29 research outputs found

    The Proliferation REduction with Vascular ENergy Trial (PREVENT)

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    PREVENT was the first prospective, randomized placebo-controlled study of intracoronary beta radiotherapy with (32)P. A total of 105 patients with de novo or restenotic lesions, treated by stenting or balloon angioplasty, received 0 (control), 16, 20, or 24 Gy to a depth of 1 mm beyond the lumen surface. Rates of restenosis (50% diameter stenosis or more) were significantly lower in radiotherapy patients at the target site (8% compared with 39%, P = 0.012) and at the target site plus adjacent segments (22% compared with 50%, P = 0.018). Stenosis adjacent to the target site and late thrombotic events reduced the overall clinical benefit of radiotherapy

    Porównanie trójwymiarowej i dwuwymiarowej analizy ilościowej tętnic wieńcowych w odniesieniu do pomiaru długości segmentów wieńcowych u pacjentów poddawanych diagnostycznej koronarografii

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    Cel: Określenie, czy trójwymiarowa, ilościowa analiza angiograficzna naczyń wieńcowych (3D QCA) ma przewagę nad standardową oceną dwuwymiarową (2D QCA) polegającą na zwiększeniu dokładności i precyzji pomiarów długości oraz wyeliminowaniu skrócenia typowego dla analiz 2D. Materiał i metody: Wykonano ogółem 800 pomiarów długości odcinka pomiędzy markerami na prowadnikach wieńcowych wprowadzonych do tętnicy wieńcowej (8 długości na prowadniku w zakresie 5–40 mm) z zastosowaniem oprogramowania 3D i standardowego oprogramowania 2D w porównaniu ze znanymi odległościami znaczników na prowadniku wieńcowym u 21 pacjentów poddanych koronarografii. Wyniki: W analizie 2D QCA pomiary były z reguły zaniżone w stosunku do rzeczywistej długości mierzonego odcinka, przy czym wielkość błędu wzrastała wraz z bezwzględną długością mierzonego odcinka. Analizy za pomocą 3D QCA wykazały minimalne różnice pomiarów w stosunku do rzeczywistych odległości pomiędzy markerami w całym zakresie badanych długości. Wnioski: Technika 3D QCA minimalizuje błędy pomiarów długości związane z artefaktem skrócenia obrazowego obiektu (foreshortening) typowego dla 2D QCA wykazuje minimalne odstępstwa od rzeczywistych długości w stosunku do analiz 2D QCA. 3D QCA ma szczególną przewagę w przypadku większych długości.Aim: To determine if three-dimensional quantitative coronary angiographic analysis (3D QCA) provides an advantage over twodimensional (2D QCA) by increasing accuracy and precision of length measurements through compensating for foreshortening inherent to 2D images. Material and methods: A total of 800 inter-marker length measurements were performed (8 per wire, 5-40 mm) with novel 3D software and standard 2D software and compared with the true lengths of the inter-marker distances on the wire in coronary vessels of 21 patients recruited. Results: 2D QCA generally underestimated true length in comparison to 3D, and the discrepancy increased with absolute length. In contrast, 3D QCA showed a minimal difference from true length over the examined range of lengths. Conclusions: 3D QCA minimizes errors in length measurements associated with foreshortening, shows minimal difference from true length, and performs significantly better in comparison to 2D QCA. The advantage of 3D QCA is more pronounced at longer lengths

    Two-year longitudinal evaluation of a second-generation thin-strut sirolimus-eluting bioresorbable coronary scaffold with hybrid cell design in porcine coronary arteries

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    Background: The first commercially available bioresorbable scaffold (BRS) had a strut thickness of 156 microns. As such, it had the potential for delivery challenges and higher thrombogenicity. The aim herein, is to evaluate biomechanical performance, pharmacokinetics and vascular healing of a novel thin strut (100 μm) sirolimus eluting BRS (MeRes-100, Meril Life Sciences, Gujarat, India) against the once clinically used BRS (Absorb BVS, Abbott, Santa Clara, CA) in porcine coronary arteries. Methods: Following device implantation, angiographic and optical coherence tomography (OCT) evaluation were performed at 45, 90, 180 days, 1 year and 2 years. Histological evaluation was per­formed at 30, 90 and 180 days. Results: At 2 years, both lumen (MeRes-100 7.07 ± 1.82 mm2 vs. Absorb BVS 7.57 ± 1.39 mm2, p = NS) and scaffold areas (MeRes-100 9.73 ± 1.80 mm2 vs. Absorb BVS 9.67 ± 1.25 mm2, p = NS) were comparable between tested and control scaffolds. Also, the late lumen area gain at 2 years was similar in both groups tested (MeRes-100 1.03 ± 1.98 mm2 vs. Absorb BVS 0.85 ± 1.56 mm2, p = NS). Histologic examination up to 6 months showed comparable healing and inflammation profiles for both devices. Conclusions: The novel sirolimus-eluting BRS with thinner struts and hybrid cell design showed similar biomechanical durability and equivalent inhibition of neointimal proliferation when compared to the first-ever Absorb BVS up to 2 years in normal porcine coronary arteries

    Search for single production of vector-like quarks decaying into Wb in pp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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    Charged-particle distributions at low transverse momentum in s=13\sqrt{s} = 13 TeV pppp interactions measured with the ATLAS detector at the LHC

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    Search for dark matter in association with a Higgs boson decaying to bb-quarks in pppp collisions at s=13\sqrt s=13 TeV with the ATLAS detector

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    Measurements of top-quark pair differential cross-sections in the eμe\mu channel in pppp collisions at s=13\sqrt{s} = 13 TeV using the ATLAS detector

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    Measurement of the W boson polarisation in ttˉt\bar{t} events from pp collisions at s\sqrt{s} = 8 TeV in the lepton + jets channel with ATLAS

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    Measurement of jet fragmentation in Pb+Pb and pppp collisions at sNN=2.76\sqrt{{s_\mathrm{NN}}} = 2.76 TeV with the ATLAS detector at the LHC

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