| 1. |
- Bentley, Michael J., et al.
(author)
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A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
- 2014
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In: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 100, s. 1-9
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Journal article (peer-reviewed)abstract
- A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.
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| 2. |
- Gustafsson, Charlotte Eklund, et al.
(author)
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Prognostic value of peak work rate indexed by left ventricular diameter
- 2023
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In: Scientific Reports. - : NATURE PORTFOLIO. - 2045-2322. ; 13:1
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Journal article (peer-reviewed)abstract
- Left ventricular diameter (LVEDD) increases with systematic endurance training but also in various cardiac diseases. High exercise capacity associates with favorable outcomes. We hypothesized that peak work rate (W-peak) indexed to LVEDD would carry prognostic information and aimed to evaluate the association between W-peak/LVEDDrest and cardiovascular mortality. W-peak/LVEDDrest (W/mm) was calculated in patients with an echocardiographic examination within 3 months of a maximal cycle ergometer exercise test. Low W-peak/LVEDDrest was defined as a value below the sex- and age-specific 5th percentile among lower-risk subjects. The association with cardiovascular mortality was evaluated using Cox regression. In total, 3083 patients were included (8.0 [5.4-11.1] years of follow-up, 249 (8%) cardiovascular deaths). W-peak/LVEDDrest (W/mm) was associated with cardiovascular mortality (adjusted hazard ratio (HR) 0.28 [0.22-0.36]), similar to W-peak in % of predicted, with identical prognostic strength when adjusted for age and sex (C-statistics 0.87 for both). A combination of low W-peak/LVEDDrest and low W-peak was associated with a particularly poor prognosis (adjusted HR 6.4 [4.0-10.3]). W-peak/LVEDDrest was associated with cardiovascular mortality but did not provide incremental prognostic value to W-peak alone. The combination of a low W-peak/LVEDDrest and low W-peak was associated with a particularly poor prognosis.
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| 3. |
- Kozlikova, B., et al.
(author)
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Visualization of Biomolecular Structures: State of the Art Revisited
- 2017
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In: Computer graphics forum (Print). - : WILEY. - 0167-7055 .- 1467-8659. ; 36:8, s. 178-204
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Journal article (peer-reviewed)abstract
- Structural properties of molecules are of primary concern in many fields. This report provides a comprehensive overview on techniques that have been developed in the fields of molecular graphics and visualization with a focus on applications in structural biology. The field heavily relies on computerized geometric and visual representations of three-dimensional, complex, large and time-varying molecular structures. The report presents a taxonomy that demonstrates which areas of molecular visualization have already been extensively investigated and where the field is currently heading. It discusses visualizations for molecular structures, strategies for efficient display regarding image quality and frame rate, covers different aspects of level of detail and reviews visualizations illustrating the dynamic aspects of molecular simulation data. The survey concludes with an outlook on promising and important research topics to foster further success in the development of tools that help to reveal molecular secrets.
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| 4. |
- Kozlíková, Barbora, et al.
(author)
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Visualization of Molecular Structure: The State of the Art
- 2015
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In: Eurographics Conference on Visualization (EuroVis) - STARs. - : Eurographics - European Association for Computer Graphics.
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Conference paper (peer-reviewed)abstract
- Structural properties of molecules are of primary concern in many fields. This report provides a comprehensive overview on techniques that have been developed in the fields of molecular graphics and visualization with a focus on applications in structural biology. The field heavily relies on computerized geometric and visual representations of three-dimensional, complex, large, and time-varying molecular structures. The report presents a taxonomy that demonstrates which areas of molecular visualization have already been extensively investigated and where the field is currently heading. It discusses visualizations for molecular structures, strategies for efficient display regarding image quality and frame rate, covers different aspects of level of detail, and reviews visualizations illustrating the dynamic aspects of molecular simulation data. The report concludes with an outlook on promising and important research topics to enable further success in advancing the knowledge about interaction of molecular structures.
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| 5. |
- Larter, Robert D., et al.
(author)
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Reconstruction of changes in the Amundsen Sea and BellingshausenSea sector of the West Antarctic Ice Sheet since the Last GlacialMaximum
- 2013
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In: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 100, s. 56-86
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Journal article (other academic/artistic)abstract
- Marine and terrestrial geological and marine geophysical data that constrain deglaciation since the LastGlacial Maximum (LGM) of the sector of theWest Antarctic Ice Sheet (WAIS) draining into the AmundsenSea and Bellingshausen Sea have been collated and used as the basis for a set of time-slice reconstructions.The drainage basins in these sectors constitute a little more than one-quarter of the area ofthe WAIS, but account for about one-third of its surface accumulation. Their mass balance is becomingincreasingly negative, and therefore they account for an even larger fraction of currentWAIS discharge. Ifall of the ice in these sectors of the WAIS were discharged to the ocean, global sea level would rise byca 2 m.There is compelling evidence that grounding lines of palaeo-ice streams were at, or close to, thecontinental shelf edge along the Amundsen Sea and Bellingshausen Sea margins during the last glacialperiod. However, the few cosmogenic surface exposure ages and ice core data available from the interiorofWest Antarctica indicate that ice surface elevations there have changed little since the LGM. In the fewareas from which cosmogenic surface exposure ages have been determined near the margin of the icesheet, they generally suggest that there has been a gradual decrease in ice surface elevation since pre-Holocene times. Radiocarbon dates from glacimarine and the earliest seasonally open marine sedimentsin continental shelf cores that have been interpreted as providing approximate ages for post-LGMgrounding-line retreat indicate different trajectories of palaeo-ice stream recession in the Amundsen Seaand Bellingshausen Sea embayments. The areas were probably subject to similar oceanic, atmosphericand eustatic forcing, in which case the differences are probably largely a consequence of how topographicand geological factors have affected ice flow, and of topographic influences on snow accumulation andwarm water inflow across the continental shelf.Pauses in ice retreat are recorded where there are “bottle necks” in cross-shelf troughs in both embayments.The highest retreat rates presently constrained by radiocarbon dates from sediment cores arefound where the grounding line retreated across deep basins on the inner shelf in the Amundsen Sea,which is consistent with the marine ice sheet instability hypothesis. Deglacial ages from the Amundsen Sea Embayment (ASE) and Eltanin Bay (southern Bellingshausen Sea) indicate that the ice sheet hadalready retreated close to its modern limits by early Holocene time, which suggests that the rapid icethinning, flow acceleration, and grounding line retreat observed in this sector over recent decades areunusual in the context of the past 10,000 years.
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| 6. |
- Lindow, Martin, et al.
(author)
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Strategies for the Prevention of Violence in Institutional Care : A Qualitative Interview Study With Ward Managers
- 2022
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In: Frontiers in Psychiatry. - : Frontiers Media S.A.. - 1664-0640. ; 13
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Journal article (peer-reviewed)abstract
- Background: The presence of violence within psychiatric and residential settings remains a challenge. Research on this problem has often focused on describing violence prevention strategies from either staffs' or service users' perspectives, and the views of ward managers has been largely overlooked. The aim of the present study was therefore to identify ward managers' strategies to prevent violence in institutional care, focusing on safety and values.Methods: Data were collected using semi-structured interviews with 12 ward managers who headed four different types of psychiatric wards and two special residential homes for adolescents. Qualitative content analysis was applied, first using a deductive approach, in which quotes were selected within a frame of primary, secondary, and tertiary prevention, then by coding using an inductive approach to create themes and subthemes.Results: Ward managers' strategies were divided into the four following themes: (1) Balancing being an active manager with relying on staff's abilities to carry out their work properly while staying mostly in the background; (2) Promoting value awareness and non-coercive practices in encounters with service users by promoting key values and adopting de-escalation techniques, as well as focusing on staff-service user relationships; (3) Acknowledging and strengthening staff's abilities and competence by viewing and treating staff as a critical resource for good care; and (4) Providing information and support to staff by exchanging information and debriefing them after violent incidents.Conclusions: Ward managers described ethical challenges surrounding violence and coercive measures. These were often described as practical problems, so there seems to be a need for a development of higher ethical awareness based on a common understanding regarding central ethical values to be respected in coercive care. The ward managers seem to have a high awareness of de-escalation and the work with secondary prevention, however, there is a need to develop the work with primary and tertiary prevention. The service user group or user organizations were not considered as resources in violence prevention, so there is a need to ensure that all stakeholders are active in the process of creating violence prevention strategies.
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| 7. |
- Lindow, Thomas, et al.
(author)
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Echocardiographic estimation of pulmonary artery wedge pressure : invasive derivation, validation, and prognostic association beyond diastolic dysfunction grading
- 2024
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In: European Heart Journal Cardiovascular Imaging. - : Oxford University Press. - 2047-2404 .- 2047-2412. ; 25:4, s. 498-509
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Journal article (peer-reviewed)abstract
- Background and aims: Grading of diastolic function can be useful, but indeterminate classifications are common.Objectives: We aimed to invasively derive and validate a quantitative echocardiographic estimation of pulmonary artery wedge pressure (PAWP), and to compare its prognostic performance to diastolic dysfunction grading.Methods: Echocardiographic measures were used to derive an estimated PAWP (ePAWP) using multivariable linear regression in patients undergoing right heart catheterization (RHC). Prognostic associations were analyzed in the National Echocardiography Database of Australia (NEDA).Results: In patients who had undergone both RHC and echocardiography within two hours (n=90), ePAWP was derived using left atrial volume index, mitral peak early velocity (E), and pulmonary vein systolic velocity (S). In a separate external validation cohort (n=53, simultaneous echocardiography and RHC), ePAWP showed good agreement with invasive PAWP (mean±SD difference 0.5±5.0 mmHg) and good diagnostic accuracy for estimating PAWP>15mmHg (area under the curve [95% confidence interval] 0.94 [0.88-1.00]). Among patients in NEDA (n=38,856, median [interquartile range] follow-up 4.8 [2.3-8.0] years, 2,756 cardiovascular deaths), ePAWP was associated with cardiovascular death even after adjustment for age, sex, and diastolic dysfunction grading (hazard ratio (HR) 1.08 [1.07-1.09] per mmHg) and provided incremental prognostic information to diastolic dysfunction grading (improved C-statistic from 0.65 to 0.68, p<0.001). Increased ePAWP was associated with worse prognosis across all grades of diastolic function (HR normal: 1.07 [1.06-1.09]; indeterminate: 1.08 [1.07-1.09]; abnormal: 1.08 [1.07-1.09], p<0.001 for all).Conclusions: Echocardiographic ePAWP is an easily acquired continuous variable with good accuracy that associates with prognosis beyond diastolic dysfunction grading.
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| 8. |
- Lindow, Thomas, et al.
(author)
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Heart age estimated using explainable advanced electrocardiography
- 2022
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 12:1
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Journal article (peer-reviewed)abstract
- Electrocardiographic (ECG) Heart Age conveying cardiovascular risk has been estimated by both Bayesian and artificial intelligence approaches. We hypothesised that explainable measures from the 10-s 12-lead ECG could successfully predict Bayesian 5-min ECG Heart Age. Advanced analysis was performed on ECGs from healthy subjects and patients with cardiovascular risk or proven heart disease. Regression models were used to predict patients’ Bayesian 5-min ECG Heart Ages from their standard, resting 10-s 12-lead ECGs. The difference between 5-min and 10-s ECG Heart Ages were analyzed, as were the differences between 10-s ECG Heart Age and the chronological age (the Heart Age Gap). In total, 2,771 subjects were included (n = 1682 healthy volunteers, n = 305 with cardiovascular risk factors, n = 784 with cardiovascular disease). Overall, 10-s Heart Age showed strong agreement with the 5-min Heart Age (R2 = 0.94, p < 0.001, mean ± SD bias 0.0 ± 5.1 years). The Heart Age Gap was 0.0 ± 5.7 years in healthy individuals, 7.4 ± 7.3 years in subjects with cardiovascular risk factors (p < 0.001), and 14.3 ± 9.2 years in patients with cardiovascular disease (p < 0.001). Heart Age can be accurately estimated from a 10-s 12-lead ECG in a transparent and explainable fashion based on known ECG measures, without deep neural network-type artificial intelligence techniques. The Heart Age Gap increases markedly with cardiovascular risk and disease.
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| 9. |
- Lindow, Thomas, et al.
(author)
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Heart age gap estimated by explainable advanced electrocardiography is associated with cardiovascular risk factors and survival
- 2023
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In: The European Heart Journal - Digital Health. - : Oxford University Press. - 2634-3916. ; 4:5, s. 384-392
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Journal article (peer-reviewed)abstract
- AimsDeep neural network artificial intelligence (DNN-AI)-based Heart Age estimations have been presented and used to show that the difference between an electrocardiogram (ECG)-estimated Heart Age and chronological age is associated with prognosis. An accurate ECG Heart Age, without DNNs, has been developed using explainable advanced ECG (A-ECG) methods. We aimed to evaluate the prognostic value of the explainable A-ECG Heart Age and compare its performance to a DNN-AI Heart Age.Methods and resultsBoth A-ECG and DNN-AI Heart Age were applied to patients who had undergone clinical cardiovascular magnetic resonance imaging. The association between A-ECG or DNN-AI Heart Age Gap and cardiovascular risk factors was evaluated using logistic regression. The association between Heart Age Gaps and death or heart failure (HF) hospitalization was evaluated using Cox regression adjusted for clinical covariates/comorbidities. Among patients [n = 731, 103 (14.1%) deaths, 52 (7.1%) HF hospitalizations, median (interquartile range) follow-up 5.7 (4.7-6.7) years], A-ECG Heart Age Gap was associated with risk factors and outcomes [unadjusted hazard ratio (HR) (95% confidence interval) (5 year increments): 1.23 (1.13-1.34) and adjusted HR 1.11 (1.01-1.22)]. DNN-AI Heart Age Gap was associated with risk factors and outcomes after adjustments [HR (5 year increments): 1.11 (1.01-1.21)], but not in unadjusted analyses [HR 1.00 (0.93-1.08)], making it less easily applicable in clinical practice.ConclusionA-ECG Heart Age Gap is associated with cardiovascular risk factors and HF hospitalization or death. Explainable A-ECG Heart Age Gap has the potential for improving clinical adoption and prognostic performance compared with existing DNN-AI-type methods. Graphical Abstract
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| 10. |
- Lindow, Thomas, et al.
(author)
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Noninvasive Imaging Methods for Quantification of Pulmonary Edema and Congestion : A Systematic Review
- 2023
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In: JACC: Cardiovascular Imaging. - 1936-878X .- 1876-7591. ; 16:11, s. 1469-1484
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Research review (peer-reviewed)abstract
- Quantification of pulmonary edema and congestion is important to guide diagnosis and risk stratification, and to objectively evaluate new therapies in heart failure. Herein, we review the validation, diagnostic performance, and clinical utility of noninvasive imaging modalities in this setting, including chest x-ray, lung ultrasound (LUS), computed tomography (CT), nuclear medicine imaging methods (positron emission tomography [PET], single photon emission CT), and magnetic resonance imaging (MRI). LUS is a clinically useful bedside modality, and fully quantitative methods (CT, MRI, PET) are likely to be important contributors to a more accurate and precise evaluation of new heart failure therapies and for clinical use in conjunction with cardiac imaging. There are only a limited number of studies evaluating pulmonary congestion during stress. Taken together, noninvasive imaging of pulmonary congestion provides utility for both clinical and research assessment, and continued refinement of methodologic accuracy, validation, and workflow has the potential to increase broader clinical adoption.
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