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Košice, Slovakia

Fornalczyk A.,Silesian University of Technology | Kraszewski M.,Silesian University of Technology | Willner J.,Silesian University of Technology | Kadukova J.,University of Kosice | And 3 more authors.
Archives of Metallurgy and Materials

Metal supported auto catalysts, have been used in sports and racing cars initially, but nowadays their application systematically increases. in Metal Substrate (supported) Converters (MSC), catalytic functions are performed by the Platinum Group Metals (PGM): Pt, Pd, Rh, similarly to the catalysts on ceramic carriers. The contents of these metals make that spent catalytic converters are valuable source of precious metals. All over the world there are many methods for the metals recovery from the ceramic carriers, however, the issue of platinum recovery from metal supported catalysts has not been studied sufficiently yet. The paper presents preliminary results of dissolution of spent automotive catalyst on a metal carrier by means of acids: H2SO4, HCl, HNO3, H3PO4. The main assumption of the research was the dissolution of base metals (Fe, Cr, Al) from metallic carrier of catalyst, avoiding dissolution of PGMs. Dissolution was the most effective when concentrated hydrochloric acid, and 2M sulfuric acid (VI) was used. It was observed that the dust, remaining after leaching, contained platinum in the level of 0.8% and 0.7%, respectively. Source

Czerny M.,University Hospital Berne | Eggebrecht H.,Cardioangiological Center Bethanien | Sodeck G.,Medical University of Vienna | Weigang E.,University Medical Center Mainz | And 24 more authors.
European Journal of Cardio-thoracic Surgery

Objectives: To review the incidence, clinical presentation, definite management and 1-year outcome in patients with aorto-oesophageal fistulation (AOF) following thoracic endovascular aortic repair (TEVAR). Methods: International multicentre registry (European Registry of Endovascular Aortic Repair Complications) between 2001 and 2011 with a total caseload of 2387 TEVAR procedures (17 centres). Results: Thirty-six patients with a median age of 69 years (IQR 56-75), 25% females and 9 patients (19%) following previous aortic surgery were identified. The incidence of AOF in the entire cohort after TEVAR in the study period was 1.5%. The primary underlying aortic pathology for TEVAR was atherosclerotic aneurysm formation in 53% of patients and the median time to development of AOF was 90 days (IQR 30-150). Leading clinical symptoms were fever of unknown origin in 29 (81%), haematemesis in 19 (53%) and shock in 8 (22%) patients. Diagnosis could be confirmed via computed tomography in 92% of the cases with the leading sign of a new mediastinal mass in 28 (78%) patients. A conservative approach resulted in a 100% 1-year mortality, and 1-year survival for an oesophageal stenting-only approach was 17%. Survival after isolated oesophagectomy was 43%. The highest 1-year survival rate (46%) could be achieved via an aggressive treatment including radical oesophagectomy and aortic replacement [relative risk increase 1.73 95% confidence interval (CI) 1.03-2.92]. The survival advantage of this aggressive treatment modality could be confirmed in bootstrap analysis (95% CI 1.11-3.33). Conclusions: The development of AOF is a rare but lethal complication after TEVAR, being associated with the need for emergency TEVAR as well as mediastinal haematoma formation. The only durable and successful approach to cure the disease is radical oesophagectomy and extensive aortic reconstruction. These findings may serve as a decision-making tool for physicians treating these complex patients. © The Author 2013. Published by Oxford University Press on behalf of the European Association for Cardio-Thoracic Surgery. All rights reserved. Source

Czerny M.,University Hospital Berne | Eggebrecht H.,West German Heart Center Essen | Sodeck G.,University Hospital Berne | Verzini F.,Vascular and Endovascular Surgery Unit | And 21 more authors.
Journal of Endovascular Therapy

Purpose: To test the hypothesis that simultaneous closure of at least 2 independent vascular territories supplying the spinal cord and/or prolonged hypotension may be associated with symptomatic spinal cord ischemia (SCI) after thoracic endovascular aortic repair (TEVAR). Methods: A pattern matching algorithm was used to develop a risk model for symptomatic SCI using a prospective 63-patient single-center cohort to test the positive predictive value (PPV) of prolonged intraoperative hypotension and/or simultaneous closure of at least 2 of 4 the vascular territories supplying the spinal cord (left subclavian, intercostal, lumbar, and hypogastric arteries). This risk model was then applied to data extracted from the multicenter European Registry on Endovascular Aortic Repair Complications (EuREC). Between 2002 and 2010, the 19 centers participating in EuREC reported 38 (1.7%) cases of symptomatic spinal cord ischemia among the 2235 patients in the database. Results: In the single-center cohort, direct correlations were seen between the occurrence of symptomatic SCI and both prolonged intraoperative hypotension (PPV 1.00, 95%CI 0.22 to 1.00, p=0.04) and simultaneous closure of at least 2 independent spinal cord vascular territories (PPV 0.67, 95% CI 0.24 to 0.91, p=0.005). Previous closure of a single vascular territory was not associated with an increased risk of symptomatic spinal cord ischemia (PPV 0.07, 95% CI 0.01 to 0.16, p=0.56). The combination of prolonged hypotension and simultaneous closure of at least 2 territories exhibited the strongest association (PPV 0.75, 95%CI 0.38 to 0.75, p<0.0001). Applying themodel to the entire EuREC cohort found an almost perfect agreement between the predicted and observed risk factors (kappa 0.77, 95% CI 0.65 to 0.90). Conclusion: Extensive coverage of intercostal arteries alone by a thoracic stent-graft is not associated with symptomatic SCI; however, simultaneous closure of at least 2 vascular territories supplying the spinal cord is highly relevant, especially in combination with prolonged intraoperative hypotension. As such, these results further emphasize the need to preserve the left subclavian artery during TEVAR. © 2012 by the International Society of Endovascular Specialists. Source

Muransky J.,University of Kosice | Hodolic J.,University of Novi Sad | Vukelic D.,University of Novi Sad
Journal of Environmental Protection and Ecology

This paper describes a system for environmental and economic analyses of products. System is developed for life cycle analysis of existing products and products in development. Paper also presents some examples of the EcoCAD system application in the automotive industry. Finally, analysis results are shown and adequate conclusions are given. Source

Tartagni M.V.,University of Kosice | Alrasheed H.,University of Kosice | Damiani G.R.,Hospital of Sondrio | Montagnani M.,University of Bari | And 4 more authors.
Journal of Pediatric and Adolescent Gynecology

Study Objective: Hirsutism has negative impact on adolescent psychosocial development for both cosmetic and endocrine reasons. This study evaluated the effectiveness of a new intermittent, low-dose finasteride regimen consisting of 2.5mg of drug given every 3days (1day of treatment, 2days of drug withdrawal) for 6months in girls with hirsutism by polycystic ovarian syndrome (PCOS) or idiopathic hirsutism (IH). Design and Participants: Twenty-eight girls (15-19y old) with hirsutism were randomly assigned to 2 treatment groups and treated for 6months. Fourteen patients (7 with IH, 7 with PCOS) received finasteride; fourteen patients (7 with IH, 7 with PCOS) received placebo. Hirsutism score (HS), clinical, and hormonal effects were compared between the 2 groups. Results: In patients treated with finasteride, the HS value at 6months was 52.9% lower than that observed at baseline in girls with IH, and 52.8% lower in girls with PCOS (P<.0001 for both). Similarly, the 3α-17 β-androstenediol glucuronide serum levels were decreased by 34.8% in patients with IH, and by 47.5% in patients with PCOS (P<.0001, respectively). Finasteride treatment was well tolerated and did not alter values of BMI, serum levels of sexual hormones, metabolic parameters related to liver and kidney function as well as glycemic and lipidic asset. Conclusions: A low-dose of finasteride, given every 3days, reduces the HS in young patients affected by PCOS or IH. Compared with conventional continuous finasteride administration, the intermittent low-dose regimen has similar efficacy with the advantage to be safer and less expensive. © 2014 North American Society for Pediatric and Adolescent Gynecology. Source

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