bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterizing Riesz bases via biorthogonal Bessel sequences
Authors: Zikkos E. 
Published: September 2023

Recently D.T. Stoeva proved that if two Bessel sequences in a separable Hilbert space $\mathcal H$ are biorthogonal and one of them is complete in $\mathcal H$, then both sequences are Riesz bases for $\mathcal H$. This improves a well known result where completeness is assumed on both sequences.
In this note we present an alternative proof of Stoeva's result which is quite short and elementary, based on the notion of Riesz-Fischer sequences.
On the Dirichlet problem for A-harmonic functions
Authors: Gutlyanskiĭ V.Ya. , Ryazanov V.I. , Sevost’yanov E.A. , Yakubov E. 
Published: September 2023

We study the Dirichlet boundary value problem with continuous boundary data for the A-harmonic equations div[A grad u] = 0 in an arbitrary bounded domain D of the complex plane £ with no boundary component degenerated to a single point. We provide integral criteria, including the BMO and FMO criteria expressed in terms of A (z), for the existence of weak solutions to the problem. We also discuss the connections between A-harmonic functions and potential theory.
Complex use of perfusion techniques in kidney transplantation from a donor with out-of-hospital cardiac arrest (clinical case)
Authors: Shabunin A. V. , Minina M. G. , Drozdov P. A. , Miloserdov I. A. , Saydulaev D. A. , Sevostyanov V. M. , Tenchurina E. A. 
Published: September 2023

Objective: to present the successful experience with a donor with out-of-hospital cardiac arrest (OHCA) in whom a set of modern perfusion techniques was used to obtain kidneys suitable for transplantation.Materials and methods. Automatic chest compression was resumed in an OHCA donor (after biological death has been confirmed in the hospital) to maintain minimal perfusion under mechanical ventilation with 100% FiO2. With femoral vein cannulation, an extracorporeal circuit with a centrifuge pump and oxygenator was connected and abdominal normothermic regional perfusion was initiated. After 215 minutes, kidney was explanted under normothermic machine perfusion. Next, the left kidney was placed in the LifePort Kidney Transporter for hypothermic machine perfusion of donor kidneys. Perfusion time was 285 minutes. The right kidney was transplanted without additional ex-vivo perfusion.Results. Due to the complex use of perfusion techniques both in the donor body and ex-vivo, donor kidneys, after OHCA, with a total warm ischemia time of 110 minutes, were transplanted to recipients with good results. In the postoperative period, there was delayed function of the left and right renal grafts. The patients were discharged in a satisfactory condition under outpatient follow-up.Conclusion. The possibility and efficiency of organ donation after OHCA, facilitated by modern perfusion techniques and devices, open up a new perspective in addressing the organ shortage crisis.
Surgical technique for explantation of a functioning cardiopulmonary complex in an experiment
Authors: Zhulkov M. O. , Zykov I. S. , Makaev A. G. , Protopopov A. V. , Murtazaliev M. N. , Kosimov F. Yu. , Tarkova A. R. , Limansky A. D. , Smirnov Ya. M. , Agaeva H. A. , Frykina O. E. , Sirota D. A. 
Published: September 2023

Objective: to develop and approve the surgical technique for explantation of a functioning cardiopulmonary complex under normothermic autoperfusion.Materials and methods. Landrace pigs were used as the experimental model for a series of acute experiments (n = 10). During the experiment, invasive pressure in the cavities of the heart and main arteries, blood gas composition, and myocardial contractility were monitored. The functioning cardiopulmonary complex was explanted through a median sternotomy. The explanted complex was conditioned at 37–38 °C for 6 hours.Results. In the course of a series of experiments, it was shown that stable operation of the isolated heart-lung complex ex vivo for 6 hours was fundamentally possible provided that the parameters of the basic homeostasis constants are maintained. The technological solutions used made it possible to ensure safe hemodynamic and anatomical isolation of the working cardiopulmonary complex.Conclusion. The developed protocol for isolating a functioning cardiopulmonary complex allows to provide stable graft function for 6 hours under normothermic autoperfusion. Implementation of this concept in the development of transport systems would significantly facilitate their design and eliminate the use of expensive components. This would contribute to widespread introduction into clinical practice.
Aortic valve replacement after previous TAVI
Authors: Titov D. A. , Sorkomov M. N. , Pursanova D. M. , Fedoseykina M. I. , Babenko S. I. , Muratov R. M. 
Published: September 2023

Endovascular surgery for aortic valve defects has proven itself well in elderly patients with severe comorbidities competing with the underlying disease. However, the risk of dysfunction resulting from structural degeneration of bioprosthetic heart valve and prosthetic valve endocarditis remains high. Repeated surgeries are associated with complications, but open surgery is the only method of treatment in this group of patients.Objective: to describe a series of reinterventions for prosthetic valve dysfunction occurring after TAVI.Material and methods. From 2015 to 2022, at the Department of Emergency Surgery for Acquired Heart Diseases (Head, Professor R.M. Muratov), Bakulev Research Center for Cardiovascular Surgery, 6 reoperations were performed in patients who had previously undergone transcatheter aortic valve implantation (TAVI). The average age of patients at the time of TAVI and at the time of reoperation was 70.6 years (62–83) and 74.3 years (70–84), respectively. The EuroSCORE II predicted risk of mortality at the time of reintervention was 42.2% (21.7–87.6). The mean time to reoperation was 42 months. Indications for reoperation were early active prosthetic endocarditis (4 cases) and structural valve degeneration (2 cases).Results. At the hospital stage, 1 patient died of acute heart failure; the operation was performed for vital indications in conditions of extreme initial severity. In three patients, the early postoperative period was uneventful. One patient required intra-aortic balloon counterpulsation (IABP) due to heart failure, and 1 patient was implanted with permanent pacemaker. The average time of hospitalization was 14 days. Patients with active prosthetic endocarditis received a 6-week course of antibiotic therapy. The function of the implanted valves was satisfactory.Conclusions. Aortic valve replacement after previous TAVI is an emergency operation and represents the only way to treat valve dysfunction. Under active prosthetic endocarditis, timely surgery can save this patient cohort.
Efficacy of extracorporeal shock wave lithotripsy for post-transplant kidney stones. Hope or Disappointment?
Authors: Popov S. V. , Huseynov R. G. , Miloserdov I. A. , Kisil Yu. V. , Saydulaev D. A. , Sadovnikov S. V. , Sivak K. V. , Bunenkov N. S. , Perepelitsa V. V. , Lelyavina T. A. 
Published: September 2023

Nephrolithiasis in a transplanted kidney is an important medical and social problem. The presence of renal calculi may not manifest clinically for a long time due to the peculiarities of the surgical intervention during organ transplantation. Development of chronic urinary tract infection and deterioration of the functional ability of the renal transplant in the presence of kidney stones can lead to graft death, which is an immediate threat to the patient’s life. Existing Russian guidelines on the treatment of urolithiasis currently lack a clear strategy for the management of kidney transplant recipients.Objective: to systematize literature data on analysis of the outcomes of extracorporeal shock wave lithotripsy (ESWL) and other methods in patients with post-transplant kidney stones.Results. Thirty-five publications on the research topic were selected. We summarized the information on various therapy options for patients with stones in transplanted kidney: endourological approach, ESWL, percutaneous nephrolithotripsy (PCNL), open surgical treatment (nephrostomy, pyelolithotomy). A modern foreign algorithm for the management of patients with post-transplant kidney stones depending on the severity of obstruction with sepsis and the size of the renal calculi is presented.Conclusion. 1. The presence of stones in a kidney graft is a clinical situation that requires surgical treatment. 2. In clinical practice, different methods of treatment can be used, such as open intervention, ESWL, PCNL, retrograde transurethral manipulations. 3. In most cases, patient management tactics depend on the clinical picture (presence/absence of obstruction) and the size of the calculi. 4. The use of ESWL, as the most frequently used method, testifies to its efficiency and low-traumatic effect.
Organ donation and transplantation in the Russian Federation in 2022. 15<sup>th</sup> Report from the Registry of the Russian Transplant Society
Authors: Gautier S. V. , Khomyakov S. M. 
Published: September 2023

Objective: to monitor the current trends and developments in organ donation and transplantation in the Russian Federation based on data from the year 2022.Materials and methods. Heads of organ transplant centers were surveyed through questionnaires. Data control was done using the information accounting system of the Russian Ministry of Health. We performed a comparative analysis of data obtained over years from various federal subjects of the Russian Federation and transplant centers.Results. Based on data retrieved from the National Registry in 2022, 46 kidney, 31 liver and 16 heart transplant programs were existing in the Russian Federation as of the year 2022. Organ donation activity in 2022 was 5.2 per million population (p.m.p.), with a 73.7% multi-organ procurement rate and an average of 2.8 organs procured from one effective donor. In 2022, 2,555 organ transplants were performed in the Russian Federation, which included 1,562 kidney, 659 liver and 310 heart transplants. Same year, the number of transplant surgeries performed in the Russian Federation increased by 10.0% compared to 2021. In Moscow, organ donation activity was 26.3 p.m.p. The city of Moscow and the Moscow Oblast alone had a total of 12 transplant centers, accounting for 52.6% of all kidney transplants and 64.8% of all extrarenal transplants in the country. The number of organ recipients in the Russian Federation exceeds 150 p.m.p.Conclusion. The geographic distribution of transplant centers in the Russian Federation continues to expand. Five new centers were opened in 2022. Over the past year, the number of effective donors and organ transplants increased in the country. The resource potential of medical institutions has not been exhausted and this is set to further increase the number of organ transplants performed. Moscow is the powerhouse of Russian transplantology. However, other regional leaders have since appeared in the Russian Federation, such as in Kemerovo, Kazan, Rostov-on-Don, Tyumen, Irkutsk, and Volzhsky. In the Russian Federation, priority is being given to pediatric transplant care. It is expedient to implement a complex of measures aimed at identifying potential recipients.
Technique for reducing the surgical porosity of small-diameter vascular grafts
Authors: Nemets E. A. , Khairullina A. I. , Belov V. Yu. , Surguchenko V. A. , Vasilets V. N. , Sevastianov V. I. , Volkova E. A. , Basok Yu. B. 
Published: September 2023

High surgical porosity (SP) is one of the causes of significant blood loss, as well as hematoma formation. So, reducing the SP of small-diameter vascular grafts (VGs) is a crucial task.The objectiveof this work was to develop a technology for the formation of polycaprolactone (PCL)-based small-diameter VGs with a bioactive coating with reduced SP.Materials and methods. Porous VGs with an inner diameter of 3 mm were fabricated by electrospinning from 5% PCL solution with addition of 5–30% gelatin (PCL/G) on an NANON-01A unit (MECC CO, Japan). Bioactive coating was applied by sequential incubation of VGs in solutions of bovine serum albumin, heparin and platelet lysate with fixation in a glutaric aldehyde solution. The surface structure and mechanical properties of the samples were investigated. Functional properties of the bioactive VGs were evaluated in relation to their interaction with cell cultures in vitro.Results. It was found that introduction of gelatin into the working solution reduces SP from 30.4 ± 1.5 mL/(cm2 ·min) to 2.8 ± 0.5 ml/(cm2 ·min). It was shown that at a PCL/gelatin ratio of 9 : 1, the outer and inner sides of the bioactive VGs samples are characterized by surface uniformity (no defects), mechanical properties close to blood vessels of the same diameter (Young’s modulus 6.7 ± 2.1 MPa, tensile strength 26.7 ± 4.9 N and elongation to break 423 ± 80%) and ability to support adhesion and proliferation of human umbilical vein endothelial cell line, EA.hy926.Conclusion. Introduction of 10% gelatin content (by the polymer weight) into PCL solution reduces the SP of small-diameter VGs, leads to uniformity in their inner and outer surface, improvement in their mechanical properties without reducing their ability to support adhesion and proliferation of vascular endothelial cells.
Equivalents of the neutrophil-to-lymphocyte ratio of circulating pool of stem and immature hematopoietic cells for assessing liver transplant status
Authors: Shutko A. N. , Gerasimova O. A. , Marchenko N. V. , Tileubergenov I. I. 
Published: September 2023

Objective: to study the applicability of the neutrophil-to-lymphocyte ratio (NLR) for monitoring recipient status and for possible minimization of maintenance immunosuppression in the long-term period after liver transplantation (LT).Materials and methods. Blood samples of 19 recipients with satisfactory graft function were examined by flow cytofluorometry at various time periods after LT using hematopoietic stem cell markers CD133, their CD31 derivatives, and alpha-fetoprotein (AFP), compared with the conventional NLR.Results. The use of NLR equivalents with CD133 and CD31 to assess liver transplant status is due to their high representation in liver tissue. Their values change in the long-term posttransplant period (from 1.5 to 6–7 years following LT) ≈20-fold and in different directions, but only when measuring their commissural to the liver cell fractions bearing the AFP marker.Conclusion. In contrast to the conventional NLR, maintenance of the lowest level of CD31 AFP, an NLR «equivalent», achieved at 1.5 years after LT, can be considered a criterion for the success of immunosuppressive therapy in the long-term post-LT period. The developed technique can be used to decide on whether to reduce or discontinue medication-assisted prophylaxis of graft rejection.
Guerrillas and Combative Mothers: Women and the Armed Struggle in South Africa
Authors: Garman Anthea 
Published: September 2023

Siphokazi Magadla's Guerrillas and Combative Mothers rests on 40 life histories of women who joined armed struggles of many kinds to fight apartheid. The book is a result of her doctorate which in turn rests on work she did while being a research consultant at the Institute for Security Studies. In 2010, on the tenth anniversary of the United Nations' (UN's) adoption of Resolution 1325, Magadla and Chery Hendricks produced the documentary Women and Security Sector Transformation in South Africa (2010). Magadla interviewed Major General Ntsiki Memela-Motumi, then chief director of transformation management in the South African National Defence Force (SANDF); Thandi Modise, a previous chair of the Portfolio Committee on Defence in the National Assembly and; Mala Singh, former deputy national commissioner of the South African Police Service (SAPS). Memela-Motumi and Modise are both former combatants in Umkhonto weSizwe (MK). They provided rich accounts of how their experiences as women in MK informed their later roles in transforming the SANDF. However, the study also has a prior genesis in Magadla's own experience of being the daughter of a soldier in the Transkei Defence Force. He ended his military career at 40 after that force was integrated into the SANDF. Her mother, a psychiatric nurse, also made her aware of the unstable mental conditions of many soldiers who were demobilised from the various armed forces in the period around 1994. This personal knowledge plus the experience of working with the Institute for Security Studies (ISS) gives the impetus for an important study. It is a study arising out of the complicated and turbulent moment in time when seven armies were integrated. These seven armies include the South African Defence Force (SADF), MK, the Azanian People's Liberation Army (APLA) and the four 'homeland' armies. This was a period in which those who had chosen to fight apartheid were faced with the question of whether they were career soldiers or not; and whether a return to civilian life was possible now that there was no longer a war.
Development, reliability, and validity of a diagnostic algorithm for sarcopenic dysphagia
Authors: Mori Takashi , Fujishima Ichiro , Wakabayashi Hidetaka , Oshima Fumiko , Itoda Masataka , Kunieda Kenjiro , Kayashita Jun , Nishioka Shinta , Sonoda Akiko , Kuroda Yoshitoshi , Yamada Minoru , Ogawa Sumito 
Published: September 2023

AbstractBackgroundSarcopenic dysphagia is characterized by difficulty swallowing due to loss of whole‐body skeletal and swallowing muscle mass and function. Despite multiple reports regarding sarcopenic dysphagia, no verified diagnostic methods exist. The purpose of this study was to develop a diagnostic algorithm for sarcopenic dysphagia and verify its reliability and validity.MethodsFirst, our research group, the Working Group on Sarcopenic Dysphagia, developed a diagnostic algorithm for sarcopenic dysphagia. Patients 65 years and older who could follow commands were eligible for assessment using the algorithm. Patients without whole‐body sarcopenia, with normal swallowing function, and with a disease that was an obvious cause of their dysphagia were considered not to have sarcopenic dysphagia. Then, swallowing muscle strength was assessed by tongue pressure. Those with poor swallowing muscle strength were deemed to be at probable risk for sarcopenic dysphagia and those with normal swallowing muscle strength to be at possible risk for sarcopenic dysphagia. Second, we applied the algorithm to inpatients 65 years and older and investigated their characteristics, muscle mass, muscle strength, motor function, swallowing muscle strength, swallowing function, and nutritional status. We investigated the reliability of the algorithm by analyzing intra‐ and inter‐class correlation coefficients using kappa statistics. Third, we investigated the validity of the algorithm by analyzing the difference in the proportion of patients with sarcopenic dysphagia between the no malnutrition and malnutrition groups and investigated the risk factors for sarcopenic dysphagia using logistic regression analysis.ResultsA total of 119 patients participated in this study. Their mean age was 86.1 years, and 55 (46%) were men. Among the 119 patients, 32 were categorized as having possible sarcopenic dysphagia, 18 probable sarcopenic dysphagia, and 69 no sarcopenic dysphagia. The intra‐class coefficient for the algorithm was 0.87 (95% confidence interval [CI]: 0.73‐1.01), and the inter‐class coefficient was 0.98 (95% CI: 0.92‐1.02), indicating high intra‐ and inter‐rater reliabilities. In the investigation of the algorithm's validity, 67 patients were analyzed. The proportion of patients with sarcopenic dysphagia was significantly higher in the malnutrition than in the no malnutrition group (P = 0.028). Malnutrition and age were independently associated with sarcopenic dysphagia (P = 0.013 and 0.003, respectively).ConclusionsA diagnostic algorithm for sarcopenic dysphagia was developed, and its reliability and validity were verified. All older patients with sarcopenia or dysphagia should be assessed for sarcopenic dysphagia, which requires treatment involving not only rehabilitation for dysphagia but also nutritional improvement.
El desarrollo del componente léxico-semántico en escolares con discapacidad intelectual
Authors: Ledesma Mayea Julio Cesar , Pérez Rodríguez Lismay 
Published: September 2023

La presente investigación titulada El desarollo del componente léxico-semántico en escolares con discapacidad intelectual, responde a la necesidad de fundamentar las bases anatomofisiológicas del retraso secundario del lenguaje como parten de los criterios y enfoques de diferentes autores con respecto al desarrollo del retraso secundario del lenguaje específicamente en escolares con diagnóstico de discapacidad intelectual, que tienen una edad de lenguaje inferior a su edad mental donde los aspectos que más condicionan el nivel de perturbación del lenguaje de estos son las dificultades en la conceptualización y en el descubrimiento de las estructuras lingüísticas. Con la aplicación de diferentes métodos de nivel teórico y empírico, permitió constatar que los escolares objeto de estudio presenta marcadas dificultades en el desarrollo del componente léxico-semántico, caracterizado por limitaciones en el empleo de sustantivos, adjetivos y verbos, que afectan el lenguaje impresivo y expresivo. Para dar respuesta a estas necesidades se propone una multimedia educativa conformada por módulos, según diferentes ejes temáticos, estos se componen de videos didácticos organizados en forma creciente de dificultad y complementados por láminas, fotografías, canciones juegos y ejercicios que permiten el refuerzo y la sistematización de los objetivos propuestos. Por lo que se declara como el objetivo general: proponer una multimedia educativa que contribuya al desarrollo del componente léxico-semántico en escolares con retraso secundario del lenguaje asociado a una discapacidadintelectual.
Palabras clave: discapacidad intelectual, léxico, semántico, sistema multimedia
Refuerzo Positivo para Afrontar la Separación de Pareja: Estudio de Caso, Chiclayo 2021
Authors: Fernández Díaz Edulgerio 
Published: September 2023

Objetivo: Determinar los efectos del refuerzo positivo en el afrontamiento de la separación de pareja: Estudio de caso, Chiclayo 2021. Método: Se realizó una investigación experimental, con un diseño tipo caso único intrasujeto; Se utilizaron reforzadores positivos con el fin de cambiar permanentemente las conductas negativas generadas por el maltrato psicológico y la separación de la pareja. Para conocer las estrategias de afrontamiento utilizadas por los pacientes se utilizó el Inventario de Estrategias de Afrontamiento (CSI), el cual se aplicó como pretest y postest. Resultados: Se observó que la evaluada utiliza con mayor frecuencia la estrategia de expresión emocional con un percentil de 85, lo que significa que centra su atención en sus emociones, las cuales la desbordan y no le permiten centrar su atención en la reestructuración cognitiva para resolver sus problemas. Tras la aplicación del programa a través de reforzadores positivos como extinción de conductas aversivas, recompensa social, autoimagen y autoconcepto positivos, diálogo con familiares y amigos, interacción social, retroalimentación informativa y cambios estratégicos de pensamiento y acción, se ha posible avanzar de manera significativa, en la medida en que la atención se ha centrado en la solución del problema. Conclusiones: Se ha logrado empoderar a la paciente en la medida en que ha dejado de criticarse y verse como una mujer con poder y con ganas de hacerse cargo de sí misma; la dependencia emocional y económica ha dejado de ser una constante; la evasión de problemas la ha transformado en potencialidades afectivas, maternas y laborales: mentalmente se siente fortalecida al poder enfrentarse a su expareja para dialogar y decidir sobre el futuro de los hijos; ha llegado a concebir que la autorrealización depende de ella y que ser feliz no es una idea, sino una decisión personal.
Palabras clave: Estrategias de Afrontamiento, Refuerzo Positivo, Separación de Pareja, Intra-sujeto, Experimento