Short Wavelength Analysis of the Evolution of Perturbations in a Two-component Cosmological Fluid

The equations describing a two-component cosmological fluid with linearized density perturbations are investigated in the small wavelength or large $k$ limit. The equations are formulated to include a baryonic component, as well as either a hot dark matter (HDM) or cold dark matter (CDM) component. Previous work done on such a system in static spacetime is extended to reveal some interesting physical properties, such as the Jeans wavenumber of the mixture, and resonant mode amplitudes. A WKB technique is then developed to study the expanding universe equations in detail, and to see whether such physical properties are also of relevance in this more realistic scenario. The Jeans wavenumber of the mixture is re-interpreted for the case of an expanding background spacetime. The various modes are obtained to leading order, and the amplitudes of the modes are examined in detail to compare to the resonances observed in the static spacetime results. It is found that some conclusions made in the literature about static spacetime results cannot be carried over to an expanding cosmology.Comment: 42 pages, 12 figure

Clinical case of hereditary hemochromatosis

The article presents a clinical case demonstrating the difficulties of timely diagnosis of hereditary hemochromatosis, presents data on modern diagnosis and approaches to the treatment of the disease according to existing clinical guidelines. The described clinical case of hereditary hemochromatosis is associated with a homozygous mutation of C282Y in HFE gene in a 58-year-old patient and his twin brother. Initially, signs of iron deposition in the liver were found on MRI of the abdominal cavity. In laboratory analyses, the patient was found to have an increased level of serum iron - 40 µmol/l and ferritin - 1340 ng/ml. Subsequently, the investigation of HFE gene mutations was carried out and a mutation of C282Y in homozygous form (genotype A/A) was found, which is a molecular genetic confirmation of hereditary hemochromatosis of type 1. At the same time, the patient's twin brother at the targeted examination had the serum iron level of 36 µmol/l, the ferritin level of 600 ng/ml, and also the mutation of HFE gene, the allelic variant of A/A. The results of liver fibroelastometry of the patient correlate with the degree of fibrosis F1 by Metavir scale. Timely started therapeutic phlebotomies led to improved clinical and laboratory parameters of iron metabolism while maintaining normal levels of red blood cells and hemoglobin

НЕПРОНИКАЮЩАЯ ГЛУБОКАЯ СКЛЕРЭКТОМИЯ И ИМПЛАНТАЦИЯ ДРЕНАЖА EX-PRESS R-50 В ХИРУРГИЧЕСКОМ ЛЕЧЕНИИ ГЛАУКОМЫ

PURPOSE: Analysis of the mediumand long-term results of the mini-shunt Ex-Press implantation in glaucoma surgical treatment.METHODS: Non-penetrating deep sclerectomy with the mini-shunt Ex-PRESS R-50 implantation was performed in 198 eyes of 177 patients with uncontrolled and/or refractory glaucoma between 2011 and 2014. Exclusion criteria for patients: signs of neovascularisation, close-angle or congenital glaucoma, previous ophthalmologic surgeries during the last 6 months, the need for simultaneous combined cataract and glaucoma surgery. The study included 161 patients (176 eyes). A review of the patients’ anamnesis revealed a history of previous glaucoma surgical procedures in 126 (77.6%) patients, cataract phacoemulsification with IOL implantation in 108 (67%) patients and vitrectomy in 43 (26.7%) cases. All surgical interventions were undertaken within a period of more than 6 months before the present study. A standard ophthalmologic examination was performed in all patients prior to surgery and on days 1 and 7, as well as 1, 2, 3, 6, 12, 18, 24 and 36 months after the drainage implantation. In a number of patients, examinations were also performed 48 (n=44, 27.3%) and 60 (n=21, 13%) months after the operation. In addition, patients were divided into group I («phakic» glaucoma, n=53; 32.9%) and group II (pseudophakic glaucoma, n=108; 78.3%)RESULTS: The mean follow-up period was 43.7±2.9 months. The mean age of patients at the time of surgery was 72.4 ± 9.6 years, with 63 (39.1%) male and 98 (60.9%) female patients. IOP decrease compared to preoperative values of 32.3±8.7 mmHg amounted to 6.2±7.7 mm Hg after 1 week, 11.9±5.8 mm Hg after 1 month, 12.5±4.0 mm Hg after 2 months, 12.7±4.8 mm Hg after 3 months, 12.1±4.5 mm Hg after 6 months, 11.7±4.2 mm Hg after 12 months, 12.9±5.1 mm Hg 18 months after surgery. At the follow-up period of 24 months, the IOP decreased to 15.3±6.6 mm Hg, and at follow-ups of 36 months to 17.5±6.8 mm Hg (45.8%). In 44 (27.3%) patients 48 months later, the IOP level exceeded the compensation level with average values of 22.4±8.0 mm Hg. In 60 months after the operation 21 (13%) patients had a mean IOP level of 26.1±8.2 mm Hg. A statistically insignificant change in BCVA from 0.61±0.25 in the preoperative period to 0.57±0.31 during the last examination was observed (p>0.1). There was a significant decrease in the number of glaucoma instillations with the average numbers of 0.55±1.1 and 0.89±1.2 24 and 36 months after the surgery respectively, compared to 2.7±0.9 prior to the surgery (p=0.002 and p=0.01). In all the investigated cases, a daily massage of the filtration zone was performed during the postoperative period. In 94 (58.4%) patients, the IAG laser procedure was performed on the shunt at various postoperative times. Postoperative complications included a transient hypotension in the early (10-14 days) postoperative period, Seidel’s symptom and bleb encapsulation, which required additional intervention. At the maximum follow-up period of 36 months, somewhat better results were obtained in group II (mean IOP 15.9±4.2 mm Hg vs. 17.3±4.4 mm Hg in group I, p>0.1). Similar differences were obtained for the number of glaucoma drugs taken (0.81±0.9 in group II against 0.97±1.1 in group I, p>0.1). Larger differences were obtained for BCVA during the long-term follow-up period (0.62±0.26 in group II versus 0.38±0.21 in group I, 0.05<p<0.1).CONCLUSION: Ex-PRESS mini-shunt implantation is indicated in patients with refractory glaucoma when with previous interventions and maximum antihypertention regimen proved insufficient to compensate intraocular pressure level. Relative simplicity of the implantation technique, a small percentage of complications and a high efficiency in the medium term observation period make it possible to recommend the use of this device for wide ophthalmic surgical practice. Optimal results are possible with the implantation of a mini-shunt under the superficial scleral flap and a special mode of postoperative management of the patient, which allows to maintain the functioning of the shunt and to provide a tolerant intraocular pressure. Implantation of the mini-shunt Ex-PRESS R-50 in patients with pseudophakia results in slightly better but statistically insignificant functional results, however, due to the reduction in the effect in long-term (up to 5 years) follow-up, this surgical intervention is not an operation of first choice for this group of patients.ЦЕЛЬ. Анализ среднеи долгосрочных результатов имплантации мини-шунта Ex-PRESS в лечении глаукомы.МЕТОДЫ. Непроникающая глубокая склерэктомия с имплантацией мини-шунта Ex-PRESS R-50 проведена на 198 глазах 177 пациентов с неконтролируемой и/или рефрактерной к медикаментозной терапии глаукомой в период с 2011 по 2014 гг. Критерии исключения пациентов: наличие неоваскулярной, закрытоугольной или врожденной глаукомы, предшествующие офтальмологические оперативные вмешательства в течение последних 6 месяцев, необходимость одномоментной комбинированной хирургии катаракты и глаукомы. В исследование включен 161 пациент (176 глаз). В анамнезе у 126 (77,6%) пациентов отмечено проведение других антиглаукомных хирургических вмешательств, у 108 (67%) пациентов была выполнена факоэмульсификация катаракты с имплантацией ИОЛ, 43 (26,7%) пациентам проведена витрэктомия, при этом все хирургические вмешательства были выполнены в сроки более 6 месяцев перед настоящим исследованием. Стандартное плановое офтальмологическое обследование всем пациентам выполняли до хирургического вмешательства и в сроки 1 день, 7 дней, 1, 2, 3, 6, 12, 18, 24 и 36 месяцев после имплантации дренажа. У части пациентов осмотры проводили также в 48 (n=44; 27,3%) и 60 (n=21; 13%) месяцев после операции. Дополнительно проведено разделение пациентов на группу 1 («факичная» глаукома; n=53; 32,9%) и группу 2 (артифакичная глаукома; n=108; 78,3%).РЕЗУЛЬТАТЫ. Средний период наблюдения составил 43,7±2,9 месяцев. Средний возраст пациентов на момент хирургического вмешательства 72,4±9,6 года, из них 63 (39,1%) мужчины и 98 (60,9%) женщин. Отмечено снижение внутриглазного давления (ВГД) по сравнению с дооперационными значениями 32,3±8,7 до 6,2±7,7 мм рт.ст. через 1 неделю, 11,9±5,8 мм рт.ст. через 1 месяц, 12,5±4,0 — через 2 месяца, 12,7±4,8 — через 3 месяца, 12,1±4,5 — через 6 месяцев, 11,7±4,2 — через 12 месяцев, 12,9±5,1 мм рт.ст. через 18 месяцев после хирургического вмешательства

ECHINOCOCCAL HYDATID ORBITAL CYST (CASE REPORT)

Orbital echinococcosis makes up less than 1% of the total incidence of hydatid diseases. Frequently a clinical presentation of orbital echinococcosis does not have typical signs. The article presents a case of detection of a hydatid echinococcosus orbital cyst with an absence of eosinophilia and negative results of serologic investigations for echinococcosus antigens. In case of difficulties in the diagnosis of echinococcosus cysts it is necessary to carry out an overall examination of the patient including an obligatory morphological investigation of the operative material

MOBILE H EALTH TECHNOLOGY: ORGANIZATIONAL, MEDICAL AND PHARMACOEPIDEMIOLOGICAL APPROACHES FOR CSD PREVENTION IN PRE-PRIMARY CARE

Objective: to evaluate the innovative organizational, medical and pharmacoepidemiological approaches for the prevention of circulatory system diseases in pre-primary care using mobile health technologies.Materials and methods: 3,694 people went through preventive consultation (questionnaires, anthropometry, body fat and blood pressure evaluation, electrocardiography, glucose and blood cholesterol) at equipped medical sites in shopping centers and rural health posts.Results. Among the surveyed, there were both healthy people and patients cardiovascular diseases and diabetes mellitus. Behavioral (insufficient consumption of fruits and vegetables, adding more salt without trying food, physical inactivity, smoking and alcohol abuse) and nutritional (obesity, hypertension, hypercholesterolemia and glycaemia) risk factors of chronic noncommunicable diseases were detected that contribute to high mortality from circulatory system diseases in the Tver region. This is associated with low adherence to drug therapy and its lack of efficacy in patients with hypertension, ischemic heart disease and cerebrovascular diseases.Conclusion: to assess the effectiveness of CSD prevention in pre-primary care, it is possible to use mobile medical sites in shopping centers and rural health posts