids indicates that the developed technology has matured to become an attractive alternative to conventional sensing in solving challenging problems of long-term thermal characterizations in extreme environments.

Psychometric Evaluation of the Veterans Affairs Bereaved Family Survey in Community Nursing Homes.

CONTEXT: For over a decade, the Department of Veterans Affairs (VA) has used the Bereaved Family Survey (BFS) to measure the quality of end-of-life (EOL) care in VA inpatient settings. In 2019, VA developed a revised version of the BFS to evaluate the quality of EOL care for Veterans who received hospice services in VA-contracted community nursing homes (CNHs). OBJECTIVES: The purpose of this analysis was to evaluate the psychometric properties and factor structure of the BFS-CNH. METHODS: The BFS-CNH was administered to the next-of-kin of Veterans who died in a VA-contracted CNH with hospice care between October 2019 and April 2020. Exploratory factor analysis (EFA) was used with the 10 core items of the BFS-CNH that were derived from the inpatient BFS to evaluate whether the BFS-CNH exhibited a similar factor structure to the inpatient version. Cronbach's alpha was used to assess internal consistency/reliability of the identified factors and linear regression models were used to evaluate construct validity of the identified BFS-CNH factor scores and individual items. RESULTS: The EFA revealed a three-dimension solution that corresponded to factors on the inpatient BFS, including Care and Communication, Emotional and Spiritual Support and Death Benefits. Cronbach's alpha coefficients for all three factors indicated acceptable internal consistency. CONCLUSION: Our findings provide support for use of the BFS-CNH to evaluate the quality of EOL care provided to Veterans in CNHs and lay the foundation for future comparisons of BFS ratings between VA inpatient and CNH settings.

Palliative Care and Documented Suicide: Association Among Veterans With High Mortality Risk.

CONTEXT: Palliative care consultations (PCCs) are associated with reduced physical and psychological symptoms that are related to suicide risk. Little is known, however, about the association between PCCs and death from suicide among patients at high risk of short-term mortality. OBJECTIVE: To examine the association between the number of PCCs and documentation of suicide in a cohort of Veterans at high risk of short-term mortality, before and after accounting for Veterans' sociodemographic characteristics and clinical conditions. METHODS: An observational cohort study was conducted using linked Veterans Affairs clinical and administrative databases for 580,620 decedents with high risk of one-year mortality. Logistic regression models were used to examine the association between number of PCCs and documentation of suicide. RESULTS: Higher percentages of Veterans who died by suicide were diagnosed with chronic pulmonary disease as well as mental health/substance use conditions compared with Veterans who died from other causes. In adjusted models, one PCC in the 90 days prior to death was significantly associated with a 71% decrease in the odds of suicide (OR = 0.29, 95% CI = 0.23-0.37, P < 0.001) and two or more PCCs were associated with a 78% decrease (OR = 0.22, 95% CI = 0.15-0.33, P < 0.001). Associated "number needed to be exposed" estimates suggest that 421 Veterans in this population would need to receive at least one PCC to prevent one suicide. CONCLUSION: While acknowledging the importance of specialized mental health care in reducing suicide among high-risk patients, interventions delivered in the context of PCCs may also play a role.

Family reports of end-of-life care among veterans in home-based primary care: The role of hospice.

BACKGROUND: The Department of Veterans Affairs (VA)'s home-based primary care (HBPC) program provides coordinated, interdisciplinary care to seriously ill and disabled veterans, but few evaluations have considered end-of-life (EOL) care in this population. The aim of this study was to describe veterans' use of community-based hospice services while enrolled in HBPC and their associations with bereaved families' perceptions of care. METHODS: This study was a retrospective analysis of electronic medical record and bereaved family survey (BFS) data for veterans who died while enrolled in VA's HBPC program between October 2013 and September 2019. Seven regional VA networks called Veteran Integrated Service Networks participated in BFS data collection. The final sample included 3967 veterans who were receiving HBPC services at the time of death and whose next-of-kin completed a BFS. The primary outcome was the BFS global rating of care received in the last 30 days of life. Adjusted proportions for all BFS outcomes were examined and compared between those who received community-based hospice services and those who did not. RESULTS: Overall, 52.6% of BFS respondents reported that the care received by HBPC-enrolled veterans in the last 30 days of life was excellent using the BFS global rating. Among families of HBPC-enrolled veterans who received community-based hospice services, the BFS global rating was roughly eight percentage points higher than those who did not (55.7 vs. 47.0%, p < 0.001). On 12 of the 14 secondary BFS outcomes, veterans who received hospice scored higher than those who did not. CONCLUSIONS: Receipt of hospice services while enrolled in HBPC was associated with higher ratings of EOL care by bereaved family members. Integration of community hospice partners for qualifying veterans who are enrolled in the HBPC program represents a potential opportunity to improve the overall experience of EOL care for veterans and their families.

Quality of end-of-life care for Vietnam-era Veterans: Implications for practice and policy.

BACKGROUND: In federal response to the aging population of Vietnam-era Veterans, Congress directed the Department of Veterans Affairs (VA) to create a pilot program to identify and develop best practices for improving hospice care for this population. A first step in VA's response was to identify whether the end-of-life (EOL) care needs and outcomes of Vietnam-era Veterans differed from previous generations. METHODS: Using medical records and bereaved family surveys, we examined clinical characteristics, healthcare utilization, and EOL quality indicators for Vietnam-era Veterans who died in VA inpatient settings between fiscal year 2013-2017. Contemporaneous comparisons were made with World War II/Korean War-era Veterans. RESULTS: Compared to prior generations, higher percentages of Vietnam-era Veterans had mental health/substance use diagnoses and disability. Similar percentages of family members in both groups reported that overall EOL care was excellent; however, post-traumatic stress disorder management ratings by families of Vietnam-era Veterans were significantly lower. CONCLUSIONS: Although current VA EOL practices are largely meeting the needs of Vietnam-era Veterans, greater focus on mental health comorbidity, including post-traumatic stress disorder, Agent Orange-related conditions, and ensuring access to quality EOL care in the community is warranted. IMPLICATIONS: Policymakers and healthcare professionals should anticipate more physical and mental health comorbidities among Veterans at EOL as Vietnam-era Veterans continue to age. Findings are being used to inform the development of standardized EOL care protocols and training programs for non-VA healthcare providers that are tailored to the needs of this population.

End-Of-Life Care in the Time of COVID-19: Communication Matters More Than Ever.

CONTEXT: The COVID-19 pandemic resulted in visitation restrictions across most health care settings, necessitating the use of remote communication to facilitate communication among families, patients and health care teams. OBJECTIVE: To examine the impact of remote communication on families' evaluation of end-of-life care during the COVID-19 pandemic. METHODS: Retrospective, cross-sectional, mixed methods study using data from an after-death survey administered from March 17-June 30, 2020. The primary outcome was the next of kin's global assessment of care during the Veteran's last month of life. RESULTS: Data were obtained from the next-of-kin of 328 Veterans who died in an inpatient unit (i.e., acute care, intensive care, nursing home, hospice units) in one of 37 VA medical centers with the highest numbers of COVID-19 cases. The adjusted percentage of bereaved families reporting excellent overall end-of-life care was statistically significantly higher among those reporting Very Effective remote communication compared to those reporting that remote communication was Mostly, Somewhat, or Not at All Effective (69.5% vs. 35.7%). Similar differences were observed in evaluations of remote communication effectiveness with the health care team. Overall, 81.3% of family members who offered positive comments about communication with either the Veteran or the health care team reported excellent overall end-of-life care vs. 28.4% who made negative comments. CONCLUSIONS: Effective remote communication with the patient and the health care team was associated with significantly better ratings of the overall experience of end-of-life care by bereaved family members. Our findings offer timely insights into the importance of remote communication strategies.

"That is Care That you Just can't fake!": Identifying Best Practices for the Care of Vietnam Veterans at End of Life.

CONTEXT: We reviewed the Veterans Health Administration Bereaved Family Survey's open-ended responses to understand end-of-life (EOL) care best practices for Vietnam and pre-Vietnam Veterans. OBJECTIVES: To identify 1) recommendations for improved EOL care enhancements for older Veterans, 2) a model of best practices in EOL care for Veterans, and 3) any relevant differences in best practices between Vietnam and prior war eras. METHODS: We examined five years of Bereaved Family Survey data (n = 2784), collected between 2013 and 2017, from bereaved family members of Veterans focusing on 2 open-ended questions: 1) Is there anything else you would like to share about the Veteran's care during his last month of life? 2) Is there anything else you would like to share about how the care could have been improved for the Veteran? Applied thematic analysis identified successes and challenges in the experience of the bereaved of Vietnam and pre-Vietnam era Veterans. RESULTS: Regardless of war era and death venue, a patient-centered approach to EOL care with readily available staff who could 1) provide ongoing support, comfort, honor, and validation; 2) routinely adjust to the patient's changing needs; 3) and provide clear, honest, timely, compassionate communication was important to the bereaved. Consideration of the uniqueness of Vietnam Veterans is beneficial. CONCLUSIONS: Patient-centered EOL care should include assigning a point of contact that follows the patient, educates the family on expectations, ensures the patient's changing needs are met, ensures the family has appropriate support, and communicates updates to the family throughout the patient's care continuum.

"Why Couldn't I Go in To See Him?" Bereaved Families' Perceptions of End-of-Life Communication During COVID-19.

BACKGROUND/OBJECTIVE: The COVID-19 pandemic has resulted in rapid changes to end-of-life care for hospitalized older adults and their families, including visitation restrictions. We examined bereaved families' perceptions of the quality of end-of-life communication among Veterans, families and staff in Veterans Affairs (VA) medical centers during the COVID-19 pandemic. DESIGN: Qualitative descriptive study using data from a survey of bereaved family members of Veterans administered from March-June 2020. Data were analyzed using qualitative content analysis. SETTING: VA medical centers with the highest numbers of COVID-19 cases during the study period. PARTICIPANTS: Next-of-kin of 328 Veterans who died in one of 37 VA medical centers' acute care, intensive care, nursing home, or hospice units. MEASUREMENTS: Open-ended survey questions (response rate = 37%) about family member's perceptions of: (1) communication with the healthcare team about the patient, (2) communication with the patient, and (3) use of remote communication technologies. RESULTS: Bereaved family members identified contextual factors perceived to impact communication quality including: allowing family at the bedside when death is imminent, fears that the patient died alone, and overall perceptions of VA care. Characteristics of perceived high-quality communication included staff availability for remote communication and being kept informed of the patient's condition and plan of care. Low-quality communication with staff was perceived to result from limited access to staff, insufficient updates regarding the patient's condition, and when the family member was not consulted about care decision-making. Communication quality with the patient was facilitated or impeded by the availability and use of video-enabled remote technologies. CONCLUSION: Communication between patients, families, and healthcare teams at the end of life remains critically important during times of limited in-person visitation. Families report that low-quality communication causes profound distress that can affect the quality of dying and bereavement. Innovative strategies are needed to ensure that high-quality communication occurs despite pandemic-related visitation restrictions.

A National Study of End-of-Life Care among Older Veterans with Hearing and Vision Loss.

OBJECTIVES: Hearing and visual sensory loss is prevalent among older adults and may impact the quality of healthcare they receive. Few studies have examined sensory loss and end-of-life (EOL) care quality. Our aim was to describe hearing and vision loss and their associations with the quality of EOL care and family perception of care in the last 30 days of life among a national sample of veteran decedents. DESIGN: Retrospective medical record review and Bereaved Family Survey (BFS). SETTING: Veterans Affairs (VA) Medical Centers (N = 145). PARTICIPANTS: Medical record review of all veterans who died in an inpatient VA Medical Center between October 2012 and September 2017 (N = 96 424). Survey results included 42 428 individuals. MEASUREMENTS: Three indicators of high-quality EOL care were measured: palliative consultation in the last 90 days of life, death in a non-acute setting, and contact with a chaplain. The BFS reflects a global evaluation of quality of EOL care; pain and posttraumatic stress disorder management; and three subscales characterizing perceptions regarding communication, emotional and spiritual support, and information about death benefits in the last month of life. RESULTS: In adjusted models, EOL care quality indicators and BFS outcomes for veterans with hearing loss were similar to those for veterans without hearing loss; however, we noted slightly lower scores for pain management and less satisfaction with communication. Veterans with vision loss were less likely to have received a palliative care consult or contact with a chaplain than those without vision loss. Although BFS respondents for veterans with vision loss were less likely than respondents for veterans without vision loss to report excellent overall care and satisfaction with emotional support, other outcomes did not differ. CONCLUSION: In general, the VA is meeting the EOL care needs of veterans with hearing and vision loss through palliative care practices. J Am Geriatr Soc 68:817-825, 2020.

Phospholipase A2 activity is associated with structural brain changes in schizophrenia.

Regional structural brain changes are among the most robust biological findings in schizophrenia, yet the underlying pathophysiological changes remain poorly understood. Recent evidence suggests that abnormal neuronal/dendritic plasticity is related to alterations in membrane lipids. We examined whether serum activity of membrane lipid remodelling/repairing cytosolic phospholipase A(2) (PLA(2)) were related to regional brain structure in magnetic resonance images (MRI). The study involved 24 schizophrenia patients, who were either drug-naïve or off antipsychotic medication, and 25 healthy controls. Using voxel-based morphometry (VBM) analysis of T1-high-resolution MRI-images, we correlated both gray matter and white matter changes with serum PLA(2)-activity. PLA(2) activity was increased in patients, consistent with previous findings. VBM group comparison of patients vs. controls showed abnormalities of frontal and medial temporal cortices/hippocampus, and left middle/superior temporal gyrus in first-episode patients. Group comparison of VBM/PLA(2)-correlations revealed a distinct pattern of disease-related interactions between gray/white matter changes in patients and PLA(2)-activity: in first-episode patients (n=13), PLA(2)-activity was associated with structural alterations in the left prefrontal cortex and the bilateral thalamus. Recurrent-episode patients (n=11) showed a wide-spread pattern of associations between PLA(2)-activity and structural changes in the left (less right) prefrontal and inferior parietal cortex, the left (less right) thalamus and caudate nucleus, the left medial temporal and orbitofrontal cortex and anterior cingulum, and the cerebellum. Our findings demonstrate a potential association between membrane lipid biochemistry and focal brain structural abnormalities in schizophrenia. Differential patterns in first-episode vs. chronic patients might be related to PLA(2)-increase at disease-onset reflecting localized regenerative activity, whereas correlations in recurrent-episode patients might point to less specific neurodegenerative aspects of disease progression.

Substrate specificity and novel selective inhibitors of TNF-alpha converting enzyme (TACE) from two-dimensional substrate mapping.

We report a systematic analysis of the P1' and P2' substrate specificity of TNF-alpha converting enzyme (TACE) using a peptide library and a novel analytical method, and we use the substrate specificity information to design novel reverse hydroxamate inhibitors. Initial truncation studies, using the amino acid sequence around the cleavage site in precursor-TNF-alpha, showed that good turnover was obtained with the peptide DNP-LAQAVRSS-NH2. Based on this result, 1000 different peptide substrates of the form Biotin-LAQA-P1'-P2'-SSK(DNP)-NH2 were prepared, with 50 different natural and unnatural amino acids at P1' in combination with 20 different amino acids at P2'. The peptides were pooled, treated with purified microsomal TACE, and the reaction mixtures were passed over a streptavidin affinity column to remove unreacted substrate and the N-terminal biotinylated product. C-terminal cleavage products not binding to streptavidin were subjected to liquid chromatography/mass spectrometry analysis where individual products were identified and semiquantitated. 25 of the substrates were resynthesized as discrete peptides and assayed with recombinant TACE. The experiments show that recombinant TACE prefers lipophilic amino acids at the P1' position, such as phenylglycine, homophenylalanine, leucine and valine. At the P2' position, TACE can accommodate basic amino acids, such as arginine and lysine, as well as certain non-basic amino acids such as citrulline, methionine sulfoxide and threonine. These substrate preferences were used in the design of novel reverse hydroxamate TACE inhibitors with phenethyl and 5-methyl-thiophene-methyl side-chains at P1', and threonine and nitro-arginine at P2'.

Increased calcium-independent phospholipase A2 activity in first but not in multiepisode chronic schizophrenia.

BACKGROUND: Increased activity of calcium independent phospholipase A2 (iPLA2) has repeatedly been found in the serum of unmedicated first-episode schizophrenia patients and assumed to reflect a pertubation of phospholipid metabolism. Previous studies in chronic schizophrenia were less conclusive. To explore whether iPLA2 changes are stage dependent, we investigated serum iPLA2 activity in various stages of schizophrenia. METHODS: iPLA2 activity was assessed in the serum of 30 first-episode and 23 multiepisode schizophrenia patients and 53 healthy control subjects matched for age and gender. A fluorimetric assay was applied using the PLA2 specific substrate NBDC6-HPC, thin-layer chromatography of reaction products, and digital image scanning for signal detection. RESULTS: Group comparison between first-episode and multiepisode patients and corresponding control groups revealed significantly increased iPLA2 activity only in first-episode patients. Enzyme activity in first-episode patients was also markedly increased, compared with chronic patients. iPLA2 changes observed were irrespective of neuroleptic medication, age, or gender. CONCLUSIONS: Our results suggest increased lipid turnover in the acute early phase of schizophrenia that is less obvious in chronic stages. Future longitudinal studies involving iPLA2 activity and phosphorous magnetic resonance spectroscopy need to address the relation between perturbed brain lipid metabolism and iPLA2 increment in the course of schizophrenia.

Fluorometric assays of phospholipase A2 activity with three different substrates in biological samples of patients with schizophrenia.

The rationale of this study was to understand the complexity of kinetics of fluorogenic phospholipid substrates as well as contradictory findings of clinical papers measuring phospholipase A2 (PLA2) activity using different methodologies. The aim was to recommend to clinicians and researchers what substrate in conjunction with what assay should be used. Two methods, (i) continuous fluorometric assay and (ii) high performance thin layer chromatography (HPTLC) on microplates combined with quantitative image scanning, were studied with three different substrates (bis-BODIPY FL C11-PC, NBDC6-HPC, PED6). The study demonstrates that NBD-PC is not a suitable substrate to measure PLA2 activity using a spectrofluorometer. On the other hand, NBD-PC gives the highest and most reproducible integrated light intensities (ILls) in HPTLC studies. Slow time-dependent increases in fluorescence intensities recorded with biological samples in fluorometers, but not caused by substrate splitting, had to be classified as "perturbation kinetics". PLA2 activities in blood samples of 26 unmedicated schizophrenia patients and 26 age-matched healthy controls were measured by the spectrofluorometric method and then compared with the activity data obtained with the HPTLC method. A significant group difference was found only with the HPTLC. In order to get more reliable results, we recommend that clinicians and researchers use NBD-phosphatidylcholines as PLA2 substrates in biological samples and start with an analytical separation of reaction products followed by image analysis of the fluorescent spots.