Interactions between cardiovascular and cerebrovascular disease

Recurrence and Mortality Risks in Patients with First Incident Acute Stroke or Myocardial Infarction: A Longitudinal Study Using the Korean National Health Insurance Service Database

Background: We aimed to identify the long-term risk of recurrence and mortality in patients who experienced acute ischemic stroke (AIS), acute myocardial infarction (AMI), or acute hemorrhagic stroke (AHS) using a population-level database. Methods: This retrospective cohort study included adults aged ≥55 years diagnosed with AIS, AMI, and AHS in the National Health Insurance Service Database between 2004 and 2007. The target outcomes were secondary AIS, AMI, AHS, and all-cause mortality. Predetermined covariates, such as age, sex, socioeconomic status, hypertension, diabetes, and dyslipidemia, were adjusted. Results: We included 151,181, 49,077, and 41,636 patients in the AIS, AHS, and AMI groups, respectively. The AMI (adjusted hazard ratio [aHR], 0.318; 95% confidence interval [CI], 0.306−0.330; p < 0.001) and AHS (aHR, 0.489; 95% CI, 0.472−0.506; p < 0.001) groups had a significantly lower risk of developing secondary AIS than the AIS group. The risk of developing secondary AMI was significantly lower in the AMI (aHR, 0.388; 95% CI, 0.348−0.433; p < 0.001) and AHS (aHR, 0.711; 95% CI, 0.640−0.790; p < 0.001) groups than in the AIS group. Initial AHS was a decisive risk factor for secondary AHS (aHR, 8.546; 95% CI, 8.218−8.887; p < 0.001). The AMI (aHR, 1.436; 95% CI, 1.412−1.461; p < 0.001) and AHS (aHR, 1.328; 95% CI, 1.309−1.348; p < 0.001) groups were associated with a significantly higher risk of long-term mortality than the AIS group. Conclusion: Our results elucidated that initial AIS was a significant risk factor for recurrent AIS and AMI; initial AHS was a decisive risk factor for developing secondary AHS. Further, AMI and AHS were more closely related to long-term mortality than AIS.

Inclusion of stroke patients in expanded cardiac rehabilitation services: a cross-national qualitative study with cardiac and stroke rehabilitation professionals

PURPOSE

This qualitative study explored healthcare professionals' views in relation to the potential expansion of cardiac rehabilitation services to include stroke patients, thereby becoming a cardiovascular rehabilitation model.

DESIGN AND METHODS

23 semi-structured interviews were completed with hospital and community-based stroke and cardiac rehabilitation professionals in Switzerland (n = 7) and Ireland (n = 19). The sample comprised physiotherapists, occupational therapists, speech and language therapists, stroke physicians, cardiologists, psychologists, dieticians and nurses. Interviews were audio-recorded and the transcripts were analysed in NVivo using inductive Thematic Analysis.

RESULTS

Barriers and facilitators to cardiovascular rehabilitation were captured under four broad themes; (i) Cardiac rehabilitation as "low-hanging fruit," (ii) Cognitive impairment ("the elephant in the room"), (iii) Adapted cardiac rehabilitation for mild stroke, and (iv) Resistance to change.

CONCLUSIONS

Hybrid cardiac rehabilitation programmes could be tailored to deliver stroke-specific education, exercises and multidisciplinary expertise. Post-stroke cognitive impairment was identified as a key barrier to participation in cardiac rehabilitation. A cognitive rehabilitation intervention could potentially be delivered as part of cardiac rehabilitation, to address the cognitive needs of stroke and cardiac patients.Implications for rehabilitationThe cardiac rehabilitation model has the potential to be expanded to include mild stroke patients given the commonality of secondary prevention needs.Up to half of stroke survivors are affected by post-stroke cognitive impairment, consequently mild stroke patients may not be such an "easy fit" for cardiac rehabilitation.A cardiovascular programme which includes common rehabilitation modules, in addition to stroke- and cardiac-specific content is recommended.A cognitive rehabilitation module could potentially be added as part of the cardiac rehabilitation programme to address the cognitive needs of stroke and cardiac patients.

Overexpression of miRNA-9 Generates Muscle Hypercontraction Through Translational Repression of Troponin-T in Drosophila melanogaster Indirect Flight Muscles

MicroRNAs (miRNAs) are small noncoding endogenous RNAs, typically 21-23 nucleotides long, that regulate gene expression, usually post-transcriptionally, by binding to the 3'-UTR of target mRNA, thus blocking translation. The expression of several miRNAs is significantly altered during cardiac hypertrophy, myocardial ischemia, fibrosis, heart failure, and other cardiac myopathies. Recent studies have implicated miRNA-9 (miR-9) in myocardial hypertrophy. However, a detailed mechanism remains obscure. In this study, we have addressed the roles of miR-9 in muscle development and function using a genetically tractable model system, the indirect flight muscles (IFMs) of Drosophila melanogaster Bioinformatics analysis identified 135 potential miR-9a targets, of which 27 genes were associated with Drosophila muscle development. Troponin-T (TnT) was identified as major structural gene target of miR-9a. We show that flies overexpressing miR-9a in the IFMs have abnormal wing position and are flightless. These flies also exhibit a loss of muscle integrity and sarcomeric organization causing an abnormal muscle condition known as "hypercontraction." Additionally, miR-9a overexpression resulted in the reduction of TnT protein levels while transcript levels were unaffected. Furthermore, muscle abnormalities associated with miR-9a overexpression were completely rescued by overexpression of TnT transgenes which lacked the miR-9a binding site. These findings indicate that miR-9a interacts with the 3'-UTR of the TnT mRNA and downregulates the TnT protein levels by translational repression. The reduction in TnT levels leads to a cooperative downregulation of other thin filament structural proteins. Our findings have implications for understanding the cellular pathophysiology of cardiomyopathies associated with miR-9 overexpression.

Optimising secondary prevention in the acute period following a TIA of ischaemic origin

Background

Transient ischaemic attacks (TIAs) are highly prevalent conditions, with at least 46 000 people per year in the UK having a TIA for the first time. TIAs are a warning that the patient is at risk of further vascular events and the 90-day risk of vascular events following a TIA, excluding events within the first week after diagnosis when the risk is highest, can be as high as 18%. Immediate assessment of patients with TIA, either at accident and emergency, general practice and/or TIA clinics, is therefore required to address secondary prevention and prevent further vascular events.

Discussion

This article addresses the need for optimising secondary prevention in the acute period following a TIA of ischaemic origin to reduce the risk of further vascular events as per recent Cochrane review advice and presents a novel project, Stroke Prevention Rehabilitation Intervention Trial of Exercise (SPRITE), to do this.

Summary

One novel way to tackle vascular risk factors and promote secondary prevention in patients with TIA could be to adapt a cardiac rehabilitation programme for these patients. SPRITE, a feasibility and pilot study (ClinicalTrials.gov Identifier: NCT02712385) funded by the National Institute for Health Research, is attempting to adapt a home-based cardiac rehabilitation programme, 'The Healthy Brain Rehabilitation Manual', for use in the acute period following a TIA. The use of cardiac rehabilitation programmes post-TIA requires further research, particularly within the primary care setting.

Systematic review of rehabilitation programmes initiated within 90 days of a transient ischaemic attack or 'minor' stroke: a protocol

INTRODUCTION

Transient ischaemic attacks (TIAs) and strokes are highly prevalent conditions. Stroke killed 5.7 million people worldwide in 2005 and is estimated to cause 6.5 million deaths globally in 2015. Stroke survivors are often left with considerable disability. Many strokes are preceded by a TIA/'minor' stroke in the previous 90 days and therefore the immediate period after a TIA/minor' stroke is a crucial time to intervene to tackle known vascular risk factors. Although rehabilitation following a TIA/minor stroke is widely recommended, there is a paucity of research that offers an evidence base on which the development or optimisation of interventions can be based, particularly for home-based approaches and non-pharmacological interventions in the acute period following the initial TIA/'minor' stroke. This systematic review will investigate the effect of rehabilitation programmes initiated within 90 days of the diagnosis of a TIA or 'minor' stroke aimed at reducing the subsequent risk of stroke.

METHODS/DESIGN

This systematic review will be reported in line with the Preferred Reporting Items for Systematic Reviews and Meta-analyses(PRISMA) guidance. Randomised and quasi-randomised controlled trials of rehabilitation programmes initiated within 90 days of a TIA or 'minor' stroke will be included. Articles will be identified through a comprehensive search of the following databases, guided by a medical librarian: the Cochrane Library, Web of Science, MEDLINE, Embase, CINAHL and PsycINFO. Two review authors will independently screen articles retrieved from the search for eligibility and extract relevant data on methodological issues. A narrative synthesis will be completed when there is insufficient data to permit a formal meta-analysis.

DISCUSSION

This review will be of value to clinicians and healthcare professionals working in TIA and stroke services as well as to general practitioners/family physicians who care for these patients in the community and to researchers involved in designing and evaluating rehabilitation interventions.

TRIAL REGISTRATION NUMBER

CRD42015016450.