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5. Revisional Surgery After One Anastomosis/Minigastric Bypass: an Italian Multi-institutional Survey

Author

Musella M., Vitiello A., Susa A., Greco F., De Luca M., Manno E., Olmi S., Raffaelli M., Lucchese M., Carandina S., Foletto M., Pizza F., Bardi U., Navarra G., Schettino A. M., Gentileschi P., Sarro G., Chiappetta S., Tirone A., Berardi G., Velotti N., Foschi D., Zappa M., Piazza L., Bagaglini G., Benavoli D., Belluzzi A., Callari C., Giusti M., Facchiano E., Licari L., Iovino G., Piatto G., Stanzione F., Uccelli M., Veroux G., Voglino C., Musella, M., Vitiello, A., Susa, A., Greco, F., De Luca, M., Manno, E., Olmi, S., Raffaelli, M., Lucchese, M., Carandina, S., Foletto, M., Pizza, F., Bardi, U., Navarra, G., Schettino, A. M., Gentileschi, P., Sarro, G., Chiappetta, S., Tirone, A., Berardi, G., Velotti, N., Foschi, D., Zappa, M., Piazza, L., Bagaglini, G., Benavoli, D., Belluzzi, A., Callari, C., Giusti, M., Facchiano, E., Licari, L., Iovino, G., Piatto, G., Stanzione, F., Uccelli, M., Veroux, G., Voglino, C., Musella, Mario, Vitiello, Antonio, Susa, Antonio, Greco, Francesco, De Luca, Maurizio, Manno, Emilio, Olmi, Stefano, Raffaelli, Marco, Lucchese, Marcello, Carandina, Sergio, Foletto, Mirto, Pizza, Francesco, Bardi, Ugo, Navarra, Giuseppe, Schettino, Angelo Michele, Gentileschi, Paolo, Sarro, Giuliano, Chiappetta, Sonja, Tirone, Andrea, Berardi, Giovanna, Velotti, Nunzio, Foschi, Diego, Zappa, Marco, and Piazza, Luigi

Subjects
Gastric Fistula, Reoperation, One anastomosis gastric bypass, Nutrition and Dietetics, Complications, Endocrinology, Diabetes and Metabolism, Mini gastric bypa, Original Contributions, Revisional surgery, Gastric Bypass, Mini gastric bypass, OAGB/MGB, Obesity, Morbid, One anastomosis gastric bypa, Surveys and Questionnaires, Weight Loss, Humans, Surgery, Complication, Retrospective Studies
Abstract

Background Efficacy and safety of OAGB/MGB (one anastomosis/mini gastric bypass) have been well documented both as primary and as revisional procedures. However, even after OAGB/MGB, revisional surgery is unavoidable in patients with surgical complications or insufficient weight loss. Methods A questionnaire asking for the total number and demographics of primary and revisional OAGB/MGBs performed between January 2006 and July 2020 was e-mailed to all S.I.C. OB centres of excellence (annual caseload > 100; 5-year follow-up > 50%). Each bariatric centre was asked to provide gender, age, preoperative body mass index (BMI) and obesity-related comorbidities, previous history of abdominal or bariatric surgery, indication for surgical revision of OAGB/MGB, type of revisional procedure, pre- and post-revisional BMI, peri- and post-operative complications, last follow-up (FU). Results Twenty-three bariatric centres (54.8%) responded to our survey reporting a total number of 8676 primary OAGB/MGBS and a follow-up of 62.42 ± 52.22 months. A total of 181 (2.08%) patients underwent revisional surgery: 82 (0.94%) were suffering from intractable DGER (duodeno-gastric-esophageal reflux), 42 (0.48%) were reoperated for weight regain, 16 (0.18%) had excessive weight loss and malnutrition, 12 (0.13%) had a marginal ulcer perforation, 10 (0.11%) had a gastro-gastric fistula, 20 (0.23%) had other causes of revision. Roux-en-Y gastric bypass (RYGB) was the most performed revisional procedure (109; 54%), followed by bilio-pancreatic limb elongation (19; 9.4%) and normal anatomy restoration (19; 9.4%). Conclusions Our findings demonstrate that there is acceptable revisional rate after OAGB/MGB and conversion to RYGB represents the most frequent choice. Graphical abstract

Published
2022

9. Light Absorption Coefficient and Hydrogen Content as Key Properties for Inferring Structural Features of Soot.

Author

Russo, C., Stanzione, F., Tregrossi, A., and Ciajolo, A.

Subjects
LIGHT absorption, HYDROGEN as fuel, ULTRAVIOLET radiation, FOURIER transform infrared spectroscopy, ETHYLENE, OPTICAL spectroscopy
Abstract

The relationship between the light absorption coefficient of flame-formed soot and its hydrogen content was investigated by coupling UV-Visible spectroscopy with elemental analysis and FT-IR quantification of hydrogen tethered to soot sampled along the axis of a premixed ethylene flame. Just after soot inception, the preferential depletion of aliphatic hydrogen was observed moving from 0.2 to 0.1 hydrogen mole fraction and in correspondence of a relatively slight increase of the absorption coefficient. Soot formation rate decreased just after the disappearance of aliphatic hydrogen due to the consequent decrease of active sites on soot particles necessary for further carbon addition and growth. Crossing the threshold hydrogen mole fraction value of about 0.1, aromatic hydrogen resulted to survive to dehydrogenation producing a highly light-absorbing carbon. Thus, the high absorption coefficient appeared to be due to coagulation and thermal annealing marking the end of the soot formation process. [ABSTRACT FROM PUBLISHER]

Published
2014
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10. Spectral Analysis in the UV-Visible Range for Revealing the Molecular Form of Combustion-Generated Carbonaceous Species.

Author

Russo, C., Stanzione, F., Alfè, M., Ciajolo, A., and Tregrossi, A.

Subjects
SPECTRUM analysis, ULTRAVIOLET spectroscopy, OPTICAL spectroscopy, COMBUSTION, OPTICAL properties, CARBON, DECONVOLUTION (Mathematics), GEL permeation chromatography
Abstract

A method of UV-visible spectra analysis was developed for investigating the relationship between the optical properties and the complex composition/structure of carbonaceous species formed in a sooting premixed ethylene flame. The UV-visible spectra were measured on carbonaceous species, caught on quartz plates inserted along the flame and recovered by solvent treatment. The contribution and the structure of components in a very wide molecular weight range, from 200 to 1E11 u, were evaluated by size exclusion chromatography coupled with on-line UV-visible spectroscopy of the dichloromethane-soluble and dry soot fractions. The optical band gap and the UV peak position of each MW-segregated fraction were evaluated by means of a spectral deconvolution procedure, to get details on the carbon network structure in terms of sp2 and sp3 sites and size and stacking of the aromatic units. The species included in the 1E8-1E11 u range underwent graphitization/growth reactions during the formation process of carbonaceous species. Large polycyclic aroamtic hydrocarbon (PAH) molecules and clusters of PAH, included in the 200-1E8 u range, did not exhibit molecular growth and internal structure transformation, suggesting that they merely aggregate/coagulate participating to the formation of carbon particles. [ABSTRACT FROM AUTHOR]

Published
2012
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