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1.
Probl Radiac Med Radiobiol ; 20: 104-26, 2015 Dec.
Artigo em Inglês, Ucraniano | MEDLINE | ID: mdl-26695896

RESUMO

Since 2007, the department of dosimetry of NRCRM has been working for to supply the Ukrainian State Register (SRU) of persons affected due to Chernobyl accident by exposure doses estimations. As of now, the individualization of doses has been performed for nine raions located in Kyiv, Zhytomyr, Rivne and Chernihiv oblasts. The structure of raion-specific models used for the reconstruction of individualized doses was described in detail in the previous 19-th issue of this journal (2014). The choice conditions for persons from the SRU using which for each raion there was formed a contingent of persons for whom the dose could be reconstructed. During the period of 2007-2015, the individualized dose was reconstructed for 244226 persons in 9 raions, representing ~ 58% of all registered in the SRU inhabitants of the raions. The calculation results were transferred to the SRU in formats adapted to the common database structure of the SRU. For each person who satisfied the conditions of selection there were estimated: (1) possible absorbed internal exposure dose of the thyroid by radioiodine in 1986 (assuming that the person in 1986 lived in the same village and was enlisted in the SRU); (2) annual doses of external, internal and total exposure of the whole body for a period of observation in the SRU; (3) total exposure dose of whole body accumulated during the period of observation in the SRU; (4) the total cumulative dose of feasible exposure during the period since 1986 till the decision to be registered in the SRU. There are presented the generalized results of the SRU subjects distribution for different raions in dependence on intervals of doses accumulated at different periods after the accident. The raion matrix tables show the dynamics of accumulation of doses by the SRU subjects both for their stay on the account and for the period of their possible residence registration in the settlement since 1986. The directions for further research to be implemented for increasing the number of persons for whom it is possible to calculate individualized dose have been formulated.

2.
Probl Radiac Med Radiobiol ; 19: 102-25, 2014 Sep.
Artigo em Inglês, Russo | MEDLINE | ID: mdl-25536551

RESUMO

Study objective. Development a system of models and procedures for the individualized internal exposure doses reconstruction for the subjects of Ukrainian State Register of persons, affected due to the Chornobyl accident (SRU) and residing in radioactive contaminated territories of Kozelets and Ripky raions of Chernihiv oblast. Materials and methods. A description the schematic diagram and mathematical equations of ecological-dosimetric models are given that allow to reconstruct the individualized exposure doses from consumption of food contaminated with radiocesium of Chornobyl origin for inhabitants of two raions of Chernihiv oblast. Parameterization of the reconstruction models is based on the mathematical analysis of results for radioecological (radiocesium milk contamination) and dosimetric (radiocesium human body burden) monitorings, that were calculated in the period of 1986-2012 in the settlements of raions under consideration. Due to quite low level of radioactive cesium depositions on the ground in 1986, the territory of these raions was divided into two "territorial zones": TZ-1, an area where the 137Cs ground depositions density in 1986 exceeds 37 kBq/m2, and TZ-2, an area where this rate does not exceeds 37 kBq/m2. For each territorial zone in each raion, the initial time moment (year) was introduced in the reconstruction model. Since this year the concept of the so-called "reference dose" has been using. Its value was assigned to all persons, regardless of the results and availability of monitoring. The results of radioecological and dosimetric monitorings were used for setting in raion specific functions: the annual average concentration of 137Cs in milk per unit of 137Cs ground depositions for Kozelets raion, function of the temporary dynamic of 137Cs concentration in milk for Ripky raion, absolute raion milk equivalent of the diet (ARMEr), and relative age dependent intake of radiocesium with the diet. Results and conclusions. Models for individualized internal exposure doses reconstruction were applied to 27811 SRU subjects from Kozelets raion and 14553 SRU subjects from Ripky raion. Results of doses individualization are given as annual average values of internal and summarized (internal and external) exposure doses for the period of 1987-2012, as well as the distribution of SRU subjects of different raions according to the intervals of accumulat-ed doses over the entire period of observation.

3.
Probl Radiac Med Radiobiol ; 19: 80-101, 2014 Sep.
Artigo em Inglês, Russo | MEDLINE | ID: mdl-25536550

RESUMO

Study objective. Dosimetric support of the Ukrainian State Register of persons, affected due to the Chornobyl accident (SRU). Development the system of models and procedures for the individualized internal doses reconstruction for the subjects of SRU residing in radioactive contaminated territories of Rokytne raion of Rivne oblast, Ovruch raion of Zhytomyr oblast and Ivankiv raion of Kyiv oblast. Materials and methods. A detailed description for the schematic diagram of the methodology and mathematical relations of ecological-dosimetric models are given. It allows to reconstruct the individualized doses from the ingestion of food contaminated by radiocesium after the Chornobyl accident for the subjects of SRU from three raions of Rivne, Zhytomyr and Kyiv oblasts. Phenomenologically, the developed models are close to the previously developed complex of ecological and dosimetric models intended to estimate the reference doses for the entire population of Ukraine. Calibration of model parameters is based on mathematical treatment for results of extensive radioecological (radiocesium milk contamination) and dosimetric (radiocesium burden in human body) monitorings, that were provided in the period of 1986-2012 in the settlements of raions under consideration. Completeness and periodicity of radioecological and dosimetric monitorings allowed to realize the settlement-specific approach for dose reconstruction, wherein for each settlement either the function of radiocesium intake with diet or the function of time-variation of radiocesium concentration in the local cow's milk were established. Absolute raion milk equivalent of the diet (ARMEr) and relative age dependent intake of radiocesium with diet are specified as a raion-specific functions for each raion. ARMEr is used to calculate the doses of adults in the settlement for which the function was specified. RRI is used to calculate the doses for the subjects of four children age groups (< 2 years old, 3-7 years old, 8-12 years old, 13-17 years old). Results and conclusions. Models for individualized internal exposure doses reconstruction of SRU subjects are developed. The individualized doses are estimated for 28711 SRU subjects from Rokytne raion, 18790 SRU subjects from Ivankiv raion and 41585 SRU subjects from Ovruch raion. Results of doses individualization are given as annual average doses for the period of 1987-2012. The distribution of SRU subjects of different raions over the intervals of doses accumulated over the entire observation period is also given. Values of total (from internal and external exposure) doses for SRU subjects of the raions under consideration are given, as well.

15.
Angiol Sosud Khir ; 17(1): 145-9, 2010.
Artigo em Russo | MEDLINE | ID: mdl-21780635

RESUMO

The authors share herein their experience in treating a total of two hundred and forty-six patients presenting with an ischaemic form of diabetic foot syndrome on the background of secondary to occlusion ofmajor arteries. The patients'average age amounted to 74 years. According to the findings of ultrasonographic angioscanning and radiopaque aorto- arteriography, 62.3 % of the patients were diagnosed as having bilateral lesions of the arterial bed and only 37.7 % of the patients had lesions of the major vessels on one side. Reconstructive operations on the aortoiliac-femoral zone were performed in sixty-nine (28 %) patients, distal reconstruction in one hundred and twenty-seven (52 %) patients, multi-storey reconstructions in eighteen (7 %), and prolundoplasty in thirty-two (13 %) patients. Direct revascularization of lower extremities made it possible to save the supporting foot in 89 % of the patients undergoing proximal reconstructions and in 83 % of the patients subjected to distal reconstructions, as well as to decrease the rate of high amputations to 11 %.


Assuntos
Prótese Vascular , Pé Diabético/cirurgia , Artéria Femoral/cirurgia , Artéria Ilíaca/cirurgia , Procedimentos de Cirurgia Plástica , Fatores Etários , Idoso , Pé Diabético/fisiopatologia , Feminino , Seguimentos , Humanos , Masculino , Síndrome , Resultado do Tratamento
16.
Khirurgiia (Mosk) ; (1): 49-52, 2009.
Artigo em Russo | MEDLINE | ID: mdl-19156077

RESUMO

Performong reconstructive operations on arteriae is the only way to avoid limb amputation in patients with critical limb ischemia. Whereas reconstructive manipulations on distal arteriae, especially in patients older then 75 years, are often entailed by thrombotic complications. High peripheric vessel resistance is considered to be the crucial factor of the bypass thrombosis. The conducted study demonstrated the efficacy of the use of vena saphena magna collateral tributaries as bypass unload collectors. Femoral distal autovenous in situ reconstruction decreases vessel resistance. Due to the arterial reconstruction with bypass unload using unligated autovenous tributaries the cumulative bypass patency was 75,1% a year after the procedure. 5-year cumulative bypass patency was 53,8%. 5 - year lethality was 28,6%.


Assuntos
Isquemia/cirurgia , Perna (Membro)/irrigação sanguínea , Procedimentos de Cirurgia Plástica/métodos , Procedimentos Cirúrgicos Vasculares/métodos , Fatores Etários , Idoso , Seguimentos , Humanos , Isquemia/diagnóstico , Estudos Retrospectivos , Fatores de Risco , Federação Russa/epidemiologia , Taxa de Sobrevida/tendências , Fatores de Tempo , Resultado do Tratamento
17.
Vestn Khir Im I I Grek ; 167(1): 14-7, 2008.
Artigo em Russo | MEDLINE | ID: mdl-18411660

RESUMO

The work was devoted to the problem of early and late thromboses of transplants at femoro-popliteal-tibial shunting. One of the main causes of frequent thromboses of the shunts was soundly shown to be high peripheral vascular resistance. The investigation has shown efficiency of using collaterals of the large subcutaneous vein as collectors of unloading the shunt in order to decrease the peripheral vascular resistance in femorodistal reconstruction with the autovein in the in situ position. In a year the cumulative passability of the shunt in the main group patients treated by the method of unloading the shunt with the help of non-ligated autovein collaterals made up 75.1% compared to 69.3% in patients of the group of comparison, and within 5 years 53.8% and 45.2% respectively. The index of safety of the extremity in a year was 81.5% in the main group patients, and 73.2% in control group patients, in 5 years 64% and 46.5% that demonstrated advantages of the method of leaving the functioning tributaries of the large subcutaneous vein intact after reconstruction.


Assuntos
Isquemia/fisiopatologia , Isquemia/cirurgia , Extremidade Inferior , Procedimentos Cirúrgicos Vasculares/instrumentação , Idoso , Idoso de 80 Anos ou mais , Anastomose Cirúrgica , Estado Terminal , Feminino , Veia Femoral/cirurgia , Humanos , Extremidade Inferior/irrigação sanguínea , Extremidade Inferior/fisiopatologia , Extremidade Inferior/cirurgia , Masculino , Microcirculação , Veia Poplítea/cirurgia
18.
Med Tekh ; (2): 5-10, 2007.
Artigo em Russo | MEDLINE | ID: mdl-17650640

RESUMO

Specific features of the process of short laser pulse propagation through a highly-dispersive biological medium are considered. Two models are used for the theoretical description of propagation of optical radiation through a highly-dispersive medium: diffusion approximation and non-stationary axial model. Physical characteristics of the dispersive medium are determined in both models. The obtained theoretical dependences are found to be in qualitative agreement with the results of experimental study.


Assuntos
Computação Matemática , Óptica e Fotônica , Espalhamento de Radiação , Tomografia Óptica , Modelos Teóricos
19.
Med Tekh ; (1): 4-9, 2007.
Artigo em Russo | MEDLINE | ID: mdl-17419338

RESUMO

The basic features of the process of development of medical optical introscopes are considered. Design characteristics of preproduction and production models of devices for diagnosis of the brain and the mammary gland are described.


Assuntos
Engenharia Biomédica , Encefalopatias/diagnóstico por imagem , Doenças Mamárias/diagnóstico por imagem , Lasers , Óptica e Fotônica/instrumentação , Humanos , Radiografia
20.
Khirurgiia (Mosk) ; (9): 46-8, 2006.
Artigo em Russo | MEDLINE | ID: mdl-17047633

RESUMO

The experience in surgical treatment of 1200 patients with an ischemic form of diabetic foot syndrome is analyzed. Surgical reconstruction of the major arteries was performed in 338 (28%) patients including reconstructive surgeries on the aorto-iliac-femoral segment--70 (21%), distal reconstructions--246 (73%), extra-anatomic reconstructions--22 (6%) patients. In distal reconstructions autovein in situ was used in 94, reversed autovein--in 82, and PTFE grafts--in 70 patients. Good results were achieved in 235 (69%), satisfactory--in 57 (17%) patients. Early thrombosis was revealed in 46 (14%) patients, femoral amputation was performed in 36 (10.6%) patients, 5 (1.4%) patients died.


Assuntos
Pé Diabético/cirurgia , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Resultado do Tratamento
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