bluuebunny/crossref_metadata_2025_split huggingface dataset:
Gasless Videoendoscopic Implantation of an Aortobifemoral Vascular Prosthesis via a Transperitoneal versus Extraperitoneal Approach: An Experimental Study
Authors: Bruns Christiane , Wolfgarten Bernd , Walter Michael , Pichlmaier Heinz , Koebke Jürgen 
Published: March 2015

Purpose: To report progress in the development of a new minimally invasive surgical technique for aortobifemoral grafting utilizing gasless videoendoscopy. Methods: In an experimental study, aortobifemoral Dacron vascular prostheses were implanted in 20 human cadavers using videoendoscopic techniques in both transperitoneal and extraperitoneal approaches. Rather than inducing pneumoperitoneum, the abdominal wall was elevated with an electrically powered lifting system. Results: Each approach was utilized in 10 cadavers for implantation of 20 aortobifemoral grafts under endoscopic guidance in a gasless field. Average operative time for the transperitoneal approach was 3.8 hours (range 3.0 to 5.5), slightly less than the average 4.1 hours (range 3.0 to 6.0) for the extraperitoneal access. Both access routes provided adequate visualization of the operative field. Conclusions: Advantages of gasless endoscopy include the use of conventional instruments and the potential benefits associated with a minimally invasive approach. Optical magnification facilitates suturing of the femoral anastomosis, improves examination of the vascular walls, and allows a more accurate suturing technique.
Endovascular Covered Stent Repair of an Intercostal Artery Patch Dehiscence from a Descending Thoracic Aortic Aneurysm Graft
Authors: Dorros Gerald , Avula Surendra , Fox Paul , Rhomberg Bernard , Werner Paul 
Published: March 2015

Purpose: To describe the use of endovascular techniques to repair a descending thoracic aortic pseudoaneurysm at a site of patch dehiscence. Methods and Results: A 63-year-old hypertensive, diabetic female with a 4-cm aneurysm in the descending thoracic aorta underwent surgical repair with a 35-mm Dacron graft. Dehiscence of the intercostal arterial patch produced a large, 6-cm-diameter pseudoaneurysm that extended into the left thoracic cavity. An endovascular repair was planned using a Dacron stent-graft. Despite induced hypotension and an exteriorized, stiff exchange wire to enhance control of the delivery balloon catheter, the initial attempt failed to close the suture line defect. A customized polytetrafluoroethylene-covered, balloon-expandable stent was successfully deployed using the original stent-graft as a landmark. At 6 months, the contrast-enhanced spiral computed tomographic scan showed patency of the stent-graft and resorption of the pseudoaneurysm. Conclusions: This communication describes the management of a surgical complication using balloon-expandable covered stents in contrast to either conventional surgery or self-expanding stent-grafts. Transesophageal ultrasound monitoring delineated the suture line leak, identified the position of the stent-grafts, and accurately demonstrated closure of the defect.
Sigmoid Sinus Thrombosis Associated with Internal Jugular Venous Occlusion: Direct Thrombolytic Treatment
Authors: Gurley Melissa B. , King Teresa S. , Tsai Fong Y. 
Published: March 2015

Purpose: To report our experience with transfemoral direct venous thrombolysis and angioplasty to treat central venous and dural sinus occlusion. The cases presented are rare examples of internal jugular occlusion associated with sigmoid sinus thrombosis. Methods and Results: Two middle-aged, symptomatic female patients were diagnosed with sigmoid sinus and internal jugular vein thrombosis. Venography was performed from a contralateral transfemoral approach, followed immediately by urokinase infusion directly to the occlusion using an intermittent “burst-bolus” technique. Successful thrombolysis of the sigmoid sinus and internal jugular vein was documented in both patients. In one case, a venous stenosis was treated with balloon angioplasty. Clinical signs and symptoms resolved in both patients. Conclusions: Occluded dural sinuses and central veins can be treated with direct administration of thrombolytic agents. When an underlying stenosis is identified, balloon dilation should be used to reduce the likelihood of recurrence.
Changing Aneurysmal Morphology after Endovascular Grafting: Relation to Leakage or Persistent Perfusion
Authors: Malina Martin , Ivancev Krasnodar , Chuter Timothy A.M. , Lindh Mats , Länne Toste , Lindblad Bengt , Brunkwall Jan , Risberg Bo 
Published: March 2015

Purpose: To relate changing abdominal aortic aneurysm (AAA) morphology after endovascular grafting to the presence of leakage, collateral perfusion, and other factors. Methods: Thirty-five patients who underwent successful AAA endovascular grafting were evaluated. Self-expanding Z-stents and Dacron grafts were applied in bifurcated and aortomonoiliac systems. Postoperative diameter changes were calculated from repeated spiral computed tomographic scans, angiograms, and ultrasonic phase-locked echo-tracking scans during a median 6-month follow-up (interquartile range [IQR] 3 to 12). Results: At 12 months, the diameters of completely excluded aneurysms had decreased 6 mm (IQR 2 to 11; p = 0.006). The proximal graft-anchoring stents had dilated 2 mm (IQR 0.5 to 3.3; p = 0.01). The aortic diameters immediately below the renal arteries but above the stents had not changed. Endoleakage and collateral perfusion (n = 13) were each associated with preserved aneurysm size and a 12 times higher risk of aneurysm dilation. After the leakage or the collateral perfusion had been treated, the aneurysm size decreased. Aneurysms with extensive intraluminal thrombi presented a reduced risk of leakage or perfusion. Conclusions: The diameters of endovascularly excluded AAAs decrease, except in cases of leakage or perfusion. Careful follow-up of patients with aortic endografts is necessary.
Successful Endoluminal Repair of Arterial Aneurysms by Wallstent Prosthesis and PTFE Graft: Preliminary Results with a New Technique
Authors: Krajcer Zvonimir , Diethrich Edward B. 
Published: March 2015

Purpose: To describe a new method of endovascular aneurysm exclusion using a Wallstent-PTFE vascular prosthesis in patients at high risk for surgery. Methods and Results: Two patients with significant comorbidities refused surgery in favor of endoluminal grafting for treatment of aneurysms in the abdominal aorta and popliteal artery, respectively. Both endovascular procedures were performed percutaneously with local anesthesia using a low-profile customized endograft constructed of thin-walled, predicted polytetrafluoroethylene (PTFE) graft mounted on a Wallstent. In both cases, the aneurysm was excluded from the arterial circulation; there were no postprocedural complications. Follow-up evaluation with appropriate imaging at 8 months (popliteal aneurysm) and 2 months (abdominal aneurysm) revealed no endoleaks. Conclusions: Our preliminary results indicate that the Wallstent-PTFE graft, with its smaller diameter and flexible design, offers significant advantages over currently available devices for repair of arterial aneurysms. This method obviates the need for general anesthesia or surgical exposure for arterial repair, which would increase the risk of the procedure in these patients.
Time-Related Alterations in Shape, Position, and Structure of Self-Expanding, Modular Aortic Stent-Grafts: A 4-year Single-Center Follow-up
Authors: Umscheid Thomas , Stelter Wolf J. 
Published: March 2015

Purpose: To report the nature and ramifications of structural and positional changes over time in tube and modular bifurcated aortic stent-grafts. Methods: Two hundred ninety-one patients received endovascular aortic grafts (primarily Stentor/Vanguard) between August 1994 and August 1998. Follow-up surveillance (clinical and laboratory examination, biplanar noncontrast radiography, and contrast-enhanced computed tomography) has been maintained on all patients for 4 years. Changes in the configuration and position of endografts have been noted and their sequelae charted. Results: Three types of endograft shape changes have been documented: mild — slight distortions visible on plain radiographs (n = 90, 31.0%), significant — angulations reaching 60° to 90° (n = 65, 22.3%), and severe — angulations ≥ 90° (n = 10, 3.4%). Changes in position never gave rise to late migration at the proximal attachment site, whereas at the distal ends, the endograft easily retracted from the iliac arteries (n = 8). Structural alterations (rupture of the stent frame, sutures, or fabric, and total graft disintegration) were more common in the original Stentor model. Shape, position, and structural alterations were mutually dependent and led to secondary endoleaks (n = 26) and graft limb thrombosis (n = 37). Late surgical conversion was necessary in 3 (1.0%) patients. Conclusions: Tortuosity of the native vessels is a source of complication in long-term follow-up just as it is during implantation. Given the late appearance of complications in this patient cohort, it would seem that the durability of an endograft cannot be evaluated with < 3 years of follow-up.
Influence of Age upon Complications of Carotid Artery Stenting
Authors: Chastain Hollace D. , Gomez Camilo R. , Iyer Sriram , Roubin Gary S. , Vitek Jiri J. , Terry John B. , Levine Ronald L. ,   UAB Neurovascular Angioplasty Team
Published: March 2015

Purpose: To examine the impact of age upon the development of neurological and major systemic complications during or after carotid artery stenting. Methods: We reviewed the complications that occurred in patients undergoing elective carotid stent implantation between September 1994 and August 1996. The study population was then divided into 3 groups according to age: ≥ 80 (group A), 75 to 79 (group B), and ≤ 74 (group C) years. The rates of death, major and minor stroke, and myocardial infarction were compared among the groups, as well as with the rates reported by the major carotid endarterectomy (CEA) trials. Results: During the study period, 182 patients (216 vessels) were treated with carotid stenting. There were 19 (10.4%) complications: 1 (0.5%) death, 2 (1.1%) major strokes, 15 (8.2%) minor strokes, and 1 (0.5%) myocardial infarction. Neurological complications were clearly related to increased age with rates of 25.0% in group A versus 8.6% in group C (p = 0.042). The overall per patient rate of death or major stroke was 1.6% (1.4% per vessel). Conclusions: Increasing age has a negative impact on the rate of complications in carotid stent patients. However, the majority of those complications are minor. The relative roles of medical therapy, stenting, and CEA in patients > 80 years of age must await the results of randomized trials.
Long-term Follow-up of Endoluminal Grafting for Aneurysmal and Occlusive Disease in the Superficial Femoral Artery
Authors: Rodriguez-Lopez Julio A. , Soler Liliana , Werner Alan , Martinez Edgar , Papazoglou Konstantine , Diethrich Edward B. 
Published: March 2015

Purpose: To examine the long-term outcome of patients treated with endoluminal grafts (ELGs) for aneurysmal and occlusive disease in the femoropopliteal (FP) segment. Methods: ELGs of radially expandable polytetrafluoroethylene with terminal Palmaz stents were used to form intimal conduits to revascularize lengthy occlusive disease and exclude aneurysms in the FP segment. Patient records were reviewed retrospectively for outcome. Results: Fifty-five (98%) of 56 ELGs were placed successfully in 51 patients treated from August 1993 to February 1996. Over a mean 36-month follow-up, 28 (50%) ELGs occluded. Half of these failures reflected early technical difficulties. There were 11 (20%) stent stenoses, 6 in the proximal stent and 5 in the distal device. The majority of the graft failures were treated with endovascular techniques; however, FP bypass was required in 7 (25%) patients, while 2 (7%) were not treated. Life-table analysis demonstrated 46% primary and 68% secondary patency rates at 24 months. Among demographic and procedural variables, only previous dilation or stent procedures in the target artery was associated with failure (p < 0.0001). Conclusions: The prototype ELG used in this series demonstrated durability similar to conventional surgical therapy utilizing synthetic material. Endoluminal grafting of FP lesions may be a more durable alternative to classical bypass once devices and techniques are refined.
Acute Rupture of an Aortic False Aneurysm Treated with a Stent-Graft
Authors: Schönholz Claudio , Donnini Fabian , Naselli Gandolfo , Pocovi Antonio , Parodi Juan C. 
Published: March 2015

Purpose: To report the use of an aortic endograft to treat a ruptured false aneurysm at the anastomosis of an aortofemoral bypass graft. Methods and Results: A 68-year-old man with a 30-year-old aorto-right femoral bypass and multiple comorbidities was admitted to the hospital complaining of acute abdominal pain. Imaging identified a 60-mm ruptured aortic false aneurysm with associated retroperitoneal hematoma, a 9-cm right femoral false aneurysm, and a calcified 23-mm left common iliac aneurysm. Two slightly overlapping Vanguard straight stent-grafts were implanted in the aorta and left common iliac artery in an emergency procedure owing to the patient's high surgical risk. The anastomotic false aneurysm and the bypass were excluded. A left-to-right femorofemoral bypass was performed to re-establish flow to the right femoral artery with ligation of the external iliac artery. The patient recovered uneventfully. He remained well with a successful repair until his death of a myocardial infarction 6 months after the procedure. Conclusions: Endovascular grafting can be used successfully for the urgent treatment of aortic false aneurysm rupture.
Needs of caregivers in heart failure management: A qualitative study
Authors: Wingham Jennifer , Frost Julia , Britten Nicky , Jolly Kate , Greaves Colin , Abraham Charles , Dalal Hayes 
Published: March 2015

Objectives To identify the needs of caregivers supporting a person with heart failure and to inform the development of a caregiver resource to be used as part of a home-based self-management programme. Methods A qualitative study informed by thematic analysis involving 26 caregivers in individual interviews or a focus group. Results Three distinct aspects of caregiver support in heart failure management were identified. Firstly, caregivers identified needs about supporting management of heart failure including: coping with the variability of heart failure symptoms, what to do in an emergency, understanding and managing medicines, providing emotional support, promoting exercise and physical activity, providing personal care, living with a cardiac device and supporting depression management. Secondly, as they make the transition to becoming a caregiver, they need to develop skills to undertake difficult discussions about the role; communicate with health professionals; manage their own mental health, well-being and sleep; and manage home and work. Thirdly, caregivers require skills to engage social support, and voluntary and formal services while recognising that the long-term future is uncertain. Discussion The identification of the needs of caregiver has been used to inform the development of a home-based heart failure intervention facilitated by a trained health care practitioner.
The crystal structure of kiddcreekite solved using micro X-ray diffraction and the EPCryst program
Authors: Wenyuan Liu , Cheng Dong , Xiangping Gu , Yu Liu , Xiaoping Qiu , Yuchuan Chen 
Published: March 2015

AbstractAbundant kiddcreekite grains were identified in the Zijinshan Cu-Au epithermal deposit in Fujian Province, China. The mineral occurs as polycrystalline grains, 5–300 μm in size, associated with colusite, enargite, stannoidite, mawsonite, vinciennite, hemusite, tennantite and wolframite in a predominantly covellite ore. Based on electron microprobe analysis, the empirical formula of the kiddcreekite is Cu6.2Sn0.97W0.95S7.83, without significant Se or Te contents. The crystal structure of kiddcreekite was solved using the direct-space method (EPCryst) from laboratory micro X-ray diffraction (μXRD) data and refined by the Rietveld method. The R values of the final Rietveld refinement were Rp = 9.06%, Rwp = 8.31%, RB = 3.16 and RF = 2.17%. Kiddcreekite has a cubic structure, space group F3m and lattice parameter a = 10.8178(3) Å (Z = 4, V = 1265.95(6) Å3). In the unit cell, W, Sn and Cu atoms occupy the 4a, 4c and 24f Wyckoff positions, respectively, and S atoms occupy two sets of 16e Wyckoff positions. The structure of kiddcreekite consists of stacked double MeS4 layers (giving a W–Sn–Cu tier and a Cu–vacancy tier) as in the sphalerite substructure. This study also demonstrates the possibility of using laboratory µXRD data coupled with the direct-space method to solve inorganic structures in cases where samples are too small for conventional powder and single-crystal diffraction.
The crystal structure of camerolaite and structural variation in the cyanotrichite family of merotypes
Authors: Mills S. J. , Christy A. G. , Schnyder C. , Favreau G. , Price J. R. 
Published: March 2015

AbstractWe present Raman data for camerolaite, cyanotrichite and carbonatecyanotrichite, and using synchrotron single-crystal X-ray diffraction have solved the structure of camerolaite from the Tistoulet Mine, Padern, Aude Department, France. Camerolaite crystallizes in space groupP1 with the unit-cell parameters:a= 6.3310(13) Å,b= 2.9130(6) Å,c= 10.727(2) Å, α = 93.77(3)°, β = 96.34(3)°, γ =79.03(3)º,V= 192.82(7) Å3andZ= ⅓, with respect to the ideal formula from the refinement, Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4). The crystal structure was solved toR1= 0.0890 for all 1875 observed reflections [Fo> 4σFo] and 0.0946 for all 2019 unique reflections. ThePcell has been transformed into aC-centred cell that aids comparison with that of the structurally related khaidarkanite byaC= 2aP–bP, giving parametersa= 12.441(3),b= 2.9130(6),c= 10.727(2) Å, α = 93.77(3), β = 95.57(3), γ = 92.32(3)º andZ= ⅔ in C1. Edge-sharing octahedral ribbons Cu2Al(O,OH,H2O)8form hydrogen-bonded layers || (001), as in khaidarkanite. The partially occupied interlayer Sb and S sites of the average structure are in octahedral and tetrahedral coordination by oxygen, respectively. They cannot be occupied simultaneously, which leads to regular alternation of [Sb(OH)6]–and SO42–groups in rods ||y, resulting in local tripling of the periodicity alongyfor the Sb(OH)6–SO4rods. Thus, camerolaite has a ‘host–guest’ structure in which an invariant host module (layers of Cu–Al ribbons) has embedded rod-like guest modules with a longer periodicity. Coupling between the phases of these rods is only short-range, resulting in diffuse X-ray scattering rather than sharp superstructure reflections. Similar disorder is known for parnauite, and is deduced for other members of the cyanotrichite group (cyanotrichite, carbonatecyanotrichite and khaidarkanite). Group members all share the Cu–Al ribbon module but have interlayer rods of different compositions and topologies; thus, they form a merotypic family. The low symmetry of the camerolaite average structure suggests other possibilities for structure variation in the group, which are discussed.
The Piteiras emerald mine, Minas Gerais, Brazil: fluid-inclusion and gemmological perspectives
Authors: Lynch E. P. , Costanzo A. , Feely M. , Blamey N. J. F. , Pironon J. , Lavin P. 
Published: March 2015

AbstractNew fluid inclusion analyses using a range of analytical techniques including quadropole mass spectrometric analyses coupled with gemmological investigations were conducted on rough and gemquality faceted emeralds from the Piteiras Mine, Minas Gerais, Brazil. These data complement those of Rondeau et al. (2003) who also presented analyses of the Piteiras emeralds. Emeralds are found typically as euhedral-to-anhedral crystals disseminated in biotite-phlogopite schist and range from 0.5 to 50 mm long. Emerald mineralization is associated closely with alkaline metasomatized pegmatite bodies, quartz boudin and veins, and talc-chlorite bands. Four types of fluid inclusions are recognized in the emeralds. These include aqueous brine and aqueous carbonic varieties containing one or two liquid phases, along with gas bubbles and/or solid crystals (e.g. carbonates). Primary fluid inclusions in emeralds record salinities of ~4–24 eq. wt.% NaCl and minimum trapping temperatures from ~350 to 480ºC. Combined microthermometry, Raman spectroscopy and crush-leach gas analyses indicate that the mineralizing fluid was an aqueous carbonic brine enriched in reduced volatile species such as CH4, N2, H2S and alkanes. With respect to their optical properties (RI ε = 1.573–1.580; RI ω = 1.580–1.588; birefringence = 0.006–0.008) and specific gravity (2.65–2.78), the Piteiras emeralds fall within the expected range for metasomatic, schist-hosted emeralds.
Synthetic norsethite, BaMg(CO3)2: revised crystal structure, thermal behaviour and displacive phase transition
Authors: Effenberger H. , Pippinger T. , Libowitzky E. , Lengauer C. L. , Miletich R. 
Published: March 2015

AbstractThe crystal structure of synthetic BaMg(CO3)2whose mineral name is norsethite was re-investigated by single-crystal X-ray diffraction. Complementaryin situhigh- and low-temperature studies by means of vibrational spectroscopy (Raman, IR), powder X-ray diffraction techniques and thermal analyses were performed. Diffraction images (298 K) revealed weak superstructure reflections caused by the displacement of the O atoms in the earlier consideredRmstructure model (a = 5.0212(9), cnew= 2 cold= 33.581(6) Å ,Rc, Z = 6, R1 = 0.011, sinθ/λ < 0.99 Å–1). Thermal analyses reveal decarbonatization in two decomposition steps above 750 K, and the heat-flow curves (difference scanning calorimetry) give clear evidence of a weak and reversible endothermal change at 343±1 K. This agrees with a discontinuity in the IR and single-crystal Raman spectra. The changing trend of thec/aratio supports this discontinuity indicating a temperature-induced structural transition in the range between 343 and 373 K. As the change of the unit-cell volume is almost linear, the character of the transition is apparently second order and matches the mechanism of a subtle displacement of the oxygen atom position. The apparent instability of theRcstructure is also evidenced by the remarkably larger anisotropic displacement of the oxygen atom.
High-pressure synthesis and application of a 13C diamond pressure sensor for experiments in a hydrothermal diamond anvil cell
Authors: Chertkova Nadezda , Yamashita Shigeru , Ito Eiji , Shimojuku Akira 
Published: March 2015

AbstractPolycrystalline, cubic 13C diamond was synthesized from amorphous carbon in the Kawai-type multianvil apparatus at 21 GPa and at a temperature greater than 2350ºC. The polycrystalline diamond was homogeneous with a small grain size (10–20 μm) and a sharp Raman peak, and thereby was suitable as a pressure sensor for the experiments in a hydrothermal diamond anvil cell. Pressure- and temperature-dependence of the Raman shift of the synthesized 13C diamond was investigated in situ at simultaneous high pressures and high temperatures in the hydrothermal diamond anvil cell, using the ruby fluorescence line, quartz Raman shift and H2O phase transitions as pressure references. It was observed that the frequency shift with pressure is independent of temperature and vice versa up to 500ºC and 4.2 GPa. The present study indicates that the 13C diamond Raman shift can be used for pressure determination with an accuracy better than ±0.3 GPa under the conditions examined.