1,721,004 research outputs found
Comparison Between Three Commonly Used Large-Bore Aspiration Catheters in Terms of Successful Recanalization and First-Passage Effect
No full textObjectivesTo compare three commonly used large-bore aspiration catheters in terms of final successful recanalization rate and first-passage successful and complete recanalization rates (the so called "first-passage effect").Materials and methodsit is an observational retrospective multicenter study conducted in three Italian high-volume tertiary stroke centers between January 2017 and May 2019. The study population included all consecutive patients with an ischemic stroke due to middle cerebral artery occlusion (M1 segment only) that underwent intra-arterial mechanical thrombectomy with contact aspiration as first-line strategy within 24 hours from symptoms onset.ResultsThree hundred twenty-one patients were included in the study. Multivariable logistic regression analysis comparing the three catheters revealed no differences in terms of successful recanalization. Sofia 6 Plus catheter was associated with better first-passage successful recanalization [OR, 9.09; 95% CI, 2.66-31.03] (p<0.001) and first-passage complete recanalization [OR: 3.73; 95% CI: 1.43-9.72] (p=0.007) whereas rt-PA was associated with worse first-passage recanalization [OR: 0.52; 95% CI: 0.29-0.93] (p=0.028).ConclusionsNo differences between the three catheters were reported in terms of successful recanalization. Sofia 6 Plus has proven to be superior in achieving both successful and complete first-passage recanalization. Conversely, rt-PA was found to be a negative predicting factor of first-passage effect
Foot Dorsal and Plantar Flexion to Enhance Crossing of Tortuous Highly-Calcific Ankle Vessels During Lower Limb Revascularization Procedures: A Technical Note
No full textpurpose to describe a crossing technique of stenotic/occluded and tortuous highly calcific ankle vessels during complex percutaneous limb salvage intervention in diabetic patients with ischaemic foot ulcers (rutherford 5 and 6).technique we propose a simple technique to achieve "straightening" of the tortuous vessel and allow safe devices passage into the foot arteries, patients were asked to hold their foot in plantar or dorsal flexion, accordingly to the treated artery. if unable to do so, an equipe member executed the manoeuvre on their behalf. results the technique was applied in 148 cases, with a success rate of 81% (120/148). no complications related to the manoeuvre were observed. conclusion crossing of tortuous distal crural vessels can be challenging in diabetic patients; in our experience, this technique can be a useful tool to obtain a successful recanalization in complex procedures with high risk of failure
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Foetal Radiation Dose During Prophylactic Occlusion Balloon Placement for Morbidly Adherent Placenta
No full textObjective To assess foetal absorbed radiation dose (FAD)
during prophylactic occlusion balloon catheter (POBC) placement
before surgery for morbidly adherent placenta (MAP).
Methods Retrospective cohort study of women with MAP
undergoing POBC before surgery. Women were divided
into two groups. Group 1 treated between 2008 and 2011,
Group 2 between 2012 and 2014 when fluoroscopy pulse
rate reduced from 7.5 to 2 pulses per second. Median and
interquartile range (IQR) of dose area product (DAP) and
FAD were compared using the Mann-U-Whitney test. FAD
was calculated using the PCXMC Monte-Carlo calculation.
All procedures were performed using the same equipment
(Siemens Axiom Artis dTA) by the same experienced interventional
radiology team.
Results Thirty-four women underwent POBC. 16 procedures
were performed in Group 1 and 18 in Group 2. Median
DAP overall was 1025.10 lGym2 (IQR 532.1–1775.3):
Group 1, 1713.25 lGym2 (IQR 1164.5–2274.5) and Group
2, 660.70 lGym2 (IQR 440.9–1020.9) (p= 0.027). Median
FAD overall was 4.65 mGy (IQR 2.7–8.2): Group 1,
6.25 mGy (IQR 4.4–10.6) and Group 2, 3.05 mGy (IQR
2.0–5.4) (p= 0.031).
Conclusions FAD during POBC insertion is low overall.
The only change between the two groups was in pulsed
fluoroscopy rate which resulted in a significant reduction in
FAD. This reinforces the importance of implementation of
dose reduction techniques
Direct ultrasound-guided puncture of vertebral artery V2 segment during mechanical thrombectomy
No full textan 83-year-old man experienced left upper limb uncontrolled movements preceded by intense gasping during night rest, which progressed to unconsciousness and respiratory arrest requiring intubation. he was diagnosed with acute stroke due to distal occlusion of the basilar artery and received indication for endovascular thrombectomy. standard endovascular approach includes percutaneous puncture of the femoral or radial arteries; however, the presence of unfavourable vascular anatomies (stenotic origin and tortuosity) did not allow catheterisation of the intracranial vessels through conventional access, and based on the consistent time lapse from onset of symptoms and deterioration of the clinical condition, a direct right vertebral artery ultrasound-guided puncture was performed. after one attempt of a triaxial technique, a complete recanalisation of the basilar artery and of its distal branches was achieved. direct percutaneous puncture of the vertebral artery represents a rescue access strategy for treatment of posterior circulation stroke when other routes are not feasible
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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