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  • 1
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 34, No. 5-6 ( 2012), p. 343-350
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 The optimal treatment of asymptomatic carotid stenosis (ACS) is controversial. To optimize the risk-benefit ratio of carotid artery revascularization, it is crucial to identify ACS patients who are at increased stroke risk. Recent data suggest that plaque vulnerability depends on its composition. Therefore, we assessed plaque composition in ACS to determine predictors for ipsilateral cerebrovascular events. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 62 patients with 65 ACS ≥50% underwent 3-T MRI of the carotid bifurcation (TOF, special dark-blood weighted noncontrast and contrast-enhanced T 〈 sub 〉 1 〈 /sub 〉 and T 〈 sub 〉 2 〈 /sub 〉 images) and of the brain. The different plaque components (lipid core, intraplaque hemorrhage, calcification and the status of the fibrous cap) were assessed. Furthermore, the plaque volume and the volume of clinically silent cortical and subcortical infarcts in the territory of the stenosed carotid artery as seen on FLAIR images were determined by using a semi-automated software. Carotid stenosis was considered asymptomatic if there had not been any clinically apparent ischemic events in the corresponding vascular territory within the previous 6 months. During follow-up, information on the occurrence of cerebrovascular events, medical treatment and sonographic changes of the stenosis was collected. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 At baseline, 24 ACS (37%) were classified as high grade. A lipid-rich necrotic core was the dominant plaque component in 16 ACS (25%). The plaque volume was higher in ACS with a lipid-rich necrotic core as dominant plaque component (p = 0.002) and in patients with prior stroke/TIA (p = 0.010). After a median follow-up of 18.9 months (interquartile range 3.5–30.1) there were 2 ipsilateral strokes and 3 ipsilateral TIAs. The average annual event rate was 7.7%. A lipid-rich necrotic core (HR 7.21; 95% CI 1.12–46.28; p = 0.037), sonographic progression of the stenosis (HR 7.00; 95% CI 1.13–41.34; p = 0.036), history of stroke (HR 11.03; 95% CI 1.23–99.36; p = 0.032), and the volume of clinically asymptomatic ischemic brain lesions (HR 1.14/cm 〈 sup 〉 3 〈 /sup 〉 ; 95% CI 1.03–1.25; p = 0.008) predicted cerebrovascular events. Patients on statin therapy at follow-up were at lower risk of events (HR 0.17; 95% CI 0.03–1.00; p = 0.05). 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 In addition to medical history and sonographic findings, a lipid-rich necrotic core within the plaque turned out as a predictor of cerebrovascular events. Therefore, MR imaging of carotid plaques deserves further attention and might be helpful to improve risk stratification of asymptomatic carotid disease. The identified predictors could be combined in a risk model and tested in larger prospective studies.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2012
    detail.hit.zdb_id: 1482069-9
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  • 2
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 40, No. 5 ( 2009-05), p. 1729-1737
    Abstract: Background and Purpose— There are only limited data on whether prior statin use and/or cholesterol levels are associated with intracranial hemorrhage (ICH) and outcome after intra-arterial thrombolysis. The purpose of this study was to evaluate the association of statin pretreatment and cholesterol levels with the overall frequency of ICH, the frequency of symptomatic ICH, and clinical outcome at 3 months. Methods— We analyzed 311 consecutive patients (mean age, 63 years; 43% women) who received intra-arterial thrombolysis. Results— Statin pretreatment was present in 18%. The frequency of any ICH was 20.6% and of symptomatic ICH 4.8%. Patients with any ICH were more often taking statins (30% versus 15%, P =0.005), more often had atrial fibrillation (45% versus 30%, P =0.016), had more severe strokes (mean National Institute of Health Stroke Scale score 16.5 versus 14.7, P =0.022), and less often good collaterals (16% versus 24%, P =0.001). Patients with symptomatic ICH were more often taking statins (40% versus 15%, P =0.009) and had less often good collaterals (0% versus 24%, P 〈 0.001). Any ICH or symptomatic ICH were not associated with cholesterol levels. After multivariate analysis, the frequency of any ICH remained independently associated with previous statin use (OR, 3.1; 95% CI, 1.53 to 6.39; P =0.004), atrial fibrillation (OR, 2.5; CI, 1.35 to 4.75; P =0.004), National Institutes of Health Stroke Scale score (OR, 1.1; CI, 1.00 to 1.10; P =0.037), and worse collaterals (OR, 1.7; CI, 1.19 to 2.42; P =0.004). There was no association of outcome with prior statin use, total cholesterol level, or low-density lipoprotein cholesterol level. Conclusion— Prior statin use, but not cholesterol levels on admission, is associated with a higher frequency of any ICH after intra-arterial thrombolysis without impact on outcome.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2009
    detail.hit.zdb_id: 1467823-8
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  • 3
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 41, No. 4 ( 2010-04), p. 802-804
    Abstract: Background and Purpose— Spontaneous vertebral artery dissection (sVADs) mainly cause cerebral ischemia, with or without associated local symptoms and signs (headache, neck pain, or cervical radiculopathy), or with local symptoms and signs only. Methods— We compared the presenting characteristics of consecutive patients with single sVADs and ischemic events and those with local symptoms and signs only. Results— Of the 186 patients with first-ever unilateral sVAD, 165 (89%) presented with cerebral ischemia, and 21 (11%) presented with local symptoms and signs only. Patients with sVAD and ischemia were more often male (63% vs 29%; P =0.002), older (mean±SD age, 43.6±9.9 vs 38.6±9.0 years; P =0.027), and smokers (14% vs 3%; P =0.010), but less often, they had a history of migraine without aura (17% vs 38%; P =0.025) than did patients without ischemia. The multivariate analysis confirmed independent associations between male sex ( P =0.024), increasing age (0.027), and smoking ( P =0.012) and sVADs causing cerebral ischemia. Conclusions— These results suggest that men, older patients, and smokers with sVADs may be at increased risk for ischemic events.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2010
    detail.hit.zdb_id: 1467823-8
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  • 4
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 43, No. 4 ( 2012-04), p. 1052-1057
    Abstract: Endovascular therapy of acute ischemic stroke has been shown to be beneficial for selected patients. The purpose of this study is to determine predictors of outcome in a large cohort of patients treated with intra-arterial thrombolysis, mechanical revascularization techniques, or both. Methods— We prospectively acquired data for 623 patients with acute cerebral infarcts in the carotid artery territory who received endovascular treatment at a single center. Logistic regression analysis was performed to determine predictors of outcome. Results— Median National Institutes of Health Stroke Scale (NIHSS) at admission was 15. Partial or complete recanalization was achieved in 70.3% of patients; it was independently associated with hypercholesterolemia ( P =0.02), absence of coronary artery disease ( P =0.023), and more proximal occlusion site ( P 〈 0.0001). After 3 months, 80.5% of patients had survived, and 48.9% of patients reached favorable outcome (modified Rankin scale score 0–2). Good collaterals ( P 〈 0.0001), recanalization ( P =0.023), hypercholesterolemia ( P =0.03), lower NIHSS at admission ( P =0.001), and younger age ( P 〈 0.0001) were independent predictors for survival. More peripheral occlusion site ( P 〈 0.0001), recanalization ( P 〈 0.0001), hypercholesterolemia ( P =0.002), good collaterals ( P =0.002), lower NIHSS ( P 〈 0.0001), younger age ( P 〈 0.0001), absence of diabetes ( P =0.002), and no previous antithrombotic therapy ( P =0.036) predicted favorable outcome. Time to treatment was only a predictor of outcome, when collaterals were excluded from the model. Symptomatic intracerebral hemorrhage occurred in 5.5% and was independently predicted by poor collaterals ( P =0.004). Conclusions— Several independent predictors for outcome and complications were identified. Unlike in intravenous thrombolysis trials, time to treatment was a predictor of outcome only when collaterals were excluded from the model, indicating the important role of collaterals for the time window.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2012
    detail.hit.zdb_id: 1467823-8
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  • 5
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 42, No. 10 ( 2011-10), p. 2891-2895
    Abstract: Studies with very long follow-up are scarce in patients with cryptogenic stroke and patent foramen ovale (PFO). Little is known about the etiology of recurrent cerebrovascular events (CVE) in PFO patients. Methods— We collected information on recurrent CVE in 308 patients with cryptogenic stroke and PFO and sought to determine concurrent stroke causes that had emerged or been newly detected since the index event. One hundred fifty-eight patients received aspirin (48%), clopidogrel (2%), or oral anticoagulants (50%; medical group). One hundred fifty patients underwent percutaneous PFO closure (closure group). Results— Mean age at index event was 50 years (SD 13). In 33% of patients, the index stroke or transient ischemic attack was preceded by at least 1 CVE. Mean follow-up was 8.7±4.0 years. During follow-up, 32 recurrent CVE (13 strokes and 19 transient ischemic attacks) occurred in the medical and 16 recurrent CVE (8 strokes and 8 transient ischemic attacks) in the closure group. Concurrent etiologies were identified for 12 recurrent CVE in the medical group (38%): large artery disease (9%), small artery disease (6%), cardioembolism (13%), cerebral vasculitis (3%), and antiphospholipid-antibody-syndrome (6%). In the closure group, 7 recurrent CVE had a concurrent etiology (44%): large artery disease (6%), small artery disease (19%), cardioembolism (13%), and thrombophilic disorder (6%). The frequency of concurrent etiologies did not differ between patients with recurrent CVE under medical treatment and those undergoing PFO closure ( P =0.68). Conclusions— Concurrent etiologies are identified for more than one third of recurrent ischemic events in patients with cryptogenic stroke, casting doubt on the sole causal role of PFO.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2011
    detail.hit.zdb_id: 1467823-8
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  • 6
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 42, No. 11 ( 2011-11), p. 3061-3066
    Abstract: Use of intravenous tissue-type plasminogen activator (IV tPA) for acute ischemic stroke is restricted to patients with an international normalized ratio (INR) less than 1.7. However, a recent study showed increased risk of symptomatic intracranial hemorrhage after IV tPA use in patients with oral anticoagulants (OAC) even with an INR less than 1.7. The present study assessed the risk of symptomatic intracranial hemorrhage, clinical outcome, and mortality after intra-arterial therapy (IAT) in patients with and without previous use of OAC. Methods— Consecutive patients treated with IAT from December 1992 to October 2010 were included. Clinical outcome and mortality were assessed 90 days after stroke onset. Patients with and without previous use of OAC were compared. Results— Overall, 714 patients were treated with IAT. Twenty-eight patients (3.9%) were under OAC at time of symptom onset. Median INR in the OAC group was 1.79 (interquartile range [IQR], 1.41–2.3) and 1.01 (IQR, 1.0–1.09; P 〈 0.0001) in the group without OAC. Patients treated with OAC at admission underwent more often mechanical-only IAT than did patients without OAC (46.4% versus 12.8%; P 〈 0.0001). Comparing patients with and without previous use of OAC, we did not find any statistical difference in the rate of symptomatic intracranial hemorrhage (7.1% versus 6.0%; P =0.80), unfavorable outcome (modified Rankin Scale score, 3–6; 67.9% versus 50.9%; P =0.11), and mortality (17.9% versus 21.6%; P =0.58). Conclusions— Previous use of OAC did not significantly increase the risk of symptomatic intracranial hemorrhage after IAT or the risk of unfavorable outcome and mortality 90 days after IAT.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2011
    detail.hit.zdb_id: 1467823-8
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  • 7
    In: International Journal of Stroke, SAGE Publications, Vol. 9, No. 8 ( 2014-12), p. 985-991
    Abstract: Stroke patients with diabetes and admission hyperglycaemia have worse outcomes than non-diabetics, with or without intravenous thrombolysis. Poor vessel recanalization was reported in diabetics treated with intravenous thrombolysis. Aims This study aimed to determine the impact of admission glucose and diabetes on recanalization and outcome after intra-arterial thrombolysis. Methods We analysed 389 patients (213 men, 176 women) treated with intra-arterial thrombolysis. The association of diabetes and admission glucose value with recanalization, outcome, mortality, and symptomatic intracranial haemorrhage was determined. Recanalization was classified according to thrombolysis in myocardial infarction grades. Outcome was measured using the modified Rankin Scale at three-months and categorized as favourable (modified Rankin Scale 0–2) or poor (modified Rankin Scale 3–6). Results The rate of partial or complete recanalization (thrombolysis in myocardial infarction 2–3) did not differ between patients with and without diabetes (67% vs. 66%; P = 1·000). Mean admission glucose values were similar in patients with poor recanalization (thrombolysis in myocardial infarction 0–1) and patients with partial or complete recanalization (thrombolysis in myocardial infarction 2–3; 7·3 vs. 7·3 mmol/l; P = 0·746). Follow-up at three-months was obtained in 388 of 389 patients. Clinical outcome was favourable (modified Rankin Scale 0–2) in 189 patients (49%) and poor (modified Rankin Scale 3–6) in 199 patients (51%). Mortality at three-months was 20%. Diabetics were more likely to have poor outcome (72% vs. 48%; P = 0·001) and to be dead (30% vs. 19%; P = 0·044) at three-months. After multivariable analysis, there remained an independent relationship between diabetes and outcome ( P = 0·003; odds ratio 3·033, 95% confidence interval 1·452–6·336), but not with mortality ( P = 0·310; odds ratio 1·436; 95% confidence interval 0·714–2·888). Moreover, higher age ( P = 0·001; odds ratio 1·039; 95% confidence interval 1·017–1·061), higher baseline National Institutes of Health Stroke Scale score ( P 〈 0·0001; odds ratio 1·130; 95% confidence interval 1·079–1·182), location of vessel occlusion as categorical variable ( P 〈 0·0001), poor collaterals ( P = 0·02; odds ratio 1·587; 95% confidence interval 1·076–2·341), poor vessel recanalization ( P 〈 0·0001; odds ratio 4·713; 95% confidence interval 2·627–8·454), and higher leucocyte count ( P = 0·032; odds ratio 1·094; 95% confidence interval 1·008–1·188) were independent baseline predictors of poor outcome. Higher admission glucose was associated with poor outcome ( P = 0·006) and mortality ( P 〈 0·0001). After multivariate analyses, glucose remained independently associated with poor outcome ( P = 0·019; odds ratio 1·150; 95% confidence interval 1·023-1-292) and mortality ( P = 0·005; odds ratio 1·183; 95% confidence interval 1052–1·331). The rate of symptomatic intracranial haemorrhage was similar in diabetics and non-diabetics (6·7% vs. 4·6%; P = 0·512). Mean admission glucose was higher in patients with symptomatic intracranial haemorrhage than without (8·58 vs. 7·26 mmol/l; P = 0·010). Multivariable analysis confirmed an independent association between admission glucose and symptomatic intracranial haemorrhage ( P = 0·027; odds ratio 1·187; 95% confidence interval 1·020–1·381). Conclusions Diabetes and glucose value on admission did not influence recanalization after intra-arterial thrombolysis; nevertheless, they were independent predictors of poor outcome after intra-arterial thrombolysis and a higher admission glucose value was an independent predictor of symptomatic intracranial haemorrhage. This indicates that factors on the capillary, cellular, or metabolic level may account for the worse outcome in patients with elevated glucose value and diabetes.
    Type of Medium: Online Resource
    ISSN: 1747-4930 , 1747-4949
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2014
    detail.hit.zdb_id: 2211666-7
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  • 8
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 33, No. 2 ( 2012), p. 116-122
    Abstract: 〈 i 〉 Background: 〈 /i 〉 It is unclear whether octogenarians benefit from intra-arterial thrombolysis (IAT) for the treatment of acute ischemic stroke (AIS). The aim of the present study was to compare baseline characteristics, clinical outcome and complications of patients aged ≧80 with those of patients aged 〈 80 years. 〈 i 〉 Methods: 〈 /i 〉 Forty-three octogenarians and 524 younger patients with AIS were treated with IAT. The modified Rankin scale (mRS) score was used to assess 3-month outcome. 〈 i 〉 Results: 〈 /i 〉 There was a female preponderance among octogenarians (63 vs. 37%, p = 0.015). Stroke severity, occlusion site, and time from stroke onset to IAT did not differ between the groups. Good recanalization (TIMI 2–3) was achieved in 65% of older and in 71% of younger patients (p = 0.449). Rates of symptomatic intracranial hemorrhage (ICH) were 6% in patients 〈 80 years and 2% in octogenarians (p = 0.292). Favorable outcome (mRS 0–2) was less frequent among octogenarians (28 vs. 46%, p = 0.019), while mortality was higher (40 vs. 22%, p = 0.008). Octogenarians died more often from extracerebral complications than younger patients (59 vs. 27%, p = 0.008). 〈 i 〉 Conclusions: 〈 /i 〉 Compared with younger patients, octogenarians did not have a significantly increased risk of symptomatic ICH after IAT. Although favorable outcome was less frequent and mortality rates were higher, IAT appeared to be safe in octogenarians. It seems reasonable to include octogenarians in randomized clinical trials to assess the balance of risk and benefit of IAT in this patient group.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2012
    detail.hit.zdb_id: 1482069-9
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  • 9
    In: Journal of Neurology, Springer Science and Business Media LLC, Vol. 262, No. 9 ( 2015-9), p. 2025-2032
    Type of Medium: Online Resource
    ISSN: 0340-5354 , 1432-1459
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
    detail.hit.zdb_id: 1421299-7
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  • 10
    In: Journal of Neurology, Springer Science and Business Media LLC, Vol. 263, No. 1 ( 2016-1), p. 199-200
    Type of Medium: Online Resource
    ISSN: 0340-5354 , 1432-1459
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2016
    detail.hit.zdb_id: 1421299-7
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