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  • 1
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 44, No. 3-4 ( 2017), p. 203-209
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Thrombus visualization in patients with acute ischemic stroke has been detected and reported using various imaging modalities. T1-weighted imaging (T1-WI) can depict thrombi as hyperintense signals within vessels. Moreover, in addition to thrombi, T1-WI hyperintensities in arteries may suggest arterial dissection. However, the frequency of and factors related to the T1-hyperintense vessel sign (T1-HVS) are not fully known. The aim of this study was to clarify the prevalence of and related factors for the T1-HVS in patients with acute ischemic stroke. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 From September 2014 through December 2015, consecutive acute ischemic stroke patients who were admitted to our stroke unit within 7 days from symptom onset were retrospectively recruited from the prospective registry. A T1-HVS was defined as the presence of a hyperintense signal, with intensity higher than surrounding brain, within the vessel lumen. Moreover, T1-HVSs were separated into filled T1-HVSs (hyperintensity fills whole vessel lumen) and non-filled T1-HVSs. The frequency of the T1-HVS and the timing of emersion and the relationship between the presence of the T1-HVS and arterial occlusion were assessed. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 A total of 399 patients (139 women; median age 73 years; National Institutes of Health Stroke Scale score 3) were enrolled in the present study. Of these, 327 (82%) patients had T1-WI on admission. Two hundred and sixty-seven (67%) subjects had at least one follow-up T1-WI (median 6 days after admission), and 134 (34%) cases had ≥2 follow-up T1-WI examinations. The T1-HVS was observed in 18 patients during admission; therefore, the frequency of the T1-HVS in acute ischemic stroke patients was 4.5% (95% CI 2.5-6.5%). All but one (94%) of the T1-HVSs were first observed on follow-up imaging, and the median number of days from onset to T1-HVS appearance was 9. For patients having initial major artery occlusion and follow-up MRI ( 〈 i 〉 n 〈 /i 〉 = 95), sensitivity and specificity of the T1-HVS for persistent arterial occlusion on follow-up MR angiography were 22 and 100%, respectively. T1-HVS persisted for a few months and then normalized. Although there were no significant differences between filled and non-filled T1-HVS, more patients with non-filled T1-HVS had arterial dissection (43%) than those with filled T1-HVS (9%, 〈 i 〉 p 〈 /i 〉 = 0.245). 〈 b 〉 〈 i 〉 Conclusion: 〈 /i 〉 〈 /b 〉 The T1-HVS was observed in 4.5% of acute ischemic stroke patients. T1-HVSs appeared in the subacute phase in arteries with persistent occlusion and remained for a few months.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2017
    detail.hit.zdb_id: 1482069-9
    detail.hit.zdb_id: 1069462-6
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  • 2
    In: Cerebrovascular Diseases Extra, S. Karger AG, Vol. 5, No. 2 ( 2015-7-9), p. 84-90
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Atrial fibrillation (AF) is an important risk factor for transient ischemic attack (TIA). However, little is known about the characteristics of TIA patients with AF. This study investigated the characteristics of such patients, using data from a retrospective, observational, multicenter study. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 TIA patients admitted to 13 stroke centers in Japan within 7 days of onset between January 2008 and December 2009 were included. The present analyses compared baseline characteristics, clinical symptoms, findings from diffusion-weighted imaging (DWI), and clinical outcomes between patients with and without AF (AF and non-AF groups). 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 A total of 464 patients (292 men; mean age 68.5 ± 13.2 years) were registered. Of these, 79 patients (17%) had AF. Patients in the AF group were older (73.9 ± 9.1 vs. 67.4 ± 13.6 years, p 〈 0.001) and more likely to show disturbance of consciousness (13 vs. 6%, p = 0.046) and aphasia (9 vs. 3%, p = 0.007) than patients in the non-AF group. Although no difference in the overall DWI-positive rate was seen between the groups (28 vs. 20%, p 〈 i 〉 = 〈 /i 〉 0.102), a single lesion (23 vs. 10%, p 〈 0.001), a lesion ≥15 mm (11 vs. 4%, p = 0.006), and a single lesion ≥15 mm (11 vs. 2%, p 〈 0.001) on DWI were more frequent in the AF group. Multivariate logistic regression analysis identified increased age [odds ratio (OR) 1.04; 95% confidence interval (CI) 1.02-1.07] and DWI single lesion ≥15 mm (OR 5.67; 95% CI 1.92-16.7) as independently associated with the presence of AF. 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 In this study, 17% of our TIA patients had AF. We found an association between the acute ischemic lesion pattern on DWI of a single lesion ≥15 mm and AF in TIA patients. These results might lead to a better diagnosis of TIA patients with AF.
    Type of Medium: Online Resource
    ISSN: 1664-5456
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2015
    detail.hit.zdb_id: 2651613-5
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  • 3
    In: European Neurology, S. Karger AG, Vol. 54, No. 3 ( 2005), p. 161-162
    Type of Medium: Online Resource
    ISSN: 0014-3022 , 1421-9913
    RVK:
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2005
    detail.hit.zdb_id: 209426-5
    detail.hit.zdb_id: 1482237-4
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  • 4
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 27, No. 3 ( 2009), p. 230-234
    Abstract: 〈 i 〉 Background: 〈 /i 〉 Contrast transesophageal echocardiography (c-TEE) and contrast transcranial Doppler (c-TCD) are useful diagnostic tools for detecting right-to-left shunts (RLS). However, the diagnostic accuracy of c-TCD for patent foramen ovale (PFO) remains uncertain. We investigated the relationship between the size of PFO determined by c-TEE and c-TCD findings and assessed the detectable rate of RLS by c-TCD. 〈 i 〉 Methods: 〈 /i 〉 We assessed RLS three times using simultaneous c-TCD and c-TEE in 107 patients (321 examinations). We classified all of ultrasound examinations into three groups by size according to microbubbles on c-TEE, such as no PFO (0 microbubble), small PFO (1–29 microbubbles) and large PFO (≥30 microbubbles). We also calculated the number of microembolic signals (MES) on c-TCD and evaluated the association between PFO size on c-TEE and MES count on c-TCD. 〈 i 〉 Results: 〈 /i 〉 In the present study, c-TEE detected RLS in 105 (33%; small PFO, n = 78; large PFO, n = 27), and c-TCD detected RLS in 49 (15%) of 321 examinations. Among 78 examinations with small PFO, MES were found in only 19 (24%) on c-TCD. In contrast, of all 27 examinations with large PFO, MES were found on c-TCD. Also, c-TCD were able to detect MES in 3 of 216 examinations among the no-PFO group. When ≥2 MES on c-TCD was established as the cutoff to predict large PFO on c-TEE, the sensitivity, specificity and accuracy were 96.3, 96.8, and 96.9%, respectively. 〈 i 〉 Conclusion: 〈 /i 〉 When two or more MES were determined by c-TCD, large PFO could be accurately diagnosed.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2009
    detail.hit.zdb_id: 1482069-9
    detail.hit.zdb_id: 1069462-6
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  • 5
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 50, No. 5 ( 2021), p. 526-534
    Abstract: 〈 b 〉 〈 i 〉 Introduction: 〈 /i 〉 〈 /b 〉 Intracerebral hemorrhage (ICH) is a devastating hemorrhagic event and is associated with high mortality or severe neurological sequelae. Age-associated differences in hematoma location for nonlobar ICH are not well known. The aims of the present study were to elucidate the relationship between age and hematoma location and to assess the differences in small-vessel disease (SVD) burden as a potential surrogate marker for longstanding hypertension among various hematoma locations. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 From September 2014 through July 2019, consecutive patients with acute, spontaneous ICH were retrospectively enrolled from a prospective registry. Magnetic resonance imaging was performed during admission, and the total SVD burden score (including microbleeds, lacunes, enlarged perivascular spaces, and white matter hyperintensities) was calculated. The relationships of hematoma location with aging and SVD burden were assessed by using multivariate logistic regression analyses. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 A total of 444 patients (156 women [35%]; median age 69 [interquartile range 59–79] years; National Institutes of Health Stroke Scale score 9 [17][3–17] ) were enrolled in the present study. Multivariate logistic regression analyses showed that advanced age was independently associated with thalamic (odds ratio [OR]: 1.48, 95% confidence interval [CI] : 1.19–1.84, 〈 i 〉 p 〈 /i 〉 & #x3c; 0.001 for 10-year increment) and lobar hemorrhage (OR: 1.58, 95% CI: 1.19–2.09, 〈 i 〉 p 〈 /i 〉 = 0.002) and was independently and negatively related to putaminal hemorrhage (OR: 0.55, 95% CI: 0.44–0.68, 〈 i 〉 p 〈 /i 〉 & #x3c; 0.001). The total SVD burden score was independently and positively associated with thalamic hemorrhage (OR: 1.27, 95% CI: 1.01–1.59, 〈 i 〉 p 〈 /i 〉 = 0.045) and negatively with lobar hemorrhage (OR: 0.74, 95% CI: 0.55–0.99, 〈 i 〉 p 〈 /i 〉 = 0.042), even after adjusting by age, but not with putaminal hemorrhage (OR: 0.91, 95% CI: 0.73–1.14, 〈 i 〉 p 〈 /i 〉 = 0.395). 〈 b 〉 〈 i 〉 Conclusion: 〈 /i 〉 〈 /b 〉 Putaminal, thalamic, and lobar hemorrhages are prone to occur in specific ages and SVD states: putaminal in young patients, thalamic in old and high SVD burden patients, and lobar hemorrhages in old and low SVD burden patients. Susceptibility to bleeding with aging or severe SVD accumulation seems to differ considerably among brain locations.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2021
    detail.hit.zdb_id: 1482069-9
    detail.hit.zdb_id: 1069462-6
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  • 6
    In: Cerebrovascular Diseases, S. Karger AG, Vol. 37, No. 5 ( 2014), p. 330-335
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 The purpose of this study was to elucidate the incidence and predictors of ischemic stroke or recurrent transient ischemic attack (TIA) during acute hospitalization in patients with TIA. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 We carried out a multicenter retrospective study to clarify the characteristics of in-patients with TIA. The subjects of this study were TIA patients admitted to 13 stroke hospitals within 7 days after onset between 2008 and 2009. TIA was defined as focal neurologic symptoms ascribable to a vascular etiology lasting less than 24 h. We investigated the incidence and predictors of ischemic events including ischemic stroke or recurrent TIA during hospitalization. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 A total of 464 patients with TIA (292 men, 69 ± 13 years) were registered. Of those, 400 (86.2%) were admitted within 24 h of TIA onset. The mean length of hospital stay was 13 days. During hospitalization, 8 patients had ischemic strokes and 26 had recurrent TIAs. The leading subtype of 8 ischemic strokes was small vessel disease (n = 3) followed by cardioembolism (n = 2). Multiple logistic regression analysis showed that hypertension (OR: 3.41; 95% CI: 1.23-12.3), MRI-diffusion-weighted image positivity (OR: 2.49; 95% CI: 1.15-5.25), and hemiparesis (OR: 2.30; 95% CI: 1.02-5.88) were independently associated with ischemic events during hospitalization. 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 In this study, 1.7% of patients with TIA had ischemic stroke during acute hospitalization, and the most common subtype was small vessel disease. Subsequent ischemic stroke and recurrent TIA were associated with hypertension, positive DWI findings, and hemiparesis.
    Type of Medium: Online Resource
    ISSN: 1015-9770 , 1421-9786
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2014
    detail.hit.zdb_id: 1482069-9
    detail.hit.zdb_id: 1069462-6
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  • 7
    In: Cerebrovascular Diseases Extra, S. Karger AG, Vol. 4, No. 2 ( 2014-8-1), p. 174-181
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Chronic kidney disease (CKD) is associated with cerebral small vessel diseases (SVD) and predicts stroke, cardiovascular events and mortality. However, its association with recent small subcortical infarcts (RSSI), a novel subtype of cerebral SVD, has not yet been established in stroke patients. The aim of this longitudinal study was to clarify whether CKD can predict clinical outcome in patients with RSSI. 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 We enrolled patients with first-ever RSSI (formerly categorized as acute lacunar stroke). CKD was defined as an estimated glomerular filtration rate of 〈 60 ml/min/1.73 m 〈 sup 〉 2 〈 /sup 〉 on admission. The patients were divided into two groups according to the presence or absence of CKD. The endpoints were recurrent stroke, cardiovascular events or all-cause mortality. The patients were followed up at 3, 6 and 12 months after stroke onset and yearly thereafter. Event-free survival analysis was undertaken using Kaplan-Meier plots and the log-rank test. Cox's proportional-hazards analysis was conducted regarding age, sex and the presence of any cerebral SVD. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 A total of 152 patients (66% males; mean age: 67.6 years) were consecutively enrolled, and 44 (29%) had CKD. During the follow-up period (median: 3 years; interquartile range: 1-4), 27 patients (18%) reached endpoints. The numbers of patients per endpoint were as follows: all-cause mortality 14, ischemic stroke 9, hemorrhagic stroke 2 and aortic dissection 2. Patients with CKD were significantly older (77 vs. 64 years; p 〈 0.001), had higher serum creatinine (0.96 vs. 0.65 mg/dl; p 〈 0.001), higher brain natriuretic peptide (51.1 vs. 18.5 pg/ml; p 〈 0.001) and a higher National Institutes of Health Stroke Scale score on admission (3 vs. 2; p 〈 0.001), and were less likely to have modified Rankin Scale scores of 0-2 after stroke onset (52 vs. 77%; p = 0.003). Patients with white matter hyperintensity [odds ratio (OR) 3.0; 95% confidence interval (CI): 1.5-6.2; p = 0.003] and those with microbleeds (OR 2.5; 95% CI: 1.2-5.1; p = 0.015) had more pronounced CKD than the remaining patients. A Kaplan-Meier curve analysis showed that patients with CKD had a less favorable outcome than those without CKD (p 〈 0.001). The multivariate Cox proportional-hazards analysis revealed that CKD was associated with recurrent stroke, cardiovascular events or all-cause mortality (hazard ratio 2.22; 95% CI: 1.12-4.25; p = 0.02). 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 CKD was found to be independently associated with recurrent stroke, cardiovascular events or all-cause mortality in patients with RSSI.
    Type of Medium: Online Resource
    ISSN: 1664-5456
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2014
    detail.hit.zdb_id: 2651613-5
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