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  • 1
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    Endovascular thrombectomy for acute ischaemic stroke with established large infarct: multicentre, open-label, randomised trial
    Elsevier BV ; 2023
    In:  The Lancet Vol. 402, No. 10414 ( 2023-11), p. 1753-1763
    Details
    In: The Lancet, Elsevier BV, Vol. 402, No. 10414 ( 2023-11), p. 1753-1763
    Type of Medium: Online Resource
    ISSN: 0140-6736
    URL: Article
    DOI: 10.1016/S0140-6736(23)02032-9
    RVK:
    XA 10000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2067452-1
    detail.hit.zdb_id: 3306-6
    detail.hit.zdb_id: 1476593-7
    SSG: 5,21
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  • 2
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    Mechanical thrombectomy in ischemic stroke after cardiovascular procedures: a propensity-matched cohort analysis
    BMJ ; 2023
    In:  Journal of NeuroInterventional Surgery Vol. 15, No. e1 ( 2023-09), p. e129-e135
    Details
    In: Journal of NeuroInterventional Surgery, BMJ, Vol. 15, No. e1 ( 2023-09), p. e129-e135
    Abstract: Stroke after a cardiovascular procedure (CVP) is a devastating complication adversely affecting outcome. Mechanical thrombectomy (MT) has not been investigated systematically in this population. Objective To carry out a retrospective study in patients undergoing MT for early stroke after CVP, aiming to further characterize this cohort of patients, and to evaluate the efficacy, safety, procedural characteristics, and outcome of MT. Methods A single-center stroke registry of patients who received MT was analyzed. Baseline and procedural parameters, mortality, functional outcome, recanalization rates, and complications were evaluated. Propensity score matching was carried out, identifying a control cohort with non-periprocedural large vessel occlusion (LVO). Results Overall 913 patients were included (mean age 73.0 (±13.0) years, 52.5% female, median National Institutes of Health Stroke Scale score 15 (10–19)). Eleven patients with a LVO after a recent ( 〈 30 days postoperatively) CVP were identified (n=3 transcatheter aortic valve and n=1 surgical aortic valve replacements (SAVR), n=3 coronary bypass grafting (CABG) surgeries, n=2 SAVR+CABG, and n=2 aortic surgeries). After matching, 8 patients in the CVP group were compared with 16 patients in the matched cohort. Comparable rates of reperfusion were achieved. Time from symptom onset to groin puncture (171.5 min (136.3, 178.3) vs 284.0 min (215.0, 490.5); p=0.039), as well as recanalization (195.0 min (146.0, 201.0) vs 419.0 min (274.0, 613.0); p=0.028) was faster in the CVP group. However, this was not reflected by an improved outcome (modified Rankin Scale score after 90 days: 5.5 (3.3, 6.0) vs 5.0 (4.0, 6.0), mortality after 90 days 50.0% vs 37.5%). Complications did not differ between the groups. Conclusions Use of MT for LVO stroke in patients after a recent CVP is a safe and efficient treatment in comparison with patients with a non-periprocedural LVO undergoing MT.
    Type of Medium: Online Resource
    ISSN: 1759-8478 , 1759-8486
    URL: Article
    DOI: 10.1136/jnis-2022-019152
    Language: English
    Publisher: BMJ
    Publication Date: 2023
    detail.hit.zdb_id: 2506028-4
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  • 3
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    Quantitative Lesion Water Uptake in Acute Stroke Computed Tomography Is a Predictor of Malignant Infarction
    Ovid Technologies (Wolters Kluwer Health) ; 2018
    In:  Stroke Vol. 49, No. 8 ( 2018-08), p. 1906-1912
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 49, No. 8 ( 2018-08), p. 1906-1912
    Abstract: Early selection of patients with acute middle cerebral artery infarction at risk for malignant edema is critical to initiate timely decompressive surgery. Net water uptake (NWU) per brain volume is a quantitative imaging biomarker of space-occupying ischemic edema which can be measured in computed tomography. We hypothesize that NWU in early infarct lesions can predict development of malignant edema. The aim was to compare NWU in acute brain infarct against other common predictors of malignant edema. Methods— After consecutive screening of single-center registry data, 153 patients with acute proximal middle cerebral artery occlusion fulfilled the inclusion criteria. A total of 29 (18.2%) patients developed malignant edema defined as end point in follow-up imaging leading to decompressive surgery and death as a direct implication of mass effect. Early infarct lesion volume and NWU were quantified in multimodal admission computed tomography; time from symptom onset to admission imaging was recorded. Results— Mean time from onset to admission imaging was equivalent between patients with and without malignant infarcts (mean±SD: 3.3±1.4 hours and 3.3±1.7 hours, respectively). Edematous tissue expansion by NWU within infarct lesions occurred across all patients in this cohort (NWU: 9.1%±6.8%; median, 7.9%; interquartile range, 8.8%; range, 0.1%–35.6%); 7.0% (±5.2) in nonmalignant and 18.0% (±5.7) in malignant infarcts. Based on univariate receiver operating characteristic curve analysis, NWU 〉 12.7% or an edema rate 〉 3.7% NWU/h identified malignant infarcts with high discriminative power (area under curve, 0.93±0.02). In multivariate binary logistic regression, the probability of malignant infarct was significantly associated with early infarct volume and NWU. Conclusions— Computed tomography–based quantitative NWU in early infarct lesions is an important surrogate marker for developing malignant edema. Besides volume of early infarct, the measurements of lesion water uptake may further support identifying patients at risk for malignant infarction.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.118.020507
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2018
    detail.hit.zdb_id: 1467823-8
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  • 4
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    Functional Outcome Following Stroke Thrombectomy in Clinical Practice
    Ovid Technologies (Wolters Kluwer Health) ; 2019
    In:  Stroke Vol. 50, No. 9 ( 2019-09), p. 2500-2506
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 50, No. 9 ( 2019-09), p. 2500-2506
    Abstract: Endovascular treatment for large vessel occlusion in ischemic stroke has proven to be effective in large clinical trials. We aimed to provide real-world estimates of endovascular treatment reperfusion rates and functional outcome on a countrywide scale. Methods— Two thousand seven hundred ninety-four patients with large vessel occlusion were included into an investigator-initiated, industry-independent, prospective registry in 25 sites in Germany between June 2015 and April 2018. The primary outcome was the score on the modified Rankin Scale ranging from zero (no symptoms) to 6 (death) at 3 months. Secondary analyses included the prediction of a good outcome (modified Rankin Scale, 0–2). Dichotomized analyses of predictors were performed using logistic regression adjusted for potential confounders. Results— Median age was 75 years (interquartile range, 64–82); median National Institutes of Health Stroke Scale score was 15 (interquartile range, 10–19). Vessel occlusion was in the anterior circulation in 2265 patients (88%) and in the posterior circulation in 303 patients (12%). Intravenous alteplase before endovascular treatment was given in 1457 patients (56%). Successful reperfusion was achieved in 2143 subjects (83%). At 3 months, 854 patients (37%) showed a good outcome; mortality was 29%. There was no difference between anterior and posterior circulation occlusions ( P =0.27). Significant predictors for a good outcome were younger age (odds ratio [OR], 1.06; 95% CI, 1.05–1.07), no interhospital transfer (OR, 1.39; 95% CI, 1.03–1.88), lower stroke severity (OR, 1.10; 95% CI, 1.08–1.13), smaller infarct size (OR, 1.26; 95% CI, 1.15–1.39), alteplase use (OR, 1.49; 95% CI, 1.08–2.06), and reperfusion success (OR, 1.69; 95% CI, 1.45–1.96). Conclusions— High rates of favorable outcome can be achieved on a countrywide scale by endovascular treatment. Mortality appears to be greater in the daily routine than otherwise reported by authors of large randomized trials. There were no outcome differences between the anterior and posterior circulation. Clinical Trial Registration— URL: https://www.clinicaltrials.gov . Unique identifier: NCT03356392.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.119.026005
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2019
    detail.hit.zdb_id: 1467823-8
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  • 5
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    Favorable Venous Outflow Profiles Correlate With Favorable Tissue-Level Collaterals and Clinical Outcome
    Ovid Technologies (Wolters Kluwer Health) ; 2021
    In:  Stroke Vol. 52, No. 5 ( 2021-05), p. 1761-1767
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 52, No. 5 ( 2021-05), p. 1761-1767
    Abstract: Patients with acute ischemic stroke due to large vessel occlusion and favorable tissue-level collaterals (TLCs) likely have robust cortical venous outflow (VO). We hypothesized that favorable VO predicts robust TLC and good clinical outcomes. Methods: Multicenter retrospective cohort study of consecutive acute ischemic stroke due to large vessel occlusion patients who underwent thrombectomy triage. Included patients had interpretable prethrombectomy computed tomography, computed tomography angiography, and cerebral perfusion imaging. TLCs were measured on cerebral perfusion studies using the hypoperfusion intensity ratio (volume ratio of brain tissue with [Tmax 〉 10 s/Tmax 〉 6 s]). VO was determined by opacification of the vein of Labbé, sphenoparietal sinus, and superficial middle cerebral vein on computed tomography angiography as 0, not visible; 1, moderate opacification; and 2, full. Clinical and demographic data were determined from the electronic medical record. Using multivariable regression analyses, we determined the association between VO and (1) favorable TLC status (defined as hypoperfusion intensity ratio ≤0.4) and (2) good functional outcome (modified Rankin Scale score, 0–2). Results: Six hundred forty-nine patients met inclusion criteria. Patients with favorable VO were younger (median age, 72 [interquartile range (IQR), 62–80] versus 77 [IQR, 66–84] years), had a lower baseline National Institutes of Health Stroke Scale (median, 12 [IQR, 7–17] versus 19 [IQR, 13–20] ), and had a higher Alberta Stroke Program Early Computed Tomography Score (median, 9 [IQR, 7–10] versus 7 [IQR, 6–9] ). Favorable VO strongly predicted favorable TLC (odds ratio, 4.5 [95% CI, 3.1–6.5]; P 〈 0.001) in an adjusted regression analysis. Favorable VO also predicted good clinical outcome (odds ratio, 10 [95% CI, 6.2–16.0]; P 〈 0.001), while controlling for favorable TLC, age, glucose, baseline National Institutes of Health Stroke Scale, and good vessel reperfusion status. Conclusions: In this selective retrospective cohort study of acute ischemic stroke due to large vessel occlusion patients undergoing thrombectomy triage, favorable VO profiles correlated with favorable TLC and were associated with good functional outcomes after treatment. Future prospective studies should independently validate our findings.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.120.032242
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2021
    detail.hit.zdb_id: 1467823-8
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  • 6
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    Number of Retrieval Attempts Rather Than Procedure Time Is Associated With Risk of Symptomatic Intracranial Hemorrhage
    Ovid Technologies (Wolters Kluwer Health) ; 2021
    In:  Stroke Vol. 52, No. 5 ( 2021-05), p. 1580-1588
    Details
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 52, No. 5 ( 2021-05), p. 1580-1588
    Abstract: Endovascular therapy is the standard of care in the treatment of acute ischemic stroke due to large-vessel occlusion. A direct association between the number of device passes and the occurrence of symptomatic intracranial hemorrhage (SICH) has been suggested. This study represents an in-depth investigation of the hypothesis that 〉 3 retrieval attempts is associated with an increased rate of SICH in a large multicenter patient cohort. Methods: Two thousand six hundred eleven patients from the prospective German Stroke Registry were analyzed. Patients who received Endovascular therapy for acute large-vessel occlusion of the anterior circulation with known admission National Institutes of Health Stroke Scale and Alberta Stroke Program Early CT Score, final Thrombolysis in Cerebral Infarction, and number of retrieval passes were included. The primary outcome was defined as SICH. The secondary outcome was any type of radiologically confirmed intracranial hemorrhage within the first 24 hours. Multivariate mixed-effects models were used to adjust for cluster effects of the participating centers, as well as for confounders. Results: Five hundred ninety-three patients fulfilled the inclusion criteria. The median number of retrieval passes was 2 [interquartile range, 1–3]. SICH occurred in 26 cases (4.4%), whereas intracranial hemorrhage was identified by neuroimaging in 85 (14.3%) cases. More than 3 retrieval passes was the strongest predictor for SICH (odds ratio, 3.61 [95% CI, 1.38–9.42] , P =0.0089) following adjustment for age, admission National Institutes of Health Stroke Scale, admission Alberta Stroke Program Early CT Score, and Thrombolysis in Cerebral Infarction, as well as time from symptom onset to flow restoration. Baseline Alberta Stroke Program Early CT Score of 8 to 9 (odds ratio, 0.26 [95% CI, 0.07–0.89], P =0.032) or 10 (odds ratio, 0.21 [95% CI, 0.06–0.78], P =0.020) were significant protective factors against the occurrence of SICH. Conclusions: More than 3 retrieval attempts is associated with a significant increase in SICH risk, regardless of patient age, baseline National Institutes of Health Stroke Scale, or procedure time. This should be considered when deciding whether to continue a procedure, especially in patients with large baseline infarctions. Registration: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT03356392.
    Type of Medium: Online Resource
    ISSN: 0039-2499 , 1524-4628
    URL: Article
    DOI: 10.1161/STROKEAHA.120.031242
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2021
    detail.hit.zdb_id: 1467823-8
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  • 7
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    Early clinical surrogates for outcome prediction after stroke thrombectomy in daily clinical practice
    BMJ ; 2020
    In:  Journal of Neurology, Neurosurgery & Psychiatry Vol. 91, No. 10 ( 2020-10), p. 1055-1059
    Details
    In: Journal of Neurology, Neurosurgery & Psychiatry, BMJ, Vol. 91, No. 10 ( 2020-10), p. 1055-1059
    Abstract: To investigate early clinical surrogates for long-term independency of patients treated with thrombectomy for large vessel occlusion stroke in daily clinical routine. Methods All patients with anterior circulation stroke enrolled in the German Stroke Registry-Endovascular Treatment from 07/2015 to 04/2018 were analysed. National Institute of Health Stroke Scale (NIHSS) on admission, NIHSS percentage change, NIHSS delta and NIHSS at 24 hours as well as existing binary definitions of early neurological improvement (ENI; improvement of 8 (major ENI)/10 (dramatic ENI) NIHSS points or reaching 0/1 were compared for predicting functional outcome at 90 days using the modified Rankin Scale (mRS). Excellent and favourable outcome were defined as 0–1 and 0–2, respectively. Results Among 2262 endovasculary treated patients with acute ischaemic anterior circulation stroke, NIHSS at 24 hours had the highest discriminative ability to predict excellent (receiver operator characteristics (ROC) NIHSS 24 hours area under the curve (AUC) 0.86 (0.84–0.88)) and favourable long-term functional outcome (ROC NIHSS 24 hours AUC 0.86 (0.85–0.88)) in comparison to NIHSS percentage change (ROC % change AUC mRS ≤1: 0.81 (0.78–0.83) mRS ≤2: 0.81 (0.79–0.83)), NIHSS delta change (ROC Δ change AUC mRS ≤1: 0.74 (0.72–0.77), mRS ≤2: 0.77 (0.74–0.79)) and NIHSS admission (ROC Adm AUC mRS ≤1: 0.70 (0.68–0.73), mRS ≤2: 0.67 (0.68–0.71)). Advanced age was the only independent predictor (adjusted OR 1.05, 95% CI 1.03 to 1.07, p 〈 0.001) for turning the outcome prognosis from favourable (mRS ≤2) to poor (mRS ≥4) at 90 days. Conclusion The NIHSS at 24 hours postintervention with a threshold of ≤8 points serves best as a surrogate for long-term functional outcome after thrombectomy for anterior circulation stroke in daily clinical practice. Only advanced age significantly decreases its predictive value.
    Type of Medium: Online Resource
    ISSN: 0022-3050 , 1468-330X
    URL: Article
    DOI: 10.1136/jnnp-2020-323742
    RVK:
    XA 10000
    Language: English
    Publisher: BMJ
    Publication Date: 2020
    detail.hit.zdb_id: 1480429-3
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  • 8
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    Novel synthetic clot analogs for in-vitro stroke modelling
    Public Library of Science (PLoS) ; 2022
    In:  PLOS ONE Vol. 17, No. 9 ( 2022-9-9), p. e0274211-
    Details
    In: PLOS ONE, Public Library of Science (PLoS), Vol. 17, No. 9 ( 2022-9-9), p. e0274211-
    Abstract: The increased demand for training of mechanical thrombectomy in ischemic stroke and development of new recanalization devices urges the creation of new simulation models both for training and device assessment. Clots properties have shown to play a role in procedural planning and thrombectomy device effectiveness. In this study, we analyzed the characteristics and applicability of completely synthetic, animal-free clots in the setting of an in-vitro model of mechanical thrombectomy for training and device assessment. Methods Synthetic clots based on agarose (n = 12) and silicone (n = 11) were evaluated in an in-vitro neurointervention simulation of mechanical thrombectomy with clot extraction devices. Calcified clots of mixed nature were simulated with addition of 3D printed structures. 9 clots were excluded due to insufficient vessel occlusion and failure to integrate with clot extraction device. Synthetic thrombi were characterized and compared using a categorical score-system on vessel occlusion, elasticity, fragmentation, adherence and device integration. Results Both agarose-based and silicone-based clots demonstrated relevant flow arrest and a good integration with the clot extraction device. Silicone-based clots scored higher on adherence to the vessel wall and elasticity. Conclusion Selected synthetic clots can successfully be implemented in an in-vitro training environment of mechanical thrombectomy. The clots’ different properties might serve to mimic fibrin-rich and red blood cell-rich human thrombi.
    Type of Medium: Online Resource
    ISSN: 1932-6203
    URL: Article
    URL: Article
    URL: Article
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    URL: Article
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    URL: Article
    DOI: 10.1371/journal.pone.0274211
    DOI: 10.1371/journal.pone.0274211.g001
    DOI: 10.1371/journal.pone.0274211.g002
    DOI: 10.1371/journal.pone.0274211.t001
    DOI: 10.1371/journal.pone.0274211.t002
    DOI: 10.1371/journal.pone.0274211.s001
    DOI: 10.1371/journal.pone.0274211.s002
    DOI: 10.1371/journal.pone.0274211.s003
    Language: English
    Publisher: Public Library of Science (PLoS)
    Publication Date: 2022
    detail.hit.zdb_id: 2267670-3
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  • 9
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    The Cerebral Collateral Cascade : Comprehensive Blood Flow in Ischemic Stroke
    Ovid Technologies (Wolters Kluwer Health) ; 2022
    In:  Neurology Vol. 98, No. 23 ( 2022-06-7), p. e2296-e2306
    Details
    In: Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 98, No. 23 ( 2022-06-7), p. e2296-e2306
    Abstract: Robust cerebral collaterals are associated with favorable outcomes in patients with acute ischemic stroke due to large vessel occlusion treated by thrombectomy. However, collateral status assessment mostly relies on single imaging biomarkers and a more comprehensive holistic approach may provide deeper insights into the biology of collateral perfusion on medical imaging. Comprehensive collateralization is defined as blood flow of cerebral arteries through the brain tissue and into draining veins. We hypothesized that a comprehensive analysis of the cerebral collateral cascade (CCC) on an arterial, tissue, and venous level would predict clinical and radiologic outcomes. Methods This was a multicenter retrospective cohort study of patients with acute stroke undergoing thrombectomy triage. CCC was determined by quantifying pial arterial collaterals, tissue-level collaterals, and venous outflow (VO). Pial arterial collaterals were determined by CT angiography; tissue-level collaterals were assessed on CT perfusion. VO was assessed on CT angiography using the cortical vein opacification score. Three groups were defined: CCC+ (good pial collaterals, tissue-level collaterals, and VO), CCC− (poor pial collaterals, tissue-level collaterals, and VO), and CCC mixed (the remainder of the patients). Primary outcome was functional independence (modified Rankin Scale score 0–2) at 90 days. Secondary outcome was final infarct volume. Results A total of 647 patients met inclusion criteria: 176 CCC+, 345 CCC mixed , and 126 CCC−. Multivariable ordinal logistic regression showed that CCC+ predicted good functional outcomes (odds ratio [OR] 18.9 [95% CI 8–44.5] ; p 〈 0.001) compared with CCC− and CCC mixed . CCC mixed patients likely had better functional outcomes compared with CCC− patients (OR 2.5 [95% CI 1.2–5.4]; p = 0.014). Quantile regression analysis (50th percentile) showed that CCC+ (β −78.5, 95% CI −96.0 to −61.1; p 〈 0.001) and CCC mixed (β −64.0, 95% CI −82.4 to −45.6; p 〈 0.001) profiles were associated with considerably lower final infarct volumes compared with CCC− profiles. Discussion Comprehensive assessment of the collateral blood flow cascade in patients with acute stroke is a strong predictor of clinical and radiologic outcomes in patients treated by thrombectomy.
    Type of Medium: Online Resource
    ISSN: 0028-3878 , 1526-632X
    URL: Article
    DOI: 10.1212/WNL.0000000000200340
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2022
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  • 10
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    Patient-reported, health-related, quality of life after stroke thrombectomy in clinical practice
    Ovid Technologies (Wolters Kluwer Health) ; 2020
    In:  Neurology Vol. 95, No. 12 ( 2020-09-22), p. e1724-e1732
    Details
    In: Neurology, Ovid Technologies (Wolters Kluwer Health), Vol. 95, No. 12 ( 2020-09-22), p. e1724-e1732
    Abstract: To determine patient-reported health-related quality of life (HRQOL) after stroke thrombectomy in clinical practice and to identify predictors of better HRQOL by analyzing data of 504 consecutive patients treated in a large university stroke center. Methods All patients with stroke treated by thrombectomy (June 2015–October 2018) were prospectively enrolled in this observational study. At 90 days, functional outcome was assessed by the modified Rankin Scale (mRS) and patient-reported HRQOL was assessed by the EuroQol Group 5-Dimension (EQ-5D) self-report questionnaire, consisting of 5 health domains. The EQ-5D utility index (EQ-5D-I) score (−0.594 to 1.00, with higher values indicating better HRQOL) was calculated. Linear regression analysis was applied to identify predictors of better HRQOL (higher EQ-5D-I score). Results Of 504 patients (median age 76 years, 51.8% female), the mean EQ-5D-I score was 0.39 (SD 0.44). The proportion of stroke survivors who reported complaints in the different domains decreased from 66% in Usual Activities to 57% in Mobility, 50.4% in Self-Care, 41.7% in Pain/Discomfort, and 40.8% Anxiety/Depression. Lower age, lower prestroke mRS score, lower baseline NIH Stroke Scale score, higher Alberta Stroke Program Early CT Score, concomitant thrombolysis therapy, and a successful recanalization were independent predictors of better HRQOL. Conclusions Patient-reported HRQOL provides a more comprehensive assessment of stroke outcome than the mRS score. Health domains involving motor function most frequently showed complaints in HRQOL after stroke thrombectomy, while a large proportion of patients did not report any complaints across the different health domains. Predictors of better HRQOL closely match the predictors of better functional outcome measured by the mRS in other thrombectomy studies.
    Type of Medium: Online Resource
    ISSN: 0028-3878 , 1526-632X
    URL: Article
    DOI: 10.1212/WNL.0000000000010356
    RVK:
    XA 10000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2020
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