INVESTIGATION OF MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF TUBING WITH FERRITO-PERLITE STRUCTURE

Проведены исследования механических свойств и стойкости к углекислотной коррозии образцов насосно-компрессорных труб из стали 35ХГФ с феррито-перлитной структурой. Определены границы применения стали с феррито-перлитной структурой в зависимости от агрессивности среды.The carried out researches of mechanical properties and resistance to carbon dioxide corrosion of samples of tubing from steel with ferrite-pearlitic mine. The boundaries of the use of steel with a ferrite-pearlite operation are determined depending on the aggressiveness of the medium

Pulmonary embolism and atrial fibrillation: analysis of data from the SIRENA Russian registry

Aim. To present the clinical characteristics and in-hospital prognosis in patients with pulmonary embolism (PE) and atrial fibrillation (AF).Material and methods. On the initiative of a working group of physicians, the basic principles of an observational prospective study (SIRENA registry) have been developed.Results. Among the 660 patients included in the registry, AF was diagnosed in almost every fourth patient — in 22,9% of cases (n=151), which reflects its high incidence in relation to PE. The prevalence of AF corresponded to such conditions as heart failure (HF) (23,2%; n=153), diabetes (15,6%; n=103), and hypertension (HTN) (65,7% n=400). The diagnosis of AF in most patients is based on the history data (n=144; 95,4%), while the first registered AF episode was verified in 7 patients (4,6%). Patients with AF were characterized by older age, significantly higher prevalence of HF (51,2%), HTN (80,8%), chronic kidney disease (18,5%), stroke or transient ischemic attack (23,2%). It is important to note the low prevalence of anticoagulant therapy (15,3%) in the group of patients with previously diagnosed AF (n=144). The prevalence of thrombolytic therapy in patients with AF was significantly lower than among patients without AF (13,9 vs 25,8% (p=0,026)), which is due to contraindications and underdiagnosis of PE. Given the predominantly senile age, high comorbidity rate in patients with AF, as well as the absence of outpatient anticoagulant therapy, in-hospital mortality in patients with PE and AF was 31,1%, and significantly differed from that in those without AF 12,6% (p=0,001). In the general group, post-mortem diagnosis of PE was noted in 7,7% of cases (n=51), of which the proportion of patients with AF was 54,9% (n=28). A possible explanation for the underestimation of PE in AF patients was an erroneous explanation of its manifestations (tachypnea, tachycardia, lower limb edema) due to concomitant HF.Conclusion. Suspicion for PE in elderly patients with AF and manifestations of HF decompensation, as well as the timely administration of anticoagulant therapy, will prevent both arterial and venous embolism

Взаимосвязь маркеров эндотелиальной дисфункции при гнойном холангите у больных с хроническим гепатитом и без хронического гепатита на фоне обтурационной желтухи

Цель. Изучение взаимосвязи маркеров эндотелиальной дисфункции при гнойном холангите у больных с хроническим гепатитом и без хронического гепатита на фоне обтурационной желтухи, выявление его раннего перехода в цирроз печени и оптимизация тактики лечения в до- и послеоперационном периоде с оценкой показателей исследуемых лабораторных тестов. Материалы и методы. Исследование проведено в отношении 15 больных с гнойным холангитом, из них у 9 больных был хронический гепатит, у 6 больных хронического гепатита не было. Из 9 больных с хроническим гепатитом 4 больным противовирусную терапию не проводили, 5 - проводили. Результаты. Непосредственные результаты проведенного лечебно-диагностического исследования свидетельствуют о сходных проявлениях эндотелиальной дисфункции при гнойном холангите у больных с хроническим гепатитом и без хронического гепатита. Всем больным с гнойным холангитом выполняли декомпрессию желчных протоков, устраняли причины обтурации, проводили дезинтоксикационную терапию. По данным корреляционного анализа показателей функционального состояния эндотелия у больных с хроническим гепатитом, получавших противовирусную терапию, улучшение отметили на 10-е сут, через 1 мес оно было более выраженным, чем у больных, не получавших противовирусную терапию. У 6 больных с гнойным холангитом без хронического гепатита своевременное хирургическое, дезинтоксикационное лечение совместно с озонотерапией привело к улучшению показателей функционального состояния эндотелия на 10-е сут, через 1 мес они приблизились к норме. Выводы. Своевременное выявление эндотелиальной дисфункции при гнойном холангите у больных с хроническим гепатитом и без хронического гепатита способствует раннему прогнозированию его перехода в стадию цирроза печени и правильному выбору тактики лечения в до- и послеоперационном периоде. Подытожив полученные данные, можно сделать вывод о том, что при гнойном холангите у больных с хроническим гепатитом целесообразно проведение противовирусной терапии до и после операции

Comprehensive approach in treatment of locally disseminated oropharyngeal cancer

The article contains information about current trends of treatment of the locally advanced oropharynx cancer. We analyzed the results of chemoradiation treatment, and surgery treatment of patients with rudimentary tumors after the chemoradiation therapy, taking into account the tumor margin, which gives capacity to perform an adequate operation with good oncological results

Prevention of Cardioembolic Complications in Patients with Atrial Fibrillation: Efficacy and Safety of Left Atrial Appendage Isolation and Oral Anticoagulants

Aim. To study the outcomes frequency and structure in patients with atrial fibrillation (AF) depending on the cardioembolic events preventing method: left atrial appendage (LAA) isolation, direct oral anticoagulants (DOACs) or warfarin.Material and methods. A prospective observational study included patients with AF and high risk of cardioembolic complications and without contraindications to anticoagulants. Patients who refused long-term oral anticoagulants taking underwent LAA isolation, the rest of the patients received DOACs or warfarin. The observation period was 3 years. Mortality, cardioembolic complications and major bleeding (according to GARFIELD criteria) cumulative incidence was assessed.Results. We included 245 patients: 46 patients were treated with LAA isolation, 100 with warfarin, and 99 with DOACs. Multivariate regression analysis demonstrated a statistically significant advantage of LAA occluder in terms of combined endpoint achieving frequency compared to warfarin (hazard ratio [HR] 3.10; 95% confidence interval [CI] 1.01-9.54; p=0.049), and to DOACs (HR 3.44, 95% CI 1.15-10.29; p=0.027). A similar result was obtained for all-cause mortality (HR 5.24; 95% CI 1.12-24.55; p=0.036 and HR 5.58; 95% CI 1.22-25.49; p=0.027, respectively). There were no significant differences in bleeding rates between the groups.Conclusion. This observational study demonstrates the superiority of LAA isolation as a first-line therapy over DOACs and warfarin in patients with AF and high risk of cardioembolic complications. Randomized trials are required to confirm these observations

Integrated solution for very high cardiovascular risk patients. Rationale and design of a pilot study

Coronary artery disease (CAD) is the most common cardiovascular disease and the leading cause of morbidity and mortality. Acute coronary syndrome (ACS) as an abrupt destabilization of CAD, multiplies the risk of cardiovascular events. To reduce the incidence of recurrent cardiovascular events, timely tackling potentially reversible risk factors such as hypertension and/or hyperglycemia is imperative. However, a solid basis for a secondary prevention lies in the treatment of dyslipidemia and begins in the first hours of hospital admission. Despite considerable evidence regarding the efficacy and safety of lipid-lowering therapy, averagely only one third of patients maintain control of lipids. The main challenges are low adherence, poor continuity of medical care, and the lack of an ambulatory routine follow-up. Telehealth solutions are believed to address these barriers and may be considered as an add-on to in-person patient care. Telemonitoring of vital and laboratory parameters, remote patient counseling can be introduced into routine care delivery. Telemedicine shows promise for fostering better clinical effect, and provides health-related quality of life improvement.It is planned to conduct a pilot observational study aimed to create and to test an integrated solution, i.e. telemonitoring and remote counseling in patients of very high cardiovascular risk with ACS followed by myocardial revascularization. The goal is to determine the clinical effectiveness, i.e achievement of target values of blood pressure, lipid profile and glycemia, and patient-centeredness of this approach

Integrated solution for patients of a very high cardiovascular risk. Final results

Secondary prevention should be actively implemented at all stages of treatment and rehabilitation of patients after acute coronary syndrome (ACS). The integration of remote monitoring of patients with the transfer of vital and laboratory data into clinical practice seems promising.Aim. To evaluate the clinical and patient-centered effectiveness of the original 12-month combined face-to-face and telecare program in patients with recent ACS.Material and methods. For the present analysis the data from 84 (out of 100) patients (median age, 56 (50;61) years, 70 males) was used. These patients had to have hypertension and/or type 2 diabetes and an ACS with percutaneous revascularization within 12 months. Their low-density lipoprotein cholesterol (LDL-C) had to be above 2,4 mmol/L. Telehealth program supplemented routine care. A program contained electronic self-control diaries for blood pressure (BP) and lipid profile, and teleconsulting service (text chat). Mandatory face-to-face visits were carried out at 3 and 12 months after the enrollment. The primary end point was ∆LDL-C. Additional clinical and patient-specific endpoints were evaluated.Results. At the 12-month visit, there was a significant decrease in LDL-C by 1,6 (-2,3;-0,9) mmol/L. Besides the initial LDL-C value, the decrease in LDL-C was associated with the proper adherence to keeping diaries of BP and lipid profile (β=0,7), and the number of text messages sent by the doctor in the 1st month after the enrollment (β=0,04). In more adherent patients, the ∆LDL-C was greater by 0,49 mmol/L (95% CI (-1,2; -0,1)) after adjustment for abovementioned covariates. In 35 patients (42%), target LDL-C was achieved, in 60 patients (71%) — a decrease ≥1 mmol/l. Other lipids also have changed for the better. Moreover, adherent patients were twice as likely to achieve the target LDL-C (OR 2,2; 95% CI (0,6; 3,8)) than non-adherent ones. A decrease in office systolic BP by 5,8 mm Hg was shown (p=0,03). The number of physician-to-patient messages exceeded those from patients to physician (median 143 and 111 per patient for 12 months, respectively). The quality of life has improved, but only in terms of emotions. Satisfaction with the program remained high at all timepoints of the study.Conclusion. Our study showed the effectiveness of the integrated care in ACS patients with the telehealth tool included. Commitment to BP self-monitoring, as well as active consultative support at the first stages of rehabilitation, contributes to additional dynamic control of lipid profile, timely correction of lipid-lowering therapy with the achievement of the target LDL-C level. Most of the patients did not experience any difficulties in using the program and are ready to recommend integrated approach to other peers

Computational optical sensing and imaging 2021: feature issue introduction

This Feature Issue includes 2 reviews and 34 research articles that highlight recent works in the field of Computational Optical Sensing and Imaging. Many of the works were presented at the 2021 OSA Topical Meeting on Computational Optical Sensing and Imaging, held virtually from July 19 to July 23, 2021. Articles in the feature issue cover a broad scope of computational imaging topics, such as microscopy, 3D imaging, phase retrieval, non-line-of-sight imaging, imaging through scattering media, ghost imaging, compressed sensing, and applications with new types of sensors. Deep learning approaches for computational imaging and sensing are also a focus of this feature issue

Differential diagnosis of myopathy and multiple epiphysal dysplasia caused by mutations in the <i>COMP</i> gene in children

Background. Multiple epiphysal dysplasia (MED) type 1 (OMIM: 132400) is one of 7 genetic variants of this group of skeletal dysplasias described to date. The disease is caused by mutations in the COMP gene located on chromosome 19p13.1. The presence of muscle hypotonia and ligamentous laxity, as well as a moderate increase in the level of creatinephosphokinase activity, can lead to misdiagnosis of myopathy.Objective: to analyze the clinical and genetic characteristics of type 1 MED caused by mutations in the COMP gene in a series of Russian patients. Differential diagnosis was focused on the distinctive features of the disorder and hereditary myopathies.Materials and methods. We observed 8 patients from 7 families aged 7 to 15 years with MED type 1 caused by heterozygous mutations in the COMP gene. To confirm the diagnosis, the following methods were used: genealogical analysis, clinical examination, neurological examination with psycho-emotional testing, radiography and targeted sequencing of a panel consisting of 166 genes responsible for the development of inherited skeletal pathology.Results. Case history, clinical, radiological and genetic characteristics of 8 patients with MED type 1 caused by mutations in the COMP gene were analyzed. The first clinical manifestations of the disease were recorded from the age of 2–3 years and were characterized by gait disturbances, muscle weakness, difficulties with climbing stairs, frequent falls when walking, the inability to get up from the floor and from a squatting position and hypermobility of the joints. Electroneuromyographic study did not reveal the signs of miopathy. In two patients, a moderate increase in the creatinekinase level of up to 250–360 u / l was found. All patients were surveyed by neurologists for several years with a clinical diagnosis of congenital myopathy. At the age of 5–6 years patients COMPlained knee and ankle pain, which was assumed as rheumatic arthropathy. X-ray examination revealed typical signs of deficient ossification of the epiphyses. The next-generation sequencing analysis revealed seven single nucleotide variants in the COMP gene that lead to MED type 1. Three of the found variants here identified for the first time. As previously described, the majority of nucleotide variants (six out of seven) were localized in the 8–14 exons of the COMP gene and led to amino acid substitutions in calmodulin-like protein domain repeats, and only one substitution was localized in the C-terminal region of the protein molecule.Conclusion. In most patients with MED caused by mutations in the COMP gene, the first symptoms of the disease are gait disturbance, muscle weakness, and Gowers» maneuvers. The presence of these symptoms, along with a moderate increase in the level of creatinephosphokinase activity, often precedes the onset of clinical manifestations of skeletal dysplasia, leading to a misdiagnosis with myopathies. Accession of expressive arthralgias to these symptoms was mistakenly identified as reactive arthritis. X-ray examination of patients’ long bones helps to suspect the presence of MED. This X-ray imaging shows specific signs of epiphyses damage. A molecular-genetic analysis needs to be done to diagnose the genetic variant, caused by mutations in gene COMP

The Structure and Properties of High-Chromium Steels Grade X8013Cr, Resistant to Carbon Dioxide Corrosion

Laboratory smelting of experimental grades of steel of type 13Cr with various contents of nickel, molybdenum and niobium was carried out. The rational chemical composition of the steel and the heat treatment mode were selected, which ensure obtaining mechanical properties corresponding to the strength group X80 13Cr.Проведена лабораторная выплавка экспериментальных марок стали типа 13Cr с различным содержанием никеля, молибдена и ниобия. Выбраны рациональный химический состав стали и режим термической обработки, обеспечивающие получение механических свойств, соответствующих группе прочности X80 13Cr