Nephrostomy tube misplacement in the inferior vena cava following percutaneous nephrostomy

Percutaneous renal interventions are characterized by bleeding and infectious complications, as well as trauma to organs located near the kidney, renal or inferior vena cava (IVC). The article presents a clinical observation of a rare complication of percutaneous nephrostomy (PCN), i.e. migration of the distal end of the nephrostomy tube into the IVC. Its timely removal followed by re-nephrostomy made it possible to avoid bleeding and restore drainage of the pyelocalyceal system. Along with this, the article presents a literature review on this condition in the eLibrary, Springer, MedLine, Embase, UpToDate databases from 2000 to 2021. The indications for PCN, the frequency and risk factors of IVC damage during percutaneous renal interventions, as well as treatment tactics were studied. After the initial evaluation of the literature, ten articles were selected for further analysis. The main risk factors associated with IVC perforation after PCN include the surgeon's lack of experience in instrumental imaging, misjudgment of the length of the nephrostomy tube, and its insertion depth, resulting in its inadequate placement. Removal of the nephrostomy tube from the IVC under radiological and ultrasound guidance or open surgery are the main methods to correct for this complication

Смешанные M-V-Sb-оксиды как катализаторы оксидегидрогенизаци

The properties of mixed M-V-Sb (M = Ni, Co, Bi, Sn) oxides, supported on aluminum oxide, have been physically characterized and their activities estimated .in dehydrogenation of light paraffins, ethyl benzene and ethanol. The most selective NiVSb catalyst was easily reduced which allowed for proposing of the reduction-oxidation mechanism .The result of kinetic researches has shown that, the concentration of oxygen in the gas phase is the key parameter responsible for dehydrogenation selectivity. To maintain the optimal process conditions, oxygen was distributed along the catalyst layers.Смешанные M-V-Sb-оксиды ( M = Ni, Co, Bi, Sn), нанесенные на оксид алюминия, были физически охарактеризованы в свойствах и оценены по активности в реакции дегидрирования легких пара-финов, этилбензола и этанола. Наиболее селективный катализатор Ni-V-Sb легко восстанавли-вался, что позволило выдвинуть предположение об окислительно-восстановительном механизме реакции. Результаты кинетических исследований показали, что концентрация кислорода газовой фазы является ключевым параметром, ответственным за дегидрирующую селективность. Для под-держания указанного оптимума использовалась распределенная подача кислорода по слою катализатора

Окислительное дегидрирование изобутана в изобутен на Ni-V-Sb-алюмооксидном катализаторе.

Addition of nickel oxide in the V-Sb/γAl2O3 catalytic system, used in oxidative dehydrogenation of isobutane, significantly increases conversion (from 36 to 42-44%) at isobutene selectivity of 70 %. The developed catalysts consisting of systems V-Sb-O and V-Sb-Ni-O were characterized using XRD, XPS, and H2-TPR. Formation of the discovered nickel vanadate phase NiV2O6 is as a result of free phase VOx is a more effective catalyst due to increase in the quantity of mobile oxygen lattice. It is suggested that the set of various vanadium surface phases improves activity and selectivity of the new catalytic systems.Включение дополнительно оксида никеля в каталитическую систему V-Sb/γAl2O3, используемую в окислительном дегидрировании изобутана, значительно увеличивает конверсию (от 36 до 42-44%) при селективности по изобутену 70%. Разработанные катализаторы, включающие системы V-Sb-O и V-Sb-Ni-O, были охарактеризованы методами БЭТ, XRD, XPS и H2-TPR. Формирование обнаруженной фазы ванадата никеля NiV2O6 приводит за счет свободной фазы VOx к более эффективному катализатору вследствие увеличения количества мобильного кислорода решетки. Предполагается, что набор разновидностей поверхностных фаз ванадия улучшает активность и селективность новой каталитической системы

Mixed M-V-Sb oxides as oxodehydrogenization catalysts

The properties of mixed M-V-Sb (M = Ni, Co, Bi, Sn) oxides, supported on aluminum oxide, have been physically characterized and their activities estimated .in dehydrogenation of light paraffins, ethyl benzene and ethanol. The most selective NiVSb catalyst was easily reduced which allowed for proposing of the reduction-oxidation mechanism .The result of kinetic researches has shown that, the concentration of oxygen in the gas phase is the key parameter responsible for dehydrogenation selectivity. To maintain the optimal process conditions, oxygen was distributed along the catalyst layers

Isobutane dehydrogenation by oxidizing in isobutene on Ni-V-Sb/γAl₂O₃ catalytic system

Addition of nickel oxide in the V-Sb/γAl2O3 catalytic system, used in oxidative dehydrogenation of isobutane, significantly increases conversion (from 36 to 42-44%) at isobutene selectivity of 70 %. The developed catalysts consisting of systems V-Sb-O and V-Sb-Ni-O were characterized using XRD, XPS, and H2-TPR. Formation of the discovered nickel vanadate phase NiV2O6 is as a result of free phase VOx is a more effective catalyst due to increase in the quantity of mobile oxygen lattice. It is suggested that the set of various vanadium surface phases improves activity and selectivity of the new catalytic systems