80 research outputs found

    Development of workflow task analysis during cerebral diagnostic angiographies: Time-based comparison of junior and senior tasks

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    International audienceOBJECTIVE: Assessing neuroradiologists' skills in the operating room (OR) is difficult and often subjective. This study used a workflow time-based task analysis approach while performing cerebral angiography. METHODS: Eight angiographies performed by a senior neuroradiologist and eight performed by a junior neuroradiologist were compared. Dedicated software with specific terminology was used to record the tasks. Procedures were subdivided into phases, each comprising multiple tasks. Each task was defined as a triplet, associating an action, an instrument and an anatomical structure. The duration of each task was the metric. Total duration of the procedure, task duration and the number of times a task was repeated were identified. The focus was on tasks using fluoroscopy and for moving the X-ray table/tube. RESULTS: The total duration of tasks to complete the entire procedure was longer for the junior operators than for the seniors (P=0.012). The mean duration per task during the navigation phase was 86s for the juniors and 43s for the seniors (P=0.002). The total and mean durations of tasks involving the use of fluoroscopy were also longer for the juniors (P=0.002 and P=0.033, respectively). For tasks involving the table/tube, the total and mean durations were again longer for the juniors (P=0.019 and P=0.082, respectively). CONCLUSION: This approach allows reliable skill assessment in the radiology OR and comparison of junior and senior competencies during cerebral diagnostic angiography. This new tool can improve the quality and safety of procedures, and facilitate the learning process for neuroradiologists

    Interaction between intravenous thrombolysis and clinical outcome between slow and fast progressors undergoing mechanical thrombectomy: a post-hoc analysis of the SWIFT-DIRECT trial.

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    BACKGROUND In proximal occlusions, the effect of reperfusion therapies may differ between slow or fast progressors. We investigated the effect of intravenous thrombolysis (IVT) (with alteplase) plus mechanical thrombectomy (MT) versus thrombectomy alone among slow versus fast stroke progressors. METHODS The SWIFT-DIRECT trial data were analyzed: 408 patients randomized to IVT+MT or MT alone. Infarct growth speed was defined by the number of points of decay in the initial Alberta Stroke Program Early CT Score (ASPECTS) divided by the onset-to-imaging time. The primary endpoint was 3-month functional independence (modified Rankin scale 0-2). In the primary analysis, the study population was dichotomized into slow and fast progressors using median infarct growth velocity. Secondary analysis was also conducted using quartiles of ASPECTS decay. RESULTS We included 376 patients: 191 IVT+MT, 185 MT alone; median age 73 years (IQR 65-81); median initial National Institutes of Health Stroke Scale (NIHSS) 17 (IQR 13-20). The median infarct growth velocity was 1.2 points/hour. Overall, we did not observe a significant interaction between the infarct growth speed and the allocation to either randomization group on the odds of favourable outcome (P=0.68). In the IVT+MT group, odds of any intracranial hemorrhage (ICH) were significantly lower in slow progressors (22.8% vs 36.4%; OR 0.52, 95% CI 0.27 to 0.98) and higher among fast progressors (49.4% vs 26.8%; OR 2.62, 95% CI 1.42 to 4.82) (P value for interaction <0.001). Similar results were observed in secondary analyses. CONCLUSION In this SWIFT-DIRECT subanalysis, we did not find evidence for a significant interaction of the velocity of infarct growth on the odds of favourable outcome according to treatment by MT alone or combined IVT+MT. However, prior IVT was associated with significantly reduced occurrence of any ICH among slow progressors whereas this was increased in fast progressors

    ADAPT technique with ACE68 and ACE64 reperfusion catheters in ischemic stroke treatment: results from the PROMISE study.

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    The recent randomized trials demonstrated the benefit of mechanical thrombectomy in stroke therapy. However, treatment using different strategies is an ongoing area of investigation. The PROMISE study analyzed the safety and effectiveness of the Penumbra System with the ACE68 and ACE64 reperfusion catheters in aspiration thrombectomy of stroke, using A Direct Aspiration First Pass Technique (ADAPT). PROMISE was a prospective study which enrolled 204 patients with intracranial anterior circulation large vessel occlusion (LVO) ischemic stroke in 20 centers from February 2016 to May 2017. Initial treatment was with the ACE68/ACE64 catheters within 6 hours of symptom onset. Imaging and safety review was performed by an independent Core Laboratory and a Clinical Events Committee. The primary angiographic outcome was revascularization to mTICI 2b-3 at immediate post-procedure and the primary clinical outcome was 90-day modified Rankin Scale (mRS) score ≀2. Safety assessment included device- and procedure-related serious adverse events (SAEs), symptomatic intracranial hemorrhage (sICH), mortality, and embolization of new territory (ENT). Enrolled patients had a median age of 74 (IQR 65-80) years and a median admission NIHSS of 16 (IQR 11-20). The post-procedure mTICI 2b-3 revascularization rate was 93.1% and the 90-day mRS 0-2 rate was 61%. Device- and procedure-related SAEs at 24 hours occurred in 1.5% and 3.4%, respectively, 90-day mortality was 7.5%, sICH occurred in 2.9% while ENT occurred in 1.5%. For frontline therapy of LVO stroke, the ACE68/ACE64 catheters for aspiration thrombectomy were found to be safe and showed similar efficacy to randomized trials using other revascularization techniques. NCT02678169; Pre-results

    Time to treatment with bridging intravenous alteplase before endovascular treatment:subanalysis of the randomized controlled SWIFT-DIRECT trial.

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    BACKGROUND We hypothesized that treatment delays might be an effect modifier regarding risks and benefits of intravenous thrombolysis (IVT) before mechanical thrombectomy (MT). METHODS We used the dataset of the SWIFT-DIRECT trial, which randomized 408 patients to IVT+MT or MT alone. Potential interactions between assignment to IVT+MT and expected time from onset-to-needle (OTN) as well as expected time from door-to-needle (DTN) were included in regression models. The primary outcome was functional independence (modified Rankin Scale (mRS) 0-2) at 3 months. Secondary outcomes included mRS shift, mortality, recanalization rates, and (symptomatic) intracranial hemorrhage at 24 hours. RESULTS We included 408 patients (IVT+MT 207, MT 201, median age 72 years (IQR 64-81), 209 (51.2%) female). The expected median OTN and DTN were 142 min and 54 min in the IVT+MT group and 129 min and 51 min in the MT alone group. Overall, there was no significant interaction between OTN and bridging IVT assignment regarding either the functional (adjusted OR (aOR) 0.76, 95% CI 0.45 to 1.30) and safety outcomes or the recanalization rates. Analysis of in-hospital delays showed no significant interaction between DTN and bridging IVT assignment regarding the dichotomized functional outcome (aOR 0.48, 95% CI 0.14 to 1.62), but the shift and mortality analyses suggested a greater benefit of IVT when in-hospital delays were short. CONCLUSIONS We found no evidence that the effect of bridging IVT on functional independence is modified by overall or in-hospital treatment delays. Considering its low power, this subgroup analysis could have missed a clinically important effect, and exploratory analysis of secondary clinical outcomes indicated a potentially favorable effect of IVT with shorter in-hospital delays. Heterogeneity of the IVT effect size before MT should be further analyzed in individual patient meta-analysis of comparable trials. TRIAL REGISTRATION NUMBER URL: https://www. CLINICALTRIALS gov ; Unique identifier: NCT03192332

    Flow Diversion : from basic science to clinical studies

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    Les avancĂ©es technologiques endovasculaires des derniĂšres dĂ©cennies ont Ă©tĂ© nombreuses ; la diversion de flux en fait partie. Lorsqu’une nouvelle approche permet de traiter de façon efficace et sĂ»re un certain nombre de patients prĂ©sentant des dĂ©fis jusque-lĂ  difficiles Ă  surmonter, son adoption en pratique clinique peut-ĂȘtre prĂ©coce, voire prĂ©maturĂ©e. Nous avons dans un premier travail rĂ©alisĂ© une revue systĂ©matique sur les stents dits «Flow Diverters» (FD) et les modĂšles animaux. Puis nous avons menĂ© quatre expĂ©rimentations animales Ă©valuant l’efficacitĂ© des FDs dans diffĂ©rents modĂšles d’anĂ©vrismes canins adaptĂ©s Ă  l’hypothĂšse de travail par l’application d’une mĂ©thodologie rigoureuse. Nous avons Ă©tĂ© en mesure de montrer que la technique de diversion de flux est plus Ă  mĂȘme d’occlure les anĂ©vrismes avec de petits collets, des anĂ©vrismes dont la branche couverte par le FD est occluse, ou encore quand la porositĂ© du FD en regard de l’anĂ©vrisme est diminuĂ©e par l’opĂ©rateur. Dans le sixiĂšme travail, nous avons expĂ©rimentĂ© les rĂ©sultats de la mise en place d’un clip chirurgical sur ces FDs avant d’en dĂ©conseiller la pratique. Puis nous avons Ă©tudiĂ© la variabilitĂ© dans la dĂ©cision des opĂ©rateurs d’implanter un FD pour le traitement d’un anĂ©vrisme Ă  l’aide d’un questionnaire et ainsi montrĂ© l’importante variabilitĂ© prĂ©sente. Enfin nous rapportons le design de l’étude randomisĂ©e, pragmatique, multicentrique FIAT (Flow diversion In Aneurysm Treatment) ainsi que ces rĂ©sultats.Flow Diversion is one of the relevant technical improvements of the past decade in the endovascular treatment of cerebral aneurysms. When the efficacy and safety of a new tool allow treating challenging aneurysms, this adoption in daily practice can be fast even if the benefit of use is not clearly, scientifically show. We performed a systematic review of studies of these stents called “Flow Diverters” (FD) in animal models. Then we performed 4 animal studies in models we create in order to isolate the propriety of the FD we wanted to study. By using this methodology, we have been able to show that Flow Diversion is more likely to occlude small neck aneurysms, aneurysms in which the jailed branch has been occluded, or when the operator compact the FD in order to decrease the porosity of the device. In a 6th study, we test the result of the use of a clip to occlude a FD. Regarding the results of the test, we recommand to avoid clipping FDs.Then by using a questionaire; we showed the poor agreement of using FD in daily practice by using clinical vignettes. Then we presented the design and the result of the first randomized clinical study on flow diverters FIAT (Flow diversion In Aneurysm Treatment)

    La diversion de flux dans le traitement des anévrismes cérébraux : des études pré-cliniques aux études cliniques

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    Flow Diversion is one of the relevant technical improvements of the past decade in the endovascular treatment of cerebral aneurysms. When the efficacy and safety of a new tool allow treating challenging aneurysms, this adoption in daily practice can be fast even if the benefit of use is not clearly, scientifically show. We performed a systematic review of studies of these stents called “Flow Diverters” (FD) in animal models. Then we performed 4 animal studies in models we create in order to isolate the propriety of the FD we wanted to study. By using this methodology, we have been able to show that Flow Diversion is more likely to occlude small neck aneurysms, aneurysms in which the jailed branch has been occluded, or when the operator compact the FD in order to decrease the porosity of the device. In a 6th study, we test the result of the use of a clip to occlude a FD. Regarding the results of the test, we recommand to avoid clipping FDs.Then by using a questionaire; we showed the poor agreement of using FD in daily practice by using clinical vignettes. Then we presented the design and the result of the first randomized clinical study on flow diverters FIAT (Flow diversion In Aneurysm Treatment).Les avancĂ©es technologiques endovasculaires des derniĂšres dĂ©cennies ont Ă©tĂ© nombreuses ; la diversion de flux en fait partie. Lorsqu’une nouvelle approche permet de traiter de façon efficace et sĂ»re un certain nombre de patients prĂ©sentant des dĂ©fis jusque-lĂ  difficiles Ă  surmonter, son adoption en pratique clinique peut-ĂȘtre prĂ©coce, voire prĂ©maturĂ©e. Nous avons dans un premier travail rĂ©alisĂ© une revue systĂ©matique sur les stents dits «Flow Diverters» (FD) et les modĂšles animaux. Puis nous avons menĂ© quatre expĂ©rimentations animales Ă©valuant l’efficacitĂ© des FDs dans diffĂ©rents modĂšles d’anĂ©vrismes canins adaptĂ©s Ă  l’hypothĂšse de travail par l’application d’une mĂ©thodologie rigoureuse. Nous avons Ă©tĂ© en mesure de montrer que la technique de diversion de flux est plus Ă  mĂȘme d’occlure les anĂ©vrismes avec de petits collets, des anĂ©vrismes dont la branche couverte par le FD est occluse, ou encore quand la porositĂ© du FD en regard de l’anĂ©vrisme est diminuĂ©e par l’opĂ©rateur. Dans le sixiĂšme travail, nous avons expĂ©rimentĂ© les rĂ©sultats de la mise en place d’un clip chirurgical sur ces FDs avant d’en dĂ©conseiller la pratique. Puis nous avons Ă©tudiĂ© la variabilitĂ© dans la dĂ©cision des opĂ©rateurs d’implanter un FD pour le traitement d’un anĂ©vrisme Ă  l’aide d’un questionnaire et ainsi montrĂ© l’importante variabilitĂ© prĂ©sente. Enfin nous rapportons le design de l’étude randomisĂ©e, pragmatique, multicentrique FIAT (Flow diversion In Aneurysm Treatment) ainsi que ces rĂ©sultats

    Évaluation du stent Neuroform3TM dans le traitement des anĂ©vrismes cĂ©rĂ©braux : l'Ă©tude française SENAT, prospective, consĂ©cutive et multicentrique

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    Contexte et Objectifs : La reconstruction de l'artÚre porteuse grùce à un stent est de plus en plus utilisée pour traiter les anévrismes à collet large ou situés au niveau des bifurcations. L'objectif principal de SENAT était d'étudier la morbi-mortalité péri-opératoire et à moyen terme (12-18 mois) lors de l'utilisation du stent Neuroform3TM. L'objectif secondaire était d'étudier la stabilité des résultats anatomiques à 12-18 mois aprÚs traitement. Matériel et Méthode : SENAT est une étude consécutive, prospective, multicentrique. Les résultats techniques ainsi que les complications et leur retentissement clinique ont été décrits. Puis la stabilité anatomique a été évaluée de façon angiographique à 12-18 mois. Résultats : Cent treize stents ont été utilisés pour traiter 107 anévrismes chez 107 patients. La taille moyenne de l'anévrisme était de 6,21 mm et le diamÚtre moyen du collet anévrismal de 4,55 mm. Le taux d'occlusion complÚte à la fin de la procédure était de 67,7%. Le taux de thrombose progressive à 12-18 mois était de 14% et le taux de récidive (recanalisation) de 9,7%. Le taux de retraitement était de 4%. Le taux de complications thromboemboliques (TE) dans la période péri-opératoire était de 3,7% et le taux de TE retardés était de 3%. La mortalité à 12-18 mois était de 1% et le taux de morbidité permanente était de 1%. Conclusion : Cette technique permet d'atteindre un taux élevé d'occlusion avec un taux faible de retraitement malgré une population d'anévrismes à collet large. La morbi-mortalité de cette technique ainsi que le taux de TE est faible. L'utilisation du stent Neuroform 3TM n'augmente pas le risque de complications symptomatiques ainsi que la morbi-mortalité de la procédure. De plus son utilisation permet d'atteindre un haut niveau d'occlusion

    Flow Diversion : from basic science to clinical studies

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    Les avancĂ©es technologiques endovasculaires des derniĂšres dĂ©cennies ont Ă©tĂ© nombreuses ; la diversion de flux en fait partie. Lorsqu’une nouvelle approche permet de traiter de façon efficace et sĂ»re un certain nombre de patients prĂ©sentant des dĂ©fis jusque-lĂ  difficiles Ă  surmonter, son adoption en pratique clinique peut-ĂȘtre prĂ©coce, voire prĂ©maturĂ©e. Nous avons dans un premier travail rĂ©alisĂ© une revue systĂ©matique sur les stents dits «Flow Diverters» (FD) et les modĂšles animaux. Puis nous avons menĂ© quatre expĂ©rimentations animales Ă©valuant l’efficacitĂ© des FDs dans diffĂ©rents modĂšles d’anĂ©vrismes canins adaptĂ©s Ă  l’hypothĂšse de travail par l’application d’une mĂ©thodologie rigoureuse. Nous avons Ă©tĂ© en mesure de montrer que la technique de diversion de flux est plus Ă  mĂȘme d’occlure les anĂ©vrismes avec de petits collets, des anĂ©vrismes dont la branche couverte par le FD est occluse, ou encore quand la porositĂ© du FD en regard de l’anĂ©vrisme est diminuĂ©e par l’opĂ©rateur. Dans le sixiĂšme travail, nous avons expĂ©rimentĂ© les rĂ©sultats de la mise en place d’un clip chirurgical sur ces FDs avant d’en dĂ©conseiller la pratique. Puis nous avons Ă©tudiĂ© la variabilitĂ© dans la dĂ©cision des opĂ©rateurs d’implanter un FD pour le traitement d’un anĂ©vrisme Ă  l’aide d’un questionnaire et ainsi montrĂ© l’importante variabilitĂ© prĂ©sente. Enfin nous rapportons le design de l’étude randomisĂ©e, pragmatique, multicentrique FIAT (Flow diversion In Aneurysm Treatment) ainsi que ces rĂ©sultats.Flow Diversion is one of the relevant technical improvements of the past decade in the endovascular treatment of cerebral aneurysms. When the efficacy and safety of a new tool allow treating challenging aneurysms, this adoption in daily practice can be fast even if the benefit of use is not clearly, scientifically show. We performed a systematic review of studies of these stents called “Flow Diverters” (FD) in animal models. Then we performed 4 animal studies in models we create in order to isolate the propriety of the FD we wanted to study. By using this methodology, we have been able to show that Flow Diversion is more likely to occlude small neck aneurysms, aneurysms in which the jailed branch has been occluded, or when the operator compact the FD in order to decrease the porosity of the device. In a 6th study, we test the result of the use of a clip to occlude a FD. Regarding the results of the test, we recommand to avoid clipping FDs.Then by using a questionaire; we showed the poor agreement of using FD in daily practice by using clinical vignettes. Then we presented the design and the result of the first randomized clinical study on flow diverters FIAT (Flow diversion In Aneurysm Treatment)
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