[Surgical safety cheklist at the management of the hybrid operating room].

An essential aspect of the work of the operating room is the provision of safety of both the patient and staff. The organization of the activity of the surgical service requires serious elaboration of each of its stage, as well as standardization in using various validated instruments. When speaking of a hybrid operating room with the use of intraoperative magnetic resonance tomography, such an approach becomes not merely a recommendation but rather forced and justified necessity. Simultaneous use of various technologies of imaging and treatment with the engagement of physicians of various specialties requires especially thorough control. A generally accepted international standard of the work of the operating block is the use of checklists, and since 2008 the initiative of the World Health Organization "Safe Surgery Saves Lives" has globally been working to promote implementation of the WHO Surgical Safety Checklists (SSCL) to the real clinical practice. The intraoperative MR-diagnostic stage dictates rigid requirements for proper inventory of ferromagnetic and nonmagnetic surgical tools, verified logistics, and routing of the patient in the conditions of high and extremely high (1.5-3.0 T) magnetic field. A separate and not less important problem is anaesthesiological support during MRT. In order to optimise the patient's movements and adequate monitoring of his/her safety inside the operating department, the authors have modified the standard WHO Surgical Safety Checklist. Implementation of the modified checklist for the MRT-equipped hybrid operating room should improve the control over the processes, as well as increase safety of both the patient and personnel.

Switching properties of ferromagnetic nanoparticles driven by a circularly polarized magnetic field.

We present a comprehensive study of the magnetization switching of a uniaxial nanoparticle driven by a circularly polarized magnetic field rotated in the plane perpendicular to the easy axis. The conditions for the existence of the uniform and non-uniform precessions of the nanoparticle magnetic moment are derived. In addition, the differences between switchings via uniform and non-uniform precession are determined, and the essential role of field polarization is demonstrated. The dependence of the switching time on the field amplitude and frequency are calculated numerically. We show that a permanent magnetic field can reduce the amplitude and frequency of the switching rotating field, and that the combined action of these fields is characterized by an extremely strong dependence of the switching time on the field parameters. We also demonstrate that the transition process caused by an external magnetic field pulse can decrease the switching amplitude in comparison with the value predicted from analysis of the stability criterion. We discuss the advantages of switching the magnetization by means of the action of a rotating field over the magnetization switching using a steady field applied perpendicular to the easy axis.

[Changes in the intraorganic blood vessels of the stomach and duodenum in peptic ulcer]. / Izmeneniia vnutriorgannykh krovenosnykh sosudov zheludka i dvenadtsatiperstnoi kishki pri iazvennoi bolezni.

It was established that the ulceration zones showed hyperemia which increases the volume density of venous vessels, disturbs the permeability of their walls, causes trophic disorders with subsequent phlebosclerosis, limitation of capacitance, appearance of venous hypertension and further changes of the vessel wall structures and neighbouring tissues. Compensatory reaction of the arterial intraorganic bed (vascular spasm) deteriorates trophic disorders. Simultaneous increase of the volume density of arterial vessels in the "intact" zone favours reparative and compensatory capacities of the latter. Repeat ulcer formation and chronic course of the disease furthers development of hemo- and microcirculatory disorders, progressing of angio- and perivascular sclerosis, reorganization of the intramural gastric and duodenal vascular bed.

[Morphogenetic problems of dilated cardiomyopathy]. / Nekotorye voprosy morfogeneza dilatatsionnyi kardiomiopatii.

A comprehensive histochemical, histoenzymatic, morphometric and ultrastructural evaluation of 27 autopsy and 22 biopsy specimens of the right ventricular endomyocardium, aimed at the study of dilatation cardiomyopathy, revealed alteration, compensatory and adaptation response in the cardiac muscle. The processes were recorded light-optically and ultrastructurally. Discussed are the mechanisms of the disease morphogenesis and ways of relevant therapeutic correction.

Isolation of lactic whey proteins in the form of complexes with apple pectin.

The possibility of isolating lactic whey proteins (LWP) in the form of insoluble complexes (IC) with apple pectin was studied. The effect of pH, ionic strength (mu, NaCl), temperature (T degree C), pectin weight fraction (X3%) and the total concentration of macromolecular components in the system (Ws) on isolation has been considered. The process has been characterized by LWP yield in the composition IC--P, percentage and the extent of protein concentration in the concentrated phase (IC)--F. The mixing of lactic whey with a pectin solution usually yielded an IC (10% less than or equal to X3 less than or equal to 90%). The dependence of P on X3 is of an extreme nature with a maximum of 85% at X3 = 60%. The following conditions correspond to the maximum LWP yield (90%) in the complex composition: pH 3.4, mu = 0.01, T = 5-20 degrees C, X3 = 60%, Ws = 0.5%. At compositions of the system corresponding to the maximum P value (X3 = 60%) practically all the LWP fractions are present in the concentrated phase. If X3 much greater than 60% or X3 much less than 60% alpha-lactalbumin is practically absent in the concentrated phase. Usually, minimum F values (2.5-4.0) correspond to maximum protein yield at X3 = 60%. At X3 greater than 70% and X3 less than 50% F values may be considerably higher (20 times and more). A decrease in the pectin methylation degree from 56.7% down to 15.4% does not affect F. The maximum protein yield (94%) occurs when low methylated pectin is used. The character of the dependence of F on X3 is explained according to similar processes of complex gel formation and the processes of gel formation in polymer solutions.