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Kilkenny MF, Lannin NA, Levi C, Faux SG, Dewey HM, Grimley R, Hill K, Grabsch B, Kim J, Hand P, Crosby V, Gardner M, Rois-Gnecco J, Thijs V, Anderson CS, Donnan G, Middleton S, Cadilhac DA. Weekend hospital discharge is associated with suboptimal care and outcomes: An observational Australian Stroke Clinical Registry study. Int J Stroke 2018; 14:430-438. [PMID: 30346259 DOI: 10.1177/1747493018806165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The quality of stroke care may diminish on weekends. AIMS We aimed to compare the quality of care and outcomes for patients with stroke/transient ischemic attack discharged on weekdays compared with those discharged on weekends. METHODS Data from the Australian Stroke Clinical Registry from January 2010 to December 2015 (n = 45 hospitals) were analyzed. Differences in processes of care by the timing of discharge are described. Multilevel regression and survival analyses (up to 180 days postevent) were undertaken. RESULTS Among 30,649 registrants, 2621 (8.6%) were discharged on weekends (55% male; median age 74 years). Compared to those discharged on weekdays, patients discharged on weekends were more often patients with a transient ischemic attack (weekend 35% vs. 19%; p < 0.001) but were less often treated in a stroke unit (69% vs. 81%; p < 0.001), prescribed antihypertensive medication at discharge (65% vs. 71%; p < 0.001) or received a care plan if discharged to the community (47% vs. 53%; p < 0.001). After accounting for patient characteristics and clustering by hospital, patients discharged on weekends had a 1 day shorter length of stay (coefficient = -1.31, 95% confidence interval [CI] = -1.52, -1.10), were less often discharged to inpatient rehabilitation (aOR = 0.39, 95% CI = 0.34, 0.44) and had a greater hazard of death within 180 days (hazard ratio = 1.22, 95% CI = 1.04, 1.42) than those discharged on weekdays. CONCLUSIONS Patients with stroke/transient ischemic attack discharged on weekends were more likely to receive suboptimal care and have higher long-term mortality. High quality of stroke care should be consistent irrespective of the timing of hospital discharge.
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Muller C, Cheung NW, Dewey H, Churilov L, Middleton S, Thijs V, Ekinci EI, Levi C, Lindley R, Donnan G, Parsons M, Bladin C. Treatment with exenatide in acute ischemic stroke trial protocol: A prospective, randomized, open label, blinded end-point study of exenatide vs. standard care in post stroke hyperglycemia. Int J Stroke 2018; 13:857-862. [PMID: 30019627 DOI: 10.1177/1747493018784436] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Rationale Post-stroke hyperglycemia occurs in up to 50% of patients presenting with acute ischemic stroke. It reduces the efficacy of thrombolysis, increases infarct size, and worsens clinical outcomes. Insulin-based therapies have generally not been beneficial in treating post-stroke hyperglycemia as they are difficult to implement, may cause hypoglycaemia, possibly increase mortality and worsen clinical outcomes. Exenatide may be a safer, simpler, and more effective alternative to insulin in acute ischemic stroke. Design TEXAIS is a three year, Phase 2, multi-center, prospective, randomized, open label, blinded end-point trial comparing exenatide to standard of care. It aims to recruit 528 patients with a primary end point of major neurological improvement at 7 days defined as a ≥8-point improvement in NIHSS score, or NIHSS 0-1. Secondary outcomes of hyper- and hypoglycaemia at 5 days and NIHSS and mRS at 90 days will be measured. The treatment arm will receive exenatide 5 µg subcutaneously twice daily. The control arm will receive standard stroke unit care. Continuous glucose monitors will track the dynamic variability of glucose. Conclusion TEXAIS aims to show that exenatide is safe and effective in the treatment of post-stroke hyperglycemia. It has been designed to be highly generalizable with an ability to enroll a large percentage of patients with acute ischemic stroke, regardless of admission blood glucose level, diabetes status, or stroke severity, with very low risk of hypoglycemia. Trial registration: ClinicalTrials.gov/ANZCTR NTA1127.
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Levi C, Lillicrap T, Harman S, Draxler D, Niego B, Ho H, McCutcheon F, Kleinig T, Koblar S, Hamilton-Bruce MA, Garcia-Esperon C, Lincz L, Bivard A, Attia J, Maguire J, Holliday E, Medcalf R. 011 Ex-vivo generation of plasmin from patients with acute ischaemic stroke is predictive of successful thrombolysis. J Neurol Psychiatry 2018. [DOI: 10.1136/jnnp-2018-anzan.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
IntroductionThrombolysis with recombinant tissue-type plasminogen activator (rt-PA) fails in more than 60% of patients with acute ischaemic stroke (AIS). Simultaneously, there are risks associated with the use of rt-PA, including the risk of symptomatic intracranial haemorrhage (sICH) even in patients who do re-canalise. While thrombus location, aetiology and infarct size can affect the likelihood of successful thrombolysis, other factors distinguishing patients who re-canalise from those who don’t have yet to be fully elucidated. The ability of rt-PA to promote thrombolysis is dependent upon its capacity to generate plasmin, and we set out to test this capacity ex-vivo. We hypothesised that patients with low plasmin generating capacity are less likely to re-canalise following rt-PA treatment.MethodsPlasma was obtained from 90 AIS patients up to 1 hour before thrombolysis and screened for baseline levels of plasminogen, anti-plasmin, and plasmin-anti-plasmin (PAP) complexes. The degree of inducible plasmin generation was determined using amidolytic assays following ex-vivo addition of rt-PA for 1 hour. ELISA assays were also used to quantitate the fold-increase in PAP complex levels after rt-PA treatment.Resultsrt-PA inducible PAP levels, a surrogate for the capacity to generate plasmin from plasminogen, varied dramatically between patients. The ratio of post-thrombolysis PAP to pre-thrombolysis PAP ranged from 3.4 to 105.9 within the cohort examined for this study. Multivariate regression analyses revealed that each fold increase in PAP levels was associated with a 4.2% increase in the odds of recanalisation (p=0,035) when corrected for blood glucose levels.ConclusionThis is the first report of ex vivo-inducible plasmin generation as a predictor of thrombolysis. The predictive power of this screening assay for sICH is still under investigation.
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Kilkenny MF, Lannin NA, Anderson CS, Dewey HM, Kim J, Barclay-Moss K, Levi C, Faux S, Hill K, Grabsch B, Middleton S, Thrift AG, Grimley R, Donnan G, Cadilhac DA. Quality of Life Is Poorer for Patients With Stroke Who Require an Interpreter: An Observational Australian Registry Study. Stroke 2018; 49:761-764. [PMID: 29439194 DOI: 10.1161/strokeaha.117.019771] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 12/13/2017] [Accepted: 12/15/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE In multicultural Australia, some patients with stroke cannot fully understand, or speak, English. Language barriers may reduce quality of care and consequent outcomes after stroke, yet little has been reported empirically. METHODS An observational study of patients with stroke or transient ischemic attack (2010-2015) captured from 45 hospitals participating in the Australian Stroke Clinical Registry. The use of interpreters in hospitals, which is routinely documented, was used as a proxy for severe language barriers. Health-Related Quality of Life was assessed using the EuroQoL-5 dimension-3 level measured 90 to 180 days after stroke. Logistic regression was undertaken to assess the association between domains of EuroQoL-5 dimension and interpreter status. RESULTS Among 34 562 registrants, 1461 (4.2%) required an interpreter. Compared with patients without interpreters, patients requiring an interpreter were more often women (53% versus 46%; P<0.001), aged ≥75 years (68% versus 51%; P<0.001), and had greater access to stroke unit care (85% versus 78%; P<0.001). After accounting for patient characteristics and stroke severity, patients requiring interpreters had comparable discharge outcomes (eg, mortality, discharged to rehabilitation) to patients not needing interpreters. However, these patients reported poorer Health-Related Quality of Life (visual analogue scale coefficient, -9; 95% CI, -12.38, -5.62), including more problems with self-care (odds ratio: 2.22; 95% CI, 1.82, 2.72), pain (odds ratio: 1.84; 95% CI, 1.52, 2.34), anxiety or depression (odds ratio: 1.60; 95% CI, 1.33, 1.93), and usual activities (odds ratio: 1.62; 95% CI, 1.32, 2.00). CONCLUSIONS Patients requiring interpreters reported poorer Health Related Quality of Life after stroke/transient ischemic attack despite greater access to stroke units. These findings should be interpreted with caution because we are unable to account for prestroke Health Related Quality of Life. Further research is needed.
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Wong R, Al-Omary M, Spratt N, Howe P, Levi C, Boyle A, Collins N. Neurovascular Function and Cognition in Adult Patients With Complex Congenital Heart Disease. Heart Lung Circ 2018. [DOI: 10.1016/j.hlc.2018.06.804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Craig LE, Taylor N, Grimley R, Cadilhac DA, McInnes E, Phillips R, Dale S, O'Connor D, Levi C, Fitzgerald M, Considine J, Grimshaw JM, Gerraty R, Cheung NW, Ward J, Middleton S. Development of a theory-informed implementation intervention to improve the triage, treatment and transfer of stroke patients in emergency departments using the Theoretical Domains Framework (TDF): the T 3 Trial. Implement Sci 2017; 12:88. [PMID: 28716152 PMCID: PMC5513365 DOI: 10.1186/s13012-017-0616-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 06/28/2017] [Indexed: 11/12/2022] Open
Abstract
Background Theoretical frameworks and models based on behaviour change theories are increasingly used in the development of implementation interventions. Development of an implementation intervention is often based on the available evidence base and practical issues, i.e. feasibility and acceptability. The aim of this study was to describe the development of an implementation intervention for the T3 Trial (Triage, Treatment and Transfer of patients with stroke in emergency departments (EDs)) using theory to recommend behaviour change techniques (BCTs) and drawing on the research evidence base and practical issues of feasibility and acceptability. Methods A stepped method for developing complex interventions based on theory, evidence and practical issues was adapted using the following steps: (1) Who needs to do what, differently? (2) Using a theoretical framework, which barriers and enablers need to be addressed? (3) Which intervention components (behaviour change techniques and mode(s) of delivery) could overcome the modifiable barriers and enhance the enablers? A researcher panel was convened to review the list of BCTs recommended for use and to identify the most feasible and acceptable techniques to adopt. Results Seventy-six barriers were reported by hospital staff who attended the workshops (step 1: thirteen TDF domains likely to influence the implementation of the T3 Trial clinical intervention were identified by the researchers; step 2: the researcher panellists then selected one third of the BCTs recommended for use as appropriate for the clinical context of the ED and, using the enabler workshop data, devised enabling strategies for each of the selected BCTs; and step 3: the final implementation intervention consisted of 27 BCTs). Conclusions The TDF was successfully applied in all steps of developing an implementation intervention for the T3 Trial clinical intervention. The use of researcher panel opinion was an essential part of the BCT selection process to incorporate both research evidence and expert judgment. It is recommended that this stepped approach (theory, evidence and practical issues of feasibility and acceptability) is used to develop highly reportable implementation interventions. The classifying of BCTs using recognised implementation intervention components will facilitate generalisability and sharing across different conditions and clinical settings. Electronic supplementary material The online version of this article (doi:10.1186/s13012-017-0616-6) contains supplementary material, which is available to authorized users.
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Traylor M, Malik R, Nalls MA, Cotlarciuc I, Radmanesh F, Thorleifsson G, Hanscombe KB, Langefeld C, Saleheen D, Rost NS, Yet I, Spector TD, Bell JT, Hannon E, Mill J, Chauhan G, Debette S, Bis JC, Longstreth WT, Ikram MA, Launer LJ, Seshadri S, Hamilton-Bruce MA, Jimenez-Conde J, Cole JW, Schmidt R, Słowik A, Lemmens R, Lindgren A, Melander O, Grewal RP, Sacco RL, Rundek T, Rexrode K, Arnett DK, Johnson JA, Benavente OR, Wasssertheil-Smoller S, Lee JM, Pulit SL, Wong Q, Rich SS, de Bakker PIW, McArdle PF, Woo D, Anderson CD, Xu H, Heitsch L, Fornage M, Jern C, Stefansson K, Thorsteinsdottir U, Gretarsdottir S, Lewis CM, Sharma P, Sudlow CLM, Rothwell PM, Boncoraglio GB, Thijs V, Levi C, Meschia JF, Rosand J, Kittner SJ, Mitchell BD, Dichgans M, Worrall BB, Markus HS. Genetic variation at 16q24.2 is associated with small vessel stroke. Ann Neurol 2017; 81:383-394. [PMID: 27997041 PMCID: PMC5366092 DOI: 10.1002/ana.24840] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 12/02/2016] [Accepted: 12/03/2016] [Indexed: 02/03/2023]
Abstract
Objective Genome‐wide association studies (GWAS) have been successful at identifying associations with stroke and stroke subtypes, but have not yet identified any associations solely with small vessel stroke (SVS). SVS comprises one quarter of all ischemic stroke and is a major manifestation of cerebral small vessel disease, the primary cause of vascular cognitive impairment. Studies across neurological traits have shown that younger‐onset cases have an increased genetic burden. We leveraged this increased genetic burden by performing an age‐at‐onset informed GWAS meta‐analysis, including a large younger‐onset SVS population, to identify novel associations with stroke. Methods We used a three‐stage age‐at‐onset informed GWAS to identify novel genetic variants associated with stroke. On identifying a novel locus associated with SVS, we assessed its influence on other small vessel disease phenotypes, as well as on messenger RNA (mRNA) expression of nearby genes, and on DNA methylation of nearby CpG sites in whole blood and in the fetal brain. Results We identified an association with SVS in 4,203 cases and 50,728 controls on chromosome 16q24.2 (odds ratio [OR; 95% confidence interval {CI}] = 1.16 [1.10–1.22]; p = 3.2 × 10−9). The lead single‐nucleotide polymorphism (rs12445022) was also associated with cerebral white matter hyperintensities (OR [95% CI] = 1.10 [1.05–1.16]; p = 5.3 × 10−5; N = 3,670), but not intracerebral hemorrhage (OR [95% CI] = 0.97 [0.84–1.12]; p = 0.71; 1,545 cases, 1,481 controls). rs12445022 is associated with mRNA expression of ZCCHC14 in arterial tissues (p = 9.4 × 10−7) and DNA methylation at probe cg16596957 in whole blood (p = 5.3 × 10−6). Interpretation 16q24.2 is associated with SVS. Associations of the locus with expression of ZCCHC14 and DNA methylation suggest the locus acts through changes to regulatory elements. Ann Neurol 2017;81:383–394
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Middleton S, Coughlan K, Mnatzaganian G, Low Choy N, Dale S, Jammali-Blasi A, Levi C, Grimshaw JM, Ward J, Cadilhac DA, McElduff P, Hiller JE, D’Este C. Mortality Reduction for Fever, Hyperglycemia, and Swallowing Nurse-Initiated Stroke Intervention. Stroke 2017; 48:1331-1336. [DOI: 10.1161/strokeaha.116.016038] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 02/02/2017] [Accepted: 02/08/2017] [Indexed: 11/16/2022]
Abstract
Background and Purpose—
Implementation of nurse-initiated protocols to manage fever, hyperglycemia, and swallowing dysfunction decreased death and disability 90 days poststroke in the QASC trial (Quality in Acute Stroke Care) conducted in 19 Australian acute stroke units (2005–2010). We now examine long-term all-cause mortality.
Methods—
Mortality was ascertained using Australia’s National Death Index. Cox proportional hazards regression compared time to death adjusting for correlation within stroke units using the cluster sandwich (Huber–White estimator) method. Primary analyses included treatment group only unadjusted for covariates. Secondary analysis adjusted for age, sex, marital status, education, and stroke severity using multiple imputation for missing covariates.
Results—
One thousand and seventy-six participants (intervention n=600; control n=476) were followed for a median of 4.1 years (minimum 0.3 to maximum 70 months), of whom 264 (24.5%) had died. Baseline demographic and clinical characteristics were generally well balanced by group. The QASC intervention group had improved long-term survival (>20%), but this was only statistically significant in adjusted analyses (unadjusted hazard ratio [HR], 0.79; 95% confidence interval [CI], 0.58–1.07;
P
=0.13; adjusted HR, 0.77; 95% CI, 0.59–0.99;
P
=0.045). Older age (75–84 years; HR, 4.9; 95% CI, 2.8–8.7;
P
<0.001) and increasing stroke severity (HR, 1.5; 95% CI, 1.3–1.9;
P
<0.001) were associated with increased mortality, while being married (HR, 0.70; 95% CI, 0.49–0.99;
P
=0.042) was associated with increased likelihood of survival. Cardiovascular disease (including stroke) was listed either as the primary or secondary cause of death in 80% (211/264) of all deaths.
Conclusions—
Our results demonstrate the potential long-term and sustained benefit of nurse-initiated multidisciplinary protocols for management of fever, hyperglycemia, and swallowing dysfunction. These protocols should be a routine part of acute stroke care.
Clinical Trial Registration—
URL:
http://www.anzctr.org.au
. Unique identifier: ACTRN12608000563369.
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Callister R, Dunn A, Marsden D, van Vliet P, Levi C, Spratt N. Improvements in fitness at 12-months follow up of an individualised home and community based exercise program after stroke. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2016.12.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Middleton S, Levi C, Dale S, Cheung NW, McInnes E, Considine J, D’Este C, Cadilhac DA, Grimshaw J, Gerraty R, Craig L, Schadewaldt V, McElduff P, Fitzgerald M, Quinn C, Cadigan G, Denisenko S, Longworth M, Ward J. Triage, treatment and transfer of patients with stroke in emergency department trial (the T 3 Trial): a cluster randomised trial protocol. Implement Sci 2016; 11:139. [PMID: 27756434 PMCID: PMC5069775 DOI: 10.1186/s13012-016-0503-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 10/07/2016] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Internationally recognised evidence-based guidelines recommend appropriate triage of patients with stroke in emergency departments (EDs), administration of tissue plasminogen activator (tPA), and proactive management of fever, hyperglycaemia and swallowing before prompt transfer to a stroke unit to maximise outcomes. We aim to evaluate the effectiveness in EDs of a theory-informed, nurse-initiated, intervention to improve multidisciplinary triage, treatment and transfer (T3) of patients with acute stroke to improve 90-day death and dependency. Organisational and contextual factors associated with intervention uptake also will be evaluated. METHODS This prospective, multicentre, parallel group, cluster randomised trial with blinded outcome assessment will be conducted in EDs of hospitals with stroke units in three Australian states and one territory. EDs will be randomised 1:1 within strata defined by state and tPA volume to receive either the T3 intervention or no additional support (control EDs). Our T3 intervention comprises an evidence-based care bundle targeting: (1) triage: routine assignment of patients with suspected stroke to Australian Triage Scale category 1 or 2; (2) treatment: screening for tPA eligibility and administration of tPA where applicable; instigation of protocols for management of fever, hyperglycaemia and swallowing; and (3) transfer: prompt admission to the stroke unit. We will use implementation science behaviour change methods informed by the Theoretical Domains Framework [1, 2] consisting of (i) workshops to determine barriers and local solutions; (ii) mixed interactive and didactic education; (iii) local clinical opinion leaders; and (iv) reminders in the form of email, telephone and site visits. Our primary outcome measure is 90 days post-admission death or dependency (modified Rankin Scale >2). Secondary outcomes are health status (SF-36), functional dependency (Barthel Index), quality of life (EQ-5D); and quality of care outcomes, namely, monitoring and management practices for thrombolysis, fever, hyperglycaemia, swallowing and prompt transfer. Outcomes will be assessed at the patient level. A separate process evaluation will examine contextual factors to successful intervention uptake. At the time of publication, EDs have been randomised and the intervention is being implemented. DISCUSSION This theoretically informed intervention is aimed at addressing important gaps in care to maximise 90-day health outcomes for patients with stroke. TRIAL REGISTRATION Australian and New Zealand Clinical Trials Registry ACTRN12614000939695 . Registered 2 September 2014.
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Gardner A, Kohler R, Levi C, Iverson G. Usefulness of Video Review of Possible Concussions in National Youth Rugby League. Int J Sports Med 2016; 38:71-75. [DOI: 10.1055/s-0042-116072] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Collins N, Ahmad W, Davies A, Boyle A, Spratt N, Levi C, Howe P, Wong R. Assessment of Cerebral Blood Flow in Adult Patients With Aortic Coarctation. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Traylor M, Rutten-Jacobs LCA, Thijs V, Holliday EG, Levi C, Bevan S, Malik R, Boncoraglio G, Sudlow C, Rothwell PM, Dichgans M, Markus HS. Genetic Associations With White Matter Hyperintensities Confer Risk of Lacunar Stroke. Stroke 2016; 47:1174-9. [PMID: 27073246 PMCID: PMC4839546 DOI: 10.1161/strokeaha.115.011625] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 03/09/2016] [Indexed: 01/05/2023]
Abstract
Supplemental Digital Content is available in the text. Background and Purpose— White matter hyperintensities (WMH) are increased in patients with lacunar stroke. Whether this is because of shared pathogenesis remains unknown. Using genetic data, we evaluated whether WMH-associated genetic susceptibility factors confer risk of lacunar stroke, and therefore whether they share pathogenesis. Methods— We used a genetic risk score approach to test whether single nucleotide polymorphisms associated with WMH in community populations were associated with magnetic resonance imaging–confirmed lacunar stroke (n=1,373), as well as cardioembolic (n=1,331) and large vessel (n=1,472) Trial of Org 10172 in Acute Stroke Treatment subtypes, against 9,053 controls. Second, we separated lacunar strokes into those with WMH (n=568) and those without (n=787) and tested for association with the risk score in these 2 groups. In addition, we evaluated whether WMH-associated single nucleotide polymorphisms are associated with lacunar stroke, or in the 2 groups. Results— The WMH genetic risk score was associated with lacunar stroke (odds ratio [OR; 95% confidence interval [CI]]=1.14 [1.06–1.22]; P=0.0003), in patients both with and without WMH (WMH: OR [95% CI]=1.15 [1.05–1.26]; P=0.003 and no WMH: OR [95% CI]=1.11 [1.02–1.21]; P=0.019). Conversely, the risk score was not associated with cardioembolic stroke (OR [95% CI]=1.03 [0.97–1.09]; P=0.63) or large vessel stroke (OR [95% CI]=0.99 [0.93,1.04]; P=0.39). However, none of the WMH-associated single nucleotide polymorphisms passed Bonferroni-corrected significance for association with lacunar stroke. Conclusions— Genetic variants that influence WMH are associated with an increased risk of lacunar stroke but not cardioembolic or large vessel stroke. Some genetic susceptibility factors seem to be shared across different radiological manifestations of small vessel disease.
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Gardner A, Iverson G, Stanwell P, Moore T, Ellis J, Levi C. A Video Analysis of Use of the New ‘Concussion Interchange Rule’ in the National Rugby League. Int J Sports Med 2016; 37:267-73. [DOI: 10.1055/s-0035-1565203] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Traylor M, Rutten-Jacobs LCA, Holliday EG, Malik R, Sudlow C, Rothwell PM, Maguire JM, Koblar SA, Bevan S, Boncoraglio G, Dichgans M, Levi C, Lewis CM, Markus HS. Differences in Common Genetic Predisposition to Ischemic Stroke by Age and Sex. Stroke 2015; 46:3042-7. [PMID: 26443828 PMCID: PMC4617282 DOI: 10.1161/strokeaha.115.009816] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 08/04/2015] [Indexed: 11/28/2022]
Abstract
Supplemental Digital Content is available in the text. Evidence from epidemiological studies points to differences in factors predisposing to stroke by age and sex. Whether these arise because of different genetic influences remained untested. Here, we use data from 4 genome-wide association data sets to study the relationship between genetic influence on stroke with both age and sex.
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Anderson C, Lavado P, Sharma V, Huang Y, Thang NNH, Robinson T, Lee T, Kim J, Martins S, Pontes-Neto O, Lindley R, Levi C. Randomised evaluation of low-dose rtPA and intensive BP lowering in acute ischemic stroke: the enchanted trial. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.1310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Levi C, Frémeaux-Bacchi V, Rabant M, Scemla A, Zuber J, Legendre C, Sberro-Soussan R. Évolution de 11 patients ayant eu une transplantation rénale pour syndrome hémolytique et urémique atypique traités précocement par éculizumab. Nephrol Ther 2015. [DOI: 10.1016/j.nephro.2015.07.470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Thomas L, Levi C, Attia J, Rivett D. Recognition of patients presenting with or at risk of craniocervical arterial dissection: preliminary results of a prospective study. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Thomas L, Mackaroff A, Marquez J, Levi C. Seasonal variation in cervical artery dissection in the Hunter New England Region, New South Wales, Australia: a retrospective cohort study. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Joubert J, Davis SM, Hankey GJ, Levi C, Olver J, Gonzales G, Donnan GA. ICARUSS, the Integrated Care for the Reduction of Secondary Stroke trial: rationale and design of a randomized controlled trial of a multimodal intervention to prevent recurrent stroke in patients with a recent cerebrovascular event, ACTRN = 12611000264987. Int J Stroke 2015; 10:773-7. [PMID: 25907853 DOI: 10.1111/ijs.12510] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 02/18/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND The majority of strokes, both ischaemic and haemorrhagic, are attributable to a relatively small number of risk factors which are readily manageable in primary care setting. Implementation of best-practice recommendations for risk factor management is calculated to reduce stroke recurrence by around 80%. However, risk factor management in stroke survivors has generally been poor at primary care level. A model of care that supports long-term effective risk factor management is needed. AIM To determine whether the model of Integrated Care for the Reduction of Recurrent Stroke (ICARUSS) will, through promotion of implementation of best-practice recommendations for risk factor management reduce the combined incidence of stroke, myocardial infarction and vascular death in patients with recent stroke or transient ischaemic attack (TIA) of the brain or eye. DESIGN A prospective, Australian, multicentre, randomized controlled trial. SETTING Academic stroke units in Melbourne, Perth and the John Hunter Hospital, New South Wales. SUBJECTS 1000 stroke survivors recruited as from March 2007 with a recent (<3 months) stroke (ischaemic or haemorrhagic) or a TIA (brain or eye). RANDOMIZATION Randomization and data collection are performed by means of a central computer generated telephone system (IVRS). INTERVENTION Exposure to the ICARUSS model of integrated care or usual care. PRIMARY OUTCOME The composite of stroke, MI or death from any vascular cause, whichever occurs first. SECONDARY OUTCOMES Risk factor management in the community, depression, quality of life, disability and dementia. STATISTICAL POWER With 1000 patients followed up for a median of one-year, with a recurrence rate of 7-10% per year in patients exposed to usual care, the study will have at least 80% power to detect a significant reduction in primary end-points CONCLUSION The ICARUSS study aims to recruit and follow up patients between 2007 and 2013 and demonstrate the effectiveness of exposure to the ICARUSS model in stroke survivors to reduce recurrent stroke or vascular events and promote the implementation of best practice risk factor management at primary care level.
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Adib-Samii P, Devan W, Traylor M, Lanfranconi S, Zhang CR, Cloonan L, Falcone GJ, Radmanesh F, Fitzpatrick K, Kanakis A, Rothwell PM, Sudlow C, Boncoraglio GB, Meschia JF, Levi C, Dichgans M, Bevan S, Rosand J, Rost NS, Markus HS. Genetic architecture of white matter hyperintensities differs in hypertensive and nonhypertensive ischemic stroke. Stroke 2014; 46:348-53. [PMID: 25550368 PMCID: PMC4306538 DOI: 10.1161/strokeaha.114.006849] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Supplemental Digital Content is available in the text. Background and Purpose— Epidemiological studies suggest that white matter hyperintensities (WMH) are extremely heritable, but the underlying genetic variants are largely unknown. Pathophysiological heterogeneity is known to reduce the power of genome-wide association studies (GWAS). Hypertensive and nonhypertensive individuals with WMH might have different underlying pathologies. We used GWAS data to calculate the variance in WMH volume (WMHV) explained by common single nucleotide polymorphisms (SNPs) as a measure of heritability (SNP heritability [HSNP]) and tested the hypothesis that WMH heritability differs between hypertensive and nonhypertensive individuals. Methods— WMHV was measured on MRI in the stroke-free cerebral hemisphere of 2336 ischemic stroke cases with GWAS data. After adjustment for age and intracranial volume, we determined which cardiovascular risk factors were independent predictors of WMHV. Using the genome-wide complex trait analysis tool to estimate HSNP for WMHV overall and within subgroups stratified by risk factors found to be significant in multivariate analyses. Results— A significant proportion of the variance of WMHV was attributable to common SNPs after adjustment for significant risk factors (HSNP=0.23; P=0.0026). HSNP estimates were higher among hypertensive individuals (HSNP=0.45; P=7.99×10−5); this increase was greater than expected by chance (P=0.012). In contrast, estimates were lower, and nonsignificant, in nonhypertensive individuals (HSNP=0.13; P=0.13). Conclusions— A quarter of variance is attributable to common SNPs, but this estimate was greater in hypertensive individuals. These findings suggest that the genetic architecture of WMH in ischemic stroke differs between hypertensives and nonhypertensives. Future WMHV GWAS studies may gain power by accounting for this interaction.
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Ay H, Arsava EM, Andsberg G, Benner T, Brown RD, Chapman SN, Cole JW, Delavaran H, Dichgans M, Engström G, Giralt-Steinhauer E, Grewal RP, Gwinn K, Jern C, Jimenez-Conde J, Jood K, Katsnelson M, Kissela B, Kittner SJ, Kleindorfer DO, Labovitz DL, Lanfranconi S, Lee JM, Lehm M, Lemmens R, Levi C, Li L, Lindgren A, Markus HS, McArdle PF, Melander O, Norrving B, Peddareddygari LR, Pedersén A, Pera J, Rannikmäe K, Rexrode KM, Rhodes D, Rich SS, Roquer J, Rosand J, Rothwell PM, Rundek T, Sacco RL, Schmidt R, Schürks M, Seiler S, Sharma P, Slowik A, Sudlow C, Thijs V, Woodfield R, Worrall BB, Meschia JF. Pathogenic ischemic stroke phenotypes in the NINDS-stroke genetics network. Stroke 2014; 45:3589-96. [PMID: 25378430 PMCID: PMC4286169 DOI: 10.1161/strokeaha.114.007362] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 10/03/2014] [Indexed: 01/13/2023]
Abstract
BACKGROUND AND PURPOSE NINDS (National Institute of Neurological Disorders and Stroke)-SiGN (Stroke Genetics Network) is an international consortium of ischemic stroke studies that aims to generate high-quality phenotype data to identify the genetic basis of pathogenic stroke subtypes. This analysis characterizes the etiopathogenetic basis of ischemic stroke and reliability of stroke classification in the consortium. METHODS Fifty-two trained and certified adjudicators determined both phenotypic (abnormal test findings categorized in major pathogenic groups without weighting toward the most likely cause) and causative ischemic stroke subtypes in 16 954 subjects with imaging-confirmed ischemic stroke from 12 US studies and 11 studies from 8 European countries using the web-based Causative Classification of Stroke System. Classification reliability was assessed with blinded readjudication of 1509 randomly selected cases. RESULTS The distribution of pathogenic categories varied by study, age, sex, and race (P<0.001 for each). Overall, only 40% to 54% of cases with a given major ischemic stroke pathogenesis (phenotypic subtype) were classified into the same final causative category with high confidence. There was good agreement for both causative (κ 0.72; 95% confidence interval, 0.69-0.75) and phenotypic classifications (κ 0.73; 95% confidence interval, 0.70-0.75). CONCLUSIONS This study demonstrates that pathogenic subtypes can be determined with good reliability in studies that include investigators with different expertise and background, institutions with different stroke evaluation protocols and geographic location, and patient populations with different epidemiological characteristics. The discordance between phenotypic and causative stroke subtypes highlights the fact that the presence of an abnormality in a patient with stroke does not necessarily mean that it is the cause of stroke.
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Denis-Maurice Mac Carthy D, Franck N, Fichel F, Levi C, Dupin N. Le syndrome de Fanconi : un nouvel effet indésirable rénal induit par le vémurafénib. Ann Dermatol Venereol 2014. [DOI: 10.1016/j.annder.2014.09.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ensergueix G, Karras A, Levi C, Chauvet S, Trivin C, Augusto J, Boudet R, Aldigier J, Jacquot C, Nochy D, Essig M, Thervet E. Étude de la néphrotoxicité de l’ifosfamide chez l’adulte. Nephrol Ther 2014. [DOI: 10.1016/j.nephro.2014.07.217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Clerte M, Levi C, Touzot M, Fakhouri F, Durieux P, Charlin E, Huart A, Audard V, Daugas E, Mourad G, Thervet E, Karras A. Les vascularites « double-positives » : une forme rare et particulièrement sévère de vascularite systémique. Nephrol Ther 2014. [DOI: 10.1016/j.nephro.2014.07.168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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