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Pericardial Strip versus Ring Annuloplasty for Repair of Functional Tricuspid Regurgitation

World Journal of Cardiovascular Surgery 2014年第12期4卷 239-244页

作者： Husain Hamza Jabbad Ahmed Abdelrahman Elassal osama saber eldib Cardiothoracic Surgery Department (KAUH) Zagazig University Zagazig Egypt

Background: Functional tricuspid regurgitation is a challenge regarding indications for repair and proper surgical technique. Aim of the study: We reviewed our midterm results of tricuspid valve repair for functional regurgitation comparing pericardial strip versus ring annuloplasties. Patients and methods: From January 2008 to December 2013, we operated 59 patients (male:female, 41:18, with a mean age of 34 ± 14 years) for functional tricuspid regurgitation. Tricuspid annuloplasty was done using pericardial strip in 39 patients and ring in 20 patients. Concomitant procedures were mitral valve replacement in 66% of patients, aortic valve replacement in 5% and double valve replacement in 29%. Clinical and echocardiographic data were collected. Results: Preoperative characteristics of the two groups were similar regarding age, percentage of female patients, New York Heart Association functional class and pulmonary artery pressure. More patients with preoperative right ventricular dysfunction were found in pericardial annuloplasty group although this was not statistically significant (13 versus 5;P = 0.52). Operative times were similar in both groups. We had one mortality case (1.69%) due to low cardiac output in the pericardial group. Postoperative complications included reexploration for bleeding in one patient and chronic heart failure in another patient. The average follow up period was 3 years and it was complete in 100% of patients. Postoperative freedom from recurrent moderate tricuspid regurgitation was 90% in both groups. Conclusion: Pericardial strip annuloplasty is a simple, inexpensive, reproducible and efficient technique that has comparable results to ring annuloplasty.

关键词： Pericardial Strip Annuloplasty Tricuspid Ring Annuloplasty Functional Tricuspid Regurgitation

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Novel self assembly behavior for γ-alumina nanoparticles

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Particuology 2012年第6期10卷 744-750页

作者： osama saber Physics Dept Faculty of ScienceKing Faisal UniversityAl-Hassa 31982P.O.Box 400Saudi Arabia Egyptian Petroleum Research Institute Nasr CityP.O.Box 11727CairoEgypt

In this study, self assembly behavior was induced for γ-alumina nanoparticles by adsorption of dimethyl disulfide. Following this trend, we have developed a chemical process to obtain ＇y-alumina in the nano scale. Scanning electron microscopy images of the prepared γ-alumina showed big and strong agglomeration of the nanoparticles indicating that these nanoparticles have strong surface forces. Transmission electron microscopy images confirmed that the γ-alumina nanoparticles 3-7 nm in size were converted to uniform spherical shape in the size range of 1-2 mm after shaking with dimethyl disulfide in the presence of n-hexane at room temperature. This phenomenon did not appear in the case of alumina in the micro scale. The surface properties of the prepared γ-alumina in the nano scale were characterized and compared with the γ-alumina in the micro scale by using low temperature nitrogen adsorption-desorption system, indicating that the specific surface area of the prepared γ-alumina nanoparticles is larger than that of the γ-alumina in the micro scale. Furthermore, micro- and meso-pores were observed for the if-alumina nanoparticles while only mesoporous structure was detected for the γ-alumina in the micro scale. These experimental results suggested that the self assembly behavior of the γ-alumina nanoparticles may be due to the selective adsorption ofdimethyl disulfide in the micropores of these nanoparticles to act as bridge linking the nanoparticles.

关键词： γ-Alumina nanoparticlesNovel self assembly behaviorScanning and transmission electronmicroscopy

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Fast Degradation of Green Pollutants Through Nanonets and Nanofibers of the Al-Doped Zinc Oxide

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Acta Metallurgica Sinica(English Letters) 2018年第5期31卷 533-546页

作者： osama saber Haifa Alomair Mohamed Abu-Abdeen Abdullah Aljaafari Faculty of Science King Faisal University Al-Hasa 31982P.O. Box 400 Saudi Arabia Egyptian Petroleum Research Institute P.O Box 11727 Nasr City Cairo Egypt Ministry of Education Al-Hasa 31982 Saudi Arabia

In this study, series of nanolayered structures of Zn–Al LDHs were prepared by urea hydrolysis. Nanofibers and nanonets of the Al-doped ZnO were formed via the decomposition of the nanolayers under high pressure and temperature. Nanospheres were also prepared for comparison. The different morphologies of the prepared nanomaterials were confirmed by several techniques. An improvement for the optical properties of the doped zinc oxides was observed through narrowing of their band gap energies because of transforming the nanolayers to nanonets and nanofibers. The photocatalytic activities of the prepared nanomaterials were studied through photocatalytic degradation of the pollutants of acid green dyes. Complete decolorization and mineralization of green dyes happened in the presence of the nanolayers and nanospheres within 4–6 h,while the nanonets and the nanofibers achieved the complete decolorization and degradation of the dyes at shorter time 1.3 h. These results could be explained though the kinetic study of the photocatalytic degradation of dyes. It was concluded that the nanonets and the nanofibers were very effective for the photocatalytic degradation of pollutants.

关键词： Al-doped ZnO nanolayers Nanofibers Nanonets Band gap energy Photocatalytic degradation Acid green dyes pollutants

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Intercostal Muscle Flap in Post Tuberculous Pneumonectomy: A New Technique

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Surgical Science 2012年第5期3卷 249-252页

作者： Alaa Brik Abdel-Maged Salem osama saber Department of Cardiothoracic surgery Zagazig University Hospital Zagazig Egypt

Objective: There are many risk factors for postoperative bronchopleural fistula (BPF), including extensive resection, diabetes, chronic infection, perioperative steroid therapy, preoperative chemotherapy, and radiotherapy, the risk of bronchopleural fistula increases with resection for inflammatory diseases, especially Mycobacterium tuberculosis (MTB). The aim of this study is to evaluate the efficacy and safety of using double pedicled intercostal muscle flaps with dual blood supply to buttress the bronchial stump after pneumonectomy for tuberculous lesions as a prophylactic new technique from post-pneumonectomy BPF. Methods: Between 2007 and 2011, 47 patients with pneumonectomy for post tuberculous lesions in the department of cardiothoracic surgery, Zagazig University Hospital were divided into two groups. Group A: 28 patients with single pedicled intercostal muscle flap used and applied on the bronchial stump after pneumonectomy. Group B: 19 patients with double pedicled intercostal muscle flaps used and applied on the bronchial stump. The mean age of the patients was 42.9 years (range 27 - 67 years) in Group A, 44.8 years (range 36 - 71 years) in Group B. Results: Bleeding in one patient in Group A (3.5%) and two patients in Group B (10.5%);empyema in two patients (7.1%) in Group A only one of them developed bronchopleural fistula;arrhythmias in one patients (3.5%) in Group A and one patient in Group B (5.2%);chylothorax in one patients (3.5%);Chronic chest pain in one patient in Group A (3.5%) and two patients in Group B (10.5%). The mean follow up period was 32.7 ± 12.9 months (range between 3 and 48 months). All patients remained symptom free with no evidence of late bronchopleural fistula in Group B. Conclusions: Double pedicled intercostal muscle flaps with dual blood supply buttressing the bronchial stump is new prophylactic technique from BPF after pneumonectomy for pulmonary tuberculous lesions in high risk patients.

关键词： Intercostal Muscles Pneumonectomy Tuberculosis

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