The longitudinal behavioral effects of acute exposure to galactic cosmic radiation in female C57BL/6J mice: implications for deep space missions, female crews, and potential antioxidant countermeasures

Galactic cosmic radiation (GCR) is an unavoidable risk to astronauts that may affect mission success. Male rodents exposed to 33-beam-GCR (33-GCR) show short-term cognitive deficits but reports on female rodents and long-term assessment is lacking. Here we asked: What are the longitudinal behavioral effects of 33-GCR on female mice? Also, can an antioxidant/anti-inflammatory compound mitigate the impact of 33-GCR? Mature (6-month-old) C57BL/6J female mice received the antioxidant CDDO-EA (400 µg/g of food) or a control diet (vehicle, Veh) for 5 days and either Sham-irradiation (IRR) or whole-body 33-GCR (0.75Gy) on the 4th day. Three-months post-IRR, mice underwent two touchscreen-platform tests: 1) location discrimination reversal (which tests behavior pattern separation and cognitive flexibility, two abilities reliant on the dentate gyrus) and 2) stimulus-response learning/extinction. Mice then underwent arena-based behavior tests (e.g. open field, 3-chamber social interaction). At the experiment end (14.25-month post-IRR), neurogenesis was assessed (doublecortin-immunoreactive [DCX+] dentate gyrus neurons). Female mice exposed to Veh/Sham vs. Veh/33-GCR had similar pattern separation (% correct to 1st reversal). There were two effects of diet: CDDO-EA/Sham and CDDO-EA/33-GCR mice had better pattern separation vs. their respective control groups (Veh/Sham, Veh/33-GCR), and CDDO-EA/33-GCR mice had better cognitive flexibility (reversal number) vs. Veh/33-GCR mice. Notably, one radiation effect/CDDO-EA countereffect also emerged: Veh/33-GCR mice had worse stimulus-response learning (days to completion) vs. all other groups, including CDDO-EA/33-GCR mice. In general, all mice show normal anxiety-like behavior, exploration, and habituation to novel environments. There was also a change in neurogenesis: Veh/33-GCR mice had fewer DCX+ dentate gyrus immature neurons vs. Veh/Sham mice. Our study implies space radiation is a risk to a female crew's longitudinal mission-relevant cognitive processes and CDDO-EA is a potential dietary countermeasure for space-radiation CNS risks.

Clinical suspicion, diagnosis and management of cardiac amyloidosis: update document and executive summary

In recent years, the interest in cardiac amyloidosis has grown exponentially. However, there is a need to improve our understanding of amyloidosis in order to optimise early detection systems. Therefore, it is crucial to incorporate solutions to improve the suspicion, diagnosis and follow-up of cardiac amyloidosis. In this sense, we designed a tool following the different phases to reach the diagnosis of cardiac amyloidosis, as well as an optimal follow-up: a) clinical suspicion, where the importance of the "red flags" to suspect it and activate the diagnostic process is highlighted; 2) diagnosis, where the diagnostic algorithm is mainly outlined; and 3) follow-up of confirmed patients. This is a practical resource that will be of great use to all professionals caring for patients with suspected or confirmed cardiac amyloidosis, to improve its early detection, as well as to optimise its accurate diagnosis and optimal follow-up.

Deep Learning of Time-Signal Intensity Curves from Dynamic Susceptibility Contrast Imaging Enables Tissue Labeling and Prediction of Survival in Glioblastoma

BACKGROUND AND PURPOSE

An autoencoder can learn representative time-signal intensity patterns to provide tissue heterogeneity measures using dynamic susceptibility contrast MR imaging. The aim of this study was to investigate whether such an autoencoder-based pattern analysis could provide interpretable tissue labeling and prognostic value in isocitrate dehydrogenase (IDH) wild-type glioblastoma.

MATERIALS AND METHODS

Preoperative dynamic susceptibility contrast MR images were obtained from 272 patients with IDH wild-type glioblastoma (training and validation, 183 and 89 patients, respectively). The autoencoder was applied to the dynamic susceptibility contrast MR imaging time-signal intensity curves of tumor and peritumoral areas. Representative perfusion patterns were defined by voxelwise K-means clustering using autoencoder latent features. Perfusion patterns were labeled by comparing parameters with anatomic reference tissues for baseline, signal drop, and percentage recovery. In the validation set (n = 89), a survival model was created from representative patterns and clinical predictors using Cox proportional hazard regression analysis, and its performance was calculated using the Harrell C-index.

RESULTS

Eighty-nine patients were enrolled. Five representative perfusion patterns were used to characterize tissues as high angiogenic tumor, low angiogenic/cellular tumor, perinecrotic lesion, infiltrated edema, and vasogenic edema. Of these, the low angiogenic/cellular tumor (hazard ratio, 2.18; P = .047) and infiltrated edema patterns (hazard ratio, 1.88; P = .009) in peritumoral areas showed significant prognostic value. The combined perfusion patterns and clinical predictors (C-index, 0.72) improved prognostication when added to clinical predictors (C-index, 0.55).

CONCLUSIONS

The autoencoder perfusion pattern analysis enabled tissue characterization of peritumoral areas, providing heterogeneity and dynamic information that may provide useful prognostic information in IDH wild-type glioblastoma.

Factors associated to renin-angiotensin-aldosterone system inhibitors discontinuation or down-titration due to hyperkalaemia in patients with chronic cardiovascular conditions

Background/Introduction

The renin-angiotensin-aldosterone system inhibitors (RAASI) are one of the keystones of the medical treatment in chronic cardiovascular disorders and have shown improvements in clinical outcomes in many clinical trials. Hyperkalaemia is a well-defined non-desirable effect of RAASI that occasionally forces to interrupt these medications. That enforced RAASI discontinuation or down-titration due to hyperkalaemia may have adverse prognostic consequences.

Purpose

Describe the demographical, clinical and pharmacological variables associated to a higher risk of RAASI discontinuation or down-titration due to hyperkalaemia among individuals with chronic cardiovascular conditions.

Methods

We used data from more than 375,000 individuals 55 years of age or older, included in the population-based healthcare database of a public Institute of Health between 2015 and 2017. We included participants with at least one relevant condition: chronic heart failure, chronic kidney disease, diabetes mellitus, ischemic heart disease or hypertension. They had to be under RAASI treatment as of January 1st, 2016, and with evidence of at least one episode of hyperkalaemia (serum potassium >5.0 mmol/L) during 2016. Then, were classified in one of the two following profiles: RAASI treatment discontinuation or down-titration versus RAASI treatment unchanged or up-titrated. For the statistical analysis, we used logistic regression to calculate the multivariable-adjusted odds ratios of each study variable, comparing RAASI discontinuation or down-titration group to RAASI treatment unchanged or up-titrated controls (reference group).

Results

In the multivariable-adjusted model, the risk of RAASI treatment discontinuation or down-titration due to hyperkalaemia was significantly associated with the use of RAASI, very high comorbidity index, potassium derangements (both hypokalaemia and hyperkalaemia), prior hospitalizations and prior emergency visits. Among RAASI treatments, the use of Angiotensin receptor blockers (OR 2.518, 95% CI 2.317–2.735) and Angiotensin-converting enzyme inhibitors (OR 2.341, 95% CI 2.149–2.549) were associated with a higher risk of RAASI discontinuation or down-titration due to hyperkalaemia than Aldosterone inhibitors (1.428, 95% CI 1.285–1.584).

Conclusion

These results suggest that vulnerable populations such as those with very high comorbidity index, potassium derangements or prior emergency visits or hospitalizations have a higher risk of RAASI treatment discontinuation or down-titration due to hyperkalaemia.

A more careful and exhaustive management of RAASI should be advised in those patients.

Funding Acknowledgement

Type of funding sources: Private grant(s) and/or Sponsorship. Main funding source(s): Josep Comin-Colet has received speaker fees from Vifor Pharma.

Management of renin-angiotensin-aldosterone system inhibitors in patients with chronic cardiovascular conditions and its association with clinical outcomes

Background

In chronic cardiovascular diseases, the renin-angiotensin-aldosterone system inhibitors (RAASI) are one of the keystones of the medical treatment and have revealed improvements in clinical outcomes in many clinical trials. In contrast, is well defined as non-desirable effect of RAASI the development of hyperkalemia, which could force to interrupt these treatments. Hyperkalemia has been associated with worse outcomes in observational studies. Though, it is controversial if those negative outcomes in hyperkalemic patients could be because the potassium derangement itself or the circumstance that in these individuals could be enforced to discontinue RAASI medications with prognostic consequences at mid- to long-term.

Purpose

Assess associations between management of RAASI and clinical outcomes among individuals with chronic cardiovascular conditions and hyperkalemia.

Methods

Data from more than 375,000 individuals 55 years of age or older were analyzed, in a population-based healthcare database of a public Institute of Health between 2015 and 2017. We conducted a longitudinal analysis, in which participants with at least one relevant condition were included: chronic heart failure, chronic kidney disease, diabetes mellitus, ischemic heart disease or hypertension. They had to be under RAASI treatment as of January 1st, 2016, and with evidence of at least one episode of hyperkalemia (serum potassium >5.0 mmol/L) during 2016. Then, were classified in one of the two following profiles: RAASI treatment discontinuation or down-titration versus RAASI treatment unchanged or up-titrated. Subsequently, all-cause death and hospitalization has been assessed in the follow-up period as clinical outcomes. For the statistical analysis, we calculated unadjusted incidence rate ratios and Cox Proportional Hazards Regression models to calculate the multivariable-adjusted risk ratios for the clinical endpoints comparing both groups.

Results

There was found an association with mortality and hospitalization for the RAASI treatment interruption/down-titration group when compared unadjusted incidence rate ratios of each clinical endpoints to RAASI treatment unchanged patients (reference group). We presented these results in a Kaplan-Meier survivor curves for endpoint mortality (Figure 1). In the multivariable-adjusted model, the risk of mortality and hospitalization was associated mainly with older age, hypokalemia and down-titration of RAASI treatments, achieving statistical significance (Table 1). The risk ratio for mortality associated with down-titration and with hyperkalemia compared with the reference group was 1.676 (95% CI 1.54–1.82) and 1.161 (95% CI 1.07–1.26) respectively.

Conclusion

These results suggest that the worse outcomes in hyperkalemia individuals could be influenced more for the discontinuation of RAASI prognostic drugs then for the hyperkalemia itself. It is necessary clinical randomized trials to confirm this observational hypothesis.

Funding Acknowledgement

Type of funding sources: Private grant(s) and/or Sponsorship. Main funding source(s): Josep Comin-Colet has received speaker fees from Vifor Pharma

Effect on mortality and hospitalization of real-world implementation of transitional care heart failure programmes in patients with heart failure: a population-based study in 77,554 patients

Background

The efficacy of heart failure programs has been demonstrated in clinical trials but their applicability in the real-world practice setting is more controversial.

Purpose

This study evaluates the efficacy of a comprehensive, transitional-care nurse-based HF programme integrating hospital and primary care resources in a healthcare area covering a population of 209,255 (implementation area).

Methods

We designed a pragmatic, population-based evaluation of the implementation of the program conducting a natural experiment. Study periods were: pre-implementation period (years 2015 and 2016), transition period (year 2017) and consolidation of implementation period (years 2018 and 2019). For the purposes of this study, we included all individuals consecutively admitted to hospital with at least one ICD-9-CM code for HF as the primary diagnosis and discharged alive in Catalonia between January, the 1st, 2015 and December, the 31st of 2019. Efficacy of the implementation of the program was measured at two levels: first, comparing the outcomes of patients exposed to the HF program between periods of implementation taking 2015–2016 as the reference period and, second, comparing outcomes between patients of the implementation area with patients of the remaining areas of the Catalonia at each predefined period.

Results

We included 77,554 patients in the study: 3,396 exposed to the implementation area and 74,158 exposed to the rest of healthcare areas in Catalonia. During the period of the study, 55,886 (72.1%) patients experienced at least one major adverse event. Death occurred in 37,469 (48.3%), clinically related hospitalisation in 41,709 (53.8%) and HF readmission in 29,755 (38.4%).

As shown in Table 1, multivariate Cox proportional hazards models adjusted for age, gender, previous hospitalisation, co-morbidities, socioeconomic status, and time since HF diagnosis showed there was a significant (all p-values <0.001) relative risk reduction of the risk of all-cause death (5%), clinically related hospitalisation (13%) and HF hospitalisation (14%) in the consolidation period (2018–2019) compared to the pre-programme period (2015–2016). Similarly, as shown in Table 1 and Figure 1, while in the pre-programme period (2015–2016) the risk of adverse outcomes was significantly higher in patients exposed to the implementation area compared to the rest of Catalonia, this association was inverted during the consolidation period (2018–2019) where the risk of mortality, clinically-related readmission and HF re-hospitalisation was significantly reduced (all p-values <0.025) by 19%, 11% and 16%, respectively, among patients exposed to the implementation area compared with patients of the remaining areas of Catalonia.

Conclusions

The implementation of multidisciplinary transitional-care nurse-based heart failure programmes integrating hospital and primary care reduce mortality and hospitalisation in vulnerable patients with heart-failure.

Funding Acknowledgement

Type of funding sources: None.

Effect of socioeconomic status in medical resource use and outcomes in patients with heart failure in integrated care settings: real-world evidence from population-based data of 77,554 patients

Background

Low socioeconomic status (SES) has a negative impact in terms of outcomes and medical resource use despite open access to care in universal health-care systems in patients with heart failure (HF). Whether the breach in outcomes determined by SES inequalities can be mitigated by intensive HF management in integrate care programs is not known.

Purpose

To analyse the effect of SES status on health outcomes before and after a pragmatic implementation of an intensive transitional care nurse-based HF management program integrating hospital and primary care and resources for patients with HF at a high risk of events in a health-care area of 209,255 inhabitants.

Methods

For the purposes of this study, we included all individuals consecutively admitted to hospital with at least one ICD-9-CM code for HF as the primary diagnosis and discharged alive in Catalonia between January, the 1st, 2015 and December, the 31st of 2019. We considered 3 distinct periods of implementation of the HF programme: pre-implementation (2015–2016), transition (2017 start of implementation) and consolidation (2018–2019). To evaluate the efficacy of the programme according to SES strata, we compared outcomes between HF patients of the implementation area and HF patients of the remaining healthcare areas of Catalonia across implementation periods and stratified according to levels of SES. SES was defined based on individual annual income.

Results

We included 77,554 patients in the study: 3,396 in the implementation area and 74, 158 in the rest of Catalonia. Distribution of patients according to SES was: 12,018 (15.5%) high or medium SES, 61,967 (79.9%) low SES and 3,535 (4.5%) very low SES. During the period of the study death occurred in 37,469 (48.3%), clinically related hospitalisation in 41,709 (53.8%) and HF readmission in 29,755 (38.4%).

Multivariate Cox proportional hazards models (Table 1) showed that low or very low SES was associated with worse outcomes compared to patients with high or medium SES. Implementation of HF programme significantly improved outcomes in patients with HF (Figure 1, left column). As shown in Figure 1 central and right columns, improvement in clinical outcomes was observed across all SES strata in patients exposed to the HF programme. The size effect for hospitalisation was more prominent among patients with medium of high SES (47% relative change) compared to patients with low or very low SES (32% relative change). Size effect for mortality did not differ between both strata (10% relative improvement in both groups).

Conclusions

The SES is an independent predictor of mortality, clinically related hospitalisation, and HF hospitalisation in vulnerable patients with HF. The implementation of an intensive transitional care nurse-based HF management program improve clinical outcomes across SES strata. However, the size effect in the prevention of hospitalisation is more pronounced among patients with medium or high SES.

Funding Acknowledgement

Type of funding sources: None.

Neurohormonal activation induces intracellular iron deficiency and mitochondrial dysfunction in cardiac cells

Background

Iron deficiency (ID) is common in patients with heart failure (HF) and is associated with poor outcomes, yet its role in the pathophysiology of HF is not well-defined. We sought to determine the consequences of HF neurohormonal activation in iron homeostasis and mitochondrial function in cardiac cells.

Methods

HF was induced in C57BL/6 mice by using isoproterenol osmotic pumps and embryonic rat heart-derived H9c2 cells were subsequently challenged with Angiotensin II and/or Norepinephrine. The expression of several genes and proteins related to intracellular iron metabolism were assessed by Real time-PCR and immunoblotting, respectively. The intracellular iron levels were also determined. Mitochondrial function was analyzed by studying the mitochondrial membrane potential, the accumulation of radical oxygen species (ROS) and the adenosine triphosphate (ATP) production.

Results

Hearts from isoproterenol-stimulated mice showed a decreased in both mRNA and protein levels of iron regulatory proteins, transferrin receptor 1, ferroportin 1 and hepcidin compared to control mice. Furthermore, mitoferrin 2 and mitochondrial ferritin were also downregulated in the hearts from HF mice. Similar data regarding these key iron regulatory molecules were found in the H9c2 cells challenged with neurohormonal stimuli. Accordingly, a depletion of intracellular iron levels was found in the stimulated cells compared to non-stimulated cells, as well as in the hearts from the isoproterenol-induced HF mice. Finally, neurohormonal activation impaired mitochondrial function as indicated by the accumulation of ROS, the impaired mitochondrial membrane potential and the decrease in the ATP levels in the cardiac cells.

Conclusions

HF characteristic neurohormonal activation induced changes in the regulation of key molecules involved in iron homeostasis, reduced intracellular iron levels and impaired mitochondrial function. The current results suggest that iron could be involved in the pathophysiology of HF.

Reducing Time to Discovery: Materials and Molecular Modeling, Imaging, Informatics, and Integration

Multiscale and multimodal imaging of material structures and properties provides solid ground on which materials theory and design can flourish. Recently, KAIST announced 10 flagship research fields, which include KAIST Materials Revolution: Materials and Molecular Modeling, Imaging, Informatics and Integration (M3I3). The M3I3 initiative aims to reduce the time for the discovery, design and development of materials based on elucidating multiscale processing-structure-property relationship and materials hierarchy, which are to be quantified and understood through a combination of machine learning and scientific insights. In this review, we begin by introducing recent progress on related initiatives around the globe, such as the Materials Genome Initiative (U.S.), Materials Informatics (U.S.), the Materials Project (U.S.), the Open Quantum Materials Database (U.S.), Materials Research by Information Integration Initiative (Japan), Novel Materials Discovery (E.U.), the NOMAD repository (E.U.), Materials Scientific Data Sharing Network (China), Vom Materials Zur Innovation (Germany), and Creative Materials Discovery (Korea), and discuss the role of multiscale materials and molecular imaging combined with machine learning in realizing the vision of M3I3. Specifically, microscopies using photons, electrons, and physical probes will be revisited with a focus on the multiscale structural hierarchy, as well as structure-property relationships. Additionally, data mining from the literature combined with machine learning will be shown to be more efficient in finding the future direction of materials structures with improved properties than the classical approach. Examples of materials for applications in energy and information will be reviewed and discussed. A case study on the development of a Ni-Co-Mn cathode materials illustrates M3I3's approach to creating libraries of multiscale structure-property-processing relationships. We end with a future outlook toward recent developments in the field of M3I3.

Suppressed Degradation and Enhanced Performance of CsPbI3 Perovskite Quantum Dot Solar Cells via Engineering of Electron Transport Layers

CsPbI₃ perovskite quantum dots (CsPbI₃-PQDs) have recently come into focus as a light-harvesting material that can act as a platform through which to combine the material advantages of both perovskites and QDs. However, the low cubic-phase stability of CsPbI₃-PQDs in ambient conditions has been recognized as a factor that inhibits device stability. TiO₂ nanoparticles are the most regularly used materials as an electron transport layer (ETL) in CsPbI₃-PQD photovoltaics; however, we found that TiO₂ can facilitate the cubic-phase degradation of CsPbI₃-PQDs due to its vigorous photocatalytic activity. To address these issues, we have developed chloride-passivated SnO₂ QDs (Cl@SnO₂ QDs), which have low photocatalytic activity and few surface traps, to suppress the cubic-phase degradation of CsPbI₃-PQDs. Given these advantages, the CsPbI₃-PQD solar cells based on Cl@SnO₂ ETLs show significantly improved device operational stability (under conditions of 50% relative humidity and 1-sun illumination), compared to those based on TiO₂ ETLs. In addition, the Cl@SnO₂-based devices showed improved open circuit voltage and photocurrent density, resulting in enhanced power conversion efficiency (PCE) up to 14.5% compared to that of TiO₂-based control devices (PCE of 13.8%).

36,269 patients with chronic cardiovascular, metabolic and renal conditions: impact on clinical outcomes, medical resource use and health-related costs of deranged serum potassium levels

Background

Chronic Heart Failure (CHF) and its risk factors at stage A of the disease are conditions that trends to facilitate potassium (K+) derangements, for pathophysiology mechanisms and medication use than could facilitate both hyper- and hypokalamia. Studies on the associations between potassium derangements and clinical outcomes in these patient populations have yielded mixed findings, and the implications for healthcare expenditure are unknown.

Purpose

The objectives of our analysis was to asses the population-based associations between hyperkalemia, hypokalemia (compared to normokalemia) and all-cause death, urgent hospitalization, emergency department visits, daycare visits, and a yearly healthcare expenditure >85th percentile, in patients with chronic heart failure, chronic kidney disease, diabetes mellitus, hypertension and ischemic heart disease.

Methods

Population-based, longitudinal study including up to 36,269 patients from the Public Healthcare Area with at least one of those conditions. We used three linked administrative, hospital and primary care healthcare databases with exhaustive information on sociodemographics, medical diagnoses, pharmacy dispensing and laboratory data. Participants were identified and followed between 2015 and 2017, had to be ≥55 years old and have at least one serum potassium measurement recorded; and were classified as hyperkalemic, hypokalemic or normokalemic. Four analytic designs were used to evaluate prevalent and incident disease cases as well as prevalent and incident use of renin-angiotensin-aldosterone system inhibitors

Results

The majority of study participants remained normokalemic during the 3 months following study entry (ranging 94%–96%) and hyperkalemia was twice as frequent as hypokalemia. In all analyses, compared to normokalemic patients those with hyperkalemia had a worse crude event-free survival for all endpoints, and the worst survival was observed for hypokalemic patients [see Figure 1: prevalent case analysis; Kaplan-Meier cumulative survivor function curves for all-cause death (upper left), hospitalization (upper right), ED visits (lower left) and daycare visits (lower right)].

In multivariable-adjusted analyses, hyperkalemia was robustly and significantly associated with an increased risk of all-cause death (hazard ratios from Cox regression models ranging 1.31–1.68) and with an increased odds of a yearly healthcare expenditure >85th percentile (odds ratios 1.21–1.29). Associations were even stronger in hypokalemic patients (hazard ratios for all-cause death 1.92–2.60; odds ratios for healthcare expenditure >percentile 85th 1.81–1.85).

Conclusions

Experimental studies are needed to confirm whether prevention of potassium derangements reduces mortality and healthcare expenditure in patients with these chronic conditions. Until then, our findings provide further observational evidence on the potential importance of maintaining normal potassium levels in this setting.

Figure 1

Funding Acknowledgement

Type of funding source: Private grant(s) and/or Sponsorship. Main funding source(s): The present study was funded by an unrestricted research grant from Vifor Pharma.

Double check discharge planning to improve the results of a heart failure programme

Background

Reduction of readmissions in heart failure (HF) patients is a main goal of HF programmes. Establishing a discharge planning for the patient and coordinating it with primary care teams are key aspects for their success.

Purpose

Evaluate whether a double check discharge planning based on adding face-to-face joint weekly sessions with primary care managers to the conventional electronic communication of care plan reduces 6-month readmission and 6-month mortality.

Methods

We evaluated all patients discharged from hospital with HF as primary diagnosis between September 2017 and January 2019. We compared outcomes between patients discharged during Period #1 (single check; September 2017 - April 2018) and those discharged during Period #2 (double check; May 2018 - January 2019).

Primary endpoint was the combined endpoint of all-cause death or all-cause hospitalization 6 months after discharge from the index hospitalization.

Results

The study enrolled 317 patients: 182 in Period #1 and 135 in Period #2.

Mean age was 76±9 years. There was a higher proportion of patients with diabetes and COPD in Period #1, with no differences in other baseline characteristics.

The combined endpoint of all cause-death and all-cause hospitalization at 6 months was significantly reduced in patients in the double check discharge planning group (27% vs. 16%, p 0.021).

Conclusions

In a HF programme, the addition of a double check discharge planning based on having joint weekly sessions with primary care managers on top of the conventional electronic communication of care plan reduces 6-month readmission and 6-month mortality.

Funding Acknowledgement

Type of funding source: Public hospital(s). Main funding source(s): Hospital Universitari de Bellvitge

Effectiveness of nurse-led hospital-based heart failure programmes in octagenarians and nonagenarians: is age important?

Background

Efficacy of HF programmes in oldest old (octogenarians and nonagenarians) has not been fully explored.

Methods

We conducted a natural experiment evaluating all patients after hospitalization for heart failure as primary diagnosis between January 2017 and January 2019. We compared outcomes between patients discharged during Period #1, before the implementation of the program with patients discharged during Period #2, after the implementation of the 7-step bundle of interventions. We explored the interaction between age group (<80 vs. ≥80 years old) by the intervention modality (HF programme vs. usual care). Primary end-point was the combined end-point of all-cause death or all-cause hospitalization at 6 months after discharge from the index hospitalization.

Results

The study enroled 440 patients. Mean age of the whole cohort was 75±9 years. In the oldest old subgroup (n=160), mean age was 84±3. No differences were found in baseline characteristics of patients between usual care and HF program. 30-day all-cause readmission was significantly reduced in patients in the HF programme group compared to patients in the usual care group in both age strata. In unadjusted Cox regression analyses in the oldest old group, management of patients in the HF programme was significanty associated with a reduction in the risk of the primary end-point (HR: 0.50; 95% CI [0.29–0.85]; p=0.011).

Conclusions

Management of patients in a nurse-led integrated care-based heart failure programme results in reduction of all-cause death or all-cause hospitalizations in oldest old patients.

Event-free survival cumulative curves.

Funding Acknowledgement

Type of funding source: None

Epidemiology of potassium derangements among chronic cardiovascular, metabolic and renal conditions: a population-based analysis data from more than 375,000 individuals

Introduction

In patients with chronic cardiovascular, metabolic and renal disorders, potassium (K)+ homeostasis is often delicate, especially in the presence of renin-angiotensin-aldosterone system inhibition (RAASI) and/or diuretic therapies. In this context, current clinical practical guidelines for the management of these patients recommend close monitoring of renal function and K+ levels, particularly in the presence of drug titration. Nevertheless, very limited epidemiological data on their importance at a population level is available.

Purpose

The objectives of the present analysis are to estimate the prevalence of potassium (K+) derangements in five key chronic cardiovascular, metabolic and renal conditions at the population level, its use of RAASI medication and describe potassium derangements among RAASI users.

Methods

We used data from more than 375,000 individuals 55 years of age or older included in the population-based healthcare database of a public Institute of Health between 2015 and 2017. The conditions of interest were chronic heart failure (CHF), chronic kidney disease (CKD), diabetes mellitus (DM), ischemic heart disease (IHD), and hypertension (HTN). RAASI medications included angiotensin converting enzyme inhibitors, angiotensin II receptor blockers, mineralocorticoid receptor antagonists (MRAs), and rennin inhibitors. Hyperkalemia was defined as K+ levels >5.0 mEq/L and hypokalemia as K+ <3.5 mEq /L

Results

The prevalence of chronic cardiovascular, metabolic and renal conditions was high, particularly of HTN (48.2–48.9%). The prevalence of hyperkalemia was ranging between 10% and 25% depending of the condition, more frequent in CKD and less frequent in HTN patients. In figure, we display the prevalence of hyperkalemia among individuals with each of the relevant chronic conditions, January 1st, 2016 and January 1st, 2017. Use of at least one RAASI medication was very prevalent in HTN patients (75.2–77.3%). Among RAASI users, the frequency of K+ derangements and mainly of hyperkalemia was very noticeable (12% overall), especially in patients with CKD, CHF, elderly individuals, and users of MRAs. Hypokalemia was less frequent (1%).

Conclusion

The high prevalence of K+ derangements and predominantly hyperkalemia among RAASI users highlights the real-world relevance of K+ derangements and the importance of close monitoring and management of K+ levels in routine clinical practice. This is likely to benefit a large number of patients, particularly those at higher risk.

Figure 1. Prevalence of hyperkalemia

Funding Acknowledgement

Type of funding source: Private grant(s) and/or Sponsorship. Main funding source(s): Josep Comin-Colet and Miguel Cainzos-Achirica have participated in other research projects funded by unrestricted grants from Vifor Pharma

Psychosocial and clinical factors associated with poor self-care in patients with chronic heart failure

Background

Self care is a crucial factor in the education of patients with heart failure (HF) and directly impacts in the progression of the disease.

Beyond heart failure related factors, the role of psychosocial determinants and its interaction with clinical aspects has not been fully explored.

Aims

The aim of the study was to analyze both clinical and psychosocial factors associated with poor self care in patients with chronic HF.

Methods

Self care was evaluated at baseline with the 9 item European HFR Self Care Behaviour Scale (9 item ESCBS).

Scores were standardized and reversed from 0 (worst self care) to 100 (better self care). This study we analysed the associations between poor self care (defined as scores in the lower tertile of the 9 item ESCBS) with demographic, HF-related (clinical) and psychosocial factors in all patients at baseline.

Results

We included 1123 patients: mean age 72±11, 639 (60%) were male, mean LVEF 45±17 and 454 (40%) were in NYHA class III or IV. Mean score of the 9-item ESCBS was 69±28. In the clinical multivariate analyses HF-related factors associated with poor self-care were serum albumins level, ckd level and previous admission due to heart failure. In the psychosocial multivariate analyses poor social support, depressive symptoms and needing a caregiver were independently associated with poor self care. In combined models, only psychosocial factors were independently associated with poor self care whereas no clinical factors remain in the model.

Conclusion

Our study showed that psychosocial conditions are the main factors independently associated with poor self-care in patients with chronic heart failure

Funding Acknowledgement

Type of funding source: Public hospital(s). Main funding source(s): Hospital del Bellvitge

Association between self-care and prognosis in 1123 patients with chronic heart failure

Background

Self-care is a crucial factor in the education of patients with heart failure (HF) and directly impacts in the progression of the disease. However, little is published about its major clinical implications as admission or mortality in patients with HF.

Aims and methods

The aim of the study was to analyze time to admission due to acute heart failure and mortality associated with poor self-care in patients with chronic HF.

We prospectively recruited consecutive patients with stable chronic HF referred to a nurse-led HF programme. Selfcare was evaluated at baseline with the 9 item European Heart Failure Self-Care Behavior Scale. Scores were standardized and reversed from 0 (worst selfcare) to 100 (better self care). For the purpose of this study we analyzed the associations of worse self-care (defined as scores below the lower tertile of the scale) with demographic, disease-related (clinical) and psychosocial factors in all patients at baseline.

Results

We included 1123 patients, mean age 72±11, 639 (60%) were male, mean LVEF 45±17 and 454 (40,4%) were in NYHA class III or IV. Mean score of the 9-item ESCBE was 69±28. Score below 55 (lower tertile) defined impaired selfcare behaviour.

Those patients with worse self-care had more ischaemic heart disease, more COPD, and they achieved less distance in the 6 minute walking test. Regarding psychosocial items patients in lower tertile of self-care needed a caregiver more frequently, they present more cognitive impairment, depressive symptoms and worse score in terms of health self-perception.

Multivariate Cox Models showed that a score below 55 points in 9-item ESCBE was independently associated with higher readmission due to acute heart failure [HR 1.26 (1.02–1.57), p value=0.034] and with mortality [HR 1.24 CI95% (1.02–1.50), p value=0.028]

Conclusion

Poor self-care measured with the modified 9-item ESCBE was associated with higher risk of admission due to acute decompensation and higher risk of mortality in patients with chronic heart failure.

These results highlight the importance of assessing self-care and provide measures to improve them.

Funding Acknowledgement

Type of funding source: Public hospital(s). Main funding source(s): Hospital Univesitario de Bellvitge

A population-based analysis in 375,233 cases of heart failure stages A, B and C. Real world epidemiology of prevalence and temporal trends in South-European populations

Background

Prevalence of congestive heart failure (CHF) and predisposing conditions has described previously. Most of these studies evaluated centre-European or north-American populations. However, the prevalence and evolutionary changes of Heart Failure stages A, B and C has not been fully elucidated in Mediterranean cohorts.

Purpose

To estimate the prevalence of CHF (HF Stage C) and four additional key chronic cardiovascular, metabolic and renal conditions predisposing to the development of CHF (HF Stages A and B) at a population level in a south-European healthcare area. We analysed the evolutionary changes in the prevalence in these five conditions.

Methods

In a healthcare area of 1,3Millions inhabitants, we extracted health related information of all individuals ≥55 years old. We analysed data of 375,233 individuals included in the population-based healthcare database of a public Institute of Health between 2015 and 2017. The conditions of interest were CHF, chronic kidney disease (CKD), diabetes mellitus (DM), ischemic heart disease (IHD) and hypertension (HTN).

Results

The prevalence of chronic conditions was high, particularly of HTN (48.2–48.9%) and DM individuals (14.6–14.8%). The other conditions were less frequent, with prevalence around 2–4% for IHD, 5–9% for CKD and 2–4% for CHF (Table). However, the less frequent conditions had a striking upward trend with over 1,500 new prevalent cases per year between 2015 and 2017 for CHF (45% relative increase), more than 2,500 new prevalent cases for IHD (67% relative increase) and more than 4,000 new prevalent cases per year for CKD (44% relative increase).

Conclusion

In this south European cohort, there were a high prevalence of HTN and DM as risk factors and a significant trend of increasing prevalence in high cost chronic conditions such as CHF, IHD and CKD.

Funding Acknowledgement

Type of funding source: Private company. Main funding source(s): The present study was funded by an unrestricted research grant from Vifor Pharma.

Long-term effectiveness of a nurse-led 7-step transitional intervention programme in heart failure

Background

Reduction of 30-day readmission in heart failure (HF) patients is a main goal of health-care systems. Programmes to decrease 30-day readmission have successfully reduced it but have failed to neither maintain benefit afterwards nor decrease mortality. Moreover, in many cases the price of reducing 30-day readmission is a mortality increase.

Purpose

Evaluate whether the impact of a fully nurse-led HF programme directed to reduce 30-day readmission and mortality extends to longer periods of time, including 90 days and 180 days after discharge.

Methods

We evaluated all patients discharged from hospital with HF as primary diagnosis between January 2017 and January 2019. We compared outcomes between patients discharged during Period #1 (pre-programme; Jan 2017 - Aug 2017) and those discharged during Period #2 (HF programme; Sept 2017 - Jan 2019).

Primary endpoint was the combined endpoint of all-cause death or all-cause hospitalization 90 days and 180 days after discharge from the index hospitalization.

Results

The study enrolled 440 patients: 123 in Period #1 and 317 in Period #2.

Mean age was 75±9 years. There was a higher proportion of female patients in Period #2 (38.2% vs 26.8%, p=0.025), with no differences in other baseline characteristics.

The combined endpoint of all cause-death and all-cause hospitalization was significantly reduced in patients in the HF programme group, both at 90 days [OR 0.37 (0.22–0.63), p<0.001] and at 180 days [OR 0.27 (CI 0.17–0.43), p<0.001]. Such a decrease was at expense of a reduction in cardiovascular (CV) hospitalization and HF hospitalization.

There were no differences between groups in mortality [OR 0.96 (0.18–5.00), p=0.293].

Conclusions

A fully nurse-led HF programme reduces the combined endpoint of all-cause death and all-cause hospitalization both at 90 days and 180 days after an index discharge for HF.

Such a decrease is driven by a reduction of CV and HF hospitalization, which are maintained over time. There were no differences between groups in mortality.

Funding Acknowledgement

Type of funding source: Public hospital(s). Main funding source(s): Hospital Universitari de Bellvitge

0021 RNA Sequencing Reveals Transcriptomic Changes in Individuals with Insomnia

Introduction

Insomnia affects 10–20% of the US population and is associated with negative health and psychosocial sequelae. Despite the public health impact of insomnia little is known about its underlying molecular mechanisms. The purpose of this study is to examine differentially expressed genes in 15 patients with chronic insomnia and age- and sex-matched good sleepers (n=15).

Methods

We performed total RNA-seq on 30 whole blood samples collected at 09:00 at 150 bp paired-ends on the Illumina NovaSeq-6000 platform. Alignment was performed using the STAR version 2.7.2a software on the human reference genome (GRCh38). Differential gene expression analysis was performed using DESeq2 version 1.24.0. Pathway analysis was performed using IPA, release 2019-08-30.

Results

An average of 86.7 million paired end reads per sample were sequenced. We found that 289 genes were differentially expressed in insomnia patients with a log fold change (LFC) ±0.50 and had a FDR p-value < 0.05. Top dysregulated genes include CSMD1 (L2FC=-2.78; p=1.35E-06), DUX4L9 (L2FC=3.40; p=2.81E-06) and GRM4 (L2FC=2.45; p=4.50E-05). Among the functionally relevant genes, CSMD encodes a complement control protein that is known to participate in the complement activation and inflammation in the developing central nervous system. UTS2 (L2FC=1.778; p=8.94E-06) is involved in regulation of orexin A and B activity and rapid eye movement during sleep. Ingenuity Pathway Analysis revealed 3 associated networks: Hematological, Hereditary Disorder, Organismal Injury and Abnormalities (score: 46), Developmental, Hereditary Disorder, Metabolic Disease (score: 43), and Cell Cycle, Cell mediated Immune Response, Cellular Development (score: 43).

Conclusion

Overall, our study revealed dysregulated genes in individuals who suffer from insomnia. Notably, dysregulation of these functionally relevant genes could impair functional brain connectivity and synaptic function. Further investigation of these biological pathways will be useful to elucidate the pathogenesis of insomnia and identify novel biomarkers or drug targets for developing improved diagnostics and therapeutics.

Support

National Institutes of Nursing Research, Graduate Partnership Program

0024 PTSD with Concurrent Excessive Daytime Sleepiness Alters Gene Expression in Military Personnel and Veterans; An RNA-Sequencing Study

Introduction

Up to 91% of military personnel and veterans with posttraumatic stress disorder (PTSD) report co-occurring sleep disturbances, including. insomnia and excessive daytime sleepiness (EDS). Sleep disturbances have been shown not only to increase the risk of developing PTSD, but to exacerbate and maintain PTSD symptomology. The aim of this study was to examine gene expression in active duty military personnel and veterans with PTSD, with and without EDS. Participants were categorized into three groups; 1) PTSD with EDS (PTSDwEDS; n=21), 2) PTSD without EDS (PTSDnoEDS; n=25), or 3) Controls (no PTSD and no EDS; n=57).

Methods

Participants were 79% male, mean age of 37.6years (SD=11.2years). PTSD symptoms were measured using the PTSD checklist for civilians (PCL-C); participants were classified as PTSD-present using DSM-IV-TR criteria of “moderate-to-severe”. Daytime sleepiness was assessed using the Epworth Sleepiness Scale (ESS), high sleepiness was indicated by an ESS score >13. We performed RNA-seq with Illumina’s HiSeq 2500 in paired-end. We conducted quality control using FastQC and aligned to GRCh38 reference genome using STAR (v2.5.3a). Differentially expressed genes identified using DESeq2 (v1.20.0) with False Discovery Rate of 0.10. Finally, Ingenuity Pathway Analysis (IPA) was conducted to identify dysregulated gene networks.

Results

Between the Controls and PTSDnoEDS groups, two genes were significantly dysregulated. In controls and PTSDwEDS groups, 251 genes were dysregulated. The IPA networks showed that genes associated with inflammation were significantly dysregulated. Finally, between PTSDwEDS and PTSDnoEDS there were 1,873 significantly dysregulated genes. The IPA networks identified dysregulation of genes related to sleep, fatigue, circadian, and mitochondrial function.

Conclusion

Taken together this data indicates that EDS that is co-morbidly experienced with PTSD is associated with significant gene dysregulation, above and beyond that observed in participants with PTSD without significant EDS and controls. Treating EDS in military personnel and veterans with PTSD is important.

Support

This work was supported by the Center for Neuroscience and Regenerative Medicine (CNRM)

Ischaemic Lumbosacral Plexopathy following an Acute Thrombosed Abdominal Aortic Aneurysm Mimicking Stroke: A Case Report

Neuropathy is a disease affecting the nerves that can be caused by infectious, ischaemic, or autoimmune disease. Aortic thrombosis may develop neurologic symptoms; however, when unilateral paraplegia is the first main symptom, it could be misinterpreted as a neuropathy. An 82-year-old man with a history of intracranial haemorrhage complained of motor weakness in the right lower extremity. Magnetic resonance imaging did not show any evidence of cerebral infarction or haemorrhage. A subsequent computed tomography angiogram confirmed the diagnosis of an acutely thrombosed abdominal aortic aneurysm and revealed thrombosed common, internal and external iliac arteries bilaterally including the left femoral artery. Aortobifemoral bypass surgery with open thrombectomy was performed. The patient recovered successfully despite a tendency for bleeding due to the use of anticoagulants. In conclusion, this is a rare case with the initial predominant presentation being painless unilateral paraplegia mimicking stroke. (Hong Kong j.emerg. med. 2016;23:52-56)

First report of carp oedema virus infection of koi (Cyprinus carpio haematopterus) in the Republic of Korea

Twenty-five koi (Cyprinus carpio haematopterus) bought from a wholesale fish market in Korea, showed lethargic behaviour and 100% mortality within 20 days. Carp oedema virus (CEV) was detected by PCR in all 25 koi. Results of detailed histopathological and clinical examinations of 17 koi indicated loss of body balance, severe infiltration of inflammatory cells into the inter-lamellar spaces of the gills and vacuolization and inclusion bodies in gill epithelial cells. Sequence analysis of PCR products of these koi showed up to 99% identity to the previously reported sequences, suggesting that the observed mass mortality resulted from koi sleepy disease (KSD) due to CEV infection. To the best of our knowledge, this study is the first report of KSD in the Republic of Korea. Partial sequences of 4a protein from the virus indicated that the present CEV detected in koi from Korea is more closely related to that from the UK and Poland than from Japan. The present findings indicate that the prevalence and spread of KSD must be closely monitored in both European and Asian countries to avoid potential economic losses to the global koi industry.

Widespread cortical thinning in patients with neuromyelitis optica spectrum disorder

BACKGROUND AND PURPOSE

Studies on cortical involvement and its relationship with cognitive function in patients with neuromyelitis optica spectrum disorder (NMOSD) remain scarce. The objective of this study was to compare cortical thickness on magnetic resonance imaging (MRI) between patients with NMOSD and multiple sclerosis (MS) and to investigate its relationship with clinical features and cognitive function.

METHODS

This observational clinical imaging study of 91 patients with NMOSD, 52 patients with MS and 44 healthy controls was conducted from 1 December 2013 to 30 April 2015 at the institutional referral center. Three tesla MRI of the brain and neuropsychological tests were performed. Cortical thickness was measured using three-dimensional surface-based analysis.

RESULTS

Both sets of patients exhibited cortical thinning throughout the entire brain cortex. Patients with MS showed a significantly greater reduction in cortical thickness over broad regions of the bilateral frontal and parieto-temporal cortices and the left precuneus compared to those with NMOSD. Memory functions in patients with MS were correlated with broad regional cortical thinning, whereas no significant associations were observed between cortical thickness and cognitive function in patients with NMOSD.

CONCLUSIONS

Widespread cortical thinning was observed in patients with NMOSD and MS, but the extent of cortical thinning was greater in patients with MS. The more severe cortical atrophy may contribute to memory impairment in patients with MS but not in those with NMOSD. These results provide in vivo evidence that the severity and clinical relevance of cortical thinning differ between NMOSD and MS.

Clinicopathologic and prognostic significance of c-MYC copy number gain in lung adenocarcinomas

BACKGROUND

c-MYC copy number gain (c-MYC gain) has been associated with aggressive behaviour in several cancers. However, the role of c-MYC gain has not yet been determined in lung adenocarcinomas classified by genetic alterations in epidermal growth factor receptor (EGFR), KRAS, and anaplastic lymphoma kinase (ALK) genes. We investigated the clinicopathologic and prognostic significance of c-MYC gain for disease-free survival (DFS) and overall survival (OS) according to EGFR, KRAS, and ALK gene status and stages in lung adenocarcinomas.

METHODS

In 255 adenocarcinomas resected in Seoul National University Bundang Hospital from 2003 to 2009, fluorescence in situ hybridisation (FISH) with c-MYC probe and centromeric enumeration probe 8 (CEP8) was analysed using tissue microarray containing single representative core per each case. EGFR (codon 18 to 21) and KRAS (codon 12, 13, and 61) mutations were analysed by polymerase chain reaction and direct sequencing method from formalin-fixed, paraffin-embedded tissue sections. ALK rearrangement was determined by FISH method. c-MYC gain was defined as >2 copies per nucleus, chromosome 8 gain as ⩾3 copies per nucleus, and gain of c-MYC:CEP8 ratio (hereafter, c-MYC amplification) as ⩾2.

RESULTS

We observed c-MYC gain in 20% (51 out of 255), chromosome 8 gain in 5.5% (14 out of 255), c-MYC amplification in 2.4% (6 out of 255), EGFR mutation in 49.4% (118 out of 239), KRAS mutation in 5.7% (7 out of 123), and ALK rearrangement in 4.9% (10 out of 205) of lung adenocarcinomas. c-MYC gain was observed in 19% (22 out of 118) of patients with lung adenocarcinomas with an EGFR mutation, but not in any patients with a KRAS mutation, or an ALK rearrangement. c-MYC gain (but not chromosome 8 gain or c-MYC amplification) was an independent poor-prognostic factor in the full cohort of lung adenocarcinoma (P=0.022, hazard ratio (HR)=1.71, 95% confidence interval (CI), 1.08-2.69 for DFS; P=0.032, HR=2.04, 95% CI, 1.06-3.91 for OS), as well as in stage I subgroup (P=0.023, HR=4.70, 95% CI, 1.24-17.78 for DFS; P=0.031, HR=4.65, 95% CI, 1.15-18.81 for OS), and in EGFR-mutant subgroup (P=0.022; HR=2.14; 95% CI, 1.11-4.10 for DFS).

CONCLUSIONS

c-MYC gain (but not chromosome 8 gain or c-MYC amplification) was an independent poor-prognostic factor for DFS and OS in lung adenocarcinomas, both in full cohort and stage I cancer, and possibly for DFS in EGFR-mutant adenocarcinomas. Additional studies are required to determine if patients with lung adenocarcinoma with c-MYC gain are candidates for additional first-line treatment to mitigate their increased risk for disease progression and death.

Rhabdomyolysis associated with initiation of febuxostat therapy for hyperuricaemia in a patient with chronic kidney disease

WHAT IS KNOWN AND OBJECTIVE

Febuxostat is now recommended as the first-line pharmacological urate-lowering therapy for gout in the American College of Rheumatology guidelines. There is no case of rhabdomyolysis associated with febuxostat among reported side effects of the drug. Our objective is to report on a case of rhabdomyolysis associated with initiation of febuxostat in a patient with chronic kidney disease (CKD).

CASE SUMMARY

A 73-year-old male patient visited our emergency room due to progressive weakness in both lower extremities starting 3 days earlier. Ten days before presentation, his primary physician had changed his prescription from allopurinol to febuxostat (80 mg) because of poor control of uric acid levels. There was tenderness in both thighs. Initial creatinine kinase (CK) was 7652 U/L (0-170 U/L), and a bone scan using (99m) Tc-HDP revealed strong uptake in soft tissues in both thighs and buttocks. Electromyography (EMG) and nerve conduction velocity (NCV) showed abnormal spontaneous activities (ASA), suggesting myopathy, not nerve damage. On day 7 of admission, after conservative management and febuxostat withdrawal, he could walk on the ward. He is being followed in our clinic as an outpatient with no sequelae.

WHAT IS NEW AND CONCLUSION

This report is first case of rhabdomyolysis associated with initiation of febuxostat. Febuxostat should be withdrawn when rhabdomyolysis is confirmed.