1,721,029 research outputs found
Percutaneous treatment in iliac artery occlusion: Long-term results
No full textWe evaluated the long-term results of recanalization with primary stenting for patients with long and complex iliac artery occlusions. This was a retrospective nonrandomised study. Between 1995 and 1999, 138 patients underwent recanalization of an occluded iliac artery with subsequent stenting. Patency results were calculated using Kaplan-Meier analysis. The mean length of follow-up was 108 months. Variables affecting primary stent patency such as patient age; stent type and diameter; lesion site, shape, and length; Society of Cardiovascular and Interventional Radiology classification; total runoff score; Fontaine classification; and cardiovascular risk factors were analysed using Breslow test. These variables were then evaluated for their relation to stent patency using Cox proportional hazards test. Technical success was 99%. Primary patency rates were 90% (SE .024), 85% (SE .029), 80% (SE .034), and 68% (SE .052) at 3, 5, 7, and 10 years, respectively. Lesion site (p = 0.022) and stent diameter (p = 0.028) were shown to have a statistically significant influence on primary stent patency. Long-term results of iliac recanalization and stent placement were excellent, without major complications, even in highly complex vascular obstructions. A primary endovascular approach appears to be justified in the majority of patients as a less invasive alternative treatment to surgery. In any case, a first-line interventional approach should be considered in elderly patients or in patients with severe comorbidities
Long-term benefit of renal denervation on blood pressure control in a patient with hemorrhagic stroke
Full text linkA 49-year-old man with malignant hypertension had been admitted with hemorrhagic stroke. Refractory hypertension had been observed during hospitalization and the decision had been made to perform renal denervation. A significant blood pressure reduction was obtained immediately after renal denervation and persists at 2-year follow-up. This case demonstrates the long-term sustained efficacy of renal denervation performed in the acute phase of hemorrhagic stroke. In addition, it supports the notion that renal denervation-induced normalization of blood pressure may contribute to better outcomes in a challenging setting such as intracranial bleeding
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
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
Going public on social media: The effects of thousands of Instagram followers on users with a high need for social approval
No full textWhy should people opt for a public profile on a new social media? Across two studies, we tested the hypothesis that receiving tangible positive feedback on a famous social media site causes people with a high need for approval to be more willing to create a public profile on a new social media. In Study 1 (N = 200), we hypothesized and found (a) a positive association between young adults’ need for social approval and their general tendency to go public on social media, and (b) an association of the combination of high need for approval and a high number of Instagram followers, with a higher willingness to create a public profile on a new social site. In Study 2 (N = 443), we experimentally replicated this latest finding, demonstrating that obtaining thousands of Instagram followers leads users with a high need for social approval—and not those with a low need for approval—to experience more positive feelings, perceive more appreciation from others, and, consequently, report an augmented willingness to create a public profile on a new social networking site. On the other hand, participants high in need for approval that obtained just a few hundred followers on Instagram reported more negative feelings and declared to be comparatively less willing to set the new social media profile to public, showing a defensive reaction of closure to future social media feedback. Implications of these results for basic research and applied fields are discussed
Intravascular ultrasound assisted carotid artery stenting: randomized controlled trial. Preliminary results on 60 patients.
No full textAIMS:
The primary aim is the evaluation of the usefulness of intravascular ultrasound (IVUS) in the identification of otherwise unnoticed complications during carotid stenting. The secondary aim is the evaluation of the impact of IVUS assistance in the procedural outcomes and long-term patency rates of carotid artery stenting.
MATERIALS AND METHODS:
Sixty patients who underwent carotid artery stenting (CAS) during a 14-month period were evaluated prospectively. Thirty patients (50%) underwent IVUS assisted CAS, 30 patients (50%) underwent CAS using angiography as the unique diagnostic tool. All patients were enrolled through a primary duplex ultrasound evaluation; as a secondary evaluation, 54 patients (90%) underwent a preprocedural magnetic resonance angiography, whereas six patients (10%) underwent computed tomography-angiography. Patients with preocclusive stenoses (≥85%) were excluded. Mean follow-up was 23 ± 5.3 months.
RESULTS:
No periprocedural or late complications were observed. No statistical significance was observed in long-term stent patency between the two groups. Mean procedural time length of IVUS-assisted procedures was 10.3 ± 5 min longer than non-IVUS-assisted procedures. Virtual histology (VH) IVUS evaluation of plaque morphology led to a different stent choice in three patients. In two cases, the IVUS assessment revealed a suboptimal stent deployment, solved by angioplasty; in one patient VH-IVUS detected plaque protrusion through stent cells, immediately treated by manual aspiration.
CONCLUSIONS:
Though not recommended as a routine intraprocedural evaluation, IVUS may be useful for a real-time CAS control when treating challenging plaques, such as 'soft' or lipidic ones or those prone to rupture, or whenever an intraprocedural morphologic evaluation is required for the appropriate stent choice, or when higher embolic risk is evaluated
Treatment of type II endoleak after endovascular aneurysm repair: The role of selective vs. nonselective transcaval embolization
No full textPurpose: To assess the technical and midterm results in the treatment of type II endoleaks comparing nonselective (nTCE) vs. selective (sTCE) transcaval embolization.Methods: During a 4-year period, 26 patients (18 men; median age 73 years, range 68-78) underwent direct transcaval aneurysm puncture followed by embolization of the sac (nTCE, n) or of the feeding vessels (sTCE, n=17). Intrasac pressure was recorded immediately after aneurysm sac puncture and at the end of the procedure. Technical success was defined as successful deployment of embolization material in the sac or in the feeding vessel. Clinical success was defined as absence of endoleak with stabilization of the sac on follow-up CTA.Results: Technical success was 100% in the 9 patients treated with nTCE. Mean intrasac pressures before and after nTCE were 58.6 +/- 18.4 (range 51-105) and 6.5 +/- 1.2 mmHg (range 4-9), respectively. Over a mean 25.9 +/- 11.0 months of follow-up, 4 patients developed recurrent endoleak at a mean 9.7 +/- 3.9 months. Three patients were subsequently treated with sTCE, while the last patient underwent emergency surgery for aneurysm rupture due to an enlarging sac 5 months after nTCE. The 20 patients in the sTCE group had a successful procedure with no recurrence in a follow-up of 24.1 +/- 7.2 months. Mean intrasac pressure was reduced after sTCE from 63.6 +/- 15.2 mmHg (range 43-120) to 7.8 +/- 2.3 mmHg (range 5-12).Conclusion: The selective TCE approach appears to be a feasible and effective primary therapeutic option for treating type II endoleak
Treatment of Symptomatic High-Flow Female Varicoceles with Stop-flow Foam Sclerotherapy
No full textTo assess the efficacy of stop-flow foam sclerotherapy (SFFS) in high-flow pelvic varicoceles using 3 % sodium tetradecyl sulfate (STS) foam.Our institutional review board granted approval and waived informed consent for this retrospective study of 26 patients (mean age 37.3 years, range 23-46 years) with pelvic congestion syndrome (PCS) who had high-outflow venous collaterals treated by SFFS between June 2005 and June 2011 in our department. PCS was diagnosed by physical and transvaginal color Doppler ultrasound examination, while high-outflow venous collaterals were detected at selective ovarian venography. SFFS was performed by injection of 3 % STS foam into the pelvic varices after balloon occlusion of the major venous vessels (hypogastric and/or ovarian veins) to which the high-outflow venous collaterals were tributary. Follow-up was performed at 1, 3, 6, and 12 months by physical and transvaginal color Doppler ultrasound examination and by a questionnaire-based assessment of pain using a symptom severity score.The procedure was technically successful in all patients. After the injection of 3 % STS foam, all patients had a colic like pain that spontaneously resolved after 5 min. During follow-up, no recurrences of PCS were detected. Significant improvement of symptoms (Student's t test P < 0.01) was observed at 1, 3, 6, and 12 months.SFFS using 3 % STS foam is a safe and effective treatment for high-flow female varicoceles and should be considered as an alternative to other endovascular and surgical options
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