Improved survival after non-traumatic subarachnoid haemorrhage with structured care pathways and modern intensive care

m6A regulator–mediated RNA methylation modification patterns and immune microenvironment infiltration characterization in patients with intracranial aneurysms

Background

The role of epigenetic modulation in immunity is receiving increased recognition—particularly in the context of RNA N6-methyladenosine (m6A) modifications. Nevertheless, it is still uncertain whether m6A methylation plays a role in the onset and progression of intracranial aneurysms (IAs). This study aimed to establish the function of m6A RNA methylation in IA, as well as its correlation with the immunological microenvironment.

Methods

Our study included a total of 97 samples (64 IA, 33 normal) in the training set and 60 samples (44 IA, 16 normal) in the validation set to systematically assess the pattern of RNA modifications mediated by 22 m6A regulators. The effects of m6A modifications on immune microenvironment features, i.e., immune response gene sets, human leukocyte antigen (HLA) genes, and infiltrating immune cells were explored. We employed Lasso, machine learning, and logistic regression for the purpose of identifying an m6A regulator gene signature of IA with external data validation. For the unsupervised clustering analysis of m6A modification patterns in IA, consensus clustering methods were employed. Enrichment analysis was used to assess immune response activity along with other functional pathways. The identification of m6A methylation markers was identified based on a protein–protein interaction network and weighted gene co-expression network analysis.

Results

We identified an m6A regulator signature of IGFBP2, IGFBP1, IGF2BP2, YTHDF3, ALKBH5, RBM15B, LRPPRC, and ELAVL1, which could easily distinguish individuals with IA from healthy individuals. Unsupervised clustering revealed three m6A modification patterns. Gene enrichment analysis illustrated that the tight junction, p53 pathway, and NOTCH signaling pathway varied significantly in m6A modifier patterns. In addition, the three m6A modification patterns showed significant differences in m6A regulator expression, immune microenvironment, and bio-functional pathways. Furthermore, macrophages, activated T cells, and other immune cells were strongly correlated with m6A regulators. Eight m6A indicators were discovered—each with a statistically significant correlation with IA—suggesting their potential as prognostic biological markers.

Conclusion

Our study demonstrates that m6A RNA methylation and the immunological microenvironment are both intricately correlated with the onset and progression of IA. The novel insight into patterns of m6A modification offers a foundation for the development of innovative treatment approaches for IA.

Cardiac arrest in spontaneous subarachnoid hemorrhage and associated outcomes

OBJECTIVE

The authors sought to analyze a large, publicly available, nationwide hospital database to further elucidate the impact of cardiopulmonary arrest (CA) in association with subarachnoid hemorrhage (SAH) on short-term outcomes of mortality and discharge disposition.

METHODS

This retrospective cohort study was conducted by analyzing de-identified data from the National (Nationwide) Inpatient Sample (NIS). The publicly available NIS database represents a 20% stratified sample of all discharges and is powered to estimate 95% of all inpatient care delivered across hospitals in the US. A total of 170,869 patients were identified as having been hospitalized due to nontraumatic SAH from 2008 to 2014.

RESULTS

A total of 5415 patients (3.2%) were hospitalized with an admission diagnosis of CA in association with SAH. Independent risk factors for CA included a higher Charlson Comorbidity Index score, hospitalization in a small or nonteaching hospital, and a Medicaid or self-pay payor status. Compared with patients with SAH and not CA, patients with CA-SAH had a higher mean NIS Subarachnoid Severity Score (SSS) ± SD (1.67 ± 0.03 vs 1.13 ± 0.01, p < 0.0001) and a vastly higher mortality rate (82.1% vs 18.4%, p < 0.0001). In a multivariable model, age, NIS-SSS, and CA all remained significant independent predictors of mortality. Approximately 18% of patients with CA-SAH survived and were discharged to a rehabilitation facility or home with health services, outcomes that were most predicted by chronic disease processes and large teaching hospital status.

CONCLUSIONS

In the largest study of its kind, CA at onset was found to complicate roughly 3% of spontaneous SAH cases and was associated with extremely high mortality. Despite this, survival can still be expected in approximately 18% of patients.

Identification of upregulated NF-κB inhibitor alpha and IRAK3 targeting lncRNA following intracranial aneurysm rupture-induced subarachnoid hemorrhage

Background

This study was performed to identify genes and lncRNAs involved in the pathogenesis of subarachnoid hemorrhage (SAH) from ruptured intracranial aneurysm (RIA).

Methods

Microarray GSE36791 was downloaded from Gene Expression Omnibus (GEO) database followed by the identification of significantly different expressed RNAs (DERs, including lncRNA and mRNA) between patients with SAH and healthy individuals. Then, the functional analyses of DEmRNAs were conducted and weighted gene co-expression network analysis (WGCNA) was also performed to extract the modules associated with SAH. Following, the lncRNA-mRNA co-expression network was constructed and the gene set enrichment analysis (GSEA) was performed to screen key RNA biomarkers involved in the pathogenesis of SAH from RIA. We also verified the results in a bigger dataset GSE7337.

Results

Totally, 561 DERs, including 25 DElncRNAs and 536 DEmRNAs, were identified. Functional analysis revealed that the DEmRNAs were mainly associated with immune response-associated GO-BP terms and KEGG pathways. Moreover, there were 6 modules significantly positive-correlated with SAH. The lncRNA-mRNA co-expression network contained 2 lncRNAs (LINC00265 and LINC00937) and 169 mRNAs. The GSEA analysis showed that these two lncRNAs were associated with three pathways (cytokine-cytokine receptor interaction, neurotrophin signaling pathway, and apoptosis). Additionally, IRAK3 and NFKBIA involved in the neurotrophin signaling pathway and apoptosis while IL1R2, IL18RAP and IL18R1 was associated with cytokine-cytokine receptor interaction pathway. The expression levels of these genes have the same trend in GSE36791 and GSE7337.

Conclusion

LINC00265 and LINC00937 may be implicated with the pathogenesis of SAH from RIA. They were involved in three important regulatory pathways. 5 mRNAs played important roles in the three pathways.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12883-021-02156-1.

Identification of inflammation‑associated circulating long non‑coding RNAs and genes in intracranial aneurysm rupture‑induced subarachnoid hemorrhage

Ruptured intracranial aneurysm (IA)-induced subarachnoid hemorrhage (SAH) triggers a series of immune responses and inflammation in the brain and body. The present study was conducted to identify additional circulating biomarkers that may serve as potential therapeutic targets for SAH-induced inflammation. Differentially expressed (DE) long non-coding RNAs (lncRNAs; DElncRNAs) and genes (DEGs) in the peripheral blood mononuclear cells between patients with IA rupture-induced SAH and healthy controls were identified in the GSE36791 dataset. DEGs were used for weighted gene co-expression network analysis (WGCNA), and SAH-associated WGCNA modules were identified. Subsequently, an lncRNA-mRNA regulatory network was constructed using the DEGs in SAH-associated WGCNA modules. A total of 25 DElncRNAs and 1,979 DEGs were screened from patients with IA-induced SAH in the GSE36791 dataset compared with the controls. A total of 11 WGCNA modules, including four upregulated modules significantly associated with IA rupture-induced SAH were obtained. The DEGs in the SAH-associated modules were associated with Gene Ontology biological processes such as ‘regulation of programmed cell death’, ‘apoptosis’ and ‘immune response’. The subsequent lncRNA-mRNA regulatory network included seven upregulated lncRNAs [HCG27, ZNFX1 antisense RNA 1, long intergenic non-protein coding RNA (LINC)00265, murine retrovirus integration site 1 homolog-antisense RNA 1, cytochrome P450 1B1-AS1, LINC01347 and LINC02193] and 375 DEGs. Functional enrichment analysis and screening in the Comparative Toxicogenomics Database demonstrated that SAH-associated DEGs, including neutrophil cytosolic factor (NCF)2 and NCF4, were enriched in ‘chemokine signaling pathway’ (hsa04062), ‘leukocyte transendothelial migration’ (hsa04670) and ‘Fc gamma R-mediated phagocytosis’ (hsa04666). The upregulated lncRNAs and genes, including NCF2 and NCF4, in patients with IA rupture-induced SAH indicated their respective potentials as anti-inflammatory therapeutic targets.

Different predictors after stroke depending on functional dependency at discharge: a 5-year follow up study

BACKGROUND

Level of dependency after a stroke is important for long-term outcome in several aspects, but less is known about important predictors for outcome depending on functional dependency. The aim of the current study was to investigate self-perceived outcome and identify possible predictors of strength, participation, and emotional outcome 5 years after stroke based on functional dependency at discharge from hospital.

METHODS

This observational cohort study included participants living in Gothenburg that were diagnosed with first ever stroke in 2009 and 2010. Baseline data were gathered from medical charts and the outcome was based on the Stroke Impact Scale (SIS) questionnaire mailed out 5 years post-stroke. Logistic regression identified potential predictors of better strength, participation, and emotional outcome.

RESULTS

A total of 266 participants responded to the SIS. The functionally independent participants at hospital discharge reported significantly better scores in all SIS domains compared to the functionally dependent. For those who were functionally independent, only non-modifiable factors (age, sex, stroke type) were significant predictors of a better outcome. However, for the functionally dependent participants, modifiable factors such as feeling depressed, cardiovascular risk factors, and recurrent stroke were significant predictors of unfavourable outcome.

CONCLUSIONS

Important factors for predicting a favourable outcome differed due to the level of functional dependency, and modifiable factors were only present in participants that were functionally dependent at discharge. Prevention, detection, and treatment of modifiable factors give an opportunity to reduce the burden of stroke for those who are most vulnerable.

Experienced pain after stroke: a cross-sectional 5-year follow-up study

Background

Stroke is one of the most common cause of disability worldwide. Pain is common in both stroke survivors and in the general population. Consequences of post-stroke pain (PSP) include reduced quality of life and are important to consider. The aim of the current study was to explore the experience of pain 5 years after stroke, and factors associated with the experience of pain.

Methods

Inclusion criteria were: First ever stroke, treated at Sahlgrenska University Hospital, Sweden, during an 18 months period in 2009–2010, aged 18 years or older. Furthermore, the participants had to respond to a set of questionnaires 5 years post-stroke. Baseline data were collected from medical records and follow-up data from the set of questionnaires. The primary outcome was based on the question Do you experience pain? Predictors and explanatory factors for experiencing more frequent pain were analysed with logistic regression.

Results

A total of 281 participants were included. Almost 40% experienced pain to some degree 5 years post-stroke (15% reported pain frequently), and 25% felt that their needs for pain treatment were not met. The participants experiencing more frequent pain reported poorer quality of life, self-perceived health status and recovery post-stroke. Functional dependency at discharge from hospital, experiencing depression at follow up and restricted mobility at follow up were all associated with more frequent pain.

Conclusion

Pain is common 5 years post-stroke and the treatment is not perceived as optimal. The persons experiencing more frequent pain seem to rate their health and recovery worse than the persons experiencing less frequent pain. Most of the factors associated with more frequent pain were treatable and this emphasize the importance of standardised follow-up care that takes pain into consideration.

Symptoms and consequences of subarachnoid haemorrhage after 7 years

Objectives

Short‐term follow‐up studies after a subarachnoid haemorrhage (SAH) have shown impaired cognition, fatigue, depression and anxiety, but less is known regarding long‐term consequences. The aim of this study was to investigate health outcomes in persons 7 years after SAH.

Materials and Methods

This is a descriptive cohort follow‐up study of persons with non‐traumatic SAH treated at Sahlgrenska University Hospital, Gothenburg, Sweden. The follow‐up was conducted 7 years post‐treatment and included home visits using forms and questionnaires about health outcomes; the Barthel Index (BI), modified Rankin Scale (mRS), National Institutes of Health Stroke Scale (NIHSS), Hospital Anxiety and Depression Scale (HADS), Montreal Cognitive Assessment (MoCA) and Multidimensional Fatigue Inventory (MFI).

Results

Seven years post‐SAH, 33 persons fulfilled the inclusion criteria, of whom 18 (55%) participated (median age 63 years). Cognitive impairment was present in 11 participants, assessed with the MoCA, where the item of delayed recall was most difficult. The majority (n = 16) were independent in activities of daily living (ADL), and few (n = 3) had physical symptoms according to the NIHSS. However, three participants were free from disability according to the mRS. Nearly, half of the participants had symptoms of anxiety (n = 8). Three had symptoms of depression and more than half experienced fatigue.

Conclusion

The physical function and independency in ADL is high among long‐term SAH survivors. Despite this, only a few were completely free from disability, and the main problems 7 years after SAH were cognitive impairment and anxiety.

Participation and autonomy five years after stroke: A longitudinal observational study

OBJECTIVE

Stroke is the second most common cause of disability in the world. The purpose of this study was to evaluate the participation and autonomy of persons with stroke, five years after a stroke, and to explore potential associations between factors and perceived restrictions in participation and autonomy.

METHODS

This five-year follow-up survey study included individuals diagnosed with a first-time stroke during 2009-2010, in Gothenburg. The survey included the Impact of Participation and Autonomy-questionnaire (IPA-E), which comprised five domains: Autonomy Indoor, Family Role, Autonomy Outdoor, Work & Education, and Social Life & Relationships. Logistic regression analyses were used to analyze factors associated with participation restrictions.

RESULTS

At 5 years after a stroke, 457 patients were alive; of these, 281 responded to the follow-up survey. Participation restrictions were most pronounced in the IPA-E domains of Autonomy Outdoors, Work/Education, and Social Life and Relationships. In contrast, restrictions were less pronounced in the IPA-E domains of Autonomy Indoors and Family Role. Severe stroke, older age, and female sex predicted participation restrictions at five years after a stroke. Participation restrictions were partly explained by feelings of depression at five years after stroke. Problems associated with participation restrictions were most frequently observed in the areas of mobility, leisure, and help/support from other people.

CONCLUSION

This study showed that participation and autonomy were restricted among persons with stroke at five years after the stroke. The domains perceived as most restricted were those that required high levels of physical, social, and cognitive abilities.

Return to work predicts perceived participation and autonomy by individuals with stroke

Purpose: Participation in activities of everyday life is seen as main goal of rehabilitation after a stroke and return to work is an important factor to consider for the substantial number of persons having a stroke at working age. The current study aims to investigate whether returning to work would predict self-perceived participation and autonomy in everyday life after a stroke, from a long-term perspective.Materials and methods: Persons with first-ever stroke at age 18-63 years in 2009-2010, Gothenburg, were included. As 5-year follow-up, the Impact on Participation and Autonomy questionnaire was sent out, investigating self-perceived participation/autonomy in five levels, and work status was investigated from national sick-absence registers. Prediction of work on participation/autonomy was investigated with logistic regression.Results: A total of 109 participants (49%) responded to the questionnaire. The majority (69-94%) perceived very good participation/autonomy in all domains and 59% were working 5 years after stroke. Working was a significant predictor of high participation/autonomy in all domains of the questionnaire.Conclusions: Being able to return to work after a stroke seems to be important for self-perceived participation/autonomy. This emphasizes the importance of work-oriented information and rehabilitation after a stroke at working age.Implications for rehabilitationThe current study shows that the majority report high self-perceived participation and autonomy in everyday life and 59% are working 5 years after a stroke in working age.To work 5 years after a stroke was a significant predictor for self-perceived participation and autonomy in everyday life.Since stroke is becoming more common among working age persons and work seem important for perceived participation and autonomy, to optimize the return to work by for instance work-oriented information and vocational rehabilitation is important.

Long-term participation 7-8 years after stroke: Experiences of people in working-age

Objective

To enhance the understanding of long-term participation in working-aged people 7–8 years after stroke.

Methods

This study had a qualitative design, using a thematic analysis methodology. Eleven individuals took part in an in depth interview 7–8 years after a first time stroke. They had received care at the Sahlgrenska University Hospital in Gothenburg, and were recruited as a heterogenic sample with respect to age, gender, stroke severity and subtype.

Results

From the participants’ experiences four themes emerged: “Returning to work after stroke”; “Working life 7–8 years after stroke”; “Social life 7–8 years after stroke”; and “A state of reorientation in life”. Quotes about experienced participation in everyday life were summarized and presented as “Participation after stroke narratives”. Participants chose to emphasize on work- and social life when describing situations of successful participation. Being included in the wider community and having a sense of purpose, when interacting with others, were factors that these narratives had in common. Participants had gradually become accustomed to a somewhat altered life situation. Some consequences after stroke were still considered frustrating in social or work situations. However, the importance of these issues had reduced and were no longer problematized.

Conclusions

Participants felt content with their everyday life in general, which was a principal and positive result of this study. Reaching a stage of acceptance seemed to be a complex and continuous struggle, and an individual approach in long-term rehabilitation would be valuable to support this personal process. More knowledge about what factors that facilitate participation in people of working-age many years after stroke is needed, so that more people can reach a state of positive identity and participation.

Occupational gaps 5 years after stroke

OBJECTIVES

To investigate the incidence and number of occupational gaps 5 years after stroke and find possible predictors and explanatory factors for increased number of experienced gaps.

MATERIAL AND METHODS

The participants were diagnosed with first-time stroke in Gothenburg during 2009-2010. Medical records from their hospital stay were used to obtain baseline data. The Occupational Gaps Questionnaire and the Swedish stroke registers follow-up questionnaire were sent out. Data from the Occupational Gaps Questionnaire were used as a dependent variable and baseline data and questions from the stroke registry were used as independent variables in logistic regression.

RESULTS

Five years poststroke, 49.5% experienced a higher number of occupational gaps compared to a healthy reference population. Predictors for an increased number of gaps were higher age at stroke onset and a higher degree of functional dependency. Explanatory factors for an increased number of gaps in the study population were higher age at follow-up and feelings of depression.

CONCLUSIONS

Older age at the time of stroke and functional dependency can predict an increased number of occupational gaps. Older age and feelings of depression are connected to an increased number of occupational gaps. Individuals at risk should be provided with additional interventions to reduce participation restrictions.

‘Plug and pipe’ strategy for treatment of ruptured intracranial aneurysms

Background

Aneurysmal subarachnoid hemorrhage is a potentially devastating condition, and among the first priorities of treatment is aneurysm occlusion to prevent re-hemorrhage. An emerging strategy to treat patients whose aneurysms are not ideal for surgical or endovascular treatment is subtotal coiling followed by flow diversion in the recovery phase or ‘plug and pipe’. However, data regarding the safety and efficacy of this strategy are lacking.

Methods

A retrospective cohort study was performed to evaluate the efficacy and safety of ‘plug and pipe’. All patients with a ruptured intracranial aneurysm intentionally, subtotally treated by coiling in the acute stage followed by flow diversion after recovery, were included. The primary outcome was re-hemorrhage. Secondary outcomes included aneurysm occlusion and functional status. Complications were reviewed.

Results

22 patients were included. No patient suffered a re-hemorrhage, either in the interval between coiling and flow diversion or in follow-up. The median interval between aneurysm rupture and flow diversion was 3.5 months. Roy–Raymond (R-R) class I or II occlusion was achieved in 91% of target aneurysms at the last imaging follow-up (15/22(68%) R-R 1 and 5/22(23%) R-R 2). Complications occurred in 2 (9%) patients, 1 of which was neurological.

Conclusions

Overall, these data suggest that subtotal coiling of ruptured intracranial aneurysms followed by planned flow diversion is both safe and effective. Patients who may most benefit from ‘plug and pipe’ are those with aneurysms that confer high operative risk and those whose severity of medical illness increases the risk of microsurgical clip ligation.

Life situation 5 years after subarachnoid haemorrhage

OBJECTIVES

Subarachnoid haemorrhage (SAH) has high mortality and morbidity among survivors. SAH mainly affects young people and may result in long-term disabilities such as decreased Health-related Quality of Life (HRQoL), mental health and cognitive function. The aim of this study was to investigate the life situation 5 years after a SAH including physical/emotional status, participation and HRQoL.

MATERIALS & METHODS

In this cross-sectional descriptive study, a mail survey was sent to all persons treated at a neurosurgery unit in Gothenburg, Sweden, for non-traumatic SAH in 2009-2010, approximately 5 years post-SAH. The survey included questions regarding HRQoL; EuroQol 5-Dimensions (EQ-5D), the impact of the SAH; Stroke Impact Scale (SIS), Occupational Gaps Questionnaire and participation in society; Impact of Participation and Autonomy (IPA).

RESULTS

Forty-two 5 year survivors were sent the survey, of whom 26 (62%) responded (59 years old, range 33-85). The participants had generally low HRQoL and scored low in the domain of anxiety and depression. Many reported problems with emotions, fatigue, memory and executive function, but few problems with physical condition. However, nearly all participants reported to have an acceptable level of participation and 64% were independent in their daily life.

CONCLUSIONS

In this 5-year follow-up after SAH, the participants reported to have a greater number of hidden disabilities compared to physical problems, whereas most had acceptable participation in society. A yearly follow-up after a SAH could be suggested aiming to improving the cognitive and mental health.

Consequences and coping strategies six years after a subarachnoid hemorrhage - A qualitative study

Background

After a subarachnoid haemorrhage (SAH), continuing impairment is common and may impact the person’s life. There is a lack of knowledge regarding long-term consequences experienced.

Purpose

To explore experiences of the care and rehabilitation as well as the consequences and strategies used to cope with everyday life six years post SAH.

Methods

An explorative interview study with a qualitative design. Individual interviews, with open ended questions, using an interview guide were performed with sixteen participants (mean age 63, 8 men, 8 women) six years post SAH. Data was analyzed according to a descriptive thematic analysis, and themes were discovered inductively.

Results

Two major themes from the analysis, both including four sub-themes, were identified; these themes were consequences of the SAH and coping strategies. Participants were grateful to have survived the SAH and most were satisfied with their acute medical care. If discharged directly from the neurosurgical unit participants can feel abandoned. In contrast, participants who were referred to a rehabilitation clinic felt supported and informed. Cognitive problems, such as impaired memory and mental fatigue, were reported as still present six years post SAH. Coping strategies were; receiving support from family, society, employers, or technical equipment. At work, talking to colleagues and to taking breaks were common. Participants described hiding their symptoms from employers and friends, as well as trying to continue doing tasks in the same manner as prior to the SAH. If this was not possible, some refrained from doing these tasks. They went through a mourning process, fear, and worries.

Conclusions

Participants reported several long-term consequences which impacted on their daily lives post SAH, and different coping strategies were used to cope with these problems. Participants reported lack of awareness regarding the consequences of SAH and stressed the importance of structured multidisciplinary follow-ups, which mostly is missing.